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Arsenic Removal Via Softening

by Laurie McNeill, Univ of Colorado, Boulder, CO, USA,
Marc Edwards, Univ of Colorado, Boulder, CO, USA,



Document Type: Proceeding Paper

Part of: Critical Issues in Water and Wastewater Treatment

Abstract:

The removal of arsenic during softening was investigated using synthetic solutions. Arsenic removal is facilitated by formation of a variety of solids including Mg(OH)₂, calcite and Mn(OH)₂. At pH > 11.0 arsenic removal was independent of magnesium concentration for initial concentrations of 20 or 50 mg/L Mg⁺², but arsenic removal was improved at lower pHs at the higher initial magnesium concentration. For systems initially containing only Mn⁺², arsenic removal appears to be through sorption onto Mn(OH)₂ solids rather than due to formation of a Mn₃(AsO₄)₂ precipitate. The presence of trace amounts of orthophosphate hindered overall removal of arsenic from synthetic groundwater solutions.

Subject Headings: Arsenic | Water treatment | pH | Magnesium | Water pollution | Sorption | Groundwater management

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