The reduction in porosity of permeable reactive barriers due to bio-geochemical clogging caused by acidic groundwater flow

Medawela, S; Indraratna, B; Rowe, RK

The reduction in porosity of permeable reactive barriers due to bio-geochemical clogging caused by acidic groundwater flow

Medawela, S Indraratna, B

Rowe, RK

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Publisher:: Canadian Science Publishing
Publication Type:: Journal Article
Citation:: Canadian Geotechnical Journal, 0, (ja)

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Field	Value	Language
dc.contributor.author	Medawela, S
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-2346-8250
dc.contributor.author	Rowe, RK
dc.date.accessioned	2023-02-02T00:41:38Z
dc.date.available	2023-02-02T00:41:38Z
dc.identifier.citation	Canadian Geotechnical Journal, 0, (ja)
dc.identifier.issn	0008-3674
dc.identifier.issn	1208-6010
dc.identifier.uri	http://hdl.handle.net/10453/165821
dc.description.abstract	<jats:p> This study demonstrates the change in porosity of permeable reactive barrier (PRB) material when it reacts with acidic flow. The laboratory column test data obtained over nine months proves that the porosity of a granular limestone assembly decreases significantly due to bio-geochemical clogging caused by a continuous flow of acidic groundwater. The variations in pH, the pressure measurements, ion concentrations, and the results from X-ray diffraction suggest that clogging at the outlet of the column is much less than at the inlet. About 57% of the total reduction in porosity of the column is attributed to chemical clogging, while the remainder is mainly due to biological clogging. In this paper, a mathematical approach is proposed to estimate the reduction of reactive surface area based on changes in the pore volume. These proposed equations suggest that at the end of experimentation, the dissolution of calcite and bio-geochemical clogging can reduce the total surface area of limestone aggregates by more than 70%. The rigorous approach presented in this paper to determine the dominant clogging component within a granular filter at a given time is vital in estimating the longevity of a PRB and for planning its maintenance. </jats:p>
dc.language	en
dc.publisher	Canadian Science Publishing
dc.relation	http://purl.org/au-research/grants/arc/LP190100439
dc.relation.ispartof	Canadian Geotechnical Journal
dc.relation.isbasedon	10.1139/cgj-2022-0074
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0907 Environmental Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.title	The reduction in porosity of permeable reactive barriers due to bio-geochemical clogging caused by acidic groundwater flow
dc.type	Journal Article
utslib.citation.volume	0
utslib.for	0905 Civil Engineering
utslib.for	0907 Environmental 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
utslib.copyright.status	closed_access	*
dc.date.updated	2023-02-02T00:41:35Z
pubs.issue	ja
pubs.publication-status	Published online
pubs.volume	0
utslib.citation.issue	ja

Abstract:

This study demonstrates the change in porosity of permeable reactive barrier (PRB) material when it reacts with acidic flow. The laboratory column test data obtained over nine months proves that the porosity of a granular limestone assembly decreases significantly due to bio-geochemical clogging caused by a continuous flow of acidic groundwater. The variations in pH, the pressure measurements, ion concentrations, and the results from X-ray diffraction suggest that clogging at the outlet of the column is much less than at the inlet. About 57% of the total reduction in porosity of the column is attributed to chemical clogging, while the remainder is mainly due to biological clogging. In this paper, a mathematical approach is proposed to estimate the reduction of reactive surface area based on changes in the pore volume. These proposed equations suggest that at the end of experimentation, the dissolution of calcite and bio-geochemical clogging can reduce the total surface area of limestone aggregates by more than 70%. The rigorous approach presented in this paper to determine the dominant clogging component within a granular filter at a given time is vital in estimating the longevity of a PRB and for planning its maintenance.

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http://hdl.handle.net/10453/165821