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    Wyświetlanie 1-32 z 32
    Tytuł:
    Integration of advanced oxidation process with nanofiltration for dairy effluent treatment
    Autorzy:
    Stanisławek, E.
    Kowalik-Klimczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/115501.pdf
    Data publikacji:
    2017
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    advanced oxidation process
    dairy effluent treatment
    Fenton reaction
    nanofiltration
    zaawansowany proces utleniania
    oczyszczanie ścieków mlecznych
    reakcja Fentona
    nanofiltracja
    Opis:
    The paper presents the research results on the possibility of the integration of advanced oxidation process (AOP) involving Fenton reaction with nanofiltration (NF) for dairy effluent treatment. It has been found that Fenton oxidation reduces organic compounds, total phosphorus and total nitrogen. However, NF enables high ions retention derived from both effluent and Fenton oxidation components. As a result, it was possible to obtain water, which, without any harmful effects, could be discharged into environment. This water also fulfilled most of the requirements to be reused in dairy industrial plant.
    Źródło:
    Challenges of Modern Technology; 2017, 8, 2; 3-6
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced oxidation processes for food industrial wastewater decontamination
    Autorzy:
    Krzemińska, D.
    Neczaj, E.
    Borowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/123725.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    advanced oxidation process
    wastewater
    food industry
    Opis:
    High organic matter content is a basic problem in food industry wastewaters. Typically, the amount and composition of the effluent varies considerably. In the article four groups of advanced processes and their combination of food industry wastewater treatment have been reviewed: electrochemical oxidation (EC), Fenton’s process, ozonation of water and photocatalytic processes. All advanced oxidation processes (AOP`s) are characterized by a common chemical feature: the capability of exploiting high reactivity of HO radicals in driving oxidation processes which are suitable for achieving decolonization and odour reduction, and the complete mineralization or increase of bioavailability of recalcitrant organic pollutants.
    Źródło:
    Journal of Ecological Engineering; 2015, 16, 2; 61-71
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ zaawansowanego utleniania na toksyczność związków fenolowych
    Influence of advanced oxidation process on toxicity of phenolic compounds
    Autorzy:
    Olak-Kucharczyk, M.
    Ledakowicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073226.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    fenylofenole
    fotoliza
    pogłębione utlenianie
    toksyczność
    phenylphenols
    photolysis
    advanced oxidation
    system
    toxicity
    Opis:
    W pracy zaprezentowano wyniki badań rozkładu izomerów fenylolofenolu w środowisku wodnym w polu promieniowania UVC i w układzie H2O2/UVC. Szczególną uwagę poświęcono analizie toksyczności roztworów przed i po procesie degradacji. Zanik izomerów fenylofenolu zachodził zarówno przy zastosowaniu promieniowania UVC jak i w układzie H2O2/UVC. Wszystkie roztwory wodne izomerów fenylofenolu wykazywały działanie toksyczne w stosunku do bakterii E. coli. Naświetlanie mieszanin reakcyjnych promieniowaniem UVC nie spowodowało wyeliminowania ich toksyczności. Natomiast pogłębione utlenianie w układzie H2O2/UV przyczyniło się do uzyskania nietoksycznych roztworów poreakcyjnych.
    This work presents the experimental results of phenylphenol isomers degradation using UVC radiation and advanced oxidation processes in H2O2/UV system. An important step of this research was the toxicity determination of reaction mixtures before and after degradation processes. The highest PP isomers decay rate was obtained during advanced oxidation in H2O2/UV system. The aqueous solutions of all tested compounds exhibit toxicity against bacteria E. coli. UVC photolysis did not eliminate the toxicity of reaction solutions. While, in case of advanced oxidation in H2O2/UV system the non-toxic solutions were obtained.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2015, 4; 191--193
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Nitramine Explosives in Aqueous Solution by UV-Mediated Advanced Oxidation Process in Near-Neutral Conditions
    Autorzy:
    Khue, Do Ngoc
    Bach, Vu Quang
    Binh, Nguyen Thanh
    Minh, Do Binh
    Nam, Pham Thi
    Loi, Vu Duc
    Nguyen, Hoa Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/1838360.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    hexogen
    octogen
    tetryl
    UV
    photo-Fenton
    electrooxidation
    near neutral
    Opis:
    Explosive compounds are hazardous to the environment, posing a serious risk to human and animal health and the ecosystem. The primary goal of research was to compare the efficiency of UV/H2O2, photo-Fenton, electro (EO)/ UV/H2O2 processes at near-neutral pH (pH=6) on the degradation of nitramine explosives (NAs), such as hexogen (RDX), octogen (HMX), and tetryl (TET), in an aqueous solution. The effect of operational conditions, likely pH of the solution, initial H2O2 concentration, initial Fe2+ concentration, and solution temperature, was observed. The removal kinetics fit with first-order kinetics and were in the order: photo-Fenton >EO/UV/ H2O2 > UV/ H2O2. The results showed higher rate constant values for TET, RDX and HMX removal by UV/ H2O2 (k = 0.07778, 0.03791 and 0.03786 min-1), EO/UV/ H2O2 (k = 0.16599, 0.1475 and 0.08674 min-1) and photo-Fenton (k = 0.18018, 0.1501 and 0.09336 min-1) processes. Furthermore, TET, RDX and HMX were mineralized at 59.7%, 45.1%, and 25.1 %, respectively, under optimum conditions after 60 min of the photo-Fenton process. From the economic perspective, photo-Fenton only requires 2.132–4.113 kWh m-3 to completely reduce NAs. Finally, acute toxicity towards Vibrio fischeri was defeated after usage of near-neutral photo-Fenton. Thus, photo-Fenton at circum-neutral is promising for low-cost, eco-friendly and efficient processes for treating nitramine explosives in aqueous solutions.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 6; 232-243
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Nitramine Explosives in Aqueous Solution by UV-Mediated Advanced Oxidation Process in Near-Neutral Conditions
    Autorzy:
    Khue, Do Ngoc
    Bach, Vu Quang
    Binh, Nguyen Thanh
    Minh, Do Binh
    Nam, Pham Thi
    Loi, Vu Duc
    Nguyen, Hoa Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/1838333.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    hexogen
    octogen
    tetryl
    UV
    photo-Fenton
    electrooxidation
    near neutral
    Opis:
    Explosive compounds are hazardous to the environment, posing a serious risk to human and animal health and the ecosystem. The primary goal of research was to compare the efficiency of UV/H2O2, photo-Fenton, electro (EO)/ UV/H2O2 processes at near-neutral pH (pH=6) on the degradation of nitramine explosives (NAs), such as hexogen (RDX), octogen (HMX), and tetryl (TET), in an aqueous solution. The effect of operational conditions, likely pH of the solution, initial H2O2 concentration, initial Fe2+ concentration, and solution temperature, was observed. The removal kinetics fit with first-order kinetics and were in the order: photo-Fenton >EO/UV/ H2O2 > UV/ H2O2. The results showed higher rate constant values for TET, RDX and HMX removal by UV/ H2O2 (k = 0.07778, 0.03791 and 0.03786 min-1), EO/UV/ H2O2 (k = 0.16599, 0.1475 and 0.08674 min-1) and photo-Fenton (k = 0.18018, 0.1501 and 0.09336 min-1) processes. Furthermore, TET, RDX and HMX were mineralized at 59.7%, 45.1%, and 25.1 %, respectively, under optimum conditions after 60 min of the photo-Fenton process. From the economic perspective, photo-Fenton only requires 2.132–4.113 kWh m-3 to completely reduce NAs. Finally, acute toxicity towards Vibrio fischeri was defeated after usage of near-neutral photo-Fenton. Thus, photo-Fenton at circum-neutral is promising for low-cost, eco-friendly and efficient processes for treating nitramine explosives in aqueous solutions.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 6; 232-243
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Future vision of advanced oxidation process and its immediate efficacy-a deep, insightful comprehension and a far-reaching review
    Autorzy:
    Palit, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/971320.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    oxidation
    vision
    environment
    dye
    future
    introspection
    Opis:
    Environmental engineering is moving briskly and steadily from one challenging phase to another. The world of challenges are immense as well as far-reaching. Advanced oxidation processes today stands in the midst of immense scientific vision, scientific understanding and invincible scientific challenges. The effectivity of degradation quality of ozone and hydroxyl radicals is outstanding and path-breaking. Environmental concerns and subsequent environmental regulations are the burning issues of our present day civilization. Novel separation processes as well advanced oxidation techniques are the plausible solutions for zero-discharge norms and effective environmental engineering paradigm. The question of effective environmental engineering techniques comes into the horizon of a scientist’s mind. Amongst the advanced oxidation techniques, ozonation or ozone-oxidation stands today in the new millennium as the most effective environmental engineering techniques. Wastewater treatment and provision of clean drinking water are unquestionably the primordial issues of present day mankind and the ever-alert civil society. The visionary challenges are moving from one avenue of environmental disaster to another. Environmental disaster – both manmade as well as natural has plunged our civilization to unending catastrophe. These environmental calamities are harbingers of more immense and impending environmental disasters. The scientific paradigm and the scientific domain needs rethought and needs to be restructured. In the face of these immense environmental calamities, the thrust areas of novel separation processes and advanced oxidation needs immense retrospection. In such a critical juncture of history and time, this treatise effectively addresses the questions of zero-discharge norms with respect to new discoveries in the field of advanced oxidation processes particularly the field of ozonation.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 14, 2; 136-145
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation induced degradation of Congo red dye: a mechanistic study
    Autorzy:
    Muner, Majid
    Saeed, Muhammad
    Bhatti, Ijaz Ahmad
    Haq, Atta-ul
    Khosa, Muhammad Kaleem
    Jamal, Muhammad Asghar
    Ali, Saddaqat
    Powiązania:
    https://bibliotekanauki.pl/articles/146490.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Congo red
    radiolytic product
    irradiation
    advanced oxidation process
    Opis:
    Synthetic dyes are persistent pollutants with poor biodegradability. The present study is about the degradation of direct Congo red dye in aqueous media using the Co-60 gamma radiation source. The experimental conditions such as gamma-ray absorbed doses, amount of oxidant (H2O2) and pH conditions were evaluated. The lambda max of dye solution was noted as 498 nm, and then, decrease in absorbance and reduction in chemical oxygen demand (COD) were examined. The complete colour removal of dye was observed at 5 kGy, while a signifi cant COD removal was observed at 15 kGy gamma-ray absorbed dose in conjunction with oxidant for 50 mg/L concentration. It was found that pH has no influence on degradation efficiency. A possible degradation pathway was proposed. The radiolytic end products were monitored by Fourier transform infrared (FTIR) and gas chromatography coupled with mass spectrometry (GC-MS) to explore the degradation mechanism. It was imperative to study the oxidative degradation pathway to provide directions for potential applicability of advanced oxidation process (AOP) in industrial wastewater treatment.
    Źródło:
    Nukleonika; 2019, 64, 2; 49-53
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the central composite design to optimization of petroleum hydrocarbons removal from oilfield water using advanced oxidation process
    Autorzy:
    Farzadkia, M.
    Ghorbanian, M.
    Biglari, H.
    Gholami, M.
    Mehrizi, E. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/204881.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    advanced oxidation processes
    optimizing
    total oil hydrocarbons
    central composite design
    Opis:
    In the last few years, RSM method has been used widely to analyze, optimize and evaluate the interaction of independent factors for chemical, biochemical, and environmental processes. This study examined and evaluated the applicability of this method to manage Oilfield Produced Water to prevent marine environment due to the presence of hard degradable compounds by ozonation process. In this study simulated oil-water sample and a homogenizer reactor was used. The main reactor used in this study was impeinger equipped with sintered glass filter through which the treated oil-water was entered to reactor in the form of discontinuous flow. After ozonation and at the end of the reaction time (60 min), the concentration of oil hydrocarbons was determined by a gas chromatography device equipped with a flame ionization detector. The performance of the central composite design (CCD) approach was evaluated by the F-Value, P-Value, R2, lack of fit test and Adequate Precision parameters to determine the influence of effective factors, including ozonation time, pH, ozone dose, and TPH concentration on the TPH removal efficiency. The mean TPH efficiency obtained from the design of the 30-step experiment resulting from surface-response method was 49.903%, with a standard deviation of 12.47. This study showed the high power of model adopted from the central composite design to predict the hydrocarbons removal from oilfield water using advanced oxidation process, and it was proved that this model can be used alone to determine the design space nature.
    Źródło:
    Archives of Environmental Protection; 2018, 44, 4; 22-30
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Non-Thermal Plasma-Based Advanced Oxidation Process for Removal of Organic Contaminants In Azo Dyes Solution
    Autorzy:
    Kasih, T. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/123355.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    plasma-AOPs
    organic waste treatment
    submerged plasma channels
    dye decoloration
    Opis:
    The present study deals with the development of non-thermal plasma-based AOPs for removal of organic contaminants in wastewater treatment. The plasma itself is generated based on point-to-point geometry under organic solution and can generate hydroxyl radicals, ozone, peroxide and other radicals as the basic species to destruct organic contaminants. Electrical diagnostic in a form of voltage and current waveform was investigated through the variation of time during the formation of plasma channeling. The evolutions of plasma channeling with its physical phenomena were also discussed. The relationship between the electrodes distance towards applied voltage to sustain the plasma were also studied. It was found that the mineralization occurred during plasma treatment to transform the harmful functional group in organic dye solution into harmless species. Simultaneously, the decoloration process by using this submerged plasma treatment system is able to change the orange color of methyl orange solution into clearly transparent water in 30 minutes. The present findings may provide the plasma-based advanced oxidation process as a promising chemical-free and cost competitive AOP process application on specially the waste water treatment in textile industry.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 2; 1-6
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of advanced oxidation process (H2O2/UV) for removal of organic materials from pharmaceutical industry effluent
    Autorzy:
    Azizi, E.
    Fazlzadeh, M.
    Ghayebzadeh, M.
    Hemati, L.
    Beikmohammadi, M.
    Ghaffari, H. R.
    Zakeri, H. R.
    Sharafi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/207937.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    oksydacja
    ścieki farmaceutyczne
    substancje organiczne
    odpady farmaceutyczne
    ChzT
    bioreaktor
    amoxicillin
    UV/H2O2
    COD
    przemysł farmaceutyczny
    waste water
    membrane bioreactor
    UV/H2O2 process
    reactor
    mineralization
    pharmaceutical industry effluent
    Opis:
    Pharmaceutical wastewater is one of the major complex and toxic industrial effluents containing little or no biodegradable organic matters. In this study, H2O2/UV based advanced oxidation process (AOP) was used to remove organic materials from pharmaceutical industry effluent. For the chemical oxygen demand (COD) removal radiation of medium pressure mercury vapor UV lamp was used in the presence of hydrogen peroxide (H2O2/UV). Results indicated that the efficiency of COD removal depends on the initial concentration H2O2, oxidation time and pH. The efficiency of COD removal at low H2O2con-centration was very low even coupled with UV light, which can be attributed to the low generation of hydroxyl radicals (OH). At high concentration of H2O2 (500 mg/dm3) and optimum pH (pH = 4), 87.6% removal efficiency could be achieved during 70 min oxidation. For high concentration of H2O2 (500 mg/dm3) at pH 3 and 7, the maximum COD removal efficiency was 28.5% and 15.2% respectively, indicating significant roles of pH and H2O2concentration in the process of COD removal.
    Źródło:
    Environment Protection Engineering; 2017, 43, 1; 183-191
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pretreatment of Stabilized Landfill Leachate Using Ozone
    Autorzy:
    Kwarciak-Kozłowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/124499.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    landfill leachate
    ozonation
    hydrogen peroxide
    ultrasonic field
    advanced oxidation process
    Opis:
    The paper presents the possibility of using the ozonation process in landfill leachate pretreatment. The study was conducted in three stages. In the first stage, the landfill leachate was subjected only to the ozone, with the dose varying from 10 mg/dm3 to 40 mg/dm3. As part of this stage of research, the effect of changes in the pH of wastewater undergoing the process of ozonation on the efficiency of TOC removal was examined. For all the tested pH values (pH = 3.5, pH = 7 pH = 8.5 pH = 10), the TOC removal rate constant (kRowo) during ozonization was determined. In the second stage of the study, the ozonation process was facilitated by UV radiation. Additionally in this stage, the rate of generation of OH• radicals was accelerated by the addition of hydrogen peroxide to the reactor. The COD: H2O2 ratio by weight was 1:2.5, 1:5 and 1:10 and 1:20. In the last stage of the study, we attempted to assist the ozonation process using ultrasonic field. The employed vibration amplitude amounted to 25μm and sonication time equalled 300 seconds. It was found that the ozonation process is the most effective at alkaline pH (8.5). The TOC removal efficiency was 37% (346 mg/dm3) after 60 minutes of ozonation. The best results of pollutants oxidation measured as COD and TOC removal were observed when the dose of ozone was 20 mg/dm3. The combination of sonication and ozonation has resulted in a reduction of COD and TOC values by 370 mg/dm3 and 126 mg/3, respectively, in comparison to the ozonation process alone. It was found that the most effective process in landfill leachate treatment is the combination of ozonation with hydrogen peroxide addition (COD:H2O2=1:10). The COD, TOC and BOD values were 65%, 62% and 36% lower, respectively, in comparison to ozonation process conducted alone.
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 5; 186-193
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Batch and Continuous Photo-Fenton Oxidation of Reactive-Red Dye from Wastewater
    Autorzy:
    Hassan, Ali A.
    AlJaberi, Forat Yasir
    Al-Khateeb, Raid T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025725.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    dye
    wastewater treatment
    advanced oxidation process
    central composite design
    optimization
    Opis:
    This paper aims to investigate the ability of photo-Fenton technology to remove Reactive Red dye (RR-dye) from wastewater using batch and continuous operating modes. The batch mode of photo-Fenton removal of organic content was conducted under the influence of solution pH (3–10), hydrogen peroxide (25–100 ppm), irradiation time (20–90 min), ferrous sulphate (5–20 ppm), and temperature (25–60 °C). For comparison, the continuous treatment was conducted under the influence of the flow rate of the contaminated solution (10, 20, 30, 40, and 50 mL/min). The results revealed that the treatability of the batch mode was more effective compared to the continuous mode. In the batch process, the organic contaminant was completely removed compared to that of 82% obtained when the continuous system was performed. The optimization process showed that the optimal values of the operating variables in the case of the batch removal of RR-dye were 3, 78 ppm, 90 min, 20 ppm, and 60 °C for pH, hydrogen peroxide, irradiation time, ferrous sulphate, and temperature, respectively. Moreover, the reversion F-value was 21.69, the probability P value was less than 0.001, and the correlation coefficient was (R2 = 0.9455), which illustrative the significance of the model obtained for the batch process.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 1; 14-23
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany ekotoksyczności roztworów zawierających sulfonamidy w trakcie procesu zaawansowanego utleniania
    Changes in ecotoxicity of sulfonamides solutions during the advanced oxidation process
    Autorzy:
    Baran, W.
    Adamek, E.
    Ziemiańska, J.
    Makowski, A.
    Sobczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/125796.pdf
    Data publikacji:
    2012
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    sulfonamidy
    ekotoksyczność
    procesy zaawansowanego utleniania
    sulfonamides
    ecotoxicity
    advanced oxidation processes
    Opis:
    Procesy zaawansowanego utleniania (AOP) są często wykorzystywane do degradacji zanieczyszczeń odpornych na biodegradację i silnie toksycznych. Przykładem takich substancji są sulfonamidy zaliczane do syntetycznych chemioterapeutyków o działaniu bakteriostatycznym. Aby zastosowanie procesów AOP było uzasadnione, ważne jest, by ich produkty charakteryzowały się niższą ekotoksycznością niż substraty. Celem pracy była ocena ekotoksyczności sulfanilamidu i sulfametoksazolu oraz produktów reakcji ich utleniania za pomocą rodników hydroksylowych (HO•). Źródłem rodników była reakcja fotokatalityczna prowadzona w obecności TiO2. Ocenę ekotoksyczności wykonywano, wykorzystując standaryzowany test MARA® i procedury jego producenta. Test ten wykorzystuje jako bioindykatory dziesięć wyizolowanych szczepów bakteryjnych i drożdże. Stwierdzono, że większość bioindykatorów była praktycznie niewrażliwa na badane sulfonamidy do stężenia 500 μmol dm–3. Mikroorganizmami wrażliwymi w znacznie większym stopniu od pozostałych były szczepy Microbacterium spp. oraz Citrobacter freudii. Minimalne stężenia hamujące wyznaczone względem tych szczepów dla sulfanilamidu i sulfametoksazolu wynosiły odpowiednio 15 μmol dm–3 (Microbacterium spp.) i 19 μmol dm–3 (C. freudii). Stwierdzono również, że wypadkowy efekt inhibicyjny badanych próbek malał w trakcie trwania AOP, jednak znacznie wolniej niż towarzysząca mu degradacja sulfonamidów. Najsilniej efekt ten obserwowany był u mikroorganizmów bardziej wrażliwych na sulfonamidy. Jednak w pojedynczych przypadkach w trakcie AOP obserwowano również wzrost inhibicji w badanych roztworach.
    Advanced oxidation processes (AOP) are often used to degrade of organic pollutants that are resistant to biodegradation and highly toxic. Examples of such substances are sulfonamides classified as synthetic chemotherapeutics agents having a bacteriostatic effect. However, the application of AOP is useful and proper only when the resulting products will be less ecotoxic than substrates. The purpose of our study was to compare the ecotoxicity of sulfanilamide and sulfamethoxazole and products of their oxidation by hydroxyl radicals (HO•). These radicals were generated during the photocatalytic reaction carried out in the presence of TiO2. Ecotoxicological assessment was determined using a standardized MARA® toxicity test kit and procedures recommended by the test manufacturer. In MARA® test, eleven genetically diverse microorganisms (ten strains of bacteria and one yeast) are used as bioindicators. It was found, that the most of bioindicators was practically insensitive to sulfonamides investigated at concentrations to 500 μmol dm–3. Microbacterium spp. and Citrobacter freudii were much more sensitive microorganisms than the others. The minimum inhibitory concentrations (MTC) determined against these strains to sulfanilamide and sulfamethoxazole were 15 μmol dm–3 (Microbacterium spp.) and 19 μmol dm–3 (C. freudii), respectively. Additionally, it was found that the resultant inhibitory effect on the growth of tested microorganisms decreased during the AOP, but it was much slower than accompanying degradation of sulfonamides. The strongest effect was observed with microorganisms more sensitive to sulfonamides. However, in a few cases it was observed the increase in the inhibition during the AOP.
    Źródło:
    Proceedings of ECOpole; 2012, 6, 1; 313-318
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie procesu ozonowania w oczyszczaniu ścieków koksowniczych
    The Use of Ozonation Process in Coke Wastewater Treatment
    Autorzy:
    Kwarciak-Kozłowska, A.
    Krzywicka, A.
    Gałwa-Widera, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818115.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    ścieki koksownicze
    ozonowanie
    zaawansowane metody utleniania
    coke wastewater
    ozonation
    advanced oxidation process
    Opis:
    The paper presents presents the possibility of using the ozonation process in coke wastewater treatment. The wastewater produced during processing of coke was initially pre-treated mechanically in order to remove solid impurities, oils and tar substances. The raw wastewater was characterized by the phenolic odor, brown color and alkaline pH (pH 9.2). The COD value of raw wastewater was 8100 mg/dm3 and the value of BOD was very low (180 mg/dm3). A high concentration of total nitrogen (2420 mg/dm3) and TOC (2240 mg/dm3) was also noted. The study was conducted in three stages. In the first stage, coking wastewater was treated only by ozone, the dose of which varied from 10 mg/dm3 to 40 mg/dm3. The effect of pH during ozonation process was determined on TOC removal efficiency. For all of the pH values (pH = 3.5, pH = 7, pH = 8.5 and pH = 11.5) the TOC removal rate constant was determined. In the second stage, the rate OH radicals generation was accelerated by the addition of hydrogen peroxide to the reactor. The ratio by weight of COD: H2O2 was 1:2.5, 1:5, 1:10 and 1:20. In the last stage of the study, we attempted to assist the ozonation process with ultrasonic field. The sonication time was 8 minutes and the amplitude was 61.5 μm. It was found that the ozonation process is the most effective at alkaline pH (8.5). The TOC removal efficiency was 34% (1470 mg/dm3) after 60 minutes of ozonation. The best results of oxidation of pollutants measured as COD and TOC removal were observed when the dose of ozone was 30 mg/dm3.The combination of sonication and ozonation has resulted in a reduction of COD and TOC values by 1000 mg/dm3 and 300 mg/dm3, respectively, in comparison to ozonation process alone. It was found that the most effective process in coke wastewater treatment is the combination of ozonation with hydrogen peroxide addition (COD:H2O2=1:10). The COD, TOC and BOD value were 54%, 35% and 20% lower, respectively, in comparison to ozonation process conducted alone.
    Źródło:
    Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 2; 61-73
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment of Petroleum Refinery Wastewater by Graphite–Graphite Electro Fenton System Using Batch Recirculation Electrochemical Reactor
    Autorzy:
    Kassob, Ali Nadhum
    Abbar, Ali Hussein
    Powiązania:
    https://bibliotekanauki.pl/articles/2202176.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    advanced oxidation process
    COD removal
    electro-Fenton
    porous graphite
    response surface methodology
    Opis:
    Water pollution and the lack of access to clean water are general global problems that result from the expansion of industrial and agricultural activities. Petroleum refinery wastewaters are considered as a major challenge to the environment and their treatment is mandatory. The present work investigated the removal of chemical oxygen demand (COD) from petroleum refinery effluents generated from the Al-Dewaniya petroleum refinery plant located in Iraq by utilizing a novel graphite–graphite electro-Fenton (EF) system. The electrochemical reactor was a tubular type with a cylindrical cathode made from porous graphite and concentric porous graphite rode acts as an anode. By adopting the response surface methodology (RSM), the impacts of different operating variables on the COD removal were investigated. The optimal conditions were a current density of 25 mA/cm2, FeSO4 concentration of 1.4 mM, and electrolysis time of 90 minutes, which resulted in the COD removal efficiency (RE%) of 99% at a specific energy consumption (SEC) of 10.34 kWh/kg COD. The results indicated that both current density and concentration of FeSO4 have a major impact on the elimination of COD, while time has a minor effect. The adequacy of the model equation was demonstrated by its high R2 value (0.987). The present work demonstrated that the graphite–graphite EF system could be considered as an effective approach for removing of COD from petroleum refinery wastewaters.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 10; 291--303
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ozone Degradation of Lignin; its Impact Upon the Subsequent Biodegradation
    Degradacja ligniny w wyniku działania ozonem (AOP) oraz wpływ na późniejszą biodegradację
    Autorzy:
    Michniewicz, M.
    Stufka-Olczyk, J.
    Milczarek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/233915.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    degradation
    lignin
    ozone
    advanced oxidation process
    biodegradation
    degradacja
    związki ligninowe
    ozon
    biodegradacja
    Opis:
    The possible use of ozone and advanced oxidation processes (AOP) to degrade and eliminate lignin compounds from aqueous solutions, and the determination of the required ozone dose are the primary objectives of this study. The influence of the oxidation methods on the subsequent biological decomposition of the by-products was also investigated.During ozonisation of the alkalilignin aqueous solutions, the polymer is degraded to a degree depending on the ozone dose. Lignin content decreased by about 40 to 96.6% at an ozone dose of 0.1 and 3.6 mgO3/mgCOD, respectively, accompanied by a drop of COD in the range of 8.8 - 69.6%. An ozone dose of about 1 mgO3/mgCOD is required to reduce the lignin content by more than 80%; at such a dose, the reduction of COD was about 35%. Lignin proved to be a substance that is practically insusceptible to biodegradation under the test conditions. An increase of the susceptibility to biodegradation of the lignin disintegration products could have been observed at an appropriately high dose of ozone.
    Celem badań było sprawdzenie możliwości zastosowania ozonu i procesów pogłębionego utleniania (AOP) do degradacji i usunięcia związków ligninowych z roztworów wodnych oraz określenie wymaganej dawki ozonu. Ponadto przeprowadzono badania wpływu pogłębionego utleniania na dalszą biologiczną destrukcję produktów ubocznych rozkładu ligniny. W wyniku ozonowania wodnych roztworów alkaliligniny, polimer ten ulegał degradacji w stopniu zależnym od dawki ozonu. Redukcja zawartości ligniny była w miała zakresie od ok. 40,0 do 96,6%, przy dawce ozonu odpowiednio 0,1 i 3,6 mg O3/mgChZT. Jednocześnie zakres redukcji ChZT była w zakresie wynosił 8,8 – 69,6%. Dawka ozonu potrzebna do otrzymania redukcji ligniny powyżej 80% wynosi ok. 1 mgO3/mgChZT. Przy tej dawce redukcja ChZT wynosiła ok. 35%. Lignina okazała się substancją praktycznie nie podatną na biodegradację w warunkach prowadzenia testów. Przy odpowiednio wysokiej dawce ozonu stwierdzono wzrost podatności na biodegradację produktów rozpadu ligniny.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2012, 6B (96); 191-196
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transformation of Traditional Wastewater Treatment Methods into Advanced Oxidation Processes and the Role of Ozonation
    Autorzy:
    Nikbeen, Tamana
    Nayab, Ahmad Khalid
    Powiązania:
    https://bibliotekanauki.pl/articles/24201749.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    wastewater treatment
    traditional oxidation method
    ozonation
    advanced oxidation process
    disinfection by-product
    micropollutants
    Opis:
    Technology advancement improves the quality of life, however, it might also introduce new pollutants to the ecosystem, which needs to deal with for the goal of a sustainable ecosystem. Municipal and industrial wastewater has always been important in improving the quality of life while maintaining the sustainability of our planet simultaneously. The diversity of pollutants in wastewater requires more advanced and demanding treatment processes. The ozonation, as a crucial part of the advanced oxidation processes, is a superior oxidation method compared to traditional oxidation methods. After the recognition of ozone as GRAS (generally recognized as safe), its applications have diversified and is used currently for microbial inactivation, degradation of recalcitrant organic compounds, removal of a diverse range of micropollutants, solubilization and reduction of sludge, and removal of color and odor components in wastewaters treatment processes. However, some considerable challenges still exist towards its universal application, such as high ozone generation costs, diversity of pollutants, and formation of ozonation by-products, which still require further studies. The main theme of this review paper is the transformation of traditional oxidation methods into advanced oxidation processes and the role of ozonation in this regard, including its applications, by-products, and its comparison with the traditional oxidation methods and advanced oxidation processes.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 6; 173--189
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optymalizacja warunków procesu pogłębionego utleniania odcieków składowiskowych odczynnikiem Fentona
    Optimization of advanced oxidation process of the municipal landfill leachate by Fenton’s reagent
    Autorzy:
    Koc-Jurczyk, J.
    Jurczyk, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/357266.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Śląska
    Tematy:
    odcieki składowiskowe
    odczynnik Fentona
    temperatura
    landfill leachate
    Fenton's reagent
    temperature
    Opis:
    W badaniach analizowano wpływ temperatury i proporcji reagentów chemicznych (Fe2+ i H2O2) na efektywność usuwania ChZT i zmiany proporcji BZT5/ChZT w odciekach składowiskowych pochodzących z 21-letniego składowiska odpadów komunalnych (Polska, województwo podkarpackie). Przetestowano cztery temperatury prowadzenia procesu: 30, 40, 50 i 60˚C. Badania prowadzono przy stałej dawce H2O2 – 1 g/dm3 i zmieniającej się proporcji Fe2+:H2O2: 1:3, 1:2 i 1:1. Stwierdzono, że najniższa efektywność oczyszczania odcieków zachodziła w temperaturze 40˚C niezależnie od zastosowanej proporcji reagentów chemicznych. Najbardziej efektywną okazała się proporcja Fe2+:H2O2 1:1 i temperatura 30˚C.
    In this paper the influence of temperature and proportions of chemical reactants (Fe2+ i H2O2) on efficiency of COD removal and changes of BOD/COD ratios in leachate form 21 years old municipal landfill have been analyzed (Poland, Podkarpackie province). Four temperature variants: 30, 40, 50 i 60˚C. The process was conducted in constant H2O2 dose of 1 g/dm3, and variable proportions of Fe2+/H2O2: 1:3, 1:2 i 1:1. It was stated that in temperature of 40˚C treatment was most ineffective regardless of reactant doses. The most efficient conditions for examined wastewater was dose 1:1 at the temperature of 30˚C.
    Źródło:
    Archiwum Gospodarki Odpadami i Ochrony Środowiska; 2015, 17, 3; 1-8
    1733-4381
    Pojawia się w:
    Archiwum Gospodarki Odpadami i Ochrony Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Caffeine degradation in water by gamma irradiation, ozonation and ozonation/gamma irradiation
    Autorzy:
    Torun, M.
    Abbasova, D.
    Şolpan, D.
    Güven, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/146514.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    caffeine
    effect of ozone
    radiolytic decomposition
    advanced oxidation process (AOPs)
    caffeine decomposition
    COD change
    Opis:
    Aqueous solutions of caffeine were treated with ozone and gamma irradiation. The amounts of remaining caffeine were determined after solid phase extraction as a function of absorbed dose and ozonation time. In addition to this, some important parameters such as inorganic ions, chemical oxygen demand (COD) dissolved oxygen and total acidity changes were followed. Caffeine (50 ppm) is found to be completely decomposed at 3.0 kGy and 1.2 kGy doses in the absence of H2O2 and in 1.20 mM H2O2 solutions, respectively. In the case of gamma irradiation after ozonation, 50 ppm caffeine was removed at 0.2 kGy when the solution was ozonized for 100 s at a rate of 10 g O3 h–1 in 400 mL 50 ppm paracetamol solution.
    Źródło:
    Nukleonika; 2014, 59, 1; 25-35
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of catalytic processes for biodiesel production wastewater treatment
    Autorzy:
    Borralho, Teresa
    Coelho, Solange
    Estrelo, Andreia
    Powiązania:
    https://bibliotekanauki.pl/articles/205024.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cobalt
    chemical oxygen demand
    Fenton process
    biodiesel production wastewater
    catalytic advanced oxidation process
    potassium monopersulphate
    Opis:
    The study of the possibility of removing organic compounds from wastewater originating from the biodiesel purification stage by two catalytic processes, HSO5-/transition metal and Fenton method has been presented. The source of the ion HSO5-is potassium monopersulphate (2KHSO5∙KHSO4∙K5SO4) (Oxone) that may be decomposed into radicals (OH., SO4-., SO5-.) by means of transition metal as Co(II). Different concentrations were used for both compounds and the combination ([Co2+] = 1.00μM/[HSO5-] = 5.00·10-2 M) achieved the highest COD removal (60%) and complete decomposition of the oxidant was verified for contact times of 45 min. This process has some advantages comparing to the conventional Fenton method such as the absence of the costly pH adjustment and the Fe(III) hydroxide sludge which characterize this treatment process. The Fenton process showed that the combination of [H2O2] = 2.00M/[Fe2+] = 0.70 M was the best and archived COD removal of 80%. The treatments studied in this research have achieved high COD removal, but the wastewater from the biodiesel purification stage presents very high parametric values of Chemical Oxygen Demand (667,000 mgO2/L), so the final COD concentration reached is still above the emission limit of discharge in surface water, according the Portuguese Law (Decree-Law 236/98). However, both treatments have proved to be feasible techniques for the pre-oxidation of the wastewater under study and can be considered as a suitable pre-treatment for this type of wastewaters. A rough economic analysis of both processes was, also, made.
    Źródło:
    Archives of Environmental Protection; 2019, 45, 2; 66-72
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Application of Integrated System in Dairy Wastewater Treatment
    Zastosowanie zintegrowanego system w oczyszczaniu ścieków mleczarskich
    Autorzy:
    Kwarciak-Kozłowska, A.
    Gałwa-Widera, M.
    Bień, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813672.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    dairy wastewater
    photocatalysis
    TiO2
    ZnO
    advanced oxidation process
    ultrafiltration
    ścieki mleczarskie
    fotokataliza
    zaawansowane metody utleniania
    ultrafiltracja
    Opis:
    The study presented the results of the examinations obtained during treatment of dairy wastewater in a membrane photoreactor where photocatalysis was sequentially combined with low-pressure membrane process. The aim of the study was to determine the effectiveness of degradation of the contaminants contained in such wastewater during photocatalysis and in the arrangement that combined photocatalysis with ultrafiltration. Several experiments were performed in order to determine the most beneficial conditions of the photocatalysis process, e.g. the dose of the photocatalysts used (TiO2 and ZnO), duration of the process and pH of wastewater subjected to oxidation. The dose of titanium dioxide was changed from 1 to 40 g/dm3, whereas the content of zinc oxide ranged from 1 to 6 g/dm3. The results obtained in the study showed that the extension of the irradiation time to over 30 minutes (TiO2) and over 45 minutes (ZnO) during photocatalysis does not lead to increased removal of contaminants from the dairy wastewater. It was also demonstrated that the increase in the doses of both photocatalysts does not lead to the increase in the efficiency of their treatment. In the case of treatment of dairy wastwater with TiO2, the photocatalysis occurred most effectively for its dose of 10 g/dm3. Removal rates for COD, TOC and total nitrogen were 58% (1670 mg/dm3), 62% (450 mg/dm3) and 56% (128 mg/dm3), respectively. Replacing titanium dioxide with zinc oxide (ZnO – 2 g/dm3) in the photocatalysis process allowed for obtaining higher degrees of removal of contaminants determined as COD, TOC and total nitrogen to the level of 77.8% (870 mg/dm3), 62% (445 mg/dm3) and 52% (139 mg/dm3), respectively. Since both photocatalysts were supplied to the photoreactor in the form of a suspension, the membrane in the next reactor represented an efficient barrier for their particles. It was observed that higher volumetric stream of the permeate was obtained during the process of low-pressure membrane filtration of sewage initially treated in the process of photocatalysis with titanium dioxide (4.6·10-5 m3/m2·s – TiO2 and 4.1·10-5m3/m2·s – ZnO). It was found that the ultrafiltration process in the case of the feed material with TiO2 led to the reduction in COD, TOC and total nitrogen by 78% (370 mg/dm3), 72% (126 mg/dm3) and 40% (80 mg/dm3). Slightly better quality of permeate was obtained when the feed material contained ZnO powder. Degree of retention of the contaminants COD, TOC and total nitrogen were 68% (280 mg/dm3), 66% (143 mg/dm3) and 42% (76 mg/dm3), respectively.
    W pracy zaprezentowano wyniki badań jakie otrzymano podczas oczyszczania ścieków mleczarskich w fotoreaktorze membranowy w którym sekwencyjnie skojarzono procesy fotokatalizę z niskociśnieniowym procesem membranowymi. Celem badań było określenie skuteczności degradacji zanieczyszczeń znajdujących się w tego rodzaju wodach odpadowych w samodzielnie prowadzonym procesie fotokatalizy jak również w układzie kojarzącym go z procesem ultrafiltracji. Przeprowadzono szereg eksperymentów w celu ustalenia najkorzystniejszych warunków prowadzenia procesu fotokatalizy tj. dawka zastosowanych fotokatalizatorów (TiO2 i ZnO), czas prowadzenia procesu oraz wartość pH ścieków poddawanych utlenianiu. Dawkę ditlenku tytanu zmieniano w zakresie od 1 do 40 g/dm3 a tlenku cynku od 1 do 6 g/dm3. Na podstawie uzyskanych wyników badań stwierdzono, że wydłużanie czasu naświetlania powyżej 30 minut (TiO2) oraz powyżej 45 min (ZnO) w procesie fotokatalizy nie wpływa na zwiększanie usunięcia zanieczyszczeń z oczyszczanych ścieków mleczarskich. Wykazano również, że zwiększanie stosowanych dawek obu fotokatalizatorów nie skutkuje wzrostu efektywności ich oczyszczania. W przypadku oczyszczania ścieków mleczarskich z TiO2 proces fotokatalizy przebiegał najkorzystniej jego dawce wynoszącej 10 g/dm3. Stopień usunięcia ChZT, OWO i azotu ogólnego wynosił odpowiednio 58% (1670 mg/dm3), 62% (450 mg/dm3) i 56% (128 mg/dm3). Zastąpienie ditlenku tytanu tlenkiem cynku (ZnO – 2g/dm3) w procesie fotokatalizy pozwoliło na uzyskanie wyższych stopni usunięcia zanieczyszczeń oznaczanych jako ChZT, OWO i azotu ogólnego odpowiednio do poziomu 77.8% (870 mg/dm3), 62% (445 mg/dm3) i 52% (139 mg/dm3). Z uwagi na fakt, że oba dawkowano do fotoreaktora w formie zawiesiny to znajdująca się w kolejnym reaktorze membrana była skuteczną barierę dla ich cząstek. Zaobserwowano, że wyższy objętościowy strumień permeatu uzyskano w trakcie prowadzenia procesu niskociśnieniowej filtracji membranowej ścieków wstępnie podczyszczonych w procesie fotokatalizy z ditlenkiem tytanu (4,6·10-5 m3/m2·s – TiO2 i 4,1·10-5 m3/m2·s – ZnO). Stwierdzono że wykorzystany proces ultrafiltracji w przypadku nadawy z TiO2 przyczynił się do obniżenia wartości wskaźników ChZT, OWO i azotu ogólnego odpowiednio o 78% (370 mg/dm3), 72 % (126 mg/dm3) i 40% (80 mg/dm3). Nieznacznie lepszej jakości permeat otrzymano, gdy nadawa zawierała proszek ZnO. Stopień retencji zanieczyszczeń ChZT, OWO i azotu ogólnego wynosił odpowiednio 68% (280 mg/dm3), 66 % (143 mg/dm3) i 42% (76 mg/dm3).
    Źródło:
    Rocznik Ochrona Środowiska; 2018, Tom 20, cz. 1; 602-615
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic degradation of malachite green dye using doped and undoped ZnS nanoparticles
    Autorzy:
    Tolia, J.
    Chakraborty, M.
    Murthy, Z. V. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779662.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    metoda mechanochemiczna
    zaawansowany proces utlenienia
    degradacja fotokatalityczna
    malachit zielony
    nanocząstki
    mechanochemical method
    advanced oxidation process
    photocatalytic degradation
    malachite green
    nanoparticles
    Opis:
    In the present study, ZnS nanoparticles were prepared using the mechanochemical method. The ZnS nanoparticles prepared were doped with different concentrations of manganese using metal acetate and manganese acetate by mechanochemical method. The as-prepared particles were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The photocatalytic activity of the prepared nanoparticles samples, in the photocatalytic degradation of malachite green, had been investigated. The nanoparticles were photo induced, generating hole transfer for photocatalytic activity. The photodegradation of malachite green was observed at different pH (2-5) values, dye concentrations (10-100mg/L) and amount of ZnS nanoparticles (1-2.5 g/L). About 95% degradation of dye was observed on the addition of 2 g/L ZnS in 50 mg/L dye solution after 90 minutes illumination at 125 W. Degradation has been increased up to 99% using UV/nanoparticles/H2O2 (50 mL/L) combined process. The degradation efficiency was also compared using Mn doped ZnS nanoparticles (Zn1-x MnxS, where x = 0.01, 0.22 and 0.3). Maximum of 97% degradation was observed with 0.01% concentration of Mn. Kinetics study and performance of UV/ZnS, UV/ZnS/H2O2, UV/doped ZnS processes were evaluated to compare the efficiency of different processes.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 2; 16-21
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Bleaching of Linen Fabrics Using Ultraviolet Irradiation
    Nowy sposób bielenia tkanin lnianych z zastosowaniem napromieniowania UV
    Autorzy:
    Perincek, S
    Duran, K.
    Korlu, A. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/232001.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    advanced oxidation process
    bleaching
    finishing
    H2O2/UV
    linen
    ultraviolet radiation
    zaawansowany proces utleniania
    bielenie
    wykańczanie
    len
    promieniowanie ultrafioletowe
    Opis:
    The bleaching of greige linen woven fabric using ultraviolet irradiation on hydrogen peroxide impregnated samples was studied. The effect of a photoinitiator, sodium hydroxide, sodium peroxydisulphate for hydrogen peroxide, the irradiation time and distance between the fabric and ultraviolet light lamp on the samples’ whiteness, lightness, weight loss, moisture sorption and wettability properties was investigated. The UV/H2O2 bleaching process was optimised with the aid of Box-Behnken experimental design and three optimum recipes were achieved. As a result of the study, a novel bleaching process using ultraviolet irradiation and hydrogen peroxide for greige linen woven fabric was developed which saves on energy and time.
    Badano bielenie tkanin lnianych impregnowanych nadtlenkiem wodoru z zastosowaniem promieniowania ultrafioletowego. Badano wpływ fotoinicjatora, wodorotlenku sodu, nadsiarczanu sodu, nadtlenku wodoru, czasu naświetlania i odległości pomiędzy tkaniną a lampą UV na stopień bieli, jasność, utratę masy, sorpcję wilgoci i właściwości zwilżające. Proces bielenia UV/H2O2 zoptymalizowano przy pomocy metody Box-Behnkena. Uzyskano trzy optymalne receptury. W wyniku badań opracowano nowy proces bielenia tkanin lnianych, który pozwala na oszczędność energii i czasu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 2 (110); 107-115
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of organic compounds from wastewater originating from the production of printed circuit boards by UV-Fenton method
    Usuwanie związków organicznych ze ścieków pochodzących z produkcji obwodów drukowanych metodą UV-Fentona
    Autorzy:
    Thomas, M.
    Białecka, B.
    Zdebik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/204873.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    advanced oxidation process
    response surface methodology
    printed circuits board
    wastewater
    UV-Fenton
    zaawansowany proces utleniania
    metodologia powierzchni odpowiedzi
    płyta z obwodami drukowanymi
    ścieki
    Opis:
    The possibility of removing organic compounds from wastewater originating from the photochemical production of printed circuit boards by use of waste acidification and disposal of precipitated photopolymer in the first stage and the UV-Fenton method in a second stage has been presented. To optimize the process of advanced oxidation, the RSM (Response Surface Methodology) for three independent factors was applied, i.e. pH, the concentration of Fe(II) and H2O2 concentration. The use of optimized values of individual parameters in the process of wastewater treatment caused a decrease in the concentration of the organic compounds denoted as COD by approx. 87% in the first stage and approx. 98% after application of both processes. Precipitation and the decomposition of organic compounds was associated with a decrease of wastewater COD to below 100 mg O2/L whereas the initial value was 5550 mg O2/L. Decomposition of organic compounds and verification of the developed model of photopolymers removal was also carried out with use of alternative H2O2 sources i.e. CaO2, MgO2, and Na2CO3·1,5H2O2.
    Przedstawiono możliwość usuwania związków organicznych ze ścieków pochodzących z fotochemicznej produkcji obwodów drukowanych przez zastosowanie w pierwszym etapie zakwaszania ścieków i usuwaniem wytrąconego fotopolimeru, a w drugim etapie metody UV-Fentona. Do optymalizacji procesu pogłębionego utleniania zastosowano metodę powierzchni odpowiedzi dla trzech czynników niezależnych, tj.: pH, stężenia Fe(II) oraz stężenia H2O2. Zastosowanie zoptymalizowanych wartości poszczególnych parametrów w procesie oczyszczania ścieków spowodowało zmniejszenie stężania związków organicznych oznaczanych jako COD o ok. 87% w pierwszym etapie oraz ok. 98% po zastosowaniu obu procesów. Wytrącanie oraz rozkład związków organicznych związane były ze zmniejszeniem się COD ścieków do poniżej 100 mg O2/L, przy początkowej wartości wynoszącej 5550 mg O2/L. Rozkład związków organicznych oraz weryfi kację opracowanego modelu procesu usuwania fotopolimerów przeprowadzono także z zastosowaniem alternatywnych źródeł H2O2, tj.: CaO2, MgO2, i Na2CO3·1,5H2O2.
    Źródło:
    Archives of Environmental Protection; 2017, 43, 4; 39-49
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal efficiency of anionic surfactants from water during UVC photolysis and advanced oxidation process in H2O2/UVC system
    Efektywność usuwania surfaktantów anionowych z wody przy zastosowaniu promieniowania UVC i zaawansowanego utleniania w układzie H2O2/UVC
    Autorzy:
    Ríos, F.
    Olak-Kucharczyk, M.
    Gmurek, M.
    Ledakowicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/204800.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    advanced oxidation process
    anionic surfactants
    ether carboxylic derivate
    H2O2/UVC system
    linear alkyl benzene sulfonate
    UVC photolysis
    surfakanty
    degradacja surfakantów
    zaawansowany proces utleniania
    anionowe środki powierzchniowo czynne
    eter karboksylowy
    system H2O2 / UVC
    fotoliza
    Opis:
    Surfactants after their use are discharged into aquatic ecosystems. These compounds may be harmful to fauna and flora in surface waters or can be toxic for microorganisms of the activated sludge or biofilm in WWTP. In order to determine effectiveness of different advanced oxidation processes on the degradation of surfactants, in this study the degradation of anionic surfactants in aqueous solution using photolysis by 254 nm irradiation and by advanced oxidation process in a H2O2/UVC system was investigated. Two representatives of anionic surfactants, linear alkyl benzene sulphonate (LAS-R11-14) and ether carboxylic derivate (EC-R12-14E10) were tested. The influence of pH, initial surfactant concentration and dose of hydrogen peroxide on the degradation was also studied. Results show outstanding effectiveness of the H2O2/UVC system in the removal of surfactant from aqueous solutions.
    Surfaktanty, podobnie jak większość tego typu substancji chemicznych, po wykorzystaniu trafi ają do środowiska wodnego. Związki te mogą stwarzać zagrożenie dla fl ory i fauny zasiedlającej wody powierzchniowe, jak również mogą działać toksycznie na mikroorganizmy znajdujące się w osadzie czynnym w oczyszczalniach ścieków. W niniejszej pracy przedstawiono wyniki badań degradacji wybranych surfaktantów anionowych w środowisku wodnym przy zastosowaniu promieniowania UVC i zaawansowanego utleniania w układzie H2O2/UVC. Zbadano wpływ następujących parametrów reakcyjnych: odczyn środowiska reakcyjnego, początkowego stężenia obiektów badań i nadtlenku wodoru na szybkość degradacji surfaktantów. Uzyskane w toku prac badawczych wyniki potwierdzają wysoką skuteczność zaawansowanego utleniania w układzie H2O2/UVC w usuwaniu badanych surfaktantów ze środowiska wodnego, które jest procesem znacznie efektywniejszym w porównaniu do procesu fotolizy. Unauthenticated
    Źródło:
    Archives of Environmental Protection; 2017, 43, 1; 20-26
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porównanie efektywności oczyszczania poprocesowych wód koksowniczych z zastosowaniem procesów koagulacji oraz pogłębionego utleniania
    Comparing the effectiveness of treatment coking industry wastewater with applying for the coagulation process and advanced oxidation processes
    Autorzy:
    Mielczarek, K.
    Bohdziewicz, J.
    Kwarciak-Kozłowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/400981.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ścieki koksownicze
    koagulacja objętościowa
    koagulanty PIX
    pogłębione utlenianie
    odczynnik Fentona
    odwrócona osmoza
    coke wastewater
    volumetric coagulation
    coagulants-PIX
    advanced oxidation processes
    reagent Fenton
    reverse osmosis
    Opis:
    W artykule omówiono badania, których celem było porównanie efektywności oczyszczania ścieków z przemysłu koksowniczego w procesach koagulacji objętościowej i pogłębionego utleniania z zastosowaniem odczynnika Fentona. W przypadku z pierwszej z metod przebadano 4 rodzaje koagulantów żelazowych, produkowanych przez Zakład "Kemipol" o wspólnej nazwie PIX. Były to: PIX-112, PIX-123, PIX-122 oraz PIX-113. Dobrano najkorzystniejszy koagulant, wyznaczono jego optymalna dawkę oraz pH roztworu reakcyjnego (pH=5;9). Proces pogłębionego utleniania przeprowadzono dla ścieków różniących się kwasowością (pH=3,5 oraz pH=5), stosując różne dawki żelaza (Fe2+) zmieniane w zakresie od 0,1 g/dm3 do 0,8 g/dm3 zachowując stosunek stężeń Fe2+/H2O2 na poziomie 1:3. Z uwagi na zbyt niski stopień oczyszczania przedmiotowych wód pod-procesowych w obu przypadkach, uniemożliwiający ich odprowadzenie do zbiornika naturalnego lub kanalizacji, poddano je doczyszczeniu w procesie odwróconej osmozy. Efektywność procesów fizykochemicznego oczyszczania ścieków koksowniczych określono w oparciu o zmiany wartości zanieczyszczeń tj. chemicznego zapotrzebowanie tlenu oraz zawartości węgla organicznego i ogól-nego, stężenie indeksu fenolowego, cyjanków wolnych, siarczków oraz żelaza ogólnego.
    The article discusses research aimed at comparing the effectiveness of treatment of waste-water from coke industry in the volume of coagulation and advanced oxidation using Fenton's reagent. In the case of the first of the methods tested four types of iron coagulants are produced by the Department "Kemipol" a common name of the PIX. These were: PIX-112 PIX-123, PIX and PIX-122-113. Selects the best possible coagulant, determined its optimal dose and pH of the reaction solution (pH = 5, 9). Advanced oxidation process was carried out for treatment different acidity (pH = 3.5 and pH = 5), using different doses of iron (Fe 2 +) changed from 0.1 g / dm 3 to 0.8 g / dm 3 while maintaining the ratio of the concentrations of Fe2 + / H2O2 at 1:3. Given the very low degree of purification of these waters in both cases, prevent their discharge into the natural reservoir or sewage, treated them in the process of thoroughly cleaning of reverse osmosis. The effectiveness of the physicochemical wastewater treatment processes of coke have been identified based on the evolution of pollutants such as chemical oxygen demand and organic carbon content and total concentration of phenol index, free cyanide, sulfides and iron general.
    Źródło:
    Inżynieria Ekologiczna; 2011, 24; 184-194
    2081-139X
    2392-0629
    Pojawia się w:
    Inżynieria Ekologiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical pretreatment of formaldehyde wastewater by selected Advanced Oxidation Processes (AOPs)
    Autorzy:
    Kowalik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/115614.pdf
    Data publikacji:
    2011
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    advanced oxidation processes
    catalytic ozonation
    Fenton process
    Opis:
    Chemical oxidation processes: Fenton process and catalytic ozonation with Mn2+ ions were investigated for effectiveness of formaldehyde (FA) oxidation. The influence of operational variables — O3, H2O2, Mn2+ and Fe2+ concentrations and reaction time were investigated. Researches were carried out on aqueous solution of FA, which concentration was 500 mg/l. Fenton process was investigated at pH 3 and catalytic ozonation at pH 7, 10 and 12. Results revealed that Fenton process was much more effective in FA degradation than catalytic ozonation with Mn2+ as a catalyst. The optimal H2O2/Fe2+ dosage for a Fenton process was 2000/1000 mg/l. COD and FA concentrations were reduced 59,6% and 79,5%. In case of catalytic ozonation with Mn2+ the eff ectiveness was much less and it was the biggest at pH 12 and Mn2+ dosage 25 mg/l where COD and FA concentration were reduced 14% and 38%. Therefore, Fenton process can be promising technology for FA wastewater pretreatment.
    Źródło:
    Challenges of Modern Technology; 2011, 2, 4; 42-48
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel process of dye wastewater treatment by linking advanced chemical oxidation with biological oxidation
    Autorzy:
    Zou, H.
    Ma, W.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/204846.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dye wastewater
    Fenton's oxidation
    biological oxidation
    biological aerated filter
    advanced oxidation processes
    Opis:
    Dye wastewater is one of typically non-biodegradable industrial effluents. A new process linking Fenton’s oxidation with biological oxidation proposed in this study was investigated to degrade the organic substances from real dye wastewater. During the combination process, the Fenton’s oxidation process can reduce the organic load and enhance biodegradability of dye wastewater, which is followed by biological aerated filter (BAF) system to further remove organic substances in terms of discharge requirement. The results showed that 97.6% of chemical oxygen demand (COD) removal by the combination process was achieved at the optimum process parameters: pH of 3.5, H22
    Źródło:
    Archives of Environmental Protection; 2015, 41, 4; 33-39
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zużycie energii w procesie oczyszczania ścieków z wykorzystaniem metody pogłębionego utleniania
    The energy consumption in the process of waste water treatment with usage of advanced oxidation processes
    Autorzy:
    Kowalczyk, R.
    Bąbała, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/227935.pdf
    Data publikacji:
    2010
    Wydawca:
    Wyższa Szkoła Menedżerska w Warszawie
    Tematy:
    metoda pogłębionego utleniania
    zużycie energii
    oczyszczanie ścieków
    sewage purification
    wastewater treatment
    oxidation process
    Opis:
    Badano zużycie energii w procesie oczyszczania ścieków z wykorzystaniem metody pogłębionego utlenienia w podczyszczalni jednego z większych zakładów drobiarskich. Stwierdzono, że w procesie tym zużywa się 2-3 krotnie mniej energii niż w tradycyjnych technologiach oczyszczania w innych porównywalnych zakładach przemysłu spożywczego.
    The energy consumption in the process of sewage purification with usage of Advanced Oxidation Processes in treatment plant of waste water ofthe one of bigger poultry-breeding plant was investigated. It was found that in above mentioned process the energy consumption is 2-3 times lower then in traditional technologies of sewage purification in other food industry plants.
    Źródło:
    Postępy Techniki Przetwórstwa Spożywczego; 2010, 2; 61-63
    0867-793X
    2719-3691
    Pojawia się w:
    Postępy Techniki Przetwórstwa Spożywczego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania rozkładu niejonowych związków powierzchniowo czynnych w wybranych procesach pogłębionego utleniania
    Degradation of non-ionic surfactants by advanced oxidation processes
    Autorzy:
    Perkowski, J.
    Sidor, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/236913.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
    Tematy:
    środek powierzchniowo czynny
    utlenianie pogłębione
    proces fotochemiczny
    foto Fenton
    Fenton radiacyjny
    nonionic surfactants
    AOPs
    photochemical process
    photo-Fenton process
    radiation Fenton
    Opis:
    Przeprowadzono badania rozkładu niejonowych związków powierzchniowo czynnych w roztworach wodnych przy pomocy procesu Fentona. Zastosowane surfaktanty (Tritony, Tergitole i Symperoniki) różniły się obecnością pierścienia aromatycznego w cząsteczce, rodzajem łańcucha alkilowego oraz długością łańcucha polioksyetylenowego. Podjęto próbę określenia wpływu budowy cząsteczki niejonowego surfaktantu na przebieg procesu utlenienia i końcowy stopień mineralizacji roztworu, tj. na zawartość ogólnego węgla organicznego, chemiczne zapotrzebowanie na tlen i absorbancję roztworu. Porównując wyniki z wcześniejszymi rezultatami badań procesów pogłębionego utleniania (AOP) przy łącznym działaniu ozonu, promieniowania UV i nadtlenku wodoru stwierdzono, że proces Fentona należy do najbardziej skutecznych metod rozkładu niejonowych środków powierzchniowo czynnych.
    Non-ionic surfactants in water solutions were made subject to degradation by the Fenton process. The species used in the study (Tritons, Tergitols and Symperonics) differed in the presence of aromatic rings in the molecule, in the type of the alkyl chain and in the length of the polyoxyethylene chain. Consideration was given to the problem of how the structure of the surfactant molecule affects the course of the oxidation process and the final mineralization of the solution. Analyzed were the following parameters: total organic carbon, chemical oxygen demand and absorbancy of the solution. The study has substantiated the noticeably high efficiency of the Fenton process in degrading non-ionic surfactants.
    Źródło:
    Ochrona Środowiska; 2007, R. 29, nr 1, 1; 18-25
    1230-6169
    Pojawia się w:
    Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced oxidation treatment of pentoxifylline in aqueous solutions
    Autorzy:
    Kamińska, B.
    Skwierawska, A.
    Kozłowska-Tylingo, K.
    Tomczak-Wandzel, R.
    Pazik, A.
    Majewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/207333.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper(III)
    Fenton process
    sewage treatment plant
    toxicity
    pharmaceuticals
    reakcja Fentona
    miedź(III)
    farmaceutyki
    toksyczność
    oczyszczalnia ścieków
    Opis:
    The degradation of pentoxifylline (PTX) using H2O2, UV, H2O2/UV, Fenton and photo-Fenton processes has been examined in aqueous solutions. The influence of oxidation agent and initial PTX concentration, on H2O2, H2O2/UV, Fenton and photo-Fenton reactions was investigated. The addition of inorganic ions (Cl–, NO3–, SO42– and CO32–) on the degradation efficiency of PTX was tested for H2O2/UV, Fenton and photo-Fenton processeses. The results indicate that the photo-Fenton reaction is the most sufficient for PTX removal. The complete pharmaceutics decomposition is achieved after 5 min under optimized concentration of FeSO4,·7 H2O2 and H2O2. The degradation of PTX is inhibited in the presence of inorganic matter in H2O2/UV and Fenton reaction. In the photo-Fenton process addition of above compounds does not affect the reaction rate. Structures of ten products of photo-Fenton reaction have been proposed.
    Źródło:
    Environment Protection Engineering; 2017, 43, 1; 31-47
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowoczesne techniki i technologie inżynierii środowiska
    Novel Methods and Technologies in Environmental Engineering
    Autorzy:
    Miksch, K.
    Cema, G.
    Felis, E.
    Sochacki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818151.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    tlenowe granule
    zewnątrzkomórkowe polimery
    częściowa nitryfikacja
    proces Anammox
    zaawansowane procesy utleniania
    systemy hybrydowe
    oczyszczalnie hydrofitowe
    dekoloryzacja barwników
    bioremediacja gruntu
    mikoryza roślin
    techniki biologii molekularne
    PCR
    FISH
    aerobic granules
    granule formation
    extracellular polymeric substances
    partially nitrification
    anammox process
    advanced oxidation processes
    hybrid systems
    constructed wetlands
    decolorization
    synthetic dyes
    soil bioremediation
    plant mycorrhization
    molecular biology techniques
    Opis:
    The novel technologies used in environmental engineering were discussed in this paper – the formation of aerobic granules, the Anammox process, the advanced oxidation processes, the use of fungi for dyes decolorization, constructed wetlands, the soil phytoremediation supported by rhizosphere microorganisms and the use of molecular biology technique in environmental engineering. The structure of granular sludge is influenced by EPS production. The average diameter and density of biogranules increase due to EPS production. Although polysaccharides are essential, proteins were found to be the predominant component of aerobic granular sludge. Compared to loosely bound EPS (LB-EPS), tightly bound EPS (TB-EPS) showed more significant correlations with granules formation. This investigation will contribute towards a better understanding of the behavior and composition of EPS in sequencing batch reactors. The traditional nitrification and denitrification processes proceed well with typical municipal wastewater. Nevertheless, there are also nitrogen-rich wastewater streams like landfill leachate or reject waters from dewatering of digested sludge, for which traditional nitrification/denitrification can be generally ineffective due to free ammonia inhibition of nitrification and unfavorable biodegradable carbon content for denitrification. Because of high requirements for oxygen and the necessity for addition of external carbon source, treating such nitrogen-rich streams with nitrification/denitrification would become expensive and unsustainable. The least resources consuming pathway for the conversion of ammonium to nitrogen gas is a combination of partial nitrification and the Anammox process. The main advantages of this process compared to the conventional nitrification/denitrification are: low sludge production, decrease of the aeration costs by almost 60% (only half of the ammonia is oxidized to nitrite in the nitritation process without further oxidation to nitrate), and no need for external organic carbon source addition (Anammox process). Furthermore, anammox bacteria oxidize ammonium under anoxic conditions with nitrite as the electron acceptor, and converse energy for CO2 fixation. Additionally, the biomass yield of the Anammox process is very low (0.08 kg VSS kg NH4-N-1 in comparison to 1 kg VSS kg NH4-N-1 in conventional nitrification/denitrification process) consequently, little sludge is produced. The low sludge production is another factor that contributes to the substantially lower operation costs compared to conventional denitrification systems. Advanced oxidation processes (AOPs) are oxidative methods which are based on the generation of the hydroxyl radicals, which are very reactive and less selective than other oxidants. In the wastewater treatment technology, AOPs can be used in a combination with conventional biological techniques (so called hybrid processes), as pre- and post- treatment processes. The advanced oxidation processes have been used in order to increase the biodegradability and also detoxification of the wastewater. The ability of fungi to degrade lignin-cellulose debris is well known. In addition to these natural molecules they may also degrade synthetic compounds, including synthetic dyes. High effectiveness of Evans blue and brilliant green mixture removal by all tested strains was demonstrated. The process was the most effective and fast in shaken conditions. Finally strain MB removed 90% of tested mixture in shaken samples after 96h. It was the best result reached among all the strains used in the experiment. High removal efficiency was accompanied by a decrease of toxicity (from V class to III class in test with D. magna and from IV class even to non-toxic in test with L. minor). The highest decrease of phytotoxicity was noticed in samples with shaken biomass in which the effect of dyes mixture elimination was the best. The research indicates very high potential of tested strains for decolorization and detoxification of dyes mixture. Constructed wetlands are man-made system mimicking the process occurring in natural wetlands. These systems are considered to be an alternative to more technically advanced waste water treatment technologies. The development of constructed wetlands is envisaged to pursue the following directions grouped according to: the type of the waste water to be treated, target contaminants, treatment intensification methods, ancillary benefits and the locality. Mycorrhiza fungi can be used for phytoremediation proccess. They support plant growth by lowering the stress caused by the lack of phosphorus and water. They produce enzymes participating in several stages of xenobiotics decomposition, which is helpful in their further biodegradation performed by the other rhisospherical organisms. The natural colonisation of PAHs contaminated soil is a long-term process. It could be shortend by adding fungal propagules as an inoculum to the soil. Fungi used for the injections should be isolated from PAHs contaminated soil. That guarantees their survival and development in the contaminated environment. The level of PAHs elimination from soil depends on a type of bioremediation modification used. It was shown that the best results are obtained with monocotylous plants combined with bacterial and fungal biopreparations obtained from contaminated soil. The symbiosis of mycorrhiza fungi with monocotylous plants caused ca. 40% increase of 3, 4, 5 and 30% of 6-ring hydrocarbons removal from soil in comparison with the conventional methods. Important aspect of environmental protection and engineering is the possibility for qualitative and quantitative monitoring of complex microbial communities, responsible for biotechnological processes, such as: soil bioremediation, wastewater treatment or composting. Due to the fact that most of the environmental bacteria cannot be grown in the laboratory conditions molecular techniques are widely used in environmental engineering. Among these methods the Polymerase Chain Reaction (PCR)-based and hybridization-based (such as Fluorescent in situ Hybridization; FISH) techniques are known to be the most useful.
    Źródło:
    Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 1; 833-857
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-32 z 32

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