AWWA JAW58362

More than 3,000 community water suppliers will have to treat for arsenic (As) removal as the US Environmental Protection Agency's new maximum contaminant level (MCL) requirements come into effect. The authors conducted this study to develop a method for minimizing the waste produced by As ion exchange during water treatment for As removal. They found that ion exchange with direct brine reuse is a more efficient and cost-effective process for removing As from groundwater than more commonly used processes. Salt consumption for regeneration is cut by 50%, and spent brine can be reused 10-15 times or more. This process will give communities a more cost-effective alternative for meeting new MCL requirements. Includes 19 references, tables, figures.