Arsenic Removal Via Softeningby Laurie McNeill, Univ of Colorado, Boulder, CO, USA,
Marc Edwards, Univ of Colorado, Boulder, CO, USA,
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 | pH | Magnesium | Water treatment | Solid mechanics | Sorption | Groundwater
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