Journal
BIORESOURCE TECHNOLOGY
Volume 258, Issue -, Pages 220-226Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.03.007
Keywords
Quorum quenching; Biofouling; Enterococcus durans; Lactonase; Membrane bioreactor
Funding
- Korea Ministry of the Environment [2012001440001]
- National Research Foundation of Korea [NRF-2016R1D1A1B03935940]
- Korea University
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In this study, a quorum-quenching (QQ) bacterium named HEMM-1 was isolated at a membrane bioreactor (MBR) plant. HEMM-1 has diplococcal morphology and 99% sequence identity to Enterococcus species. The HEMM-1 cell-free supernatant (CFS) showed higher QQ activities than the CFS of other QQ bacteria, mostly by degrading N-acyl homoserine lactones (AHLs) with short acyl chains. Instrumental analyses revealed that HEMM-1 CFS degraded AHLs via lactonase activity. Under static, flow, and shear conditions, the HEMM-1 CFS was effective in reducing bacterial and activated-sludge biofilms formed on membrane surfaces. In conclusion, the HEMM-1 isolate is a QQ bacterium applicable to the control of biofouling in MBRs via inhibition of biofilm formation on membrane surfaces.
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