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Research on Operation Efficiency and Membrane Fouling of A2/O-MBR in Reclaimed Water Treatment

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Key Laboratory of Urban Stormwater System & Water Environment of MOE, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
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National Demonstration Center for Experimental Water Environment Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
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The Logistic Service Group, Beijing Language and Culture University, Beijing 100083, China
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China Railway Construction Group Co., Ltd., Beijing 100040, China
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(12), 172; https://doi.org/10.3390/membranes9120172
Received: 6 October 2019 / Revised: 10 December 2019 / Accepted: 12 December 2019 / Published: 17 December 2019
(This article belongs to the Section Membrane Engineering and Applications)
Taking the public building domestic wastewater as an example, the combination of the MBR (membrane bioreactor) process and the traditional A2/O (anaerobic-anoxic-oxic) process was established and analyzed in terms of the removal effect of the pollutants, the impact of the microbial community changes on the process, the MBR membrane fouling, the cleaning methods, and the cleaning performance. The results indicated that the effluent water quality of the domestic wastewater treated with the A2/O-MBR process was stable and met the emission requirement to the natural water body. There was good microbial diversity in raw water, the anaerobic tank, the anoxic tank, the aerobic MBR tank and the disinfection tank, and the aerobic MBR tank has a wide variety of aerobic microorganisms, which elevates the removal of organics and the nitrification of ammonia nitrogen and ensures the qualification of nitrogen and phosphorus indexes of the system effluent water. For the fouled membrane, the surface of the contaminated membrane was covered by macromolecular contaminants, causing the membrane flux to drop, and after different cleaning methods to the membrane were compared, it was discovered that the combined use of cleaning agents had better effects than the single ones, and the cleaning method of sodium hydroxide followed by hydrochloric acid showed the best effect, achieving a membrane flux restoration ratio above 80% after cleaning. View Full-Text
Keywords: A2/O-MBR; reclaimed water; operation efficiency; membrane; fouling A2/O-MBR; reclaimed water; operation efficiency; membrane; fouling
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MDPI and ACS Style

Li, F.; An, X.; Feng, C.; Kang, J.; Wang, J.; Yu, H. Research on Operation Efficiency and Membrane Fouling of A2/O-MBR in Reclaimed Water Treatment. Membranes 2019, 9, 172.

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