文献类型：期刊文献

英文题名：Comparison of nitrogen removal efficiency and microbial characteristics of modified two-stage A/O, A2/O and SBR processes

作者：Chen, Xiurong[1];Wei, Xiao[1];Yang, Yingying[1];Wang, Shanshan[1];Lu, Quanlin[1];Wang, Yuan[1];Li, Qiuyue[1];Wang, Shuoyuan[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Natl Engn Lab High Concentrat Refractory Organ Wa, Shanghai 200237, Peoples R China

年份：2021

卷号：43

期号：11

起止页码：4687

外文期刊名：ENVIRONMENTAL GEOCHEMISTRY AND HEALTH

收录：;EI(收录号：20242616383546);WOS:【SCI-EXPANDED(收录号:WOS:000648397300001)】；

基金：This research was supported by the National Natural Science Foundation (No. 51878287)

语种：英文

外文关键词：Biofilm module; Low temperature; Nitrogen removal efficiency; Microbial characteristics; Modified two-stage a; o

摘要：The low temperature of sewage in north China results in low performance of biological treatment at municipal wastewater treatment plants (MWTPs), especially in biological nitrogen removal. A modified two-stage A/O process with an embedded biofilm was proposed to enhance nitrogen removal. The operation performance of a pilot test was compared with an A(2)/O and SBR process at existing MWTPs to investigate the resistance to low temperature. The microbial communities for the three processes were compared based on the metagenomics results of 16sDNA high-throughput sequencing from activated sludge. The modified A/O resulted in a higher average removal of COD (90.12%) than A(2)/O (85.23%) and SBR (83.03%), especially of small-molecule organic compounds (< 500 Da) and macromolecular refractory organics (> 5 k Da); the TN removal rate of A2/O, SBR and the modified A/O was also increased from 74.47%, 70.63% and 78.46%, respectively. High-throughput sequencing revealed increased microbial diversity and an abundance of denitrifying functional bacteria was observed in the modified A/O process at low temperatures. The abundance of nitrite oxidation bacteria (NOB) including Nitrosomonas and Nitrospira, the amount was 1.76% and 2.34% in modified A/O, respectively, whereas NOB only accounted for 1.82% in A(2)/O and 1.35% in SBR.