Effect of high organic load shock on the performance and membrane fouling of membrane bioreactor with suspended carriers
ZHU Yi-zhou1,2, LI Xiu-fen1,2, WANG Xin-hua1,2, REN Yue-ping1,2
1. Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China;
2. Water Treatment Tech-nology and Material Collaborative Innovation Center in Jiangsu Province, Suzhou 215009, China
Regarding the changing nature of the organic load in decentralized rural wastewater, the ability of the anaerobic-anoxic-aerobic membrane bioreactor (A2O-MBR) with suspended carriers to resist the high organic load shock was studied. The effects of high organic load shock on the pollutant removal, properties of suspended and attached sludge as well as membrane fouling were investigated. The results showed that the pollutant removal was stable during high load shock. The removal rate of ammonia nitrogen decreased from 99.1% to 78.5% on the third day after the shock, and the ammonia nitrogen concentration in the effluent was higher than 5mg/L. Then the removal rate of ammonia nitrogen recovered back to 97.6%. The adenosine triphosphate (ATP) content of suspended and attached microorganisms, the attached biomass and the content of extracellular polymer (EPS) increased. The membrane fouling became more serious, and EPS content of the membrane-fouling layer was increased significantly during the shock period. The solar-powered A2O-MBR system can cut down 10% of carbon emissions.
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ZHU Yi-zhou, LI Xiu-fen, WANG Xin-hua, REN Yue-ping. Effect of high organic load shock on the performance and membrane fouling of membrane bioreactor with suspended carriers. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1985-1992.
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