文献类型：期刊文献

英文题名：Birnessite modified graphite cathode toward efficient autotrophic denitrification of Thiobacillus denitrificans in bioelectrochemical system

作者：Huang, Guangtuan[1];Qu, Ling[1];Ding, Yi[1]

机构：[1]East China Univ Sci & Technol, Environm Protect Key Lab Environm Risk Assessment, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：150

起止页码：367

外文期刊名：DESALINATION AND WATER TREATMENT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000463027500034)】；

语种：英文

外文关键词：Autotrophic denitrification; Bioelectrochemical systems; Birnessite; Graphite cathode; Thiobacillus denitrificans

摘要：Biological autotrophic denitrification by Thiobacillus denitrificans was investigated in double-chamber bioelectrochemical systems (BESs) and birnessite prepared by sol-gel method was used to modify graphite cathodes and investigate its effect on nitrate removal. The results showed that T. denitrificans could utilize the birnessite-modified graphite cathodes as the direct electron donors for autotrophic denitrification and the nitrate reduction rate increased from 65.70 +/- 5.03 to 114.17 +/- 5.47 mmol NO3--N L-1 m(-2) d(-1). Ammonia nitrogen was not detected in the reduction products of nitrate, suggesting that dissimilatory nitrate reduction to ammonium (DNRA) did not occur in the experiment. Surface topography of the working electrode characterized by scanning electron microscopy (SEM) indicated that the electrode was colonized by biofilms of T. denitrificans which played an important role in facilitating electron transfer for nitrate reduction. Cyclic voltammetry (CV) tests suggested that the birnessite-modified graphite cathodes enhanced the electrochemical activity of T. denitrificans biofilms and effectively accelerated the nitrate reduction rate.