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    Tytuł:
    Modelling of carbon and nitrogen compounds removal from domestic wastewater in a modernized biological reactor
    Autorzy:
    Makowska, M.
    Jadanowski, S.
    Tränckner, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/207574.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biological reactor
    domestic wastewater
    activated sludge process
    hybrid technology
    removal nitrogen
    reaktor biologiczny
    ścieki domowe
    proces osadu czynnego
    proces hybrydowy
    usuwanie azotu
    Opis:
    Upgrading concepts for the Bioblok MU200a wastewater treatment plant have been presented. The main goals were to achieve an effective nitrogen removal and reduce energy demand. The reference version has been presented, followed by two retrofitting options: introduction of intermittent aeration for alternating aerobic and anoxic conditions, additionally including a retrofitting option to a hybrid technology that combines advantages of activated sludge and biofilm. To design and assess both variants, the ASM3 model was used, running on the Simba# simulator. A rather complex biofilm model, necessary for the hybrid concept, was bypassed by installing a separate activated sludge process differing in terms of sludge age and disposal of its excess sludge to the reactor. In this way, favorable technological parameters for efficient wastewater treatment could be assessed. Both upgrading concepts can be recommended for their satisfactory treatment effectiveness, feasibility in existing plants and considerable energy savings. The significance of the modelled effects was statistically confirmed two-tailed Student’s t-test.
    Źródło:
    Environment Protection Engineering; 2018, 44, 4; 69-83
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytoremediation of urea fertilizer factory wastewater by teak (Tectona grandis)
    Autorzy:
    Yavari, S.
    Malakahmad, A.
    Sapari, N. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/207362.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phytoremediation
    nitrogen removal
    urea
    Tecona grandis
    sludge
    fitoremediacja
    usuwanie azotu
    mocznik
    ścieki
    Opis:
    Urea manufacturing discharge contains a high load of nitrogen, a pollutant which needs advanced technologies to be reduced to desirable levels. However, these advanced technologies are expensive due to the complex process and cost of chemicals and maintenance. Phytoremediation has been recently considered for N removal from various wastewaters. However, the common phytoremediation plants (reeds and grasses) are not able to remove N effectively due to the recyclable nature of N through decomposition processes. Therefore, they require periodic harvestings which impose a high cost on system. In this study, the growth and phytoremediation potential of teak (Tectona grandis), a tropical timber plant, to treat the urea manufacturing wastewater was evaluated. Eight month old teak seedlings received 4 different concentrations of N in bench-scale constructed wetlands every 4 days for 8 weeks. The solution volumes supplied to each container and plant biomass, N recovery, and tissue nutrient concentration were measured. Teak plants showed an escalation in wastewater N uptake with increasing amount of supplied N. Total dry weight was positively correlated with total N supplied. Teak seedlings showed a considerable potential for removing nitrogen when they were supplied with up to 5 g N per pot volume (4 dm3) during a two-month experiment.
    Źródło:
    Environment Protection Engineering; 2017, 43, 4; 5-15
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of simultaneous nitrification and denitrification (SND) in structured-bed reactors operated with different wastewater
    Ocena procesu symultanicznej nitryfikacji i denitryfikacji (SND) w reaktorze ze złożem stałym prowadzonego przy użyciu różnego rodzaju ścieków
    Autorzy:
    Diniz dos Santos, Carla Eloísa
    Rissato Zamariolli Damianovic, Márcia Helena
    Powiązania:
    https://bibliotekanauki.pl/chapters/2231735.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    COD removal
    nitrogen removal
    simultaneous nitrification and denitrification (SND)
    structured-bed reactor submitted to recirculation and intermittent aeration (SBRRIA)
    Opis:
    This study aimed to show the application of a structured-bed reactor subjected to recirculation and intermittent aeration (SBBRIA) for nitrogen and carbon removal from three different wastewater streams. Three different types of sludge were used for inoculation of the reactors: sludge from an UASB reactor (reactor R1), sludge from an activated sludge reactor with nitrifying activity (reactor R2) and a mixture of sludge used in R1 and R2 (reactor R3). Different operational procedures were applied in order to analyze the influence of HRT in R1, the influence of aerobic/anoxic phases in R2 and the influence of COD/N ratio in R3. The efficiencies of COD removal remained higher than 85%, regardless of the decrease in HRT, the adoption of different cycles of intermittent aeration or different COD/N ratios. The total-N removal efficiencies obtained for both reactors suggested that HRT is the operational parameter that has more influence in the nitrogen removal performance. Moreover, considering the results obtained with the treatment of three different types of wastewater, the SBRRIA reactor is adequate in conditions of high or low availability of electron donors for heterotrophic denitrification, due to the establishment of the anaerobic ammonium oxidation (anammox) process as an additional pathway of nitrogen removal under conditions of reduced COD/N ratio.
    Celem badań było ukazanie możliwości zastosowania reaktora ze złożem stałym do usuwania azotu i węgla z trzech różnych rodzajów ścieków. Badania przeprowadzono w trzech reaktorach nazwanych R1, R2 i R3, które zaszczepiono odpowiednio osadem pochodzącym z reaktora UASB, biomasą z reaktora pracującego w procesie nitryfikacji oraz mieszaniną obu wspomnianych typów biomasy. W badaniach określano także wpływ parametrów technologicznych, takich jak hydrauliczny czas zatrzymania (HRT) (R1), sposób napowietrzania (R2) oraz stosunek ChZT/N (R3) na szybkość usuwania azotu i węgla. Efektywność usuwania ChZT we wszystkich reaktorach była wyższa niż 85%, niezależnie od spadku HRT, zmiany długości faz napowietrzania i mieszania czy wartości stosunku ChZT/N. Otrzymane w reaktorach efektywności usuwania azotu wskazują, że HRT jest parametrem operacyjnym, mającym większy wpływ na skuteczność usuwania azotu niż pozostałe czynniki. Ponadto, wyniki badań prowadzonych dla trzech różnych typów ścieków wskazują, że reaktor SBBRIA jest właściwym rozwiązaniem zarówno w warunkach wysokiej jak i niskiej dostępności donorów elektronów dla procesu heterotroficznej denitryfikacji. Dodatkowo zauważono, iż w warunkach niekorzystnego stosunku ChZT/N w reaktorze tworzą się strefy beztlenowe, w których zachodzi proces beztlenowego usuwania azotu (anammox).
    Źródło:
    Interdyscyplinarne zagadnienia w inżynierii i ochronie środowiska 6; 78-85
    9788374938976
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of biogens from synthetic wastewater by microalgae
    Autorzy:
    Zabochnicka-Świątek, M.
    Malińska, K.
    Krzywonos, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/206894.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    algae
    microorganisms
    phosphorus removal
    nitrogen removal
    synthetic wastewater
    Chlorella vulgaris
    biogens
    glony
    mikroorganizmy
    usuwanie azotu
    usuwanie fosforu
    ścieki syntetyczne
    biogeny
    Opis:
    Removal of biogens (P, N) from synthetic wastewater by microalgae Chlorella vulgaris was investigated. The study was carried out under static conditions (batch tests). Significant differences were found in the removal of nutrients by algae. The removal of biogens was >50% for ammonium ions and >80% for nitrates and phosphates. N and P removal through assimilation by microalgal C. vulgaris species can be considered an ecological alternative for current methods applied for removal of these substances from wastewater. It seems that using algae for N and P removal from wastewater can be affordable in comparison to other methods. The efficiency of biogens removal depends on the type of a biogen to be removed and the concentration of N and P in solutions. Optimization of N:P ratio can have some positive influence on the removal of biogens from wastewater by C. vulgaris.
    Źródło:
    Environment Protection Engineering; 2014, 40, 2; 87-104
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The intensified effect of nitrogen removal properties using Pseudomonas fulva K3 and MgBC for the weathered crust rare earth wastewater treatment
    Autorzy:
    Deng, Xiangyi
    Chi, Ruan
    Xiao, Chunqiao
    Zhang, Zhenyue
    Liu, Xuemei
    Hu, Jingang
    Powiązania:
    https://bibliotekanauki.pl/articles/1447385.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    weathered crust rare earth wastewater
    nitrogen removal
    pseudomonas fulva K3
    magnesium-modified biochar
    intensified effect
    Opis:
    A new bacteria named Pseudomonas fulva K3 (P. fulva) strain was isolated from the surroundings of weathered crust rare earth tailing with efficient NH4+-N removal ability via heterotrophic nitrification and aerobic denitrification. The nitrogen removal properties could be intensified by the synergistic effect between as-prepared magnesium-modified biochar (MgBC) and P. fulva strain. The results show that P. fulva exhibited a rod-shaped morphology and $NH_4+-N$ can be completely biodegraded under the optimal conditions of pH=7.0~8.0, temperature 30 oC and initial $NH_4+-N$ concentration of 100 ~150 mg/L. The $NH_4+-N$ tolerant concentration for P. fulva was determined to be 300 mg/L. The magnesium-modified biochar (MgBC) worked as an adsorbent of $NH_4+-N$. The kinetics and isotherm model for adsorption could be described by the pseudo-secondorder kinetic and Freundlich model, respectively. The XPS results showed that $NH_4+-N$ was mainly adsorbed on the surface by chemical adsorption. Furthermore, the P. fulva could be immobilized on MgBC due to its large surface area, adjusting the concentration of $NH_4+-N$ to a proper range for the growth of P. fulva by adsorption and desorption equilibrium, and leading to the intensified effect on nitrogen removal. The total nitrogen removal efficiency of the eluted weathered crust rare earth tailing reached 84.7 % in MgBC + P. fulva system.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 3; 84-96
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous removal of SO2 and NOx from sintering flue gas using ammonia-Fe(II)EDTA combined with electrolytic regeneration
    Autorzy:
    Liang, Y.
    Yao, X.
    Quin, L.
    Chen, W.
    Han, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/208117.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ammonia
    desulfurization
    flue gases
    nitrogen oxides
    nitrogen removal
    sintering sulfur dioxide
    amoniak
    odsiarczanie
    gazy odlotowe
    tlenki azotu
    usuwanie azotu
    spiekanie
    ditlenek siarki
    Opis:
    Sulfur dioxide and nitrogen oxide are health hazardous gases, which contribute to the formation of submicron acidic particulates. To reduce SO2 and NOx emission from the sintering flue gas, the combination of ammonia-Fe(II)EDTA solution scrubbing with Fe(III) electrolytic regeneration is proposed. The above method has the following advantages: direct conversion of NOx and SO2 to harmless N2 and SO4 2−, recovery of the by-product (NH4)2SO4), simultaneous removal of NOx and SO2 emission from flue gas in the reactor. The effect of the pH, initial Fe(II)EDTA concentration, and voltage on the desulfurization and denitration efficiencies was investigated using a bench-scale reactor. The maximal desulfurization and denitration efficiencies were 98% and 52%, respectively. The optimum parameters were pH ˃ 5.0, 2.1 V, and 0.05 mol·dm–3 Fe(II)EDTA concentration. SO2 and NOx removal from the sintering flue gas by ammonia-Fe(II)EDTA solution scrubbing combined with electrolytic regeneration was also demonstrated in a pilot-scale reactor.
    Źródło:
    Environment Protection Engineering; 2018, 44, 2; 19-36
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of composition of raw wastewater on removal of nitrogen compounds in multistage treatment wetlands
    Autorzy:
    Gajewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/207951.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chemicals removal
    water treatment
    biodegradation
    biological water treatment
    nitrogen
    nitrogen compounds
    nitrogen removal
    organic pollutants
    wastewater treatment
    wetlands
    biological treatment
    usuwanie chemikaliów
    uzdatnianie wody
    biodegradacja
    biologiczne oczyszczanie ścieków
    azot
    związki azotu
    usuwanie azotu
    zanieczyszczenia organiczne
    oczyszczalnia ścieków
    mokradła
    oczyszczanie biologiczne
    Opis:
    Influence of composition of raw wastewater on the efficiency of organic matter and nitrogen removal in multistage treatment wetlands has been examined. Commonly used indicators, like COD/BOD5 and BOD5/TN ratio, determining wastewater susceptibility to biodegradation in conventional treatment technologies were assessed. It was confirmed that multistage treatment wetland may be used for treatment of wastewater with high loads of organic pollutants and unfavorable composition for a biological treatment expressed by the ratio of COD/BOD5 and BOD5/TN equal to 2.7 and 0.7, respectively.
    Źródło:
    Environment Protection Engineering; 2015, 41, 3; 19-30
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient nitrate adsorption from water by aluminum powder. Kinetic, equilibrium and influence of anion competition studies
    Autorzy:
    Fakhri, Y.
    Kakavandi, B.
    Safaei, Z.
    Asadi, A.
    Mohseni, S. M.
    Golestanifar, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/208008.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aluminium compounds
    kinetic parameters
    kinetic theory
    negative ions
    nitrates
    nitrogen removal
    particle size
    związki glinu
    parametry kinetyczne
    teoria kinetyczna
    jony ujemne
    azotany
    usuwanie azotu
    rozmiar cząstek
    Opis:
    The feasibility of aluminum powder (with particle size of 75–150 μm) for nitrate removal from aqueous solutions has been investigated. Adsorption was examined in function of initial nitrate concentration, contact time, pH and influence of other interfering anions. Maximum nitrate removal occurred at equilibrium pH of 10. The kinetics of adsorption of nitrate ions was discussed based on three kinetic models, namely: the pseudo-first order, the pseudo-second order and the intraparticle diffusion model. The experimental data fitted the pseudo-second order kinetic model very well; the rate constant was 4x10–4 g/ (mg·min) at the concentration of NO3- of 100 mg/dm3. The adsorption data followed both Langmuir (R2 = 0.808) and Freundlich (R2 = 0.865) isotherms probably due to the real heterogeneous nature of the surface sites involved in the nitrate uptake. The maximum sorption capacity of aluminum powder for nitrate adsorption was found to be ca. 45.2 mg/g at room temperature. The results indicate that aluminum powder is an interesting alternative for nitrate removal from the water.
    Źródło:
    Environment Protection Engineering; 2018, 44, 3; 19-31
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of inorganic nitrogen and phosphorous compounds from two-component aqueous solutions by micellar enhanced ultrafiltration
    Autorzy:
    Górna, J.
    Majewska-Nowak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/208241.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cationic surfactants
    critical micelle concentration
    dyes
    nitrates
    nitrogen
    nitrogen removal
    phosphorus
    surface active agents
    ultrafiltration
    kationowe środki powierzchniowo czynne
    surfaktanty kationowe
    krytyczne stężenie micelarne
    barwniki
    azotany
    azot
    usuwanie azotu
    fosfor
    środki powierzchniowo czynne
    detergenty
    ultrafiltracja
    Opis:
    The micellar enhanced ultrafiltration of model aqueous solutions containing inorganic nitrogen and phosphorous compounds was studied. In the experiments, cellulose membranes of 5, 10 and 30 kDa molecular weight cut-off and cetyltrimethylammonium bromide (CTAB) as a cationic surfactant were used. The concentration of CTAB amounted to 2 and 3CMC (critical micelle concentration). The influence of surfactant concentration, membrane cut-off and operating pressure on permeate flux, as well as on nitrate and phosphate separation was evaluated. The results showed that the presence of both nitrates and phosphates caused deterioration of the retention coefficient in comparison to separation efficiency achieved for one-component solutions.
    Źródło:
    Environment Protection Engineering; 2015, 41, 2; 167-178
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biological nutrient removal using a novel five-step continuous flow activated sludge process technology
    Autorzy:
    Abualhai, S.
    Naseer, R.
    Xiwu, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/208183.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nitrogen removal
    activated sludge process
    chemical oxygen demand
    sewage
    nutrient removal
    biological processes
    nutrient concentrations
    usuwanie azotu
    chemiczne zapotrzebowanie tlenu
    ścieki
    biologiczne usuwanie składników odżywczych
    proces biologiczny
    stężenie substancji odżywczych
    metoda osadu czynnego
    proces osadu czynnego
    Opis:
    An anaerobic-anoxic/oxic (AA/O) five-tank biological process called five-step continuous flow activated sludge process (FSCFASP) was developed to force the oscillation of organic matter and nutrient concentrations in process reactors. The run scheme and schematic diagram of FSCFASP was described. The run cycle was divided into two symmetrical half cycles with eight periods during each cycle. The duration of each period was established according to biological process requirements. The optimal running times of the periods were 90, 60, 60, 30, 90, 60,6 0 and 30 min at the HRT of 16 h, air/water ratio of 35% and SRT of 21 day at the temperature range of 19-23 °C. The optimized system achieved 88.09±1.43%, 90.33±2.9%, 68.83±5.34% and 87.67±2.9% of the chemical oxygen demand, NH4+-N, TN, and TP removal efficiencies, respectively, during a 11-month operation with the effluent meeting the Chinese sewage discharge standard GB18918-2002 (level A). Simultaneous nitrification and denitrification phenomena were observed in the tank one which is important to reduce the quantity of aeration and the duration of a next anoxic state. Compared with other existing technologies, this system achieved high nitrogen and phosphorus removal without equipment of sludge and mixed liquor return. Thus, it is effective for reducing energy consumption.
    Źródło:
    Environment Protection Engineering; 2013, 39, 3; 165-184
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biological stability of water in water distribution systems. The effect of water treatment trials
    Autorzy:
    Wolska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/206902.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    water treatment
    carbon
    groundwater
    microorganisms
    nitrogen removal
    organic carbon
    surface waters
    water aeration
    water distribution systems
    water supply systems
    biological stability
    inorganic nitrogen
    uzdatnianie wody
    węgiel
    wody gruntowe
    mikroorganizmy
    usuwanie azotu
    węgiel organiczny
    wody powierzchniowe
    napowietrzanie wody
    systemy dystrybucji wody
    wodociągi
    stabilność biologiczna
    stężenie dwutlenku węgla
    azot nieorganiczny
    Opis:
    Research into the removal efficiency of biogenic substances, necessary for the growth of heterotrophic microorganisms, was carried out for the following water treatment trials: surface water, infiltrative water and mixed surface water after microsieving with aerated underground water. The results have shown that the efficiency of removal of organic substances, independently of the type of treated water, increased along with the organic carbon concentrations in raw water. The average effectiveness of phosphate removal was: 92.1%, 88.8% and 83.7% for surface, infiltrative and mixed water, respectively. In all analyzed systems, presence of phosphates was an limiting factor for the regrowth of microorganisms in the distribution system. In none of the water treatment trials, effective removal of inorganic nitrogen has been recorded.
    Źródło:
    Environment Protection Engineering; 2015, 41, 2; 147-157
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nitrogen and phosphorous removal from leachate by duckweed (Lemna minor)
    Autorzy:
    Iqbal, J.
    Baig, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/206940.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    climatic conditions
    Islamabad
    Pakistan
    Lemna minor
    nitrogen
    phosphorous
    removal
    biomass production
    uwarunkowania klimatyczne
    usuwanie biogenów
    produkcja biomasy
    azot
    fosfor
    Opis:
    Two separate experiments were conducted during the months of June and September, 2014 to investigate the nutrient (nitrogen and phosphorous) removal from leachate by growing duckweed, Lemna minor in various leachate dilutions under natural climatic conditions of Islamabad, Pakistan. The highest uptake of nitrogen and phosphorous by duckweed was 95% and 90%, respectively, whereas the highest growth rate of duckweed was 6.4 g·m–2·day–1 during both experiments. The highest rates of nitrogen and phosphorous removal from leachate media were 380 and 200 mg·m–2·day–1, respectively, during both experiments. Nutrient uptake by duckweed and its growth rate was rapid at more diluted leachate whereas the nutrient removal rates from leachate media were higher in more concentrated leachate. The duckweed growth and its nutrient uptake ability under natural climatic conditions were directly affected by seasonal climatic variations. Relatively higher temperature and more intense solar radiation were more favorable for the duckweed growth and its nutrient uptake ability. Both parameters can be improved by pre-acclimation of duckweed with leachate which prevents the lag phase of the duckweed growth.
    Źródło:
    Environment Protection Engineering; 2017, 43, 4; 123-134
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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