World’s Largest Indirect Potable Reuse Facility Set To Expand

The Groundwater Replenishment System (GWRS), located in Orange County, California, USA, provides purified recycled water for aquifer recharge and for injection into area aquifers to prevent seawater intrusion.

The GWRS is a joint project between the Orange County Water District (OCWD) and the Orange County Sanitation District (OCSD). It is the largest indirect potable reuse project of its kind in the world and utilizes the most advanced water treatment technology available, including UV-oxidation with our TrojanUVPhox®.

The GWRS treats and reuses wastewater that, in the past, had been discharged to the ocean. The water is reused to provide protection against drought and as a means of achieving a sustainable water supply.

Initial Expansion Project

In early 2015 the District will begin operating the Initial Expansion of the GWRS. This $143 million project will expand water supplies by an additional 30 million gallons per day (MGD), bringing total treatment capacity to 100 MGD and number of TrojanUVPhox treatment trains to 13.

The TrojanUVPhox uses the UV advanced oxidation process (UV AOP) to reduce a range of contaminants, even difficult-to-treat 1,4-dioxane and NDMA. Vertically stackable and modular, the system allows for multiple chambers in series and the ability to expand without increasing footprint. It is available in multiple configurations with various numbers of lamps per chamber to handle virtually any flow rate.

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