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Modified Ferrihydrite for Enhanced Removal of Dissolved Metals from Mine WastewaterPrincipal Investigator: Dr. Larry Twidwellltwidwell@mtech.edu Ferrihydrite adsorption of dissolved heavy metals is widely used throughout the world. Twidwell and Hohn (MWTP Activity IV, Project 31) have previously demonstrated that arsenic can be more effectively removed from solution by adsorption/coprecipitation using aluminum-modified ferrihydrite (AMF) compared to using ferrihydrite. This ongoing project further explores the possibilities of AMF by investigating dissolved heavy metals (Cd, Cu, Ni, and Zn) removal by adsorption/coprecipitation with AMF. Specific objectives are to investigate the adsorption characteristics of ferrihydrite and AMF for the removal of dissolved heavy metals under conditions that vary with respect to the Fe/metal or Fe+Al/metal mole ratio, the Al/Fe mole ratio in the AMF, and pH. Additionally, both room and elevated temperature aging tests are being employed to test the relative stability of metal loaded ferrihydrite and AMF. Thus far, it has been found that AMF is not superior to ferrihydrite for removing heavy metals from waste streams. Aging studies are not yet complete, thus a comparison of ferrihydrite versus AMF aged samples has not been made. MWTP Activity IV, Project 35
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