Water treatment sludge conversion to biochar as cementitious material in cement composite.

De Carvalho Gomes, S; Zhou, JL; Zeng, X; Long, G

Water treatment sludge conversion to biochar as cementitious material in cement composite.

De Carvalho Gomes, S Zhou, JL Zeng, X Long, G

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Environmental Management, 2022, 306, pp. 1-9
Issue Date:: 2022-03-15

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Field	Value	Language
dc.contributor.author	De Carvalho Gomes, S
dc.contributor.author	Zhou, JL
dc.contributor.author	Zeng, X
dc.contributor.author	Long, G
dc.date.accessioned	2022-12-07T19:26:57Z
dc.date.available	2022-01-05
dc.date.available	2022-12-07T19:26:57Z
dc.date.issued	2022-03-15
dc.identifier.citation	Journal of Environmental Management, 2022, 306, pp. 1-9
dc.identifier.issn	0301-4797
dc.identifier.issn	1095-8630
dc.identifier.uri	http://hdl.handle.net/10453/164206
dc.description.abstract	Water treatment sludge was successfully thermally converted to obtain biochar as a stable material with resource potential. This research explored the application of sludge biochar as a supplementary cementitious material. The cement paste samples incorporating different amounts of sludge biochar were prepared, hardened, and analyzed for performance. The results show an improvement in hydration kinetics and mechanical properties of cement paste incorporating biochar, compared to raw sewage sludge. The mineralogical, thermal and microscopic analyses show evidence of pozzolanic activity of the biochar. The samples with 2% and 5% biochar showed higher heat release than the reference material. Specimens with 1%, 2% and 5% biochar showed a slightly higher compressive strength at 28 days compared to the reference material. Sludge conversion to biochar will incur an estimated cost of US$398.23/ton, which is likely to be offset by the substantial benefits from avoiding landfill and saving valuable cementitious materials. Therefore, this research has demonstrated that through conversion to biochar, water treatment sludge can be promoted as a sustainable and alternative cementitious material for cement with minimum environmental impacts, hence contributing to circular economy.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Environmental Management
dc.relation.isbasedon	10.1016/j.jenvman.2022.114463
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Charcoal
dc.subject.mesh	Construction Materials
dc.subject.mesh	Sewage
dc.subject.mesh	Water Purification
dc.subject.mesh	Charcoal
dc.subject.mesh	Construction Materials
dc.subject.mesh	Sewage
dc.subject.mesh	Water Purification
dc.subject.mesh	Charcoal
dc.subject.mesh	Sewage
dc.subject.mesh	Water Purification
dc.subject.mesh	Construction Materials
dc.title	Water treatment sludge conversion to biochar as cementitious material in cement composite.
dc.type	Journal Article
utslib.citation.volume	306
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	2024-03-01T00:00:00+1000Z
dc.date.updated	2022-12-07T19:25:58Z
pubs.publication-status	Published
pubs.volume	306

Abstract:

Water treatment sludge was successfully thermally converted to obtain biochar as a stable material with resource potential. This research explored the application of sludge biochar as a supplementary cementitious material. The cement paste samples incorporating different amounts of sludge biochar were prepared, hardened, and analyzed for performance. The results show an improvement in hydration kinetics and mechanical properties of cement paste incorporating biochar, compared to raw sewage sludge. The mineralogical, thermal and microscopic analyses show evidence of pozzolanic activity of the biochar. The samples with 2% and 5% biochar showed higher heat release than the reference material. Specimens with 1%, 2% and 5% biochar showed a slightly higher compressive strength at 28 days compared to the reference material. Sludge conversion to biochar will incur an estimated cost of US$398.23/ton, which is likely to be offset by the substantial benefits from avoiding landfill and saving valuable cementitious materials. Therefore, this research has demonstrated that through conversion to biochar, water treatment sludge can be promoted as a sustainable and alternative cementitious material for cement with minimum environmental impacts, hence contributing to circular economy.

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http://hdl.handle.net/10453/164206