AWWA MTC64570

This slide presentation outlines a project on innovative post treatment stabilization solutions using reverse osmosis (RO). The project goals included: provide ability to adapt to changing raw water quality or availability; and, maintain post-treatment stabilization without a blend source. The project approach included: incorporating lessons learned about raw water quality deterioration, material selection, and maximize flexibility; forward thinking reliability in design, "Legacy Facility"; and, applied approach to post-treatment stabilization of the RO permeate. Permeate properties included: unappealing aesthetically; poorly buffered against pH changes; and, corrosive to infrastructure. Permeate Stabilization requirements included: addition of calcium; addition of carbonate alkalinity; and, pH adjustment. Post treatment stabilization fresh water blending included: fresh water blended as percent of permeate flow; utilizing native calcium carbonate hardness; ease of operations; and, cost effective. Includes 5 references, tables, figures.