Medium-chain fatty acids production from sewage sludge through anaerobic fermentation: A critical review

Wang, Y; Zhang, Z; Wang, X; Guo, H; Zhu, T; Zhao, Y; Lu, X; Zhang, Y; Ni, BJ; Liu, Y

Medium-chain fatty acids production from sewage sludge through anaerobic fermentation: A critical review

Wang, Y Zhang, Z Wang, X Guo, H Zhu, T Zhao, Y Lu, X Zhang, Y Ni, BJ Liu, Y

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Publisher:: ELSEVIER SCIENCE SA
Publication Type:: Journal Article
Citation:: Chemical Engineering Journal, 2023, 477
Issue Date:: 2023-12-01

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Field	Value	Language
dc.contributor.author	Wang, Y
dc.contributor.author	Zhang, Z
dc.contributor.author	Wang, X
dc.contributor.author	Guo, H
dc.contributor.author	Zhu, T
dc.contributor.author	Zhao, Y
dc.contributor.author	Lu, X
dc.contributor.author	Zhang, Y
dc.contributor.author	Ni, BJ
dc.contributor.author	Liu, Y
dc.date.accessioned	2024-05-16T10:37:46Z
dc.date.available	2024-05-16T10:37:46Z
dc.date.issued	2023-12-01
dc.identifier.citation	Chemical Engineering Journal, 2023, 477
dc.identifier.issn	1385-8947
dc.identifier.issn	1873-3212
dc.identifier.uri	http://hdl.handle.net/10453/178990
dc.description.abstract	Huge sludge volumes and increased energy demands are the main challenges faced by wastewater treatment plants (WWTPs) currently, while it stimulates organics transformation and carbon recovery from sludge treatment process. Due to higher energy density and greater hydrophobicity, medium-chain fatty acids (MCFAs) exhibit easier extraction and more widespread application than traditional short-chain fatty acids (SCFAs). Therefore, MCFAs synthesis from sewage sludge via chain elongation (CE) has recently attracted growing attention in anaerobic open culture fermentation. Nevertheless, a comprehensive and systematic review focused on MCFAs synthesis from sludge is not available so far. This study provides a critical review on sewage sludge-derived MCFAs synthesis. The metabolic pathways, potential influencing factors, and cooperative and competitive relationships among various microorganisms are first elucidated to understand the mechanisms, limitations, and microbial interactions involved in MCFAs production via open culture fermentation of sludge. Unfortunately, MCFAs synthesis from sewage sludge is mainly hampered by low organics accessibility, inferior electron transfer efficiency and presence of competitive microbes. To foster sludge degradation and high-value MCFAs production, various techniques based on pretreatment and facilitation of electron transfer have recently been proposed, which are comprehensively reviewed with the corresponding mechanisms meticulously discussed. Ultimately, knowledge gaps and new opportunities for sludge-derived MCFAs production are prospected. This review will offer theoretical and technological guidelines for the subsequent investigations and future engineering applications of MCFAs production from sewage sludge.
dc.language	English
dc.publisher	ELSEVIER SCIENCE SA
dc.relation.ispartof	Chemical Engineering Journal
dc.relation.isbasedon	10.1016/j.cej.2023.147138
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 0907 Environmental Engineering
dc.subject.classification	Chemical Engineering
dc.subject.classification	4004 Chemical engineering
dc.subject.classification	4011 Environmental engineering
dc.subject.classification	4016 Materials engineering
dc.title	Medium-chain fatty acids production from sewage sludge through anaerobic fermentation: A critical review
dc.type	Journal Article
utslib.citation.volume	477
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	0907 Environmental Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2024-05-16T10:37:43Z
pubs.publication-status	Published
pubs.volume	477

Abstract:

Huge sludge volumes and increased energy demands are the main challenges faced by wastewater treatment plants (WWTPs) currently, while it stimulates organics transformation and carbon recovery from sludge treatment process. Due to higher energy density and greater hydrophobicity, medium-chain fatty acids (MCFAs) exhibit easier extraction and more widespread application than traditional short-chain fatty acids (SCFAs). Therefore, MCFAs synthesis from sewage sludge via chain elongation (CE) has recently attracted growing attention in anaerobic open culture fermentation. Nevertheless, a comprehensive and systematic review focused on MCFAs synthesis from sludge is not available so far. This study provides a critical review on sewage sludge-derived MCFAs synthesis. The metabolic pathways, potential influencing factors, and cooperative and competitive relationships among various microorganisms are first elucidated to understand the mechanisms, limitations, and microbial interactions involved in MCFAs production via open culture fermentation of sludge. Unfortunately, MCFAs synthesis from sewage sludge is mainly hampered by low organics accessibility, inferior electron transfer efficiency and presence of competitive microbes. To foster sludge degradation and high-value MCFAs production, various techniques based on pretreatment and facilitation of electron transfer have recently been proposed, which are comprehensively reviewed with the corresponding mechanisms meticulously discussed. Ultimately, knowledge gaps and new opportunities for sludge-derived MCFAs production are prospected. This review will offer theoretical and technological guidelines for the subsequent investigations and future engineering applications of MCFAs production from sewage sludge.

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http://hdl.handle.net/10453/178990