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Characteristics of Fe and Mn bearing precipitates generated by Fe(II) and Mn(II) co-oxidation with O-2, MnO4 and HOCl in the presence of groundwater ions
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. KWR Water Cycle Res Inst, Nieuwegein, Netherlands.;WUR, Dept Environm Technol, Wageningen, Netherlands.;Evides Water Co NV, Rotterdam, Netherlands.. (KTH-International Groundwater Arsenic Research Group)
WUR, Dept Environm Technol, Wageningen, Netherlands.;Evides Water Co NV, Rotterdam, Netherlands..
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. Univ Southern Queensland, Int Ctr Appl Climate Sci, Toowoomba, Qld, Australia.. (KTH-International Groundwater Arsenic Research Group)ORCID iD: 0000-0003-4350-9950
Geol Survey Denmark & Greenland GEUS, Geochem Dept, Copenhagen, Denmark.;Univ Utrecht, Fac Geosci, Dept Earth Sci Geochem, Utrecht, Netherlands..
2019 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 161, p. 505-516Article in journal (Refereed) Published
Abstract [en]

In this work, we combined macroscopic measurements of precipitate aggregation and chemical composition (Mn/Fe solids ratio) with Fe and Mn K-edge X-ray absorption spectroscopy to investigate the solids formed by co-oxidation of Fe(II) and Mn(II) with O-2, MnO4, and HOCl in the presence of groundwater ions. In the absence of the strongly sorbing oxyanions, phosphate (P) and silicate (Si), and calcium (Ca), O-2 and HOCl produced suspensions that aggregated rapidly, whereas co-oxidation of Fe(II) and Mn(II) by MnO4 generated colloidally stable suspensions. The aggregation of all suspensions decreased in P and Si solutions, but Ca counteracted these oxyanion effects. The speciation of oxidized Fe and Mn in the absence of P and Si also depended on the oxidant, with O-2 producing Mn(III)-incorporated lepidocrocite (Mn/Fe = 0.01-0.02 mol/mol), HOCl producing Mn(III)-incorporated hydrous ferric oxide (HFO) (Mn/Fe = 0.08 mol/mol), and MnO4 producing poorly-ordered MnO2 and HFO (Mn/Fe > 0.5 mol/mol). In general, the presence of P and Si decreased the crystallinity of the Fe(III) phase and increased the Mn/Fe solids ratio, which was found by Mn K-edge XAS analysis to be due to an increase in surface-bound Mn(II). By contrast, Ca decreased the Mn/Fe solids ratio and decreased the fraction of Mn(II) associated with the solids, suggesting that Ca and Mn(II) compete for sorption sites. Based on these results, we discuss strategies to optimize the design (i.e. filter bed operation and chemical dosing) of water treatment plants that aim to remove Fe(II) and Mn(II) by co-oxidation.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 161, p. 505-516
Keywords [en]
Mn and Fe removal, Drinking water, Filtration, Iron and manganese oxidation and precipitation, Groundwater treatment, X-ray absorption spectroscopy
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-255542DOI: 10.1016/j.watres.2019.06.036ISI: 000475999400050PubMedID: 31229731OAI: oai:DiVA.org:kth-255542DiVA, id: diva2:1340362
Note

QC 20190805

Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-05Bibliographically approved

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Ahmad, ArslanBhattacharya, Prosun

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