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

IF 0.5 4区环境科学与生态学 Q4 ENGINEERING, ENVIRONMENTAL

Environment Protection Engineering Pub Date : 2019-01-01 DOI:10.37190/epe190306

Xungang Yan, Jia-xi Zheng, Yunping Han, Jianwei Liu, Jianhui Sun

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Abstract

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 of 100%, 200%, and 300% were set up to study its influence on the denitrification process and nirS gene-containing bacteria. Results showed the removal 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.

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内循环比对厌氧/缺氧/氧(A²/O)废水处理过程中反硝化过程及含nirs细菌的影响

内循环(IR)比是厌氧/缺氧/好氧(A2O)废水处理工艺的重要运行参数。建立了3个实验室规模的A2O废水处理工艺，IR比分别为100%、200%和300%，研究其对反硝化过程和含nirS基因细菌的影响。结果表明:随着IR率从100%增加到300%，化学需氧量(COD)、氨氮(NH4-N)、总氮(TN)和总磷(TP)的去除率均有不同程度的提高。NirS基因数从1.8×108拷贝/g MLSS增加到3.2×108拷贝/g MLSS，与缺氧区反硝化速率呈正相关。此外，在不同操作模式下，含nirS基因的反硝化细菌的群落结构也存在相似性。上述结果表明，在A2O处理过程中提高IR率有利于含nirS基因的细菌，在保持系统群落结构稳定的同时，可以明显提高其反硝化能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environment Protection Engineering 环境科学-工程：环境

CiteScore

0.80

自引率

0.00%

发文量

审稿时长

12 months

期刊介绍： Water purification, wastewater treatment, water reuse, solid waste disposal, gas emission abatement, systems of water and air pollution control, soil remediation.