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The Los Angeles Department of Water and Power (LADWP) is evaluating EnhancedCoagulation (EC) as a technology to address several treatment goals including arsenic,turbidity, and DBP precursor reduction at the 600-MGD Los Angeles Aqueduct Filtration Plant(LAAFP). Currently, the plant process consists of preozonation followed by high-rate directfiltration. The average arsenic concentration in the Los Angeles Aqueduct (LAA) is 25 g/L. Achemical addition system at Cottonwood, 180 miles upstream of LAAFP, is being used to shaveoff some of the arsenic peaks. This system may cease operation in the future so that all aspectsof treatment can be centralized and managed at LAAFP. The team of Metcalf clarification process.This paper focuses on the findings of bench- and pilot-scale testing of EC strategies evaluatedat LAAFP. It discusses the required ferric chloride dosages to meet the treatment goals atLAAFP, the impact of raw water blend on treatment performance, and the lessons learned inclarification and filtration processes at the bench and pilot scale. Includes tables, figures.

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Edition: Vol. - No. Published: 06/17/2005 Number of Pages: 17File Size: 1 file , 1.4 MB