Effects of exogenous acylated homoserine lactones on biofilms in biofilters for gaseous toluene treatment  

作　　者：Zhuqiu Sun Bairen Yang Marvin Yeung Jinying Xi 

机构地区：[1]Environmental Simulation and Pollution Control State Key Joint Laboratory,School of Environment,Tsinghua University,Beijing 100084,China [2]School of Environmental Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China

出　　处：《Frontiers of Environmental Science & Engineering》2023年第2期29-38,共10页环境科学与工程前沿（英文）

基　　金：supported by the National Natural Science Foundation of China(No.52070113);the Natural Science Foundation of Jiangsu Province(No.BK20191480);the Open Fund of Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province(No.JBGS005).

摘　　要：Biofilters are typical biofilm reactors, and they usually have poor biofilm formation resulting in limited reactor performance. Exogenous acylated homoserine lactones (AHLs) can enhance biofilm formation in many bioreactors based on quorum sensing regulation. However, their effect on biofilm in biofilters utilized for volatile organic compound (VOC) removal is unknown and needs to be investigated. In this study, the effects of the exogenous AHLs on biofilters for gaseous toluene removal were investigated. Analysis of biofilms in biofilters showed that the addition of exogenous AHLs considerably enhanced biofilm growth;the average biofilm concentration increased by 18%. Furthermore, the average biofilm coverage proportions in biofilters with and without exogenous AHLs were 17 % and 13 %, respectively, demonstrating the positive effect of exogenous AHLs on biofilm coverage. In particular, exogenous AHLs promoted the production of extracellular polymeric substances and the microbial adhesive strength of the biofilm. In addition, the exogenous AHLs showed no significant effect on the gaseous toluene removal efficiency of the biofilter. These results show that exogenous AHLs can enhance biofilm formation and can guide the application of exogenous AHLs in VOC biofilters.

关 键 词：Quorum sensing AHLs BIOFILTER Biofilm formation 

分 类 号：X5[环境科学与工程—环境工程]