| Autor: |
Chen, Yuchao, Dong, Kun, Zhang, Yiming, Zheng, Junjian, Jiang, Minmin, Wang, Dunqiu, Zhang, Xuehong, Huang, Xiaowu, Zhou, Lijie, Li, Haixiang |
| Zdroj: |
Frontiers of Environmental Science & Engineering; Nov2024, Vol. 18 Issue 11, p1-13, 13p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink