Selective removal of arsenic in water: A critical review

Weerasundara, Lakshika ORCID: https://orcid.org/0000-0002-2421-077X and Ok, Yong-Sik and Bundschuh, Jochen (2021) Selective removal of arsenic in water: A critical review. Environmental Pollution, 268 (Part B):115668. pp. 1-19. ISSN 0269-7491

[img]
Preview
Text (Accepted Version)
Initial submission.pdf
Available under License Creative Commons Attribution 4.0.

Download (553kB) | Preview

Abstract

Selective removal of arsenic (As) is the key challenge for any of As removal mechanisms as this not only increases the efficiency of removal of the main As species (neutral As(III) and As(V) hydroxyl-anions) but also allows for a significant reduction of waste as it does not co-remove other solutes. Selective removal has a number of benefits: it increases the capacity and lifetime of units while lowering the cost of the process. Therefore, a sustainable selective mitigation method should be considered concerning the economic resources available, the ability of infrastructure to sustain water treatment, and the options for reuse and/or safe disposal of treatment residuals. Several methods of selective As removal have been developed, such as precipitation, adsorption and modified iron and ligand exchange. The biggest challenge in selective removal of As is the presence of phosphate in water which is chemically comparable with As(V). There are two types of mechanisms involved with As removal: Coulombic or ion exchange; and Lewis acid-base interaction. Solution pH is one of the major controlling factors limiting removal efficiency since most of the above-mentioned methods depend on complexation through electrostatic effects. The different features of two different As species make the selective removal process more difficult, especially under natural conditions. Most of the selective As removal methods involve hydrated Fe(III) oxides through Lewis acid-base interaction. Microbiological methods have been studied recently for selective removal of As, and although there have been only a small number of studies, the method shows remarkable results and indicates positive prospects for the future.


Statistics for USQ ePrint 41236
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Date Deposited: 17 Feb 2021 02:04
Last Modified: 17 Feb 2021 02:04
Uncontrolled Keywords: Selective Arsenic removal from water; Competitive ions impacting removal; Waste reduction; Cost reduction
Fields of Research (2008): 05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Fields of Research (2020): 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410402 Environmental assessment and monitoring
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9608 Flora, Fauna and Biodiversity > 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity
D Environment > 96 Environment > 9609 Land and Water Management > 960912 Urban and Industrial Water Management
Socio-Economic Objectives (2020): 18 ENVIRONMENTAL MANAGEMENT > 1803 Fresh, ground and surface water systems and management > 180307 Rehabilitation or conservation of fresh, ground and surface water environments
Identification Number or DOI: https://doi.org/10.1016/j.envpol.2020.115668
URI: http://eprints.usq.edu.au/id/eprint/41236

Actions (login required)

View Item Archive Repository Staff Only