AWWA ACE70843

This powerpoint presentation begins by providing a brief overview of the Arsenic Rule and arsenic in the groundwater of the southwestern U.S. Water quality characteristics are presented, along with adsorptive treatment technology, and initial pilot testing results. Test procedure included: chlorinate water prior to treatment; reduce pH to 7.1 using sulfuric acid; and, test a titanium-based media (METSORB) and an iron-based media (Bay Oxide E33) concurrently. Percentage removal of As, U, and V by both METSORB and Bay Oxide are provided, along with arsenic breakthrough curves for both METSORB and Bay Oxide, six hour leaching trends for both processes, six hour uranium leaching trends, and six hour vanadium leaching. Study conclusions indicate that: high pH, uranium, and vanadium complicate arsenic removal by adsorption; uranium and vanadium may compete with arsenic for adsorptive sites; adsorption of uranium can generate a low level radioactive waste; pH adjustment with adsorptive technology introduces the risk of exposing consumers to high concentrations of arsenic and other contaminants; and, pilot testing is essential to evaluate the feasibility of an arsenic treatment system. Includes figures.