摘要
在已构建的化学强化高负荷膜生物反应器(CE-HLMBR)中执行NaClO在线清洗策略,考察其对过滤阻力、系统产水水质及污泥性质等几方面的影响.结果表明,NaClO在线清洗可以破坏化学滤饼层,有效恢复过滤阻力,在不同的阻力增长阶段,清洗后的过滤阻力可恢复至相近水平(低于5×10^(12)m^(-1));在产水水质方面,NaClO清洗后溶解性有机物(DOM)的释放及透过性的增加会造成产水化学需氧量(COD)的升高(由6.3mg/L上升至28.16mg/L),但几乎不影响系统对总磷(TP)和氨氮的去除效果;清洗12h后,污泥粒度分布和硝化活性与清洗前基本一致,但EPS的分泌明显增加,这会引起膜可逆污染结构变化.
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 5×10^(12)m^(-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.
作者
王文超
贺聪慧
徐恒
房阔
高放
薛晓飞
刘牡
孙凯
王凯军
WANG Wen-chao;HE Cong-hui;XU Heng;FANG Kuo;GAO Fang;XUE Xiao-fei;LIU Mu;SUN Kai;WANG Kai-jun(State Key Joint Laboratory of Environmental Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China;School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Beijing Enterprises Water Group(China)Investment Limited,Beijing 100102,China;GreenTech Environmental Co.,Ltd,Beijing 100102,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第2期638-647,共10页
China Environmental Science
关键词
长期运行
高负荷膜生物反应器
膜污染
在线清洗
化学强化
long term operation
high load membrane bioreactor
membrane fouling
online cleaning
Chemically enhanced backwashing
