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    Membrane fouling in anoxic/oxic membrane reactors coupled with carrier-enhanced anaerobic side-stream reactor: Effects of anaerobic hydraulic retention time and mechanism insights

    Year: 2021

    Journal: J. Membr. Sci., Volume 637, NOV 1

    Authors: Shao, Yanjun; Zhou, Zhen; Jiang, Jie; Jiang, Lu-Man; Huang, Jianping; Zuo, Yi; Ren, Yuqing; Zhao, Xiaodan

    Organizations: National Natural Science Foundation of China [51878403]; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [TP2020067]; Science and Technology Commission of Shanghai Mu-nicipality of China [19DZ1204904]

    Keywords: Anaerobic side-stream reactor; Membrane fouling; Sludge reduction; Membrane bioreactor; Hydraulic retention time

    Membrane fouling mechanism of membrane reactors (MBR) coupled with anaerobic side-stream reactor (ASSR) has been extensively studied, while the homologous mechanism in carrier-enhanced ASSR process remained unclear. Anoxic/oxic MBR and three carrier-enhanced ASSR coupled anoxic/oxic MBRs (ASSR-MBRs) were operated in parallel to investigate the effect of hydraulic retention time of ASSR (HRTSR) on membrane filtration performance and fouling tendency. ASSR-MBR with HRTSR of 2.5, 5.0 and 6.7 h achieved the sludge reduction efficiency of 24.6%, 32.2%, and 41.0%. The foulant layer resistances were in the order of anoxic/oxic MBR (5.40 +/- 0.32 x 10(12) m(-1)) > ASSR2.5-MBR (5.39 +/- 0.30 x 10(12) m(-1)) > ASSR6.7-MBR (3.33 +/- 0.42 x 10(12) m(-1)) > ASSR5.0-MBR (2.38 +/- 0.45 x 10(12) m(-1)). The improved sludge dewaterability and more stable sludge structure in carrier-enhanced ASSR caused membrane fouling less severe than that in anoxic/oxic MBR. The results of extracellular polymeric substances identified incomplete and over hydrolysis of cell lysate at HRTSR of 2.5 and 6.7 h, respectively. CLSM results indicated that ASSR-MBR with HRTSR of 5.0 h achieved the best filtration performance because of the enhanced protein degradation ability of membrane surface microbes. MiSeq sequencing indicated that fouling-eased group bacteria (responsible for the alleviation of membrane fouling) were enriched in ASSR-MBRs, while fouling-caused group bacteria (responsible for the aggravation of membrane fouling), such as filamentous bacteria, were dominant in anoxic/oxic MBR. This study bridged a gap between sludge redcution and membrane fouling in carrier-enhanced ASSR-MBR.
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