Multiple roles of humic substances in anaerobic digestion systems: A review

Long, S; Yang, J; Hao, Z; Shi, Z; Liu, X; Xu, Q; Wang, Y; Wang, D; Ni, BJ

Multiple roles of humic substances in anaerobic digestion systems: A review

Long, S Yang, J Hao, Z Shi, Z Liu, X Xu, Q Wang, Y Wang, D Ni, BJ

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Journal of Cleaner Production, 2023, 418
Issue Date:: 2023-09-15

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Field	Value	Language
dc.contributor.author	Long, S
dc.contributor.author	Yang, J
dc.contributor.author	Hao, Z
dc.contributor.author	Shi, Z
dc.contributor.author	Liu, X
dc.contributor.author	Xu, Q
dc.contributor.author	Wang, Y
dc.contributor.author	Wang, D
dc.contributor.author	Ni, BJ
dc.date.accessioned	2024-04-12T05:06:42Z
dc.date.available	2024-04-12T05:06:42Z
dc.date.issued	2023-09-15
dc.identifier.citation	Journal of Cleaner Production, 2023, 418
dc.identifier.issn	0959-6526
dc.identifier.issn	1879-1786
dc.identifier.uri	http://hdl.handle.net/10453/177835
dc.description.abstract	Humic substances (HS) is one of the main organic components of biowaste with high molecular weight and aromaticity. There is a growing concern that HS will hinder the recovery of biomass energy during anaerobic digestion in consideration of its recalcitrance and inhibitory effects. However, some studies have come to the exact opposite conclusion. This study for the first time comprehensively summarized the transformation mechanism, effect mechanism and inhibition mitigation strategies of HS in anaerobic digestion systems, as well as corresponding knowledge gaps, research defects and future perspectives. The content and aromaticity of HS are dynamic during anaerobic digestion followed a three-step process of release, decomposition and repolymerization, which is influenced by operation time and temperature, organic loading rate, precursor concentration and the type of substrates. In consistent with conflicting understandings of the role of HS in biomass energy recovery, HS is possible to positively or negatively affect the hydrolysis, acidification and methanogenesis processes of anaerobic digestion by acting as surfactant, adhesion agent, terminal electron acceptor, electron shuttle, organics binder or pH buffer. However, the boundary and threshold of different roles of HS are unable to be defined so far, due to the knowledge gap about the correlation between dynamic evolution of natural HS characteristics and its influencing behaviors. It is also found that HS could indirectly affect anaerobic digestion by regulating the bioavailability, biotransformation and bioactivity of exogenous pollutants (heavy metals, organohalides, microplastics, antibiotics, etc), but related knowledge is severely lacking. The existing HS inhibition mitigation strategies can be classified to passivator addition, co-digestion, pretreatment and integrate process, among which microbial electrolysis cell assisted anaerobic digestion is recommended as the most promising.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Journal of Cleaner Production
dc.relation.isbasedon	10.1016/j.jclepro.2023.138066
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0907 Environmental Engineering, 0910 Manufacturing Engineering, 0915 Interdisciplinary Engineering
dc.subject.classification	Environmental Sciences
dc.subject.classification	33 Built environment and design
dc.subject.classification	40 Engineering
dc.title	Multiple roles of humic substances in anaerobic digestion systems: A review
dc.type	Journal Article
utslib.citation.volume	418
utslib.for	0907 Environmental Engineering
utslib.for	0910 Manufacturing Engineering
utslib.for	0915 Interdisciplinary 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	2024-04-12T05:06:39Z
pubs.publication-status	Published
pubs.volume	418

Abstract:

Humic substances (HS) is one of the main organic components of biowaste with high molecular weight and aromaticity. There is a growing concern that HS will hinder the recovery of biomass energy during anaerobic digestion in consideration of its recalcitrance and inhibitory effects. However, some studies have come to the exact opposite conclusion. This study for the first time comprehensively summarized the transformation mechanism, effect mechanism and inhibition mitigation strategies of HS in anaerobic digestion systems, as well as corresponding knowledge gaps, research defects and future perspectives. The content and aromaticity of HS are dynamic during anaerobic digestion followed a three-step process of release, decomposition and repolymerization, which is influenced by operation time and temperature, organic loading rate, precursor concentration and the type of substrates. In consistent with conflicting understandings of the role of HS in biomass energy recovery, HS is possible to positively or negatively affect the hydrolysis, acidification and methanogenesis processes of anaerobic digestion by acting as surfactant, adhesion agent, terminal electron acceptor, electron shuttle, organics binder or pH buffer. However, the boundary and threshold of different roles of HS are unable to be defined so far, due to the knowledge gap about the correlation between dynamic evolution of natural HS characteristics and its influencing behaviors. It is also found that HS could indirectly affect anaerobic digestion by regulating the bioavailability, biotransformation and bioactivity of exogenous pollutants (heavy metals, organohalides, microplastics, antibiotics, etc), but related knowledge is severely lacking. The existing HS inhibition mitigation strategies can be classified to passivator addition, co-digestion, pretreatment and integrate process, among which microbial electrolysis cell assisted anaerobic digestion is recommended as the most promising.

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http://hdl.handle.net/10453/177835