聚噻吩改性阴极强化电极生物膜反应器去除硝酸盐机制研究  

Cathode modified by polythiophene to enhance the nitrate removal in biofilm electrode reactor(BER)

作　　者：翟思媛 赵迎新[1,2] 季民 ZHAI Siyuan;ZHAO Yingxin;JI Min(Water Pollution Control and Resource Utilization Research Laboratory,School of Environmental Science and Engineering,Tianjin University,Tianjin 300350;Tianjin Engineering Research Center of Urban River Eco Purification Technology,Tianjin 300350)

机构地区：[1]天津大学环境科学与工程学院,水污染控制与资源化利用重点实验室,天津300350 [2]天津市城市河道水质生态净化技术工程中心,天津300350

出　　处：《环境科学学报》2019年第10期3238-3246,共9页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划(No.2016YFC0401107);国家水体污染控制与治理科技重大专项(No.2015ZX07203-011)

摘　　要：为进一步提高电极生物膜反应器的脱氮效能,采用导电聚合物聚噻吩(PTh)和电子穿梭体蒽醌-2,6-二磺酸二钠(AQDS)改性阴极材料石墨毡,系统研究了不同碳氮比(C/N)条件下,改性电极的应用对BER体系的脱氮效能、电极表面生物相和体系微生物群落结构等方面的影响.结果表明,应用PTh与AQDS协同处理石墨毡的BER体系的NO-3-N去除速率和效能均明显优于未处理电极体系,在HRT=4 h、C/N为2.0时NO-3-N的去除率达到90.0%以上.PTh/AQDS改性石墨毡电极的生物膜与电极的比重为0.26±0.04,其值为对照组的2.4倍,证明了PTh/AQDS改性后电极具有更优的生物相容性.应用PTh/AQDS改性电极的BER具有更好的微生物丰富度和多样性,AQDS促进了特定微生物Thaueramechernichensis(24.6%)的富集和亚硝酸盐还原酶的活性,保障了BER体系的反硝化效能.In order to improve the denitrification efficiency of the BER,conductive polymer polythiophene(PTh)and electronic shuttle anthraquinone-2,6-disulfonate disodium(AQDS)were used to modify graphite felt.The effects of modified electrode on denitrification performance,biological phase of electrode surface and microbial community structure of BER systems were systematically investigated under different C/N conditions.The experimental results showed that the denitrification perfoemance in BER system with PTh/AQDS modified graphite felt was much better than the control BER and the nitrate removal efficiency was higher than 90.0%as C/N was 2.0.The ratio of biofilm to electrode of PTh/AQDS modified graphite felt electrode was 0.26±0.04,2.4 times higher than that of the control group,which proved that PTh/AQDS modified electrode had better biocompatibility.The proportions of biofilm and electrode of PTh/AQDS modified graphite felt cathode was 0.26±0.04,which was 2.4 times higher than unmodified electrode′s.This demonstrated that PTh/AQDS modified graphite felt has better biocompatibility.The BER with PTh/AQDS modified electrode showed better microbial richness and diversity.Furthermore,AQDS addition was in favor of Thauera_mechernichensis(24.6%)enrichment and nitrite reductase activity,which contribute to the higher denitrification efficiency of BER system.

关 键 词：聚噻吩 电极改性 电极生物膜反应器 脱氮 反应机制 

分 类 号：X171[环境科学与工程—环境科学]