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《Environmental Science & Technology》 2013-S1
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Applications of Circular Cleaning in Off-line Chemical Cleaning for Membrane Bioreactors

LIU Ji-cheng1,CHEN Chun-sheng1,WEN Jian-ping1,DAI Ri-cheng1,LIU Xin-yu1,XU Rong-le2(1.Engineering and Technology Center of Membrane Bioreactors and Wastewater Reuse,Beijing Origin Water Environmental Technology Co.,Ltd,Beijing 102206,China;2.Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)  
According to low efficiency of the off-line chemical cleaning in conventional MBR,In this paper,engineering research with offline circular cleaning was carried out.It was found that compared with static soaking,circular cleaning could enhance the reaction rate between chemical and foulant,reduce the chemical consumption,and the reaction time could be reduced 50%.The cleaning efficiency could be enhanced under appropriate intermittent aeration,the adequate aeration intensity was 20N m3/(m2.h).Heating chemical to 25 ℃ is another way to enhance permeability and improve cleaning efficiency.Through the on-line monitor of pH,the addition quantity of sodium hypochlorite and citric acid could be calculated,contrast with estimation,the waste of chemical was reduced.
【Fund】: 北京市门头沟区科技创新项目(20120304)
【CateGory Index】: X703.1
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