Mechanistic insights into the effect of poly ferric sulfate on anaerobic digestion of waste activated sludge.

Liu, X; Wu, Y; Xu, Q; Du, M; Wang, D; Yang, Q; Yang, G; Chen, H; Zeng, T; Liu, Y; Wang, Q; Ni, B-J

Mechanistic insights into the effect of poly ferric sulfate on anaerobic digestion of waste activated sludge.

Liu, X Wu, Y Xu, Q Du, M Wang, D Yang, Q Yang, G Chen, H Zeng, T Liu, Y

Wang, Q

Ni, B-J

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Water Research, 2021, 189, pp. 1-12
Issue Date:: 2021-02-01

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Field	Value	Language
dc.contributor.author	Liu, X
dc.contributor.author	Wu, Y
dc.contributor.author	Xu, Q
dc.contributor.author	Du, M
dc.contributor.author	Wang, D
dc.contributor.author	Yang, Q
dc.contributor.author	Yang, G
dc.contributor.author	Chen, H
dc.contributor.author	Zeng, T
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.contributor.author	Ni, B-J
dc.date.accessioned	2022-04-13T03:26:59Z
dc.date.available	2020-11-13
dc.date.available	2022-04-13T03:26:59Z
dc.date.issued	2021-02-01
dc.identifier.citation	Water Research, 2021, 189, pp. 1-12
dc.identifier.issn	0043-1354
dc.identifier.issn	1879-2448
dc.identifier.uri	http://hdl.handle.net/10453/156187
dc.description.abstract	Poly ferric sulfate (PFS), one of the typical inorganic flocculants widely used in wastewater management and waste activated sludge (WAS) dewatering, could be accumulated in WAS and inevitably entered in anaerobic digestion system at high levels. However, knowledge about its impact on methane production is virtually absent. This study therefore aims to fill this gap and provide insights into the mechanisms involved through both batch and long-term tests using either real WAS or synthetic wastewaters as the digestion substrates. Experimental results showed that the maximum methane potential and production rate of WAS was respectively retarded by 39.0% and 66.4%, whereas the lag phase was extended by 237.0% at PFS of 40 g per kg of total solids. Mechanism explorations exhibited that PFS induced the physical enmeshment and disrupted the enzyme activity involved in anaerobic digestion, resulting in an inhibitory state of the bioprocess of hydrolysis, acidogenesis, and methanogenesis. Furthermore, PFS's inhibition to hydrogenotrophic methanogenesis was much severer than that to acetotrophic methanogenesis, which could be supported by the elevated abundances of Methanosaeta sp and the dropped abundances of Methanobacterium sp in PFS-present digester, and probably due to the severe mass transfer resistance of hydrogen between the syntrophic bacteria and methanogens, as well as the higher hydrogen appetency of PFS-induced sulfate reducing bacteria. Among the derivatives of PFS, "multinucleate and multichain-hydroxyl polymers" and sulfate were unveiled to be the major contributors to the decreased methane potential, while the "multinucleate and multichain-hydroxyl polymers" were identified to be the chief buster to the slowed methane-producing rate and the extended lag time.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Water Research
dc.relation.isbasedon	10.1016/j.watres.2020.116645
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Environmental Engineering
dc.subject.mesh	Anaerobiosis
dc.subject.mesh	Bioreactors
dc.subject.mesh	Ferric Compounds
dc.subject.mesh	Methane
dc.subject.mesh	Sewage
dc.subject.mesh	Anaerobiosis
dc.subject.mesh	Bioreactors
dc.subject.mesh	Ferric Compounds
dc.subject.mesh	Methane
dc.subject.mesh	Sewage
dc.subject.mesh	Ferric Compounds
dc.subject.mesh	Methane
dc.subject.mesh	Bioreactors
dc.subject.mesh	Sewage
dc.subject.mesh	Anaerobiosis
dc.title	Mechanistic insights into the effect of poly ferric sulfate on anaerobic digestion of waste activated sludge.
dc.type	Journal Article
utslib.citation.volume	189
utslib.location.activity	England
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	open_access	*
pubs.consider-herdc	false
utslib.copyright.embargo	2023-02-01T00:00:00+1000Z
dc.date.updated	2022-04-13T03:26:57Z
pubs.publication-status	Published
pubs.volume	189

Abstract:

Poly ferric sulfate (PFS), one of the typical inorganic flocculants widely used in wastewater management and waste activated sludge (WAS) dewatering, could be accumulated in WAS and inevitably entered in anaerobic digestion system at high levels. However, knowledge about its impact on methane production is virtually absent. This study therefore aims to fill this gap and provide insights into the mechanisms involved through both batch and long-term tests using either real WAS or synthetic wastewaters as the digestion substrates. Experimental results showed that the maximum methane potential and production rate of WAS was respectively retarded by 39.0% and 66.4%, whereas the lag phase was extended by 237.0% at PFS of 40 g per kg of total solids. Mechanism explorations exhibited that PFS induced the physical enmeshment and disrupted the enzyme activity involved in anaerobic digestion, resulting in an inhibitory state of the bioprocess of hydrolysis, acidogenesis, and methanogenesis. Furthermore, PFS's inhibition to hydrogenotrophic methanogenesis was much severer than that to acetotrophic methanogenesis, which could be supported by the elevated abundances of Methanosaeta sp and the dropped abundances of Methanobacterium sp in PFS-present digester, and probably due to the severe mass transfer resistance of hydrogen between the syntrophic bacteria and methanogens, as well as the higher hydrogen appetency of PFS-induced sulfate reducing bacteria. Among the derivatives of PFS, "multinucleate and multichain-hydroxyl polymers" and sulfate were unveiled to be the major contributors to the decreased methane potential, while the "multinucleate and multichain-hydroxyl polymers" were identified to be the chief buster to the slowed methane-producing rate and the extended lag time.

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http://hdl.handle.net/10453/156187