Anti-Biofouling Performance of an Immobilized Indigenous Quorum Quenching Bacterium Bacillus cereus HG10 and Its Influence on the Microbial Community in a Bioreactor

Fangfang Xu, Chang Zhao, Chuang Hak Lee, Wenzhao Wang and Qiyong Xu
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Fangfang Xu: College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518055, China
Chang Zhao: Shenzhen Engineering Laboratory for Recycled Eco-efficient Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, Xili University Town, Shenzhen 518055, China
Chuang Hak Lee: Fairylands Environmental Sci-Tech (Shenzhen) Crop. Ltd., Shenzhen 518055, China
Wenzhao Wang: Shenzhen Engineering Laboratory for Recycled Eco-efficient Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, Xili University Town, Shenzhen 518055, China
Qiyong Xu: Shenzhen Engineering Laboratory for Recycled Eco-efficient Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, Xili University Town, Shenzhen 518055, China

IJERPH, 2019, vol. 16, issue 19, 1-16

Abstract: Quorum quenching-membrane bioreactors (QQ-MBRs) have been studied widely in recent decades. However, limited information is known about the influence of QQ on the microbial community. In this study, the indigenous QQ bacterium Bacillus cereus HG10 was immobilized and used to control biofouling in a bioreactor. QQ beads caused extracellular polymeric substance reduction and significantly hindered biofilm formation on a submerged membrane. Community profiling of 16S rRNA gene amplicons revealed that QQ beads dramatically altered the bacterial community structure in activated sludge but not in biofilm. Bacterial structure in the presence of QQ beads showed a clear divergence from that of the control groups at phylum, class, order, family, and genus taxonomic ranks. A significant enrichment of several bacterial genera, including Acinetobacter , Aeromonas , Delftia , Bacillus , and Pseudomonas , and depletion of over 12 bacterial genera were observed. These findings would contribute to a better understanding of why and how immobilized QQ bacteria impair membrane biofouling in QQ-MBRs.

Keywords: Bacillus cereus; biofouling; quorum quenching; 16S rRNA gene profiling (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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