Characterization of an indigenous quorum quenching bacterium and its effect on the SMP, EPS, and microbial community of sludge mixture during wastewater treatment. (August 2020)

• Record Type: Journal Article
• Authors: Dong, Xinjiao; Zhu, Rui; Li, Yaru; Qin, Jing; Ge, Shimei
• Is Part Of: International biodeterioration & biodegradation. Volume 152(2020)
• Publication Date: 2020-08
• Subjects: Quorum quenching bacteria -- C8-HSL signaling Molecules -- Soluble microbial products (SMP) -- Extracellular polymeric substances (EPS) -- Microbial community -- The gompertz model; Biodegradation -- Periodicals; Bioremediation -- Periodicals; Biodegradation -- Periodicals; Biodégradation -- Périodiques; Biorestauration -- Périodiques; Electronic journals; 620.11223
• DOI: 10.1016/j.ibiod.2020.104995
• Languages: English
• ISSNs: 0964-8305

Abstract

Abstract: Quorum quenching (QQ) is a new and promising strategy that disrupts the quorum sensing system, a universal and important microbial communication that results in membrane biofouling and other various communal behaviors. A bacterial strain Z4 with a relatively high QQ ability was isolated from a wastewater treatment plant and identified as a Serratia sp. This is the first report of a bacterium belonging to the genus Serratia with such QQ ability. This strain not only degraded at least 93% of 10 μg/ml C8-HSL signaling molecules within 24 h, but also reduced the main bacterial by-products in sludge mixture, soluble microbial products (SMP) mass by 75%, and extracellular polymeric substances (EPS) by 37%, during wastewater treatment. Interestingly, the presence of strain Z4 in the sludge had an obvious impact on the microbial diversity of the sludge mixture during wastewater treatment. The results show that the isolated strain Z4 is a very potent strain for use in a QQ strategy, and the application and mechanism in biofouling mitigation should be further explored. Highlights: This is the first report of a Serratia sp. with a relatively high quorum quenching ability. The modified Gompertz model fit the degradation of C8-HSL signaling molecules. The isolate decreased the SMP in the sludge by 75%, and can mitigate biofouling. The isolate had an impact on the microbial diversity of the sludge mixture.