Membrane fouling characteristics of PVDF membrane and nylon mesh in Anammox-MBRs
LIU Qing-hua, ZHU Yi-jing, CAO Li-juan, WANG Jun-jie, WANG Ya-yi
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
PVDF membrane was used in the early operation period (1~129d) and nylon mesh was used in the later operation period (220~360d) to analyze the nitrogen removal performance and membrane fouling characteristics of the two kind of membrane bioreactor (MBR) system. The MBR system was operated stably for 112d with the influent NH4+-N and NO2--N concentrations of 400~740mg/L and 460~790mg/L, respectively. During this period, the total nitrogen removal efficiency (TNRE) maintained at about 86%, and the nitrogen removal rate (NRR) was 0.61~1.08kg N/(m3·d). After 263days' operation, mixed liquid suspended solids (MLSS) in the reactor increased from 4918mg/L to 7230mg/L, and the corresponding mixed liquor suspended solids (MLVSS) increased from 2585mg/L to 4455mg/L, the highest special anammox activity (SAA) was 0.46g N/(d·g VSS). For both PVDF membrane or nylon mesh, the cake layer resistance dominates at the end of a membrane fouling cycle, but their fouling mechanisms was different. Compared with that of PVDF membrane system, nylon mesh maintained good anti-fouling performance, even operated under the same HRT to PVDF membrane. Considering the nitrogen removal performance and the membrane fouling cycle, nylon mesh with HRT=1.5h was preferred in this experiment.
刘清华, 朱奕静, 曹丽娟, 王俊杰, 王亚宜. 膜生物反应器PVDF膜和尼龙膜污染特性[J]. 中国环境科学, 2020, 40(3): 1089-1096.
LIU Qing-hua, ZHU Yi-jing, CAO Li-juan, WANG Jun-jie, WANG Ya-yi. Membrane fouling characteristics of PVDF membrane and nylon mesh in Anammox-MBRs. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 1089-1096.
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