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Bioresource Technology
Vol. 302, 2020


Photocathode optimization and microbial community in the solar-illuminated bio-photoelectrochemical system for nitrofurazone degradation

Yanping Houa,b, Guiyun Yuana, Shanming Qina, Lingli Tua, Yimin Yana, Zebin Yua, Hongfei Linc, Yongli Chenc, Hongxiangv Zhua,d, Hainong Songc, Shuangfei Wangb,c,d

School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China

Abstract

To further enhance the bio-photoelectrochemical system (BPES) performance for nitrofurazone (NFZ) degradation and current output, the g-C3N4/CdS photocathode was optimized, and microbial community shift from inoculation to the BPES was analyzed. Results showed that photocathode with g-C3N4/CdS (mass ratio of 1:9) loading of 7.5 mg/cm2 exhibited the best performance, with NFZ removal of 83.14% (within 4 h) and current of ~9 mA in the BPES. Proteobacteria accounted for the largest proportion: 66.53% (inoculation), 71.89% (microbial electrolysis cell (MEC) anode), 74.67% (BPES anode) and 57.31% (BPES cathode), respectively. In addition, Geobacter was the most dominant genus in MEC and BPES anode and cathode, which occupied 31.64%, 67.73% and 41.34%, respectively. The microbial compositions of BPES anode and cathode were similar, but different from that of MEC anode. Notably, Rhodopseudomonas, a photosynthetic species, was detected in the BPES. Cognition of microbial community in the BPES is important for advancing its development.

Graphical abstract

Keywords: Bio-photoelectrochemical system (BPES), g-C3N4/CdS photocathode optimization, Microbial community, Nitrofurazone degradation

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