Specific location of encapsulated quorum quenching bacteria for biofouling control in an external submerged membrane bioreactor

Daniyal Jahangir, Hyun Suk Oh, Sang Ryoung Kim, Pyung Kyu Park, Chung Hak Lee, Jung Kee Lee

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

A number of recent studies have demonstrated that quorum sensing (QS) using signal molecules, N-acyl homoserine lactone (AHL), plays a role in the formation of biofilm on the surface of membranes in a membrane bioreactor (MBR). In this study, the membrane biofouling in an external submerged MBR was inhibited by interrupting AHL-mediated QS with quorum quenching bacteria encapsulated inside the porous vessel (microbial-vessel). The quorum quenching effect of the microbial-vessel was more pronounced when the microbial-vessel was positioned nearer to the filtration membrane in MBR, i.e., in the membrane tank rather than in the bioreactor. Its quorum quenching effect was also largely dependent on the recirculation rate of the mixed liquor between the bioreactor and the membrane tank. The microbial-vessel maintained its quorum quenching activity steadily over 100. days of the MBR operation due to continuous regeneration of living quorum quenching bacteria inside the microbial-vessel. This strategy effectively interrupted cell-to-cell communications (quorum sensing), and thereby exhibited energy saving potential by reducing the aeration rate in MBR.

Original languageEnglish
Pages (from-to)130-136
Number of pages7
JournalJournal of Membrane Science
Volume411-412
DOIs
Publication statusPublished - 2012 Sep 1

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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