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Enhancing biofilm formation in the hydrogen-based membrane biofilm reactor through bacterial Acyl-homoserine lactones
The slow growth rate of autotrophic bacteria and regulation of biofilm thickness are critical factors that limit the development of a hydrogen-based membrane biofilm reactor (H2-MBfR). The acyl-homoserine lactone (AHL) mediated quorum sensing (QS) system is a crucial mechanism regulating biofilm behavior. However, the AHLs that promote biofilm formation in autotrophic denitrification systems and their underlying mechanisms, remain unclear. This study explored the impact of AHL-mediated QS signaling molecules on biofilm development in H2-MBfR. This study revealed that C14-HSL and C4-HSL are potential signaling molecules that enhanced biofilm formation in long-term stable operating H2-MBfR. Subsequent short-term experiments with C14-HSL and C4-HSL confirmed their ability to increase bacterial adhesion to carrier surfaces by promoting the production of extracellular polymeric substances (EPS). Functional gene annotation indicated that exogenous C14-HSL and C4-HSL increased the abundance of signal transduction (increased by 0.250%–0.375%), strengthening the inter bacterial QS response while enhancing cell motility (increased by 0.24% and 0.21%, respectively) and biological adhesion (increased by 0.044% and 0.020%, respectively), thereby accelerating the initial bacterial attachment to hollow fiber membranes and facilitating biofilm development. These findings contribute to the understanding of microbial community interactions in H2-MBfRs and provide novel approaches for biofilm management in wastewater treatment systems.
Enhancing biofilm formation in the hydrogen-based membrane biofilm reactor through bacterial Acyl-homoserine lactones
The slow growth rate of autotrophic bacteria and regulation of biofilm thickness are critical factors that limit the development of a hydrogen-based membrane biofilm reactor (H2-MBfR). The acyl-homoserine lactone (AHL) mediated quorum sensing (QS) system is a crucial mechanism regulating biofilm behavior. However, the AHLs that promote biofilm formation in autotrophic denitrification systems and their underlying mechanisms, remain unclear. This study explored the impact of AHL-mediated QS signaling molecules on biofilm development in H2-MBfR. This study revealed that C14-HSL and C4-HSL are potential signaling molecules that enhanced biofilm formation in long-term stable operating H2-MBfR. Subsequent short-term experiments with C14-HSL and C4-HSL confirmed their ability to increase bacterial adhesion to carrier surfaces by promoting the production of extracellular polymeric substances (EPS). Functional gene annotation indicated that exogenous C14-HSL and C4-HSL increased the abundance of signal transduction (increased by 0.250%–0.375%), strengthening the inter bacterial QS response while enhancing cell motility (increased by 0.24% and 0.21%, respectively) and biological adhesion (increased by 0.044% and 0.020%, respectively), thereby accelerating the initial bacterial attachment to hollow fiber membranes and facilitating biofilm development. These findings contribute to the understanding of microbial community interactions in H2-MBfRs and provide novel approaches for biofilm management in wastewater treatment systems.
Enhancing biofilm formation in the hydrogen-based membrane biofilm reactor through bacterial Acyl-homoserine lactones
Front. Environ. Sci. Eng.
Chen, Yuchao (author) / Dong, Kun (author) / Zhang, Yiming (author) / Zheng, Junjian (author) / Jiang, Minmin (author) / Wang, Dunqiu (author) / Zhang, Xuehong (author) / Huang, Xiaowu (author) / Zhou, Lijie (author) / Li, Haixiang (author)
2024-11-01
Article (Journal)
Electronic Resource
English
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