title: Biohydrogen facilitated denitrification at biocathode in bioelectrochemical system (BES).
abstract: Reductive removal of nitrate in bioelectrochemical system (BES) at abiotic cathode, biocathode and biohydrogen facilitated biocathode were investigated. It was found that nitrate removal efficiency reached 95% and 59% at the biohydrogen facilitated biocathode and biocathode respectively, while which was only 13% at the abiotic cathode. Meanwhile, activity of nitrate reductase reached 0.701 g-N/Lh for the biohydrogen facilitated group, which was about 9.3 times of the biocathode group. Moreover, electrochemical performances as power density, ohmic resistance, and polarization resistance of the biohydrogen facilitated group reached 76.96 mW/m(3), 8.63 ohm and 383 ohm, respectively, which were better than two other groups. Finally, an obvious shift of bacterial community responsible for the enhanced nitrate reduction between the two biocathode groups was observed. Therefore, nitrate reduction in BES could be enhanced at the biocathode than that of the abiotic cathode, and then be further boosted with the combination of biohydrogen.
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Liu
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China. Electronic address: yanqun@jiangnan.edu.cn.
authors.forename: Qun
authors.initials: Q
authors.lastname: Yan
authors.affiliation: School of Biotechnology, Jiangnan University, Wuxi 214122, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Shen
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D019149:Bioreactors; D058440:Denitrification / Q000502:physiology*; D058266:Dielectric Spectroscopy; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes / Q000382:microbiology*; D006859:Hydrogen / Q000378:metabolism*; D050901:Nitrate Reductase / Q000378:metabolism
chemical_list: D006859:Hydrogen; D050901:Nitrate Reductase
keywords: Bacterial community; Bioelectrochemical system; Biohydrogen; Denitrification; Electrochemical performance