Low-cost laterite-laden household filters for removing arsenic from groundwater in Vietnam and waste management

Nguyen, TH; Nguyen, AT; Loganathan, P; Nguyen, TV; Vigneswaran, S; Nguyen, THH; Tran, HN

Low-cost laterite-laden household filters for removing arsenic from groundwater in Vietnam and waste management

Nguyen, TH Nguyen, AT Loganathan, P Nguyen, TV Vigneswaran, S

Nguyen, THH Tran, HN

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Process Safety and Environmental Protection, 2021, 152, pp. 154-163
Issue Date:: 2021-08-01

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Field	Value	Language
dc.contributor.author	Nguyen, TH
dc.contributor.author	Nguyen, AT
dc.contributor.author	Loganathan, P
dc.contributor.author	Nguyen, TV
dc.contributor.author	Vigneswaran, S https://orcid.org/0000-0002-8117-4322
dc.contributor.author	Nguyen, THH
dc.contributor.author	Tran, HN
dc.date.accessioned	2021-07-18T13:21:38Z
dc.date.available	2021-07-18T13:21:38Z
dc.date.issued	2021-08-01
dc.identifier.citation	Process Safety and Environmental Protection, 2021, 152, pp. 154-163
dc.identifier.issn	0957-5820
dc.identifier.uri	http://hdl.handle.net/10453/149891
dc.description.abstract	This study evaluated the performance of a low-cost natural laterite from Thach That (NLTT), Vietnam, for its capacity to remove arsenic (As) in a household filter with contaminated groundwater. The NLTT was initially tested in a laboratory column trial lasting 800 h. The breakthrough curves were found to fit the Thomas model very satisfactorily with adsorption capacities of 0.06 and 0.20 mg/g at a flow velocity of 0.85 m/h for the influent As(V) concentrations of 0.1 and 0.5 mg/L, respectively. In household filters at four sites, the median As concentration in groundwaters (0.04–0.19 mg/L) dropped to 0.026–0.054 mg/L after traditional sand filtration. However, following subsequent NLTT filtration through columns (14 cm inner diameter, 65 cm height) at 0.65 m/h flow velocity, it fell to below the Vietnam and WHO drinking water standard (0.01 mg/L) during seven months of continuous operation. Portland cement and lime were tested as binding agents for the exhausted NLTT waste in a solidification/stabilization process at different ratios. The best ratio of exhausted NLTT: Portland cement: lime for restraining mobility of As from this waste was 3:1:0.5. The concrete brick products exhibited a suitable compressive strength for using it as building materials in construction work.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Process Safety and Environmental Protection
dc.relation.isbasedon	10.1016/j.psep.2021.06.002
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0904 Chemical Engineering, 0914 Resources Engineering and Extractive Metallurgy, 0102 Applied Mathematics, 0911 Maritime Engineering
dc.subject.classification	Chemical Engineering
dc.subject.classification	Strategic, Defence & Security Studies
dc.title	Low-cost laterite-laden household filters for removing arsenic from groundwater in Vietnam and waste management
dc.type	Journal Article
utslib.citation.volume	152
utslib.for	0904 Chemical Engineering
utslib.for	0914 Resources Engineering and Extractive Metallurgy
utslib.for	0102 Applied Mathematics
utslib.for	0911 Maritime 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	open_access	*
utslib.copyright.embargo	2023-08-01T00:00:00+1000Z
dc.date.updated	2021-07-18T13:21:34Z
pubs.publication-status	Accepted
pubs.volume	152

Abstract:

This study evaluated the performance of a low-cost natural laterite from Thach That (NLTT), Vietnam, for its capacity to remove arsenic (As) in a household filter with contaminated groundwater. The NLTT was initially tested in a laboratory column trial lasting 800 h. The breakthrough curves were found to fit the Thomas model very satisfactorily with adsorption capacities of 0.06 and 0.20 mg/g at a flow velocity of 0.85 m/h for the influent As(V) concentrations of 0.1 and 0.5 mg/L, respectively. In household filters at four sites, the median As concentration in groundwaters (0.04–0.19 mg/L) dropped to 0.026–0.054 mg/L after traditional sand filtration. However, following subsequent NLTT filtration through columns (14 cm inner diameter, 65 cm height) at 0.65 m/h flow velocity, it fell to below the Vietnam and WHO drinking water standard (0.01 mg/L) during seven months of continuous operation. Portland cement and lime were tested as binding agents for the exhausted NLTT waste in a solidification/stabilization process at different ratios. The best ratio of exhausted NLTT: Portland cement: lime for restraining mobility of As from this waste was 3:1:0.5. The concrete brick products exhibited a suitable compressive strength for using it as building materials in construction work.

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http://hdl.handle.net/10453/149891