Anaheim State-of-the-Art Water Treatment Plant?Six Years from Conception to Completion

Pai, Isaac; ,

Anaheim State-of-the-Art Water Treatment Plant?Six Years from Conception to Completion

by Isaac Pai,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water

Abstract:

After six years of intensive planning, budgeting, pilot testing, design, and construction, the City of Anaheim, California, has successfully completed the modifications to the 15 mgd Lenain Water Treatment Plant (LTP) in early 1996. A tribute to the careful planning, risk taking, communication, dedication and team work of the project members. This innovative project now enables the city to meet future regulatory requirements regardless of possible varying water sources. Anaheim's Public Utilities Department (PUD) serves nearly 300,000 people, with 70-75 percent of its water produced by wells. During normal operation, this plant supplies about 16 percent of the city's overall yearly water demand. Built in 1969, the plant's original treatment process was in-line filtration, including only a static mixer and filters. Although this process was effective for many years, it was not well suited to treat water with high turbidity. Because chlorine was the primary disinfectant, the production of disinfection by-products (DBPs) also was of concern. The plant used two automatic backwash Hardinge filters, a popular technology in the 1960s when the plant was constructed. However, because of the new Surface Water Treatment Rule (SWTR) requirements, Hardinge filters are no longer an approved technology (as per the California Department of Health Services-DHS) because of their shallow depth of sand (11 in.) and the lack of individual filter monitoring and filter-to-waste capability. The original plant was built to treat imported water purchased from the Metropolitan Water District of Southern California (MWD) which is currently comprised of Colorado River water (CRW). In the future, this source will be supplemented with supplies from the California State Water Project (SWP). Thus three likely future scenarios with varying water quality exist for raw water treatment at the plant: CRW, SWP, or blends of both. This paper will discuss the overall schedule, process evaluation study, design features and construction challenges.

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