Abstract
The investigation aimed at revealing the N-acyl-homoserine lactone (AHL)-mediated quorum sensing (QS) of aerobic granular sludge (AGS) system in a membrane bioreactor (MBR) with internal circulation. During the experimental period, the MBR was operated under a continuous-flow mode, in which, AGS was cultivated directly. The specific AHL molecules were determined and the correlation between the AHL-mediated QS, extracellular polymeric substance (EPS) production and microbial community was explored. Two kinds of specific signaling molecule, N-octanoyl-dl- homoserine lactone (C8-HSL) and N-tetradecanoyl-dl-homoserine lactone (C14-HSL), were detected in the cultivated AGS, but C14-HSL was the major one, which was detected to be ranging from 86.58 ng/gMLSS to 594.00 ng/gMLSS among all samples. Most importantly, the concentration of C14-HSL was positively correlated to the production of LB-EPS and TB-EPS (r > 0.906, P < 0.034, minimum ‘r’ and maximum ‘p’), which demonstrated it’s a crucial component in the formation of AGS and determined its stability. The results indicated that the structure of microbial community showed weak correlation with the content of AHLs and EPS if without the pressure of microbial selection. But, the conditions within the bioreactor determined the microbial community, and the contained functional bacteria released signaling molecules to promote the granulation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
