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- Title
Impact of oxygen on the coexistence of nitrification, denitrification, and sulfate reduction in oxygen-based membrane aerated biofilm.
- Authors
Liu, Hong; Tan, Shuying; Sheng, Zhiya; Yu, Tong; Liu, Yang
- Abstract
Membrane aerated biofilms (MABs) are subject to 'counter diffusion' of oxygen and substrates. In a membrane aerated biofilm reactor, gases (e.g., oxygen) diffuse through the membrane into the MAB, and liquid substrates pass from the bulk liquid into the MAB. This behavior can result in a unique biofilm structure in terms of microbial composition, distribution, and community activity in the MAB. Previous studies have shown simultaneous aerobic oxidation, nitrification, and denitrification within a single MAB. Using molecular techniques, we investigated the growth of sulfate-reducing bacteria (SRB) in the oxygen-based MAB attached to a flat sheet membrane. Denaturing gradient gel electrophoresis of the amplified 16S rRNA gene fragments and functional gene fragments specific for ammonia-oxidizing bacteria ( amoA), denitrifying bacteria ( nirK), and SRB ( dsrB) demonstrated the coexistence of nitrifiers, denitrifiers, and SRB communities within a single MAB. The functional diversities of SRB and denitrifiers decreased with an increase in the oxygen concentration in the bulk water of the reactor.
- Subjects
EFFECT of oxygen on bacteria; BIOFILMS; NITRIFICATION; DENITRIFICATION; REDUCTION of sulfates; SULFATE-reducing bacteria
- Publication
Canadian Journal of Microbiology, 2015, Vol 61, Issue 3, p237
- ISSN
0008-4166
- Publication type
Article
- DOI
10.1139/cjm-2014-0574