Iron-based subsurface arsenic removal (SAR): Results of a long-term pilot-scale test in Vietnam
Article
Article Title | Iron-based subsurface arsenic removal (SAR): Results of a long-term pilot-scale test in Vietnam |
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ERA Journal ID | 4694 |
Article Category | Article |
Authors | Kurz, Edgardo E.Canas (Author), Luong, Vu T. (Author), Hellriegel, Ulrich (Author), Leidinger, Felix (Author), Luu, Tran L. (Author), Bundschuh, Jochen (Author) and Hoinkis, Jan (Author) |
Journal Title | Water Research |
Journal Citation | 181, pp. 1-11 |
Article Number | 115929 |
Number of Pages | 11 |
Year | 2020 |
Place of Publication | United Kingdom |
ISSN | 0043-1354 |
1879-2448 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.watres.2020.115929 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0043135420304668 |
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. |
Keywords | Subsurface arsenic mitigation, Mekong delta, Oxidation/adsorption, Zero-waste, Low-cost, Groundwater contamination |
ANZSRC Field of Research 2020 | 401199. Environmental engineering not elsewhere classified |
370302. Inorganic geochemistry | |
400403. Chemical engineering design | |
400411. Water treatment processes | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Karlsruhe University of Applied Sciences, Germany |
Vietnamese-German University, Vietnam | |
School of Civil Engineering and Surveying | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q76xv/iron-based-subsurface-arsenic-removal-sar-results-of-a-long-term-pilot-scale-test-in-vietnam
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