SUNXiao,JIANGJie,WANGQiang,et al.Effect of Suspended Carrier on Microbial Community in A2O System in a Full-scale Wastewater Treatment Plant[J].China Water & Wastewater,2022,38(7):63-68.
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Effect of Suspended Carrier on Microbial Community in A2O System in a Full-scale Wastewater Treatment Plant

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第7期 Page: 63-68 Column: Date of publication: 2022-04-01
Author(s):
SUN　Xiao1;  JIANG　Jie2;  WANG　Qiang3;  REN　Jun1;  YANG　A-ming1;  ZHANG Yi-feng4;  ZHAO　Xiao-dan2;  ZHOU　Zhen2
（1. Shanghai Fudan Water Engineering Technology Co. Ltd.， Shanghai 200433， China； 2. College of Environmental and Chemical Engineering， Shanghai University of Electric Power， Shanghai 200090， China； 3. Shanghai Fengxian West Sewage Treatment Co. Ltd.， Shanghai 201424， China； 4. Bailonggang Sewage Treatment Plant， Shanghai Chengtou Sewage Treatment Co. Ltd.， Shanghai 201203， China）
Keywords:
municipal wastewater;  suspended carrier;  moving bed biofilm reactor;  A2O process;  biological nitrogen removal;  microbial community
Abstract:
The moving bed biofilm reactor (MBBR) and conventional anaerobic/anoxic/aerobic (A2O) coupling process were applied to upgrade a wastewater treatment plant in Shanghai. The nitrogen removal efficiency was improved by adding suspended carriers in the anoxic and aerobic tanks of the original A2O process, and the effluent quality was required to meet the first level A criteria specified in the national discharge standard. After half a year, the nitrification and denitrification efficiencies of activated sludge in A2O-MBBR system and A2O system were measured respectively, and it was found that the nitrification rate and denitrification rate of the former were 1.63 times and 1.65 times of the latter, respectively. In addition, the suspended carriers of aerobic tank in A2O-MBBR system increased the nitrification rate by one time. The microbial community of the system was analyzed by high-throughput sequencing. The dominant classes were Acidobacteria (16.69%), Betaproteobacteria (14.04%) and Gammaproteobacteria (11.61%), and the dominant genera were Candidatus_Microthrix (7.30%), norank_f__Saprospiraceae (4.25%) and Flavobacterium (3.01%). The microbial communities of the two processes were analyzed by LEfSe linear discriminant analysis. It was found that a large number of functional bacteria with denitrification ability were enriched in the A2O-MBBR system, and the nitrification and denitrification were enhanced by the suspended carriers.
Last Update: 2022-04-01