Iron-based subsurface arsenic removal (SAR): Results of a long-term pilot-scale test in Vietnam

Kurz, Edgardo E.Canas and Luong, Vu T. and Hellriegel, Ulrich and Leidinger, Felix and Luu, Tran L. and Bundschuh, Jochen and Hoinkis, Jan (2020) Iron-based subsurface arsenic removal (SAR): Results of a long-term pilot-scale test in Vietnam. Water Research, 181:115929. pp. 1-11. ISSN 0043-1354


Abstract

The principle of subsurface arsenic removal (SAR) from groundwater is based on oxidation and adsorption reactions by infiltrating oxygen into the anoxic aquifer and the immobilization of arsenic (As) onto freshly formed iron (Fe)-(hydr)oxides. In this study, a pilot-scale plant for SAR has been subject to long term testing in the Mekong Delta, Vietnam. Initial concentrations of Fe (8.4 ± 1.3 mg L−1) and As (81 ± 8 μg L−1) in the exploited groundwater were successfully lowered to below the WHO guideline value limits for drinking water of 0.3 mg L−1 and 10 μg L−1, respectively. Adsorption and co-precipitation of As with Fe-(hydr)oxides could be identified as the principal mechanism responsible for the As removal from groundwater, demonstrating the feasibility of SAR as a low-cost and zero-waste solution over a period of two years. However, naturally occurring geochemical reducing conditions and high ammonium levels in the groundwater delayed the removal of manganese (Mn). An additional post-treatment filtration for Mn-removal was temporarily used to comply with the Vietnamese drinking water standard until a Mn-mitigation was achieved by the SAR process. In contrast to most As-remediation technologies, SAR appears to be a long-term, sustainable treatment option with the salient advantage of negligible production of toxic waste, which with ex-situ processes require additionally management costs.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Date Deposited: 20 Jun 2022 03:17
Last Modified: 21 Jun 2022 04:28
Uncontrolled Keywords: Subsurface arsenic mitigation, Mekong delta, Oxidation/adsorption, Zero-waste, Low-cost, Groundwater contamination
Fields of Research (2008): 09 Engineering > 0904 Chemical Engineering > 090403 Chemical Engineering Design
04 Earth Sciences > 0402 Geochemistry > 040202 Inorganic Geochemistry
09 Engineering > 0904 Chemical Engineering > 090410 Water Treatment Processes
09 Engineering > 0907 Environmental Engineering > 090799 Environmental Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4011 Environmental engineering > 401199 Environmental engineering not elsewhere classified
37 EARTH SCIENCES > 3703 Geochemistry > 370302 Inorganic geochemistry
40 ENGINEERING > 4004 Chemical engineering > 400403 Chemical engineering design
40 ENGINEERING > 4004 Chemical engineering > 400411 Water treatment processes
Identification Number or DOI: https://doi.org/10.1016/j.watres.2020.115929
URI: http://eprints.usq.edu.au/id/eprint/49148

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