Photolytic quorum quenching effects on the microbial communities and functional gene expressions in membrane bioreactors

Zhang, Xiaolei; Park, Hyeona; Park, Yeong-Jun; Lee, Kibaek; Yu, Hui; Shin, Jae‐Ho; Choo, Kwang‐Ho

doi:10.1016/j.scitotenv.2021.152017

Cited by 4 publications

(2 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the abundance of QS microorganisms in the mixed liquor has been commonly observed to decrease (Table S7 and Figure c). QQ was observed to decrease the abundance of AHL-based-QS bacteria (e.g., Gram-negative bacteria including Aeromonas ) and AI-2-regulated bacteria (e.g., f_Christensenellaceae , Hyphomicrobium , Leucobacter , Microbacterium ) of mixed liquor in MBRs. ,,,, The expression of QS functional genes (e.g., AHLs-based QS genes and AIP-based QS genes) is also suppressed in MBRs in the presence of QQ, leading to less hydrophobic components of EPS in mixed liquor and thus better membrane filtration performance (due to a low hydrophobic interaction between EPS and hydrophobic membranes). ,, As a result, QQ significantly alters the biofouling-forming community in the mixed liquor. From a perspective of long-term observation, the microorganisms with highly robust signal transduction systems could become dominant to counteract the effects of QQ and be the ultimate cause of biofouling …”

Section: Qq Microorganisms and Qq Mediamentioning

confidence: 99%

“…QQ was observed to decrease the abundance of AHLbased-QS bacteria (e.g., Gram-negative bacteria including Aeromonas) and AI-2-regulated bacteria (e.g., f_Christensenellaceae, Hyphomicrobium, Leucobacter, Microbacterium) of mixed liquor in MBRs. 10,34,48,162,163 The expression of QS functional genes (e.g., AHLs-based QS genes and AIP-based QS genes) is also suppressed in MBRs in the presence of QQ, 164 leading to less hydrophobic components of EPS in mixed liquor and thus better membrane filtration performance (due to a low hydrophobic interaction between EPS and hydrophobic membranes). 34,142,165 As a result, QQ significantly alters the biofouling-forming community in the mixed liquor.…”

Section: Environmentalmentioning

confidence: 99%

See 1 more Smart Citation

Quorum Quenching in Membrane Bioreactors for Fouling Retardation: Complexity Provides Opportunities

Xu,

Su,

Yang

et al. 2024

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

The occurrence of biofouling restricts the widespread application of membrane bioreactors (MBRs) in wastewater treatment. Regulation of quorum sensing (QS) is a promising approach to control biofouling in MBRs, yet the underlying mechanisms are complex and remain to be illustrated. A fundamental understanding of the relationship between QS and membrane biofouling in MBRs is lacking, which hampers the development and application of quorum quenching (QQ) techniques in MBRs (QQMBRs). While many QQ microorganisms have been isolated thus far, critical criteria for selecting desirable QQ microorganisms are still missing. Furthermore, there are inconsistent results regarding the QQ lifecycle and the effects of QQ on the physicochemical characteristics and microbial communities of the mixed liquor and biofouling assemblages in QQMBRs, which might result in unreliable and inefficient QQ applications. This review aims to comprehensively summarize timely QQ research and highlight the important yet often ignored perspectives of QQ for biofouling control in MBRs. We consider what this "information" can and cannot tell us and explore its values in addressing specific and important questions in QQMBRs. Herein, we first examine current analytical methods of QS signals and discuss the critical roles of QS in fouling-forming microorganisms in MBRs, which are the cornerstones for the development of QQ technologies. To achieve targeting QQ strategies in MBRs, we propose the substrate specificity and degradation capability of isolated QQ microorganisms and the surface area and pore structures of QQ media as the critical criteria to select desirable functional microbes and media, respectively. To validate the biofouling retardation efficiency, we further specify the QQ effects on the physicochemical properties, microbial community composition, and succession of mixed liquor and biofouling assemblages in MBRs. Finally, we provide scale-up considerations of QQMBRs in terms of the debated QQ lifecycle, practical synergistic strategies, and the potential cost savings of MBRs. This review presents the limitations of classic QS/QQ hypotheses in MBRs, advances the understanding of the role of QS/QQ in biofouling development/retardation in MBRs, and builds a bridge between the fundamental understandings and practical applications of QQ technology.

show abstract