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| Study on the effect of online cleaning with NaClO on CE-HLMBR operation |
| WANG Wen-chao1,2, HE Cong-hui1, XU Heng2, FANG Kuo1, GAO Fang3, XUE Xiao-fei3, LIU Mu4, SUN Kai4, WANG Kai-jun1 |
1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;
2. School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
3. Beijing Enterprises Water Group(China) Investment Limited, Beijing 100102, China;
4. GreenTech Environmental Co., Ltd, Beijing 100102, China |
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Abstract In an already built chemically enhanced high load membrane bioreactor (CE-HLMBR), NaClO online cleaning strategy was applied. The impacts on filtration resistance, effluent quality and sludge characteristics were evaluated. Results indicated that NaClO online cleaning could remove the chemical cake layer as well as recover the filtration resistance efficiently. At different stages of resistance growth, the filtration resistance after cleaning could be recovered to a similar level (less than 5×1012m-1). In terms of effluent quality, the concentration of chemical oxygen demand (COD) increased after NaClO cleaning (from 6.3mg/L to 28.16mg/L), which was caused by the release and the increased permeability of dissolved organic matter (DOM). However, it had little impact on the removal of total phosphorus (TP) and ammonium. What’s more, after 12h of cleaning, the particle size distribution and nitrification activity of the sludge were basically unchanged, but the concentration of EPS increased significantly, which was supposed to cause changes in the structure of reversible membrane fouling.
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Received: 04 July 2022
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