Enhancement of nitrobenzene bioreduction by the combination of Shewanella species and mediator-functionalized biocarriers

摘要：

　　The biotransformation of nitroaromatics under anaerobic conditions can be improved by the addition of quinonoid mediators.However,continuous dosing and discharge of some biologically recalcitrant quinoids will result in the secondary contamination.In present study,the performance of the combination of Shewanella species and anthraquinone-2-sulfonate-modified polyurethane foam (Shewanella/AQS-PUF) in the anaerobic treatment of nitrobenzene was investigated.The results showed that Shewanella/AQS-PUF accelerated significantly nitrobenzene bioreduction with nitrobenzene removal rote up to 0.13 mM.h-1.It is also found that AQS-PUF can induce Shewanella species to secrete more flavins (126.2μg L-1) as redox mediator for nitrobenzene bioreduction although extracellular flavins decreased with increasing nitrobenzene concentration,and that synergistic effect between Shewanella species and AQS-PUF was observed for promoting nitrobenzene biotransformation with 5-fold increase in first-order rate constant compared to that without AQS-PUF.These results demonstrated that Shewanella/AQS-PUF has potential applications in the bioremediation of recalcitrant pollutants in water.

关键词： Nitrobenzene Shewanella Functionalized polyurethane foam Synergistic effect Bioreduction

作者: Jing Wang Guangfei Liu Hong Lv Yah Zhou

作者单位: Key Laboratory of lndustrial Ecology and Environmental Engineering(Ministry of Education), School of Environmental Science and Technology,Dalian University of Technology, Dalian 116024, China

会议类型: 国际会议

会议名称: 2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)

会议地点: 大连

会议语种:英文

页码: 516-519

在线出版日期: 2013-06-04（万方平台首次上网日期，不代表论文的发表时间）