Arsenite removal in groundwater treatment plants by sequential Permanganate―Ferric treatment

Ahmad, Arslan and Cornelissen, Emile and van de Wetering, Stephan and van Dijk, Tim and van Genuchten, Case and Bundschuh, Jochen and van der Wal, Albert and Bhattacharya, Prosun (2018) Arsenite removal in groundwater treatment plants by sequential Permanganate―Ferric treatment. Journal of Water Process Engineering, 26. pp. 221-229. ISSN 2214-7144

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 28 Feb 2019 03:31
Last Modified: 28 Feb 2019 04:31
Uncontrolled Keywords: arsenic removal; arsenite oxidation; drinking water; groundwater treatment; permanganate; rapid sand filtration
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Identification Number or DOI: 10.1016/j.jwpe.2018.10.014
URI: http://eprints.usq.edu.au/id/eprint/36003

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