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The Monitoring of Water Quality in the Orange County Groundwater Basin Replenished by MF/RO/AOP Treated Secondary Effluent

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In 1933 the Orange County Water District (OCWD) was formed in Fountain Valley, California to maintain the quality and quantity of Orange County's groundwater basin. Orange County's groundwater basin (the Basin) currently provides potable water for over 2.5 million residents of North and Central Orange County. The Basin's primary water supply is obtained from the Santa Ana River, which is recharged into the Basin. Supplemental sources are imported from the Colorado River and State Water Project via the Metropolitan Water District (MWD). To address the issue of seawater intrusion, in 1976 OCWD began recycling Orange County Sanitation District (OCSD) wastewater at a facility known as Water Factory 21. Product water from this facility was injected along the Talbert Gap via a series of injection wells to form a hydraulic barrier. This barrier was used to block the migration of seawater into the main groundwater aquifer. In 2008 OCWD completed the Groundwater Replenishment System (GWRS) project to replace the Water Factory 21 facility which had reached the end of its useful like and was undersized for current seawater intrusion barrier needs. This project included a 70 million gallon per day (mgd) Advanced Water Purification Facility (AWPF) that uses microfiltration (MF), reverse osmosis (RO), and ultraviolet light (UV) with hydrogen peroxide to purify secondary effluent for use in an existing seawater intrusion barrier and for aquifer replenishment. Due to the use of reclaimed water in an indirect potable reuse scheme, OCWD has an extensive groundwater monitoring program. This paper will explore the nature of the AWPF treatment capability and the associated groundwater monitoring program used to support the GWRS project.
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Keywords: Advanced Oxidation; Aquifer; Groundwater; Microfiltration; Reverse Osmosis; Ultraviolet Light

Document Type: Research Article

Publication date: 2011-01-01

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