explaining the process and intent of ocwd ground water replenishment system
TRANSCRIPT
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GWRS - Groundwater Replenishment System
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GWRS - Overview● Current production
capacity of 70 mgd, enough water for 600,000 people
● Purifies already highly treated wastewater to near-distilled quality
● Provides additional peak wastewater flow disposal relief
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Major Benefits● Reduces economic and environmental
impact of droughts, $478/AF with subsidies
● Provides all necessary low-turbidity water for the Talbert Seawater Barrier
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History● Operational since January
2008
● Jointly funded by the Orange County Water District and the Orange County Sanitation District
● Largest issues were the lack of planning for diurnal flow and optimizing the decarbonation and lime stabilization process.
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Flow Diagram
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How it all works
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Pre-Purification● first treated at the Orange County
Sanitation District (OCSD)
● 200 million gallons of wastewater per day
● bar screens, grit chambers, trickling filters, activated sludge, clarifiers and disinfection processes
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● 0.2 micron in diameter
Step 1 Microfiltration
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Step 2reverse osmosis
RO process● disinfects and
destroys any trace organic compounds
● NDMA, 1-4 Dioxane
Step 3 UV & H202
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distribution35 million gallons → injected into seawater intrusion barrier
● Water Factory 21 (WF-21)● 23 wells along the coast
35 million gallons → pumped into Anaheim groundwater recharge basins
● 13 mile pipeline to Kraemer and Miller
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Future DevelopmentsPlanning to add an additional 30 mgd
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References
• R. Herndon and M. Markus, Orange County Water District, 18700 Ward Street, Fountain Valley, California 92708, Large‐Scale Aquifer Replenishment and Seawater Intrusion Control Using Recycled Water in Southern California.
• William Dunivin, Mehul Patel, and James H. Clark, Orange County Water District Black & Veatch Corresponding author e-mail: [email protected], Building on Lesson Learned for Expanding the Next Phase of the Groundwater Replenishment System
• GWRS Technical Brochure, http://www.gwrsystem.com/images/stories/AboutGWRS/GWRS%20Technical%20Brochure.pdf