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

• Autorzy: Yan Xu , Zheng Jiaxi , Han Yunping , Liu Jianwei , Sun Jianhui

Identyfikatory

DOI

10.5277/epe190306

• 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.

Słowa kluczowe

EN

COD; wastewater treatment; denitrification process; internal recycle

PL

ChZT; oczyszczanie ścieków; proces denitryfikacji; recykling wewnętrzny

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2019
• Tom: Vol. 45, nr 3
• Strony: 87--101
• Opis fizyczny: Bibliogr. 25 poz., tab., rys.

Twórcy

autor

Yan Xu

• 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

Zheng Jiaxi

• Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

autor

Han Yunping

• Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

autor

Liu Jianwei

• Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100085, China

autor

Sun Jianhui

• 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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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).