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 journalArticlepeer-review

43 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

Bibliographical note

Funding Information:
This work was supported by the Korea Ministry of the Environment “Converging Technology Project” ( 2012001440001 ), the National Research Foundation of Korea ( NRF-2016R1D1A1B03935940 ), and a grant from Korea University. We would like to thank professor Joon-Hee Lee from Pusan National University for kindly providing the RhlR reporter strains, professor Ji Hyang Kweon from Konkuk University for providing the A136 strains, and Joo Hee Chung from the Korea Basic Science Institute for performing the HPLC and ESI-MS analyses.

Funding Information:
This work was supported by the Korea Ministry of the Environment “Converging Technology Project” (2012001440001), the National Research Foundation of Korea (NRF-2016R1D1A1B03935940), and a grant from Korea University. We would like to thank professor Joon-Hee Lee from Pusan National University for kindly providing the RhlR reporter strains, professor Ji Hyang Kweon from Konkuk University for providing the A136 strains, and Joo Hee Chung from the Korea Basic Science Institute for performing the HPLC and ESI-MS analyses.

Publisher Copyright:
© 2018 Elsevier Ltd

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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