Medium-chain fatty acid production from Chinese liquor brewing yellow water by electro-fermentation: Division of fermentation process and segmented electrical stimulation

Hongzhi Ma; Wenyu Wu; Ziqiang Yu; Jihua Zhao; Penglu Fu; Changlei Xia; Su Shiung Lam; Qunhui Wang; Ming Gao

doi:10.1016/j.biortech.2022.127510

Medium-chain fatty acid production from Chinese liquor brewing yellow water by electro-fermentation: Division of fermentation process and segmented electrical stimulation

Bioresour Technol. 2022 Sep:360:127510. doi: 10.1016/j.biortech.2022.127510. Epub 2022 Jun 22.

Authors

Hongzhi Ma¹, Wenyu Wu², Ziqiang Yu², Jihua Zhao², Penglu Fu², Changlei Xia³, Su Shiung Lam⁴, Qunhui Wang², Ming Gao²

Affiliations

¹ Department of Environmental Science and Engineering, University of Science and Technology Beijing 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China. Electronic address: mahongzhi@ustb.edu.cn.
² Department of Environmental Science and Engineering, University of Science and Technology Beijing 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China.
³ Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
⁴ Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), University Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia.

PMID: 35752258
DOI: 10.1016/j.biortech.2022.127510

Abstract

Electro-fermentation (EF) has been proposed as a method to improve the yield of medium-chain fatty acid (MCFA). In this study, MCFA production from Chinese liquor wastewater (yellow water) was investigated and corresponding composite electron donors (lactate and ethanol in yellow water) were investigated by different electrical stimulation modes. The caproate yield under whole period electrical stimulation increased by 250.9% compared with open circuit. The oxidation-dominated and reduction-dominated periods of the fermentation process were divided, and the segmented electrical stimulation experiment showed the caproate yield under reduction-dominated EF system further increased by 288.5% compared with open circuit. The microbial diversity analysis demonstrated that Clostridium 12 might be enriched better by keeping open circuit during EDs consumption, meanwhile the bacteria with potential negative effects on CE were inhibited. The electrical stimulation mode of EF process was optimized and provided a new way to recycle organic wastewater.

Keywords: Caproate; Chain elongation; Electro-fermentation; Medium chain fatty acid; Segmented electrical stimulation.

MeSH terms

Caproates*
China
Electric Stimulation
Fatty Acids
Fermentation
Wastewater*
Water

Substances

Caproates
Fatty Acids
Waste Water
Water