Temat: Fenton - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Treatment of Landfill Leachate by Using Fenton and Photo-Fenton Processes
Autorzy:: Leszczyński, J.
Powiązania:: https://bibliotekanauki.pl/articles/123282.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: landfill leachate
Fenton
photo-Fenton
Opis:: The paper deals with the study on the use of the Fenton and photo-Fenton process for the treatment of landfill leachates from a stabilized landfill site. The effluents were characterized by pH of 8.1, color: 1320 mg Pt/L, COD of 1670 mg/L, of BOD₅ 155 mg/L, conductivity of 10.3 mS/cm, absorbance of UV₂₅₄ 0.332 and turbidity of 11 NTU. It has been shown that by using Fe(II) and hydrogen peroxide in the Fenton reaction, the organic compounds expressed as COD can be efficiently removed from the effluents. The process was carried out at various doses of H₂O₂ and Fe(II), using different reaction times in the Fenton process and different times of exposure in the photo-Fenton process. The best conditions for the Fenton process were obtained with a Fe/COD ratio of 1.4 and a H₂O₂/Fe molar ratio of 3.2. Under these conditions, the removal efficiency of COD was 85.8%. It was also shown that additional UV irradiation of leachate in the so-called photo-Fenton process and the use of appropriate hydrogen peroxide dosing conditions, can increase the effectiveness of COD removal. The maximum effect of COD removal in the photo-Fenton process was 70.7% at a dose of H₂O₂ 3.3 g/L and a dose of Fe(II) of 0.6g Fe/L. An additional advantage of the photo-Fenton process is the ability to shorten the reaction time and reduce the dose of iron, which can thus reduce the amount of deposits generated.
Źródło:: Journal of Ecological Engineering; 2018, 19, 5; 194-199
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Metoda Fentona i jej modyfikacje w oczyszczaniu odcieków – praca przeglądowa
Fenton method and its modifications in the treatment leachate - for review
Autorzy:: Długosz, J
Powiązania:: https://bibliotekanauki.pl/articles/357278.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Śląska
Tematy:: leachate
AOP
Fenton process
photo-Fenton process
odcieki
metoda Fentona
foto Fenton
Opis:: Selecting a method of leachate management should take into account, inter alia, changing the chemical composition of the effluent and its quantity. Conventional treatment methods are not always effective and efficient, especially in the case of the removal of these substances hardly biodegradable. Therefore, an alternative to these methods are the methods of AOP (Advanced Oxygen Processes). Among these methods, the most common method of Fenton is known for more than 100 years. The paper presents a theoretical characterization of the Fenton process and its several possibilities modifications. Moreover, in general presents research conducted by scientists from around the world on the use of classical and modified Fenton process in wastewater effluents.
Wybierając metodę gospodarki odcieków należy uwzględnić m.in. zmieniający się skład chemiczny odcieku oraz jego ilość. Konwencjonalne metody oczyszczania ścieków nie zawsze są skuteczne i efektywne, a przede wszystkim w przypadku usuwania z nich substancji trudno biodegradowalnych. Dlatego też alternatywą dla tych metod są metody AOP (ang. Advanced Oxigen Processes). Wśród tych metod najpowszechniejszą jest metoda Fentona znana już od ponad 100lat. W artykule zaprezentowano teoretyczną charakterystykę procesu Fentona oraz jego kilka możliwości modyfikacji. Ponadto w sposób ogólny przedstawiono badania prowadzone przez naukowców z całego świata dotyczące zastosowania klasycznego oraz modyfikowanego procesu Fentona w oczyszczaniu odcieków.
Źródło:: Archiwum Gospodarki Odpadami i Ochrony Środowiska; 2014, 16, 4; 33-42
1733-4381
Pojawia się w:: Archiwum Gospodarki Odpadami i Ochrony Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Zastosowanie reakcji Fentona do rozkładu utleniającego eteru etylowo-t-butylowego (ETBE) w wodnych ekstraktach benzyn
Application of the Fentons reaction for oxidative destruction of ETBE contained in water extracts of petrol
Autorzy:: Kędzierska, E.
Konopka, M.
Kardasz, K.
Piotrowska, K.
Powiązania:: https://bibliotekanauki.pl/articles/256398.pdf
Data publikacji:: 2006
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:: Fenton's reaction
ethyl-t-butyl ether
ETBE
petrol
Fenton's reagent
Opis:: W pracy podjęto próbę usuwania eteru etylowo-t-butylowego (ETBE) z wodnych ekstraktów benzyn poprzez utlenianie nadtlenkiem wodoru w reakcji Fentona. Zdolność ETBE do rozkładu pod wpływem nadtlenku wodoru w temperaturze otoczenia stanowi potencjalną możliwość usuwania tego eteru z wody zanieczyszczonej benzyną, która zawiera ETBE jako komponent.
Ethyl-t-butyl ether (ETBE) is commonly used as a fuel component, which sometimes results in its introduction into the environment, especially to ground water. The aim of this research study is to investigate the activity of Fenton's reagent with the water extracts of the fuels containing ETBE. The ETBE removal was successfully accomplished at ambient temperature in the presence of more than 0,3 g of FeSO4 catalyst per 100 cm3 of the extract.
Źródło:: Problemy Eksploatacji; 2006, 3; 223-231
1232-9312
Pojawia się w:: Problemy Eksploatacji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Henry John Horstman Fenton - short biography and brief history of Fenton reagent discovery
Henry John Horstman Fenton - krótka biografia i historia odkrycia odczynnika Fentona
Autorzy:: Barbusiński, K.
Powiązania:: https://bibliotekanauki.pl/articles/106641.pdf
Data publikacji:: 2009
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: Fenton's biography
Fenton reaction
Fenton's reagent
Fenton chemistry
hydroxyl radical
ferryl ion
advanced oxidation
biografia Fentona
reakcja Fentona
odczynnik Fentona
chemia Fentona
rodnik hydroksylowy
jon ferrylowy
pogłębione utlenianie
Opis:: The short biography of H.J.H. Fenton, an outstanding chemist, and brief history of Fenton reagent discovery were presented. Fenton reagent is defined, as a mixture of hydrogen peroxide and iron(II) ion (H2O2 + Fe2+). This is one of the most effective oxidizing agents for destroying organic compounds. The extraordinariness of Fenton chemistry results from the fact that it is very common in chemical, biological, and natural environmental systems. Nowadays, Fenton reagent plays a very important role in free radical biology and medicine. A very important role it also plays in natural environmental systems, and environment protection engineering (for example in wastewater treatment and remediation of groundwater). Therefore, it can be assumed, that the Fenton’s discovery has played a very important role in all aspects of our life.
W artykule przedstawiono krótką biografię H.J.H. Fentona, wybitnego chemika, a także opisano zwięźle historię odkrycia tzw. odczynnika Fentona, definiowanego jako mieszanina nadtlenku wodoru i soli żelaza(II). Odczynnik Fentona jest jednym z najbardziej efektywnych czynników zdolnych do utleniania i degradacji substancji organicznych. Niezwykłość odczynnika Fentona (oraz reakcji Fentona) wynika z faktu, że powszechnie występuje w systemach chemicznych, biologicznych oraz w środowisku naturalnym. Obecnie odczynnik Fentona odgrywa bardzo ważną rolę w biologii rodnikowej oraz w medycynie. Również bardzo ważną rolę spełnia w środowisku naturalnym oraz inżynierii ochrony środowiska jako czynnik degradujący zanieczyszczenia. Dlatego mozna stwierdzić, że odkrycie dokonane przez Fentona ma bardzo duże znaczenie we wszystkich aspektach naszego życia.
Źródło:: Chemistry-Didactics-Ecology-Metrology; 2009, 14, 1-2; 101-105
2084-4506
Pojawia się w:: Chemistry-Didactics-Ecology-Metrology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Enhancement the conditioning of waste activated sludge through a sequence of freeze/thaw-electro-Fenton process
Autorzy:: Shahheidar, N.
Jorfi, S.
Takdastan, A.
Jaafarzadeh, N.
Ahmadi, M.
Powiązania:: https://bibliotekanauki.pl/articles/779096.pdf
Data publikacji:: 2018
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: Sludge conditioning
freeze
thaw
electro-Fenton
Opis:: Sludge conditioning is an important stage in sludge management. In the present study, a sequence of freeze/thaw-electro-Fenton process was designed and specific resistance filtration (SRF) was monitored during sludge conditioning as an important factor in sludge dewaterability. Furthermore, protein and polysaccharide concentrations were measured during the experiments. Results showed that the lowest SRF value contributed to −10°C in freezing process which showed a reducing trend by decreasing solution pH. In addition, results revealed that solution pH less than 3 caused a significant improvement in sludge dewatering; so the lowest SRF has been registered at pH = 2. By increasing current intensity from 0.5 to 1A, SRF values were reduced and then followed by an enhancement with increasing current intensity to 3.2 A. The lowest SRF value (6.1 × 104 m/kg) was obtained at H2O2 = 30 mg/L which was the best conditions for sludge dewatering.
Źródło:: Polish Journal of Chemical Technology; 2018, 20, 1; 47-53
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Możliwość zastosowania odczynnika Fentona w procesach usuwania formaldehydu ze ścieków pochodzących z przemysłu drzewnego
Application of Fenton reagent in the process of formaldehyde removal from the timber industry wastewater
Autorzy:: Dębowski, M.
Zieliński, M.
Dudek, M.
Grala, A.
Powiązania:: https://bibliotekanauki.pl/articles/1819294.pdf
Data publikacji:: 2012
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: degradation
Fenton's reagent
constant magnetic field
Opis:: The aim of this study was to determine the possibility of degradation of formaldehyde in the effluents from the timber industry with Fenton's reagent. Effluent from the timber industry are characterized by a high concentration of organic compounds and formaldehyde as an obstacle to the purification of wastewater using microorganisms and therefore an alternative to biological methods is the use of solutions based on chemical methods. In recent years, considerable attention is given to testing and implementation of the so-called advanced oxidation methods (Advanced Oxidation Processes - AOPs). A common feature of these systems is that they allow the generation of highly reactive hydroxyl radicals OH center dot with 2,8 V oxidation potential, which react with almost all organic compounds. Fast-paced distribution of impurities, versatility and high efficiency make advanced oxidation methods are now increasingly considered as a promising alternative compared to conventional methods, techniques, wastewater and sludge treatment Wastewater used in the study came from the wood of an industrial plant where the business is the manufacture of chipboard. The study was conducted in three phases with different type of chemical reactants introduced into the technological system. In the first stage reactor was dosed only iron ions Fe3+, H2O2 in the second stage, while the third part of an experiment to test the Fenton reagent treatment was introduced Fe3+ /H2O2. Each stage is divided into five variants. The criterion for division of the variants was the dose of chemical reagents. The study confirmed the applicability of advanced oxidation technologies based on Fenton's reagent in the process of degradation of formaldehyde. It was found that the efficiency of removal of contaminants from wastewater was directly connected with the dose of chemical reagents introduced into the technological system. It was also noted that increasing the dose above the Fenton reagent Fe3+ 0,3 g /l and 3,0 g H2O2/l does not significantly affect the final results of the purification process. The highest results were obtained in the technology used in doses of 0,3 g Fe 3+/l and 3,0 g H2O2 /l to 0,6 g Fe3+/l and 6,0 g H2O2/l. Limiting values of COD in the experimental variants was approximately 70,0% while the concentration of formaldehyde close to 60,0%. If dispensing the water only Fe3+ ions obtained the highest efficiency and reduce the COD concentration of formaldehyde was 28,3% sequentially and 14,5%. The final concentrations of the analyzed indicators of pollution, if only H2O2 dosing were similar to their concentrations in raw wastewater.
Źródło:: Rocznik Ochrona Środowiska; 2012, Tom 14; 587-596
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A comparative study of advanced oxidative processes. Degradation of chlorinated organic compounds in ultrafiltration fractions of kraft pulp bleaching effluent
Autorzy:: Fiskari, J.
Kakkonen, A.
Pakkanen, H.
Alén, R.
Powiązania:: https://bibliotekanauki.pl/articles/208297.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: photocatalysis
Fenton method
metoda Fentona
fotokataliza
Opis:: Oxidative pretreatment methods such as the Fenton oxidation, ozonation, and photocatalytic treatment have been compared in reducing adsorbable organic halogens (AOX) and chlorophenolic compounds in untreated kraft pulp bleaching effluent. Their efficiency was also studied on effluent ultrafiltration fractions. The Fenton treatment removed all analyzed chlorophenolic compounds from the effluent. Ozonation and photocatalysis appeared to be much less effective methods. The efficiency of the Fenton oxidation appeared to be more pronounced in higher molecular weight effluent fractions. This suggests a novel design, where the filtration stage can be placed after the oxidation, and the high-molecular weight fraction is returned to the Fenton treatment.
Źródło:: Environment Protection Engineering; 2016, 42, 4; 151-159
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The Efficiency of Landfill Leachate Treatment Using the Fenton’s Reagent
Autorzy:: Koc-Jurczyk, J.
Jurczyk, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/124411.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: wastewater treatment
landfill leachate
Fenton's reagent
Opis:: In this studies the influence of the dose and ratio of chemical reagents (Fe²⁺ and H₂O₂) on the efficiency of COD removal and changes of BOD₅/COD ratio in landfill leachate was analysed. The molar Fe2+/H₂O₂ ratio was lower than 1 and amounted to: 1:10, 1:5, 1:3, three research series with 1; 2.5 and 5 g/L Fe²⁺ concentration. A higher efficiency in removing BOD than COD, and therefore the decrease of BOD₅/COD ratio in effluent was stated. The efficiency of COD removal from leachate was from 58.34% (Fe²⁺ 0.5 g/L, Fe2²⁺/H₂O₂ 1:5) to 8.33% (Fe²⁺ = 0.1 g/L, Fe2+/H₂O₂ = 1:10), while the efficiency of BOD removal ranged from 62 to 77%. With the molar ratio Fe²⁺/H₂O₂ equal 1:5 the BOD₅/COD ratio was the largest for each of the analysed Fe²⁺ doses. The lowest BOD₅/COD ratio was observed for the Fe²⁺ dose 0.1 g/L and molar ratio of reagents 1:3.
Źródło:: Journal of Ecological Engineering; 2015, 16, 3; 70-76
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Removal of Sesame Oil from Artificial Wastewater Applying Fenton Process and Comparing It with Actual Wastewater
Autorzy:: Nasir, Mohsin J.
Kadhum, Zaid F.
Kariem, Nagham O.
Jasim, Zaid M.
Powiązania:: https://bibliotekanauki.pl/articles/2202107.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: sesame oil
wastewater
fenton
technique
efficiency
Opis:: In this research the removal of sesame oil from aritifical water by Fenton process technique was investigated. The results of removal efficiency were compared with actual wastewater. Effect of time, pH, mixing speed, temperature, oil content were investigated to find the perfect circumstances. The conducted experiments revealed that the optimal conditions for this process were 160 minutes of reaction time in an acidic medium where pH was equal to 3.5, temperature was discovered to be 25 °C, the optimal mixing speed was at 500 rpm, and the Sesame oil concentration amounted to 1500 mg/l. Applying the optimal conditions for this processing, the results of compersion showed the sesame oil had a removal efficiency of 95% for the artificial wastewater in which the concentration decreased from 12800 to 68 mg/l, while the Fenton method was used to treat an actual sample of wastewater the removal efficiency is found to be 87%.
Źródło:: Journal of Ecological Engineering; 2022, 23, 10; 248--254
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

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

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Skocz do pozycji: 12.

Tytuł:: Influence of pH in AOP on Humic Compounds Removal from Municipal Landfill Leachate Concentrate after Reverse Osmosis
Autorzy:: Koc-Jurczyk, Justyna
Jurczyk, Łukasz
Powiązania:: https://bibliotekanauki.pl/articles/125093.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: AOP
Fenton's reagent
RO retentate
landfill leachate
Opis:: The choice of the optimal method of municipal waste landfill leachate treatment should take into account such factors as: the variability of their composition and quantity over time, requirements for effluent or economic capacity. Due to the variety of compounds found in landfill leachate, it is advised to use a combination of different treatment processes. Biological methods are effective in the treatment of leachates from young landfills, but generally their efficiency declines significantly with the age of the landfill. Therefore, the physicochemical methods, i.e. advanced oxidation, adsorption, membrane methods or a combination of the mentioned, are preferred. The aim of the study was the assessment of the Fenton’s reagent utilization to process reverse osmosis concentrate of leachates collected from municipal non-hazardous waste landfill. The research was focused on the influence of pH on the process. Additionally, the effectiveness of organic compounds removal, increasing the biodegradability, as well as humic substances transformations were determined. The concentrations of humic compounds were measured by means of optical density at the wavelengths: 254, 265, 280, 320, 465 and 665 nm. In the experiment, the H₂O₂/Fe²⁺ 10: 1 ratio was tested at with a dose of H₂O₂ equal to 3.4 g/l (0.1 M). It was found that the pH affects the efficiency of COD removal and the increase of the biodegradability of the landfill leachate retentate, as well as the removal of humic substances and its transformation. It was found that at pH 3, the highest removal of COD occurs, with simultaneous increase in biodegradability, and decrease of absorbance caused by humic compounds.
Źródło:: Journal of Ecological Engineering; 2019, 20, 2; 161-168
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Phenol Oxidation in the Photo-Fenton Process Catalyzed by Clinoptylolite Modified with Co
Utlenianie fenolu w procesie foto-Fentona katalizowanym przez klinoptylolit modyfikowany Co
Autorzy:: Świderska-Dąbrowska, R.
Powiązania:: https://bibliotekanauki.pl/articles/1818179.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: cobalt clinoptilolite
heterogeneous catalyst
photo-Fenton process
phenol degradation
klinoptylolit modyfikowany jonami kobaltu
katalizator heterogeniczny
foto Fenton
rozkład fenolu
Opis:: W pracy przedstawiono wyniki badań utleniania fenolu w procesie foto-Fentona z zastosowaniem heterogenicznego katalizatora Co-Clin (naturalny klinoptylolit, modyfikowany jonami Co(II)). Analiza widm EDS mikroskopem skaningowym wykazała, że modyfikacja ma charakter powierzchniowy i wewnątrzkanałowy, a krystality Co3O4 są nierównomiernie rozproszone na powierzchni zeolitu – więcej jest ich wzdłuż struktury krystalicznej i charakteryzują się większą zawartością Co (ok. 1,4% wag.). Przy wyższej z badanych, dawce zeolitu 5 g/l (zawierającej ok. 43 mg Co) po 4 godzinach procesu utleniania, usunięto zaledwie 20% TOC. Jednocześnie badania wykazały, że w wyniku rozkładu zmniejsza się stężenie fenolu, a powstaje jako produkt pośredni głównie hydrochinon i w śladowej ilości rezorcyna. W badanym zakresie czasu trwania reakcji utleniania nie powstawały kolejne jej produkty. Podczas reakcji utleniania, wraz z obniżaniem się pH roztworu, z powierzchni zeolitu wymywane są jony Co(II), które nie wpływają jednak znacząco na efektywność procesu foto-Fentona. Przy udziale homogenicznego katalizatora uzyskano zaledwie 4% usunięcie TOC, które było porównywalne z efektem uzyskanym w układzie bez katalizatora: H2O2+UV. Świadczy to, że utlenianie fenolu zachodzi przede wszystkim w heterogenicznym procesie foto-Fentona, aczkolwiek jego niewielka efektywność wyklucza zastosowanie katalizatora Co-Clin w skali technicznej do utleniania zanieczyszczeń przemysłowych.
Źródło:: Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 1; 113-124
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Zastosowanie reakcji Fentona do wspomagania biologicznego oczyszczania ścieków z przemysłu mleczarskiego
Application of Fenton Reaction for Supporting Biological Wastewater Treatment from the Dairy Industry
Autorzy:: Krzemińska, D.
Neczaj, E.
Parkitna, K.
Powiązania:: https://bibliotekanauki.pl/articles/1819268.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: reakcja Fentona
biologiczne oczyszczanie ścieków
wastewaters
Fenton reaction
Opis:: The dairy industry is one of the most polluting of industries, not only in terms of the volume of efﬂuent generated, but also in terms of its characteristics as well. The composition of waste water produced in the milk processing plants depends primarily on the type of production (such as ﬂuid milk, butter, cheese, buttermilk, whey, yogurt, condensed milk, ﬂavored milk, milk powder, ice cream, etc.). The factors influencing the composition and charge of waste water are the raw materials used, level of technology plant, cleaning and disinfection processes and the amount of water used. Still increased pollution, combined with increased industrial activity and increasingly restrictive laws concerning discharges, focuses on the problem of optimal industry wastewater treatment. High concentration of organic matter in dairy wastewater causes problems with their removal in biological methods. Combining advanced oxidation process (AOP) and biological process has received attention in recent years as a promising alternative for industrial wastewater treatment. Among biological treatment processes the sequencing batch reactor (SBR) have been widely applied for treating dairy wastewater. The advantages of this technology can include high flexibility and ease of adaptation of operating parameters. Sequencing batch reactor is the name given to wastewater treatment systems based on activated sludge, operated on a sequence changes of anaerobic and aerobic conditions in one reactor. Using AOP pretreatment is important to improve the biodegradability and produce an effluent that can be treated biologically These processes involve the generation of highly free radicals, mainly hydroxyl radical (HO) via chemical, photochemical and photocatalytic reactions. One of the most important AOP process is Fenton reaction. Effectiveness of Fenton reaction has been confirmed in the case of pharmaceutical wastewater, treatment of brines or treatment of paper pulp manufacturing effluents. The oxidation system based on the Fenton’s reagent (hydrogen peroxide in the presence of a ferrous salt under acidic conditions) has been used for the treatment of both organic and inorganic substances of the wastewater stream. The present study was aimed to treat the dairy wastewater by Fenton’s process and an aerobic sequencing batch reactor. The ﬁrst part of this study examined the effect of operating conditions on Fenton`s process pretreatment of dairy wastewater. The effectiveness of the AOP pretreatment was assessed by evaluating wastewater biodegradability enhancement (BOD5/COD), as well as monitoring major pollutant concentrations (COD) with reaction time. The optimum dose Fe2+ and H2O2 was found to be 1.2 and 2.0 g/L, respectively. In a single biological treatment the average removal efficiencies of COD, and NH4+ were 67%, and 61%, respectively. Integration of Fenton`s process and biological treatment resulted in 93% removal of COD and 79% NH4+ from the dairy wastewater. The results indicated that the combined process would be a promising alternative for the treatment of dairy wastewater.
Źródło:: Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2381-2397
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Treatment of Laboratory Wastewater by Using Fenton Reagent and Combination of Coagulation-Adsorption as Pretreatment
Autorzy:: Arita, Susila
Agustina, Tuty Emilia
Ilmi, Nurul
Pranajaya, Violanda Dwi Wulandari
Gayatri, Rianyza
Powiązania:: https://bibliotekanauki.pl/articles/2173343.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: laboratory wastewater
fenton reagent
coagulation
adsorption
heavy metal
Opis:: Laboratory wastewater contains organic and inorganic compounds that are harmful to the environment when disposed of without prior treatment. Besides the high COD and BOD values, the laboratory wastewater also contains metals such as iron (Fe), zinc (Zn), copper (Cu), chromium (Cr), and lead (Pb) which is categorized as dangerous waste material and can pollute the groundwater. Although the quantity of wastewater produced by the laboratory is relatively small, it has a real impact on the environment around the laboratory. However, the wastewater has to be treated properly before being discharged into the environment. The aim of the research was to study the laboratory wastewater treatment by using Fenton’s reagent with coagulation and adsorption pretreatment. In the pretreatment with coagulation, three types of coagulants are used, namely PAC (Poly Aluminum Chloride), ACH (Aluminum Chlorohydrate) and Aluminum Sulfate (AS) with their respective concentrations of 10–80 ppm. The highest percentage of average pollutant removal of 58.21% was found when 80 ppm of AS was applied. The pretreatment was continued by adsorption with activated carbon and zeolite adsorbents within 60–120 minutes of mixing time. It was detected that the most optimum adsorbent was activated carbon with average pollutant removal of 50.22% within 1 hour of mixing time. Processing was extended by utilized Fenton’s reagent using a variation of the molar ratio between 1:100 and 1:400. It was obtained that the best molar ratio to degrade the laboratory wastewater is 1:300 with an average removal of pollutant of 43.45%. As a result of laboratory wastewater treatment using combine Fenton’s reagent and coagulation-adsorption pretreatment, an average pollutant removal of 90.81% was obtained. The final content of COD, BOD, TSS, as well as Cu and Pb metal has met the environmental quality standard.
Źródło:: Journal of Ecological Engineering; 2022, 23, 8; 211--221
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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