The OCWD GWRS Advanced Water Purification Facility located in Fountain Valley, California, is a globally recognized potable reuse facility capable of producing up to 130 mgd of high-quality recycled water to support water demands of a population of approximately 2.5 million people. The GWRS employs a multi-barrier treatment process to purify a blend of secondary effluent provided by the Orange County Sanitation District (OC San) Plant 1 activated sludge systems and Plant 2 trickling filter systems. The multibarrier process includes microfiltration or ultrafiltration, RO, and ultraviolet-advanced oxidation process (UV-AOP) utilizing hydrogen peroxide and ultraviolet light. Partial decarbonation and lime addition are utilized after UV-AOP to reduce water corrosiveness. Finished purified water is used for groundwater recharge and to supply a seawater intrusion barrier. A process schematic of the treatment system is shown in Figure 1.
