Mitigation of membrane biofouling by a quorum quenching bacterium for membrane bioreactors

So Young Ham, Han Shin Kim, Eunji Cha, Jeong Hoon Park, Hee-Deung Park

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)220-226
Number of pages7
JournalBioresource Technology
Volume258
DOIs
Publication statusPublished - 2018 Jun 1

Keywords

  • Biofouling
  • Enterococcus durans
  • Lactonase
  • Membrane bioreactor
  • Quorum quenching

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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