Arsenite removal in groundwater treatment plants by sequential Permanganate―Ferric treatment
Article
Article Title | Arsenite removal in groundwater treatment plants by sequential Permanganate―Ferric treatment |
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ERA Journal ID | 211030 |
Article Category | Article |
Authors | Ahmad, Arslan (Author), Cornelissen, Emile (Author), van de Wetering, Stephan (Author), van Dijk, Tim (Author), van Genuchten, Case (Author), Bundschuh, Jochen (Author), van der Wal, Albert (Author) and Bhattacharya, Prosun (Author) |
Journal Title | Journal of Water Process Engineering |
Journal Citation | 26, pp. 221-229 |
Number of Pages | 9 |
Year | 2018 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 2214-7144 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jwpe.2018.10.014 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S2214714418305221 |
Abstract | The Dutch drinking water sector is actively investigating methods to reduce arsenic (As) to <1 μg/L in drinking water supply. We investigated (1) the effectiveness of sequential permanganate (MnO4¯)–ferric (Fe(III)) dosing during aeration–rapid sand filtration to achieve <1 μg/L As (2) the influence of MnO4¯–Fe(III) dosing on pre-established removal patterns of As(III), Fe(II), Mn(II) and NH4 + in rapid sand filters and (3) the influence of MnO4¯–Fe(III) dosing on the settling and molecular-scale structural properties of the filter backwash solids. We report that MnO4¯–Fe(III) dosing is an effective technique to improve arsenite [As(III)] removal at groundwater treatment plants. At a typical aeration—rapid sand filtration facility in the Netherlands effluent As concentrations of <1 μg/L were achieved with 1.2 mg/L MnO4 ¯–and 1.8 mg/L Fe(III). The optimized combination of MnO4¯–and Fe(III) doses did not affect the removal efficiency of Fe(II), Mn(II) and NH4 + in rapid sand filters, however, the removal patterns of Fe(II) and Mn(II) in rapid sand filter were altered, as well as the settling behaviour of backwash solids. The characterization of backwash solids by Fe K-edge X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) showed that the changed settling velocity of backwash solids with MnO4¯–Fe(III) in place was not due to changes in the molecular-scale structure of Fe-precipitates that constitute the major portion of the backwash solids. |
Keywords | arsenic removal; arsenite oxidation; drinking water; groundwater treatment; permanganate; rapid sand filtration |
ANZSRC Field of Research 2020 | 410402. Environmental assessment and monitoring |
370799. Hydrology not elsewhere classified | |
410404. Environmental management | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Wageningen University, Netherlands |
Nanyang Technological University, Singapore | |
Brabant Water NV, Netherlands | |
Utrecht University, Netherlands | |
International Centre for Applied Climate Science | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q523q/arsenite-removal-in-groundwater-treatment-plants-by-sequential-permanganate-ferric-treatment
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