Natural diatomite mediated continuous anaerobic sludge digestion: Performance, modelling and mechanisms

Wei, W; Chen, Z; Hao, D; Liu, X; Ni, BJ

Natural diatomite mediated continuous anaerobic sludge digestion: Performance, modelling and mechanisms

Wei, W

Chen, Z

Hao, D Liu, X Ni, BJ

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Cleaner Production, 2021, 329, pp. 1-8
Issue Date:: 2021-12-20

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Field	Value	Language
dc.contributor.author	Wei, W https://orcid.org/0000-0001-5613-337X
dc.contributor.author	Chen, Z https://orcid.org/0000-0003-0627-0856
dc.contributor.author	Hao, D
dc.contributor.author	Liu, X
dc.contributor.author	Ni, BJ
dc.date.accessioned	2022-05-12T02:08:04Z
dc.date.available	2022-05-12T02:08:04Z
dc.date.issued	2021-12-20
dc.identifier.citation	Journal of Cleaner Production, 2021, 329, pp. 1-8
dc.identifier.issn	0959-6526
dc.identifier.issn	0959-6526
dc.identifier.uri	http://hdl.handle.net/10453/157260
dc.description.abstract	Anaerobic digestion is generally restricted by the low degradability of waste activated sludge (WAS) and slow hydrolysis rate. This work provided an innovative technique to promote continuous anaerobic digestion performance mediated by natural diatomite. In continuous tests over 125 days, 2 g/g-Total solids (TS) of natural diatomite addition increased daily methane production and volatile solids (VS) destruction by 23.3% and 23.5%, respectively, leading to a 5.6% decrease in digestate volume for disposal. Microbial community in the natural diatomite mediated digester changed toward a favorable direction for anaerobic sludge digestion. Process modelling indicated that the increased natural diatomite presence increased hydrolysis rate, biomethane potential and degradation extent of the rapidly biodegradable substrates in WAS, with the highest enhancement being approximately 78.9%, 44.5% and 45.0%, respectively, achieved at 2 g/g- TS diatomite. However, the slowly biodegradable substrates in WAS stayed relatively stable. The mechanism studies revealed that natural diatomite mitigated ammonia inhibition and enhanced electron transfer for WAS-to-methane conversion mediated by its strong adsorption capacity and conductivity. The versatility of the technology proposed is also verified by the diatomite mediated experiments using different natural diatomite from different sources. Compared to the most natural minerals, diatomite exhibited either a greater anaerobic digestion performance or a lower dosage, bringing strong benefits in economy, environment and technology.
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.2021.129750
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	Natural diatomite mediated continuous anaerobic sludge digestion: Performance, modelling and mechanisms
dc.type	Journal Article
utslib.citation.volume	329
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	2022-05-12T02:08:01Z
pubs.publication-status	Published
pubs.volume	329

Abstract:

Anaerobic digestion is generally restricted by the low degradability of waste activated sludge (WAS) and slow hydrolysis rate. This work provided an innovative technique to promote continuous anaerobic digestion performance mediated by natural diatomite. In continuous tests over 125 days, 2 g/g-Total solids (TS) of natural diatomite addition increased daily methane production and volatile solids (VS) destruction by 23.3% and 23.5%, respectively, leading to a 5.6% decrease in digestate volume for disposal. Microbial community in the natural diatomite mediated digester changed toward a favorable direction for anaerobic sludge digestion. Process modelling indicated that the increased natural diatomite presence increased hydrolysis rate, biomethane potential and degradation extent of the rapidly biodegradable substrates in WAS, with the highest enhancement being approximately 78.9%, 44.5% and 45.0%, respectively, achieved at 2 g/g- TS diatomite. However, the slowly biodegradable substrates in WAS stayed relatively stable. The mechanism studies revealed that natural diatomite mitigated ammonia inhibition and enhanced electron transfer for WAS-to-methane conversion mediated by its strong adsorption capacity and conductivity. The versatility of the technology proposed is also verified by the diatomite mediated experiments using different natural diatomite from different sources. Compared to the most natural minerals, diatomite exhibited either a greater anaerobic digestion performance or a lower dosage, bringing strong benefits in economy, environment and technology.

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http://hdl.handle.net/10453/157260