Technical Assessment of Water Reuse in Consideration of Emerging Pollutants
By Christopher Stacklin, P.E., and Jerry Evangelista, P.E.
The Groundwater Replenishment (GWR) System is heavily integrated with Orange County Sanitation Districtﾒs (OCSD) Reclamation Plant No. 1, which converts about 91 million gallons per day (mgd) of raw sewage to secondary treated effluent. Secondary treated effluent from OCSD is converted to drinkable water using state-of-the-art technology, including microfiltration (MF), reverse osmosis (RO), and advanced oxidation processes. To ensure that the GWR System product water is both safe, and of the highest quality, OCSDﾒs Source Control Division has developed an expanded source control strategy. Because of the vast number of emerging pollutants, a systematic method for prioritizing pollutants of concern for the purpose of source control was established. This is derived using a technical risk assessment methodology that looks at the potential impact of both conventional and emerging pollutants on the treatment systems. The technical risk assessment methodology for proactive expanded source control will be described herein. The methodology will be applied to the GWR System using analytical data and flows measured from the integrated facilities.
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