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Influence of Anions of the Removal of Arsenic by Co-Precipitation and Long-Term Stability of Ferrehydrite and Modified FerrihydrtiePrincipal Investigator: Dr. Larry Twidwell Arsenic removal by adsorption on a ferri-oxyhydroxide (ferrihydrite) surface is EPA's Best Demonstrated Available Technology (BDAT). This technology is used throughout the industry for removing arsenic from waste waters; however, long term stability of ferrihydrite is questionable. It was observed in previous work (MWTP Activity IV, Project 31) that the removal of arsenate from solution appeared to be greatly influenced by the choice of the ferric salt compound chosen as the iron reagent. This unexpected observation warranted further investigation; thus, this project will evaluate the influence of anion type on the removal of arsenic from wastewater and drinking waters. Study variables will include anion type (chloride, nitrate, and sulfate), anion mixture ratios of sulfate/chloride, Fe/As, and (Fe+Al)/As, initial arsenic concentration, and pH. Long term elevated temperature studies will be conducted to investigate the relative stability of the products. Project work began in April 2006. MWTP Activity IV, Project 39
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