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Effect of internal recycle ratio on the denitrification process and nirS-containing bacteria of an anaerobic/anoxic/oxic (A2/O) wastewater treatment process

Treść / Zawartość
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Internal recycle (IR) ratio is an important operation parameter for the anaerobic/anoxic/oxic (A2O) wastewater treatment process. Three laboratory-scale A2O wastewater treatment processes with IR ratios 100%, 200%, and 300% were set up to study its influence on the denitrification process and nirS gene-containing bacteria. Results showed theremoval rate of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN) and total phosphorus (TP) increased at different levels as the IR rate augmented from 100% to 300%. NirS gene numbers were increased from 1.8×108 to 3.2×108 copies/g MLSS, which was positively correlated with the denitrification rate in anoxic areas. Moreover, similarities were observed in the community structures of denitrifying bacteria that contained the nirS gene under different operation modes. These results indicated that increasing the IR rate in the A2O treatment process could benefit nirS gene-containing bacteria and improve denitrification ability observably while maintaining the stability of the community structure of the system.
Rocznik
Strony
87--101
Opis fizyczny
Bibliogr. 25 poz., tab., rys.
Twórcy
autor
  • School of Environment, Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang 453007, Henan, China
autor
  • Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
autor
  • Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
autor
  • Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100085, China
autor
  • School of Environment, Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang 453007, Henan, China
Bibliografia
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  • [4] ZHOU Z.F., ZHENG Y.M., SHEN J.P., ZHANG L.M., HE J.Z., Response of denitrification genes nirS, nirK, and nosZ to irrigation water quality in a Chinese agricultural soil, Environ. Sci. Poll. R., 2011, 18 (9),1644.
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  • [6] YOU S.J., Identification of denitrifying bacteria diversity in an activated sludge system by using nitrite reductase genes, Biotech. Lett., 2005, 27 (19), 1477.
  • [7] BRAKER G., ZHOU J., WU L., DEVOL A.H., TIEDJE J.M., Nitrite reductase genes (nirK and nirS) as functional markers to investigate diversity of denitrifying bacteria in pacific northwest marine sediment communities, Appl. Environ. Microb., 2000, 66 (5), 2096.
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  • [13] WANG D.B., ZHENG W., LI X.M., YANG Q., LIAO D.X., ZENG G.M., Evaluation of the feasibility of alcohols serving as external carbon sources for biological phosphorus removal induced by the oxic/extended-idle regime, Biotech. Bioeng., 2013, 110 (3), 827.
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Uwagi
PL
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-48d14cce-7d9b-42f2-80fa-688e15ddba2b
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