Backwash intensity and frequency impact the microbial community structure and function in a fixed-bed biofilm reactor

Li X.; Yuen W.; Morgenroth E.Raskin L.

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Backwash intensity and frequency impact the microbial community structure and function in a fixed-bed biofilm reactor

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Linkages among bioreactor operation and performance and microbial community structure were investigated for a fixed-bed biofilm system designed to remove perchlorate from drinking water. Perchlorate removal was monitored to evaluate reactor performance during and after the frequency and intensity of the backwash procedure were changed, while the microbial community structure was studied using clone libraries and quantitative PCR targeting the 16S rRNA gene. When backwash frequency was increased from once per month to once per day, perchlorate removal initially deteriorated and then recovered, and the relative abundance of perchlorate-reducing bacteria (PRB) initially increased and then decreased. This apparent discrepancy suggested that bacterial populations other than PRB played an indirect role in perchlorate removal, likely by consuming dissolved oxygen, a competing electron acceptor. When backwash intensity was increased, the reactor gradually lost its ability to remove perchlorate, and concurrently the relative abundance of PRB decreased. The results indicated that changes in reactor operation had a profound impact on reactor performance through altering the microbial community structure. Backwashing is an important yet poorly characterized procedure when operating fixed-bed biofilm reactors. Compared to backwash intensity, changes in backwash frequency exerted less disturbance on the microbial community in the current study. If this finding can be confirmed in future work, backwash frequency may serve as the primary parameter when optimizing backwash procedures.

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《Applied Microbiology and Biotechnology》 |2013年第3期|815-827|共13页
作者
Li X.; Yuen W.; Morgenroth E.Raskin L.;
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作者单位

Department of Civil Engineering, University of Nebraska-Lincoln, 844 N. 16th St., N117 SEC Link, Lincoln, NE 68588-6105, United States;

Department of Civil and Environmental Engineering, University of Michigan, EWRE Bldg., 1351 Beal Ave., Ann Arbor, MI 48109, United States;

Urban Water Management, Swiss Federal Institute of Technology Zürich, Dübendorf, Switzerland;

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原文格式 PDF
正文语种英语
中图分类应用微生物学;
关键词
Backwash frequency; Backwash intensity; Biofilm reactor; Microbial community; Perchlorate;

Backwash intensity and frequency impact the microbial community structure and function in a fixed-bed biofilm reactor

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