Efficient chain elongation synthesis of n-caproate from shunting fermentation of food waste

Qingyan Wang; Hao Fu; Guangming Zhang; Yan Wu; Weifang Ma; Chuan Fu; Yajing Cai; Lihui Zhong; Yiwei Zhao; Xinyi Wang; Panyue Zhang

doi:10.1016/j.biortech.2022.128569

Efficient chain elongation synthesis of n-caproate from shunting fermentation of food waste

Bioresour Technol. 2023 Feb:370:128569. doi: 10.1016/j.biortech.2022.128569. Epub 2022 Dec 31.

Authors

Qingyan Wang¹, Hao Fu¹, Guangming Zhang², Yan Wu³, Weifang Ma¹, Chuan Fu³, Yajing Cai¹, Lihui Zhong¹, Yiwei Zhao¹, Xinyi Wang¹, Panyue Zhang⁴

Affiliations

¹ Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
² School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300130, China.
³ School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404632, China.
⁴ Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China; School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404632, China. Electronic address: panyue_zhang@bjfu.edu.cn.

PMID: 36592865
DOI: 10.1016/j.biortech.2022.128569

Abstract

Food waste was used to produce ethanol by yeast fermentation and volatile fatty acids (VFAs) by hydrolytic acidogenesis for chain elongation. Effectiveness of mole ratio of ethanol in yeast fermentation effluent (YFE) to VFAs in hydrolytic acidification effluent (HAE) on chain elongation was examined. The ideal YFE to HAE ratio for chain elongation was 2:1, the highest n-caproate production was 169.76 mg COD/g vS and the food waste utilization was 65.43 %. Electron transfer and carbon distribution did not completely correspond to n-caproate production, suggesting timely product extraction. The abundance of Romboutsia and Clostridium_sensu_stricto_12 increased as chain elongation progressed, which was critical for the chain elongation to n-caproate. The food waste shunting ratio of yeast fermentation to hydrolytic acidogenesis was 6:5, and 572.6 CNY can be created through chain elongation from shunting fermentation of 1 t food waste. This study proposed a new approach for efficient producing n-caproate from food waste.

Keywords: Bioenergy; Chain elongation; Food waste; Shunting fermentation; n-Caproate.

MeSH terms

Bioreactors
Caproates
Ethanol
Fatty Acids, Volatile
Fermentation
Food*
Refuse Disposal*
Saccharomyces cerevisiae

Substances

hexanoic acid
Caproates
Fatty Acids, Volatile
Ethanol