CDM News - May 2008 - (Page 1) Cover The Next Frontier of Water Reclamation When Orange County, California, needed a new water treatment plant to keep up with demands prompted by population increases, area droughts, and environmental concerns, they turned to an innovative solution. Orange County Water District (OCWD) hired CDM to design the cutting-edge groundwater replenishment (GWR) system— the largest purification project in the world dedicated to producing potable water from treated wastewater. A model of sustainability, the pioneering system removes bacteria, emerging contaminants, chemicals, and viruses from highly treated effluent through microfiltration (MF), reverse osmosis (RO), and ultraviolet light (UV). Following treatment, the purified water is injected into a seawater barrier to prevent saltwater intrusion or percolated into groundwater basins before becoming drinking water for about 500,000 people.
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