Full Description

In order to supplement sources of water in Orange County, California, the Orange County WaterDistrict (OCWD) and the Orange County Sanitation District (OCSD) have developed theGroundwater Replenishment (GWR) System. This phased project will reclaim clarifiedsecondary effluent and produce water for a seawater intrusion barrier and forgroundwater recharge.The AWTF consists of three major treatment processes: microfiltration (MF); reverseosmosis (RO); and, an advanced oxidation process (AOP), which consists of ultraviolet(UV) light and hydrogen peroxide. Currently in the GWR System design, membranesoperate in conjunction with advanced oxidation processes to provide treatment ofwastewater. This multi-barrier approach produces water with quality higher than othersources available to the Orange County area. Due to increased awareness of new andemerging contaminants, OCWD and OCSD evaluated options to efficiently treat waterthat would meet all drinking water standards. Using a full-scale demonstration facility, ithas been proven that removal of these contaminants below regulated levels is possiblewith the advanced treatment processes of MF, RO, and AOP.Concern has recently focused on the fate of low molecular weight organics (LMWOs)and pharmaceuticals during advanced treatment. LMWOs and pharmaceuticals havebeen sampled throughout the GWR demonstration facility. Preliminary results havedemonstrated that RO followed by an advanced oxidation process (UV and hydrogenperoxide) is able to effectively remove these contaminants. The approach used atOCWD and OCSD to address these emerging contaminants is presented in this paper. Includes 12 references, tables, figures.

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Edition: Vol. - No. Published: 03/05/2003 Number of Pages: 13File Size: 1 file , 540 KB