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http://dx.doi.org/10.4014/jmb.1604.04070

Effects of Quorum Quenching on the Microbial Community of Biofilm in an Anoxic/Oxic MBR for Wastewater Treatment  

Jo, Sung Jun (School of Chemical and Biological Engineering, Seoul National University)
Kwon, Hyeokpil (School of Chemical and Biological Engineering, Seoul National University)
Jeong, So-Yeon (Department of Microbiology, Pusan National University)
Lee, Sang Hyun (School of Chemical and Biological Engineering, Seoul National University)
Oh, Hyun-Suk (School of Chemical and Biological Engineering, Seoul National University)
Yi, Taewoo (Division of Ecosystem Service and Research Planning, National Institute of Ecology)
Lee, Chung-Hak (School of Chemical and Biological Engineering, Seoul National University)
Kim, Tae Gwan (Department of Microbiology, Pusan National University)
Publication Information
Journal of Microbiology and Biotechnology / v.26, no.9, 2016 , pp. 1593-1604 More about this Journal
Abstract
Recently, bacterial quorum quenching (QQ) has been proven to have potential as an innovative approach for biofouling control in membrane bioreactors (MBRs) for advanced wastewater treatment. Although information regarding the microbial community is crucial for the development of QQ strategies, little information exists on the microbial ecology in QQ-MBRs. In this study, the microbial communities of biofilm were investigated in relation to the effect of QQ on anoxic/oxic MBRs. Two laboratory-scale MBRs were operated with and without QQ-beads (QQ-bacteria entrapped in beads). The transmembrane pressure increase in the QQ-MBRs was delayed by approximately 100-110% compared with conventional- and vacant-MBRs (beads without QQ-bacteria) at 45 kPa. In terms of the microbial community, QQ gradually favored the development of a diverse and even community. QQ had an effect on both the bacterial composition and change rate of the bacterial composition. Proteobacteria and Bacteroidetes were the most dominant phyla in the biofilm, and the average relative composition of Proteobacteria was low in the QQ-MBR. Thiothrix sp. was the dominant bacterium in the biofilm. The relative composition of Thiothrix sp. was low in the QQ-MBR. These findings provide useful information that can inform the development of a new QQ strategy.
Keywords
Membrane bioreactor; biofouling; biofilm; quorum sensing; quorum quenching; microbial community;
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