AUTHOR=Yu Hang , Cao Yuhui , Zhao Qingliang , Liang Zhuyuan , Zhu Yimin 

TITLE=Cooperative cathodes for enhanced hexavalent chromium reduction and electricity generation in bioelectrochemical reactor with simultaneous sludge degradation

JOURNAL=Frontiers in Environmental Science

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2022.932266

DOI=10.3389/fenvs.2022.932266

ISSN=2296-665X

ABSTRACT=<p>A novel bioelectrochemical reactor assembled with cooperative cathodes of chemical cathode and bio-cathode (BER<sub>CC</sub>) and excess sludge as the anodic substrate obtained continuous and effective Cr(VI) reduction. Cooperative cathodes in BER<sub>CC</sub> stimulated the growth of electrochemically active microorganisms such as <italic>Geobacter</italic> sp. and <italic>Shewanella</italic> sp. in the anodic biofilm and produced 8.21 ± 0.64 mg C/(L·h) more electrons than the dual chemical cathodes in the bioelectrochemical reactor with dual chemical cathodes, which enhanced the electrons for electricity generation and Cr(VI) reduction by approximately 58.3% and 56.1 ± 5.6%, respectively.</p>