Enhanced denitrification at biocathode facilitated with biohydrogen production in a three-chambered bioelectrochemical system (BES) reactor
Enhanced denitrification at biocathode facilitated with biohydrogen production in a three-chambered bioelectrochemical system (BES) reactor
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DOI：
10.1016/j.cej.2016.11.152
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发表时间：
2017-03
影响因子：
15.1
通讯作者：
Chunyan Zhu;Hengliang Wang;Q. Yan;Rong He;Guangsheng Zhang
中科院分区：
文献类型：
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作者：
Chunyan Zhu;Hengliang Wang;Q. Yan;Rong He;Guangsheng Zhang
研究了BC、HBC和CHBC三组生物电化学体系在生物产氢催化生物阴极上的反硝化作用。三室CHBC反应器在6天内硝酸盐去除率达到95%，而HBC和BC分别需要8天和12天。在CHBC中，生物氢阴极的氢含量最高，达到52.49%。CHBC的功率密度和库仑效率（CE）分别达到118.43 mW m3和79.1±0.2%，优于其他两组。三种体系中，CHBC的电子转移电阻最低。通过Illumina MiSeq高通量测序，发现CHBC中富集了5个促进反硝化的核心属，包括simplicispira、Thauera、thermoonas、azoarcusand dottowia，而HBC和BC中分别富集了1个核心属，说明三室BES结构可以影响微生物多样性和群落组成，进而促进硝酸盐还原。此外，CHBC生物阴极上以还原硝酸盐为特征的氢消费者最为丰富，三室BES反应器可以增强生物阴极上的氢营养化反硝化作用。
Three groups of bioelectrochemical system (BES), including BC, HBC and CHBC, were investigated for denitrification at biohydrogen production facilitated biocathode. It was found nitrate removal efficiency reached 95% during 6 days for the three-chambered CHBC reactor, while 8 and 12 days were required for HBC and BC, respectively. Besides, highest hydrogen content of 52.49% could be obtained at the biohydrogen cathode in CHBC. In addition, power density and coulombic efficiency (CE) of CHBC reached 118.43 mW m3and 79.1 ± 0.2%, respectively, which were better than the other two groups. Resistance indicating electron transfer of CHBC also showed to be the lowest among the three systems. Through Illumina MiSeq high-throughput sequencing, it was found that 5 core genus promoting denitrification got enriched in CHBC, includingSimplicispira,Thauera,Thermomonas,AzoarcusandOttowia, while only 1 core genus was enriched in HBC and BC, respectively, which suggested that the three-chambered BES structure could affect the microbial diversity as well as the community compositions, and then promoted the nitrate reduction. Moreover, as hydrogen consumers featured for nitrate reduction were found to be the most abundant at CHBC biocathode, hydrogenotrophic denitrification at biocathode could be enhanced in the three-chambered BES reactor.