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The Los Angeles Department of Water and Power (LADWP) conducted a 12-month field study to evaluate the impact of chloramines in an open finished water reservoir. Free chlorine is currently used in the LADWP's open finished water reservoirs as the primary means of controlling algae growth with occasional use of copper sulfate. However, the proposed Microbial/Disinfection Byproducts (M/DBP) Rules will make it difficult for the LADWP to continue using free chlorine. The study evaluated the ability of chloramines to control algae growth in the reservoir. Algae concentration was low during the majority of the field study when a chloramine residual was present in the reservoir. However, two significant algae blooms occurred during the field study. The study also evaluated the chemical feed and mixing of chlorine and ammonia in the reservoir to form chloramine. A chlorine-to-ammonia (as N) feed ratio of 7.5 to 1 was successful in maintaining a chloramine residual of 2.5 mg/L with a 5 to 1 ratio of chlorine-to-ammonia. Includes 2 references, figures.

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Edition: Vol. - No. Published: 11/01/2002 Number of Pages: 13File Size: 1 file , 280 KB