Abstract
Research Article| August 01 2003 Removal of chromium(VI) from drinking water by redox-assisted coagulation with iron(II) Giehyeon Lee; Giehyeon Lee 1California Institute of Technology, 1200 E. California Blvd, Environmental Science and Engineering (138-78), Pasadena, California 91125, USA Search for other works by this author on: This Site PubMed Google Scholar Janet G. Hering Janet G. Hering 1California Institute of Technology, 1200 E. California Blvd, Environmental Science and Engineering (138-78), Pasadena, California 91125, USA Tel: +1 (626) 395-3644 Fax: +1 (626) 395-2940; E-mail: jhering@caltech.edu Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2003) 52 (5): 319–332. https://doi.org/10.2166/aqua.2003.0030 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Twitter LinkedIn Tools Icon Tools Cite Icon Cite Permissions Search Site Search nav search search input Search input auto suggest search filter All ContentAll JournalsThis Journal Search Advanced Search Citation Giehyeon Lee, Janet G. Hering; Removal of chromium(VI) from drinking water by redox-assisted coagulation with iron(II). Journal of Water Supply: Research and Technology-Aqua 1 August 2003; 52 (5): 319–332. doi: https://doi.org/10.2166/aqua.2003.0030 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Batch experiments were conducted to determine whether sub-ppb concentrations of dissolved Cr(VI) could be achieved by redox-assisted coagulation with Fe(II). In this process Fe(II) acts as a reductant for Cr(VI) and, after its oxidation to Fe(III), as a coagulant. With an Fe(II) dose of 30 μM (1.7 mg/l as Fe), dissolved Cr(VI) concentrations in synthetic or natural Colorado River water (CRW) at pH 8.2 could be decreased from an initial value of 1 μM (52 µg/l) to <0.01 μM (<0.5 µg/l) corresponding to a >99% removal efficiency. In contrast, removal of Cr(VI) by coagulation with Fe(III) was poor, even at higher Fe(III) doses (up to 100 μM). The efficiency of Cr(VI) removal by redox-assisted coagulation decreased at lower (but still above stoichiometric) Fe(II) doses due to the incomplete reduction of Cr(VI) to Cr(III), which, under our experimental conditions, can be attributed to the competing reaction of Fe(II) with O2 between pH 7 and 8.2 and to the slow kinetics of reaction of Fe(II) with Cr(VI) between pH 6.5 and 7. Although Cr(VI) was less efficiently removed from natural or synthetic CRW than from the simple electrolyte solution, the desired level of removal could be achieved by increasing the Fe(II) dose. chromate, co-precipitation, ferric, ferrous, sorption, water treatment This content is only available as a PDF. © IWA Publishing 2003 You do not currently have access to this content.
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