AWWA ACE61768

This slide presentation outlines information on testing a new ion exchanger (Polymeric Ligand Exchanger-PLE) for selective removal of As(V), and developing an engineered strategy to minimize process waste residuals. Topics covered include: arsenate-sulfate breakthrough histories with a standard IX resin; multi-component breakthrough histories with PLE; arsenate sorption: isotherms for PLE and 2 standard resins; efficient regeneration: As(V) elution history during regeneration; direct reuse of brine for multiple regeneration cycles; brine treatment and reuse; major composition of a spent regeneration brine (SRB); removal of As from SRB using FeCl₃; effect of pH on arsenate removal; effect of calcium addition on As removal; treated brine reuse; effect of Fe addition on waste residual stability; effect of Ca addition on waste residual stability; and, conclusions.