Optimizing arsenic removal during iron removal: Theoretical and practical considerations (2005)

Research Article| December 01 2005 Optimizing arsenic removal during iron removal: Theoretical and practical considerations D. A. Lytle; D. A. Lytle 1US Environmental Protection Agency, 26 W. Martin Luther King Dr.,Cincinnati, OH 45268, USA Tel: (513) 569-7432 Fax: (513) 569-7172; E-mail: lytle.darren@epa.gov Search for other works by this author on: This Site PubMed Google Scholar T. J. Sorg; T. J. Sorg 1US Environmental Protection Agency, 26 W. Martin Luther King Dr.,Cincinnati, OH 45268, USA Search for other works by this author on: This Site PubMed Google Scholar V. L. Snoeyink V. L. Snoeyink 2Department of Civil and Environmental Engineering, University of Illinois, 205 N. Mathews, Urbana, IL 61801, USA Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2005) 54 (8): 545–560. https://doi.org/10.2166/aqua.2005.0048 Article history Received: July 18 2004 Accepted: September 20 2005 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 D. A. Lytle, T. J. Sorg, V. L. Snoeyink; Optimizing arsenic removal during iron removal: Theoretical and practical considerations. Journal of Water Supply: Research and Technology-Aqua 1 December 2005; 54 (8): 545–560. doi: https://doi.org/10.2166/aqua.2005.0048 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex New health effects research prompted the United States Environmental Protection Agency (USEPA) to reduce the drinking water standard for arsenic from 0.05 to 0.010 mg l−1 (10 μg l−1), and as a result many drinking water systems (particularly smaller ones) throughout the country will no longer be in compliance. In waters that contain natural iron, arsenic removal can be achieved during iron removal, but the effectiveness of iron to remove arsenic depends on many variables. The objective of this study was to identify the operational and water quality factors that impact arsenic removal during iron removal. Bench-scale ('batch' and standard jar) tests were used to evaluate the effects of pH, phosphate, other water chemistry variables, and the oxidant used to oxidize Fe(II) on the removal of arsenic. Treatment operation considerations, including sequence of oxidant addition and contact time, were also considered. Results showed that (1) arsenic removal improves with increasing iron concentration and particle surface area; (2) freshly precipitated iron particles had a much greater capacity to remove arsenic than preformed particles that were formed by oxidation of ferrous iron with either oxygen or chlorine; (3) chlorination, or application of a stronger oxidant, may be necessary to improve arsenic removal at many drinking water treatment plants; (4) the point of strong oxidant addition in the treatment train is important; and (5) the pH and other competing water quality variables such as phosphate play significant roles in the amount of arsenic removed. arsenic, iron, optimizing removal, oxidant, water This content is only available as a PDF. © US Government You do not currently have access to this content.