Co-electron donors driven medium-chain fatty acids production: Roles of electron donors, reaction kinetics and metabolic pathways

被引：6

作者：

Wu S.-L. ^{[1
]}

Long Y. ^{[1
]}

Wei W. ^{[2
]}

Shi X. ^{[2
]}

Shen D. ^{[1
]}

Ni B.-J. ^{[2
]}

机构：

[1] Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Engineering Research Center of Non-ferrous Metal Waste Recycling, Zhejiang Gongshang University

[2] Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, 2007, NSW

来源：

Chemosphere | 2023年 / 338卷

基金：

澳大利亚研究理事会;

关键词：

Alkaline fermentation liquor; Co-electron donors; Kinetic analysis; Medium-chain fatty acid; Metabolic pathway; Waste activated sludge;

D O I：

10.1016/j.chemosphere.2023.139515

中图分类号：

学科分类号：

摘要：

Energy conversion of waste activated sludge alkaline fermentation liquor (WASAFL) to medium-chain fatty acids (MCFAs) is promising for sludge treatment and carbon recovery. However, the single electron donor (ED) fermentation for MCFAs production has irreparable defects. To resolve the respective shortcomings of single electron donor (ED) and improve the MCFAs production efficiency from WASAFL, a novel biotechnical process utilizing ethanol and lactate as co-EDs within different combination ratios were investigated. The results verified that MCFAs production was highest with ethanol to lactate ratio of 1:3 (6988.54 ± 208.18 mg COD/L), being 1.46 and 1.87 times of that with ethanol and lactate as single ED. The kinetic analysis results confirmed that ethanol to lactate ratio of 1:3 resulted in the highest MCFAs yield and formation rate. The microbial taxa results uncovered that the relative abundance of Sphaerochaeta and Haloimpatiens showed positive correlation with MCFAs production. The metabolic pathway analysis indicated that the ethanol oxidization, lactate oxidization, acrylate pathway, reverse β oxidization and fatty acid biosynthesis pathway might take place in the WASAFL fermentation system, contributing to the WASAFL-to-MCFAs conversion. © 2023 Elsevier Ltd

引用

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