Disinfecting raw water for the California Aqueduct
The East Branch of the California Aqueduct is one of the most challenging sources of raw surface-water in the state. But, working with the Antelope Valley - East Kern Water Agency (AVEK), we helped evaluate options for disinfection-by-product control and the design of associated improvements at their four surface-water treatment plants: Quartz Hill (65 MGD), Rosamond (14 MGD), Eastside (10MGD), and Acton (4MGD).
Following the design, we were retained to manage construction of the projects under a construction management at-risk agreement. On top of general process improvements, the Quartz Hill plant was expanded to 90MGD.
Though the existing Quartz Hill filters were up to the change, the new capacity called for an update to the clarifiers. We designed modifications to the existing system including plate settlers, a new flocculation stage, a new sludge collection system, new rapid mix, and an expansion to chemical storage for aluminum sulfate and sodium hydroxide. Algae control—a major issue on East Branch water—was provided by fully enclosing the flocculation-sedimentation basins in a pre-engineered metal building.
With these improvements as well as the Quartz Hill expansion, AVEK’s four surface-water treatment plants were better equipped to pull water from the East Branch.
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