Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 121, Issue -, Pages 26-34Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2017.03.008
Keywords
Source water; Biofilm; Bacterial structure; Apparent temperature coefficient; Kinetic characteristics
Funding
- Natural Science Foundation of Zhejiang Province - China [LQ15E080012, LQ17E090002]
- National Key Technologies Research and Development Program of China [2012BAJ25B07]
- Yumiao Talent Projects of Zhejiang Ocean University [YMJH201606]
- Natural Science Foundation of Jiangsu Province [BK20150165]
- China Post-doctoral Science Foundation [2016M591832]
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The growth and accumulation of functional bacteria were limited due to the deficiency of substrates in biofilm reactors for source water pretreatment. In this study, pre-cultured biofilm (PCB) formed on different carriers was used to treat oligotrophic source water, and the kinetic characteristics and bacterial structures was evaluated under realistic conditions. Experimental results showed that PCB formed under substrate-enhanced conditions decreased substrate affinity of biofilm, but effectively improved the operation performance of biofilm reactors. In particularly, biofilm formed on elastic stereo media had the lowest apparent half-saturation coefficient (Ks) for substrates, which was more easily to accommodate oligotrophic niche. Interestingly, biodiversity of biofilm was obviously increased after long-term exposure to oligotrophic niche, and decreased functional bacteria were replaced by others with similar function. Basically, Proteobacteria and Planctomycetes were dominant in biofilm samples under both substrate-enhanced and oligotrophic conditions. (C) 2017 Elsevier Ltd. All rights reserved.
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