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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2005, Vol. 6 Issue ( 5): 21-    DOI: 10.1631/jzus.2005.B0427
    
Biomass and microbial activity in a biofilter during backwashing*
BAI Yu, ZHANG Jie, LI Yi-fan, GAO Yu-nan, LI Yong
Beijing Drainage Group Limited Company, Beijing 100061, China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; School of Environmental Engineering, Nanyang Technological University, 639798, Singapore
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Abstract  Biomass and microbial activity in backwashing processes of a biofilter for tertiary treatment were investigated. The microbial groups revealed new distribution along the biofilter depth after low flow rate backwashing for a short time. Then the start-up process was accelerated by backwashing. The biomass profile and microbial activity profile both varying with depth before and after backwashing, can be mathematically described by quadratic equations. Using the profiles, the difference of oxygen demand can be calculated to determine the airflow rate during backwashing. Combined with the difference between biofilters and rapid gravity filters, analysis of biomass and microbial activity can determine more accurately the required airflow rate during backwashing.

Key words： Municipal and Environmental Engineering Biofilter      Backwashing      Biomass      Microbial activity      Oxygen demand     
Received: 13 August 2004     
CLC:  Q93  
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BAI Yu
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BAI Yu, ZHANG Jie, LI Yi-fan, GAO Yu-nan, LI Yong. Biomass and microbial activity in a biofilter during backwashing*. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 21-.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.2005.B0427     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2005/V6/I 5/21

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