Revealing the mechanism of zinc oxide nanoparticles facilitating hydrogen production in alkaline anaerobic fermentation of waste activated sludge

Zhang, YT; Wei, W; Ni, BJ

Revealing the mechanism of zinc oxide nanoparticles facilitating hydrogen production in alkaline anaerobic fermentation of waste activated sludge

Zhang, YT Wei, W

Ni, BJ

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Cleaner Production, 2021, 328, pp. 1-10
Issue Date:: 2021-12-15

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Field	Value	Language
dc.contributor.author	Zhang, YT
dc.contributor.author	Wei, W https://orcid.org/0000-0001-5613-337X
dc.contributor.author	Ni, BJ
dc.date.accessioned	2022-05-12T02:47:50Z
dc.date.available	2022-05-12T02:47:50Z
dc.date.issued	2021-12-15
dc.identifier.citation	Journal of Cleaner Production, 2021, 328, pp. 1-10
dc.identifier.issn	0959-6526
dc.identifier.issn	0959-6526
dc.identifier.uri	http://hdl.handle.net/10453/157267
dc.description.abstract	Zinc oxide nanoparticles (ZnO NPs) has been documented to accumulate in waste activated sludge (WAS). Nevertheless, its potential effect on hydrogen accumulation during anaerobic fermentation has never been reported. Such impact exists in anaerobic sludge treatment systems but is unrecognized before. Therefore, this work aims to explore the effect of ZnO NPs on hydrogen accumulation during WAS fermentation while avoiding hydrogen consumption by maintaining pH around 10. Deep insights into the mechanisms of the enhanced hydrogen production after dosing ZnO NPs can then be provided. The 21.1 to 74.0 mL-H2/g-VS hydrogen yields were obtained after dosing 0–150 mg/g-TS ZnO NPs into the system, which is 2.5 times higher than the control. The zinc ions released from ZnO NPs did not pose obvious cytotoxic effect on organisms based on the mechanism exploration of this study. The reactive oxygen species (ROS) induced by ZnO NPs facilitated sludge disintegration and improved the biodegradability of released organics, but restrained the bio-processes of hydrolysis and acetogenesis simultaneously. This was further verified by the microbial community analysis, as the abundance of key microbes related to hydrolysis and acetogenesis was reduced evidently in the presence of 150 mg/g-TS ZnO NPs. This study would provide a green and economic strategy for the sustainable engineering application of WAS containing ZnO NPs.
dc.language	English
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/FT160100195
dc.relation.ispartof	Journal of Cleaner Production
dc.relation.isbasedon	10.1016/j.jclepro.2021.129580
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0907 Environmental Engineering, 0910 Manufacturing Engineering, 0915 Interdisciplinary Engineering
dc.subject.classification	Environmental Sciences
dc.title	Revealing the mechanism of zinc oxide nanoparticles facilitating hydrogen production in alkaline anaerobic fermentation of waste activated sludge
dc.type	Journal Article
utslib.citation.volume	328
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	*
pubs.consider-herdc	false
dc.date.updated	2022-05-12T02:47:46Z
pubs.publication-status	Published
pubs.volume	328

Abstract:

Zinc oxide nanoparticles (ZnO NPs) has been documented to accumulate in waste activated sludge (WAS). Nevertheless, its potential effect on hydrogen accumulation during anaerobic fermentation has never been reported. Such impact exists in anaerobic sludge treatment systems but is unrecognized before. Therefore, this work aims to explore the effect of ZnO NPs on hydrogen accumulation during WAS fermentation while avoiding hydrogen consumption by maintaining pH around 10. Deep insights into the mechanisms of the enhanced hydrogen production after dosing ZnO NPs can then be provided. The 21.1 to 74.0 mL-H2/g-VS hydrogen yields were obtained after dosing 0–150 mg/g-TS ZnO NPs into the system, which is 2.5 times higher than the control. The zinc ions released from ZnO NPs did not pose obvious cytotoxic effect on organisms based on the mechanism exploration of this study. The reactive oxygen species (ROS) induced by ZnO NPs facilitated sludge disintegration and improved the biodegradability of released organics, but restrained the bio-processes of hydrolysis and acetogenesis simultaneously. This was further verified by the microbial community analysis, as the abundance of key microbes related to hydrolysis and acetogenesis was reduced evidently in the presence of 150 mg/g-TS ZnO NPs. This study would provide a green and economic strategy for the sustainable engineering application of WAS containing ZnO NPs.

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http://hdl.handle.net/10453/157267