Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2016-12-01

Journal: WATER RESEARCH

Included Journals: Scopus、PubMed、EI、SCIE

Volume: 106

Page Number: 339-343

ISSN: 0043-1354

Key Words: CO2 reduction; Hydrogen production; Formate production; Clean energy; MES

Abstract: Electrochemical reduction of carbon dioxide (CO2) to useful chemicals is an attractive strategy to cut its emission in atmosphere. However, high overpotential and energy consumption required in the electrochemical reduction are the major barriers of this process. In this study, a new CO2 reduction technique for production of formic acid was proposed from waste activated sludge digestion in a microbial electrosynthesis system (MES) with iron plate and carbon pillar as the electrodes. Compared with other reactors, methane production of the Fe-C MES reactor was slightly lower and CO2 was undetectable. Instead, considerable formate (672.3 mg/L) and H-2 (45.8 mL) were produced in this Fe-C MES reactor, but not found in the other reactors. It should be ascribed to the reduction of CO2 and H+ at cathode. The reduction of H+ resulted in a weak alkaline pH (9.3), which made the methanogenesis slightly lower in Fe-C MES. (C) 2016 Elsevier Ltd. All rights reserved.