Formate production from CO2 electroreduction in a salinity-gradient energy intensified microbial electrochemical system. (January 2021)

• Record Type: Journal Article
• Authors: Tian, Yan; Li, Da; Liu, Guohong; Li, Chao; Liu, Jia; Wu, Jing; Liu, Junfeng; Feng, Yujie
• Is Part Of: Bioresource technology. Volume 320: Part A(2021)
• Publication Date: 2021-01
• Subjects: Microbial reverse-electrodialysis CO2 reduction cell -- CO2 reduction -- Formate production -- Sustainable energy; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.124292
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: CO2 reduction was self-driven in microbial reverse electrodialysis cell. Formate production and wastewater treatment could be achieved simultaneously. The formate concentration could reach 143.5 ± 8.1 mg L −1 with COD removal over 80%. The stability of system depended on the provision of electron donors. Abstract: The electricity production of microbial electrochemical system can be substantially strengthened by coupling with a reverse electrodialysis stack which extracts energy from salinity gradient, therefore provides a possible way for value-added products in cathode without external energy input. Here, a microbial reverse-electrodialysis CO2 reduction cell (MRECC) was developed and successfully utilized to drive CO2 -to-formate conversion on a Bi/Cu cathode. Results confirmed the optimal anodic COD load and cathodic CO2 flow rate to be 1 g NaAc L −1 and 10 mL min −1 . MRECC could yielded 143.5 ± 8.1 mg L −1 of formate with total energy efficiency of 4.6 ± 0.9% and coulombic efficiency of 46.4 ± 2.4%. Increasing or decreasing anode or cathode load impaired MRECC performance from economic and environmental viabilities. MRECC provided a promising platform for simultaneous CO2 reduction and value-added chemicals production by using sustainable energy from wastewaters.