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Arsenite removal in groundwater treatment plants by sequential Permanganate-Ferric treatment
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Sustainability and Environmental Engineering. KWR Water Cycle Res Inst, Nieuwegein, Netherlands.;WUR, Dept Environm Technol, Wageningen, Netherlands.. (KTH Int Groundwater Arsen Res Grp)
KWR Water Cycle Res Inst, Nieuwegein, Netherlands.;Nanyang Technol Univ, Nanyang Environm & Water Res Inst, Singapore Membrane Technol Ctr, Singapore, Singapore.;Univ Ghent, Particle & Interfacial Technol Grp, Ghent, Belgium..
Brabant Water NV Breda, Breda, Netherlands..
Brabant Water NV Breda, Breda, Netherlands..
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2018 (English)In: JOURNAL OF WATER PROCESS ENGINEERING, ISSN 2214-7144, Vol. 26, p. 221-229Article in journal (Refereed) Published
Abstract [en]

The Dutch drinking water sector is actively investigating methods to reduce arsenic (As) to < 1 mu g/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 mu g/L As (2) the influence of MnO4--Fe(III) dosing on preestablished 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 mu g/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.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 26, p. 221-229
Keywords [en]
Arsenic removal, Arsenite oxidation, Drinking water, Groundwater treatment, Permanganate, Rapid sand filtration
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-239976DOI: 10.1016/j.jwpe.2018.10.014ISI: 000450943700024Scopus ID: 2-s2.0-85055672970OAI: oai:DiVA.org:kth-239976DiVA, id: diva2:1269689
Note

QC 20181211

Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2019-04-09Bibliographically approved

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Bhattacharya, Prosun

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