Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-06-01

Journal: ENVIRONMENTAL SCIENCE & TECHNOLOGY

Included Journals: ISTIC、PKU、PubMed、EI、SCIE、Scopus

Volume: 45

Issue: 11

Page Number: 5025-5031

ISSN: 0013-936X

Abstract: Setting a biocathode potential at -300 mV improved the subsequent performance of an MFC for Cr(VI) reduction compared to a control (no set potential). With this set potential, the startup time was reduced to 19 days, the reduction of Cr(VI) was improved to 19.7 mg/L d, and the maximum power density was increased to 6.4 W/m(3) compared to the control (26 days, 14.0 mg/L d and 4.1 W/m(3)). Set potentials of -150 my and -300 mV also improved system performance and led to similarly higher utilization of metabolic energy gained (PMEG) than set potentials of +200 mV and -450 mV. We observed putative pili at -150 and -300 mV potentials, and aggregated precipitates on bacterial surfaces in both poised and nonpoised controls. These tests show that there are optimal potentials that can be set for developing a Cr(VI) biocathode,