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Research on the influencing factors on nitrification performance during the long-term operation in membrane aerated biofilm reactor 
Authors： CHEN Yasong1, CHENG Gang2, LIU Mengmeng1,
 SUN Wan1, WANYAN Deqing2, LIU Jiayin2, ZHANG Congcong2, QIU Yong2, HUANG Xia2
Units： 1. National Engineering Research Center of Eco-Environment in the Yangtze River Economic Belt, China Three Gorges Corporation, Wuhan 430014, China;
 2. School of Environment, Tsinghua University, Beijing 100084,China
KeyWords： membrane aerated biofilm reactor；long-term operation; ammonia nitrogen removal load; intermittent aeration; gas supply mode
ClassificationCode：TQ028； X703
year,volume(issue):pagination： 2026, 46(4):150-156

Abstract：

To investigate the long-term nitrification performance of membrane aerated biofilm reactor (MABR) in municipal wastewater treatment, a MABR system was constructed by employing surface-modified hollow fiber membranes as the membrane modules. The effects of various operational parameters - flushing mode, hydraulic retention time (HRT), membrane pressure, influent chemical oxygen demand (COD) concentration, and gas supply modes-on the ammonia nitrogen removal performance were systematically evaluated in the MABR system. The results indicated that hydraulic circulation flushing led to an increased biofilm density, which led to a reduced ammonia nitrogen removal efficiency in the long-term operation. In contrast, intermittent aeration proved to be more effective in enhancing and sustaining ammonia nitrogen removal load. Different HRT within the range of 2.8 to 5 hours had negligible impact on ammonia nitrogen removal performance. Periodic fluctuations in membrane pressure between 0 and 20 kPa promoted biofilm detachment and maintained a thinner state, thereby improving ammonia nitrogen removal; however, operating in longer term led to insufficient biomass accumulation, ultimately compromising treatment efficiency. Higher influent COD concentrations were found to inhibit ammonia nitrogen removal. Furthermore, during long-term operation, the series-connected membrane module achieved significantly higher ammonia nitrogen removal than that of parallel-connected membrane module. 

Funds：

 中国长江三峡集团公司科研项目资助（NBWL202300013）

AuthorIntro：
陈亚松（1982-），男，湖北黄石人，博士，正高级工程师，研究方向为水环境系统治理；程刚（1993-），男，湖北咸宁人，硕士，研究方向为污水资源化.*通讯作者，E-mail: xhuang@tsinghua.edu.cn

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