Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier

Landfills poses a potential threat to human health and environment due to detrimental effects of toxic pollutants. Leachate is one of the most serious environmental hazards associated with landfills. This study aims to identify the most significant heavy metal pollutant in leachate from landfills in...

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Main Author:	Hussein, Munirah
Format:	Thesis
Language:	English
Published:	2022
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/100368/1/MunirahHusseinPMJIIT2022.pdf
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spelling	my-utm-ep.1003682023-04-13T02:23:08Z Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier 2022 Hussein, Munirah Q Science (General) Landfills poses a potential threat to human health and environment due to detrimental effects of toxic pollutants. Leachate is one of the most serious environmental hazards associated with landfills. This study aims to identify the most significant heavy metal pollutant in leachate from landfills in Malaysia and to assess the potential of natural and locally available soil as reactive media for permeable reactive barrier (PRB) systems for leachate treatment. The data collection sites consist of seven landfills in Negeri Sembilan and Melaka. The leachate and soil from the seven landfills were analysed. The analyses of the leachate contamination potentials and environmental impacts of the landfills area involved the investigation of these indexes; quality rating scales (QRS), leachate pollution index (LPI), geo-accumulation index (Igeo), pollution index (PI) and integrated pollution index (IPI). In this study, ten types of locally available soil were screened for their capability to remove arsenic. Batch and column studies were conducted to determine the most effective soil for reactive media in PRB system in terms of adsorption capacity, retention and dispersion properties. Maximum QRS values of arsenic (787) and LPI of 15.28 in Ulu Maasop landfill denoted progressive deterioration of leachate contamination especially in non-sanitary landfills (dumpsites). The difference in IPI values for sanitary (IPI > 1) and for non-sanitary landfill soil (IPI < 1) confirmed advanced decline of the soil quality in non-sanitary landfills. Arsenic was identified as the pollutant of concern based on the contamination potential in leachate and the impacts to the soil in vicinity of the landfill. Ulu Maasop soil (UMS3) was selected based on high arsenic adsorption capacities (0.31 mg/g for initial concentration of 50 mg/L) and also removal of heavy metals in real leachate via batch adsorption test. From column studies, UMS3 soil showed to have retardation factor of 32.7 which may reduce mobility of arsenic in the contaminant plume. Mineral compounds such as hematite, baumite and calcite in UMS3 soil proved to have significant effects on arsenic removal. XPS findings revealed that mechanisms of arsenic adsorption onto UMS3 soil were probably via oxidation, surface complexation and ligand exchange with hydroxyl groups. Hence, UMS3 soil is a good candidate for reactive barrier system proposed for arsenic mitigation in landfill due to its high adsorption capacities, high retention and dispersive characteristics. 2022 Thesis http://eprints.utm.my/id/eprint/100368/ http://eprints.utm.my/id/eprint/100368/1/MunirahHusseinPMJIIT2022.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:151021 phd doctoral Universiti Teknologi Malaysia, Malaysia-Japan International Institute of Technology Malaysia-Japan International Institute of Technology
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	Q Science (General)
spellingShingle	Q Science (General) Hussein, Munirah Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier
description	Landfills poses a potential threat to human health and environment due to detrimental effects of toxic pollutants. Leachate is one of the most serious environmental hazards associated with landfills. This study aims to identify the most significant heavy metal pollutant in leachate from landfills in Malaysia and to assess the potential of natural and locally available soil as reactive media for permeable reactive barrier (PRB) systems for leachate treatment. The data collection sites consist of seven landfills in Negeri Sembilan and Melaka. The leachate and soil from the seven landfills were analysed. The analyses of the leachate contamination potentials and environmental impacts of the landfills area involved the investigation of these indexes; quality rating scales (QRS), leachate pollution index (LPI), geo-accumulation index (Igeo), pollution index (PI) and integrated pollution index (IPI). In this study, ten types of locally available soil were screened for their capability to remove arsenic. Batch and column studies were conducted to determine the most effective soil for reactive media in PRB system in terms of adsorption capacity, retention and dispersion properties. Maximum QRS values of arsenic (787) and LPI of 15.28 in Ulu Maasop landfill denoted progressive deterioration of leachate contamination especially in non-sanitary landfills (dumpsites). The difference in IPI values for sanitary (IPI > 1) and for non-sanitary landfill soil (IPI < 1) confirmed advanced decline of the soil quality in non-sanitary landfills. Arsenic was identified as the pollutant of concern based on the contamination potential in leachate and the impacts to the soil in vicinity of the landfill. Ulu Maasop soil (UMS3) was selected based on high arsenic adsorption capacities (0.31 mg/g for initial concentration of 50 mg/L) and also removal of heavy metals in real leachate via batch adsorption test. From column studies, UMS3 soil showed to have retardation factor of 32.7 which may reduce mobility of arsenic in the contaminant plume. Mineral compounds such as hematite, baumite and calcite in UMS3 soil proved to have significant effects on arsenic removal. XPS findings revealed that mechanisms of arsenic adsorption onto UMS3 soil were probably via oxidation, surface complexation and ligand exchange with hydroxyl groups. Hence, UMS3 soil is a good candidate for reactive barrier system proposed for arsenic mitigation in landfill due to its high adsorption capacities, high retention and dispersive characteristics.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Hussein, Munirah
author_facet	Hussein, Munirah
author_sort	Hussein, Munirah
title	Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier
title_short	Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier
title_full	Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier
title_fullStr	Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier
title_full_unstemmed	Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier
title_sort	removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier
granting_institution	Universiti Teknologi Malaysia, Malaysia-Japan International Institute of Technology
granting_department	Malaysia-Japan International Institute of Technology
publishDate	2022
url	http://eprints.utm.my/id/eprint/100368/1/MunirahHusseinPMJIIT2022.pdf
_version_	1776100684140118016

Removal of arsenic from landfill leachate by natural soil adsorption for potential use as a permeable reactive barrier

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