Precipitative Removal of As, Ba, B, Cr, Sr, and V Using Sodium Carbonate |
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| Authors: | Jeffrey L. Parks Marc Edwards |
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| Affiliation: | 1Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Virginia Polytechnic and State Univ., 418 Durham Hall, Blacksburg, VA 24061. E-mail: jparks@vt.edu
2Associate Professor, Dept. of Civil and Environmental Engineering, Virginia Polytechnic and State Univ., 418 Durham Hall, Blacksburg, VA 24061 (corresponding author). E-mail: edwardsm@vt.edu
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| Abstract: | Sodium carbonate softening at pH 10.3 is a viable method of removing the inorganic contaminants arsenic, barium, chromium, strontium, and vanadium from drinking water sources. A broad survey revealed that removals varied widely and were dependent on solution composition. Median removals of As, Ba, Cr, Sr, and V were 24, 100, 92, 99, and 60%, respectively. Linear and nonlinear empirical models were fit for crudely estimating the removal of these contaminants in the presence of other elements that are typically removed in the softening process (i.e., calcium, magnesium, silicon, iron, and aluminum). Boron was removed to a much lesser extent (median removal 2%) indicating soda ash softening is not a promising treatment option for this purpose. |
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| Keywords: | Arsenic Chromium Inorganic chemicals Regression models Softening Water treatment |
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