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Microbial Ecology

, Volume 79, Issue 1, pp 84–97 | Cite as

Effects of Quorum Quenching on Biofilm Metacommunity in a Membrane Bioreactor

  • So-Yeon Jeong
  • Chung-Hak Lee
  • Taewoo YiEmail author
  • Tae Gwan KimEmail author
Environmental Microbiology
  • 167 Downloads

Abstract

Quorum quenching (QQ) has received attention for the control of biofilms, e.g., biofilms that cause biofouling in membrane bioreactors (MBRs). Despite the efficacy of QQ on biofouling, it is elusive how QQ influences biofilm formation on membranes. A pilot-scale QQ-MBR and non-QQ-MBR were identically operated for 4 days and 8 days to destructively sample the membranes. QQ prolonged the membrane filterability by 43% with no harmful influence on MBR performance. qPCR showed no effect of QQ on microbial density during either of these time periods. Community comparisons revealed that QQ influenced the bacterial and fungal community structures, and the fungal structure corresponded with the bacterial structure. Metacommunity and spatial analyses showed that QQ induced structural variation rather than compositional variation of bacteria and fungi. Moreover, QQ considerably enhanced the bacterial dispersal across membrane during the early development. As the dispersal enhancement by QQ counteracted the ecological drift, it eliminated the distance–decay relationship, reflecting a neutral theory archetype of metacommunity. Network analyses showed that QQ substantially reduced the amount and magnitude of interactions, e.g., competition and cooperation, for bacteria and fungi, and weakened their network structures, irrespective of time. Additionally, QQ suppressed the growth of specific microbial species (e.g., Acinetobacter), abundant and widespread at the early stage. These findings suggest that QQ influenced the community dynamics at the regional and local levels, correspondingly the ecological selection and dispersal processes, during the biofilm development.

Keywords

Metacommunity Biofilm Quorum quenching Biofouling Membrane bioreactor 

Notes

Funding Information

This study was supported by the basic science research program through the National Research Foundation of Korea funded by the Ministry of Education (2018R1D1A1B07048872).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

248_2019_1397_MOESM1_ESM.pdf (399 kb)
ESM 1 (PDF 398 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of MicrobiologyPusan National UniversityPusanRepublic of Korea
  2. 2.School of Chemical and Biological EngineeringSeoul National UniversitySeoulRepublic of Korea
  3. 3.National Institute of EcologySeocheonRepublic of Korea

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