Chemical clogging of granular media under acidic groundwater conditions

Indraratna, B; Medawela, SK; Athuraliya, S; Heitor, A; Baral, P

Chemical clogging of granular media under acidic groundwater conditions

Indraratna, B

Medawela, SK Athuraliya, S

Heitor, A Baral, P

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Publisher:: Thomas Telford Ltd.
Publication Type:: Journal Article
Citation:: Environmental Geotechnics, 2021, pp. 1-12
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-9057-1514
dc.contributor.author	Medawela, SK
dc.contributor.author	Athuraliya, S https://orcid.org/0000-0001-8515-0240
dc.contributor.author	Heitor, A
dc.contributor.author	Baral, P
dc.date.accessioned	2022-01-16T04:10:53Z
dc.date.available	2022-01-16T04:10:53Z
dc.date.issued	2021-01-01
dc.identifier.citation	Environmental Geotechnics, 2021, pp. 1-12
dc.identifier.issn	2051-803X
dc.identifier.issn	2051-803X
dc.identifier.uri	http://hdl.handle.net/10453/153159
dc.description.abstract	Generation of acidic groundwater attributed to pyrite oxidation in low-lying acid sulfate soil has caused substantial damage to the soil-water environment and civil infrastructure in coastal Australia. The installation of permeable reactive barriers (PRBs) is a frontier technology in the field of acid neutralisation and removal of toxic heavy metal cations-for example, soluble iron (Fe) and aluminium (Al). This study aims to assess the potential of limestone (calcite) aggregates as the PRB's main reactive material in low-lying pyritic land. During long-term laboratory column experiments, a significant capacity of limestone for removing contaminant chemical species was observed. Nevertheless, the formation of secondary mineral precipitates upon geochemical reactivity within the granular media in the PRB caused armouring and chemical clogging, which diminished the rate of reactivity-that is, the treatment capacity of calcite aggregates-mainly at the entrance zone of the porous media. Flow properties were altered due to blockage of pores; for instance, hydraulic conductivity was reduced by 25% at the inlet zone. Non-homogeneous clogging towards the outlet was analysed, and the time-dependent effect on the longevity of a limestone column was studied and quantified.
dc.language	en
dc.publisher	Thomas Telford Ltd.
dc.relation.ispartof	Environmental Geotechnics
dc.relation.isbasedon	10.1680/jenge.18.00143
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0907 Environmental Engineering
dc.title	Chemical clogging of granular media under acidic groundwater conditions
dc.type	Journal Article
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	2022-01-16T04:10:51Z
pubs.publication-status	Published

Abstract:

Generation of acidic groundwater attributed to pyrite oxidation in low-lying acid sulfate soil has caused substantial damage to the soil-water environment and civil infrastructure in coastal Australia. The installation of permeable reactive barriers (PRBs) is a frontier technology in the field of acid neutralisation and removal of toxic heavy metal cations-for example, soluble iron (Fe) and aluminium (Al). This study aims to assess the potential of limestone (calcite) aggregates as the PRB's main reactive material in low-lying pyritic land. During long-term laboratory column experiments, a significant capacity of limestone for removing contaminant chemical species was observed. Nevertheless, the formation of secondary mineral precipitates upon geochemical reactivity within the granular media in the PRB caused armouring and chemical clogging, which diminished the rate of reactivity-that is, the treatment capacity of calcite aggregates-mainly at the entrance zone of the porous media. Flow properties were altered due to blockage of pores; for instance, hydraulic conductivity was reduced by 25% at the inlet zone. Non-homogeneous clogging towards the outlet was analysed, and the time-dependent effect on the longevity of a limestone column was studied and quantified.

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http://hdl.handle.net/10453/153159