Ground Water Replenishment with Reclaimed Water in the City of Los Angeles |
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| Authors: | Ali A Karimi Jeremy A Redman Roberto F Ruiz |
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| Institution: | Ali A. Karimi;received his M.Sc. and Ph.D. degrees in civil and environmental engineering from the University of Southern California. He has been with the Los Angeles Department of Water and Power (DWP) (111 N. Hope St., Room 1348, Los Angeles, CA 90012) for 14 years in charge of developing water quality improvement projects. A registered civil engineer in California and Washington, and a diplomat of the American Academy of Environmental Engineers, Karimi's work has been published widely. Jeremy A. Redman;was a student engineer during the course of this study. He is currently a Ph.D. candidate at the Environmental Engineering Program of the University of California, Irvine. His current research focuses on the physicochemical factors affecting the movement of viruses in soil. Roberto F. Ruiz;is a civil engineer with DWP's Infrastructure Planning &Development. He holds a B.Sc. degree in civil engineering from the University of California-Berkeley and an MBA from Pepperdine University. He is a registered civil engineer in California. |
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| Abstract: | A two-year pilot study involving the recharge of a ground water basin with reclaimed water was completed in the city of Los Angeles. The city's Department of Water and Power is planning to initiate several ground water recharge projects using reclaimed water in the near future. One such project is the Headworks Recharge Project, the focus of this paper, Approximately 1 cfs of the Los Angeles (LA) River water comprised of 70% tertiary treated reclaimed water was recharged on a two-day wet and five-day dry cycle. The recharge water was then extracted from the basin approximately 1000 feet downgradient. Results showed greater than 4-log removal of coliform bacteria, up to 87% reduction in TOC, and compliance of the product water with federal and state drinking water standards. Model simulation showed after 15 years of recharging 3000 acre-feet per year of the LA River water and extracting about 10,000 acre-feet from the basin, the product water would contain from 5% to 15% reclaimed water. This is well below the maximum allowable limit of 20% stipulated by the California regulation. |
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