Mixed-culture biocathodes for acetate production from CO2 reduction in the microbial electrosynthesis: Impact of temperature

Hou-Yun Yang; Nan-Nan Hou; Yi-Xuan Wang; Jing Liu; Chuan-Shu He; Yi-Ran Wang; Wei-Hua Li; Yang Mu

doi:10.1016/j.scitotenv.2021.148128

Mixed-culture biocathodes for acetate production from CO₂ reduction in the microbial electrosynthesis: Impact of temperature

Sci Total Environ. 2021 Oct 10:790:148128. doi: 10.1016/j.scitotenv.2021.148128. Epub 2021 May 30.

Authors

Hou-Yun Yang¹, Nan-Nan Hou², Yi-Xuan Wang³, Jing Liu⁴, Chuan-Shu He⁴, Yi-Ran Wang⁴, Wei-Hua Li⁵, Yang Mu⁴

Affiliations

¹ CAS Key Laboratory for Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science & Technology of China, Hefei, China; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China.
² CAS Key Laboratory for Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science & Technology of China, Hefei, China; School of Physics and Materials Engineering, Hefei Normal University, Hefei, China.
³ CAS Key Laboratory for Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science & Technology of China, Hefei, China. Electronic address: yxwangg@mail.ustc.edu.cn.
⁴ CAS Key Laboratory for Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science & Technology of China, Hefei, China.
⁵ Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China.

PMID: 34098277
DOI: 10.1016/j.scitotenv.2021.148128

Abstract

The temperature effect on bioelectrochemical reduction of CO₂ to acetate with a mixed-culture biocathode in the microbial electrosynthesis was explored. The results showed that maximum acetate amount of 525.84 ± 1.55 mg L^-1 and fastest acetate formation of 49.21 ± 0.49 mg L^-1 d^-1 were obtained under mesophilic conditions. Electron recovery efficiency for CO₂ reduction to acetate ranged from 14.50 ± 2.20% to 64.86 ± 2.20%, due to propionate, butyrate and H₂ generation. Mesophilic conditions were demonstrated to be more favorable for biofilm formation on the cathode, resulting in a stable and dense biofilm. At phylum level, the relative abundance of Bacteroidetes phylum in the biofilm remarkably increased under mesophilic conditions, compared with that at psychrophilic and thermophilic conditions. At genus level, the Clostridium, Treponema, Acidithiobacillus, Acetobacterium and Acetoanaerobium were found to be dominated genera in the biofilm under mesophilic conditions, while genera diversity decreased under psychrophilic and thermophilic conditions.

Keywords: Acetate; Carbon dioxide; Microbial electrosynthesis; Temperature.

MeSH terms

Acetates*
Carbon Dioxide*
Clostridium
Electrodes
Temperature

Substances

Acetates
Carbon Dioxide