AWWA ACE99316

AWWA ACE99316 The Use of an Ultrasonic Transit-Time Flow Meter to Measure Filtered Water Flow in a Challenging Location During Major Construction
Conference Proceeding by American Water Works Association, 01/01/1999

Lesov, Jacob; Martin, Peter B.; Voigt, Karl H.

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This paper describes the installation and operation of a plant effluent flow meter at the Contra Costa Water District's (CCWD) 75 mgd Bollman Water Treatment Plant. It provides accurate flow-pacing of the post-filtration chemicals. One of the benefits of the new DCS system was that it would enable all the plant chemicals to be flow-paced, but many of the chemicals, i.e. sodium hypochlorite, ammonia, caustic soda and hydrofluosilicic acid, are fed after the filters. The plant influent venturi is appropriate for flow-pacing chemicals, such as coagulants and pre-oxidant, that are fed at the front-end of the plant. The installation of a plant effluent flow meter was considered to be essential, particularly for accurate control of disinfection chemicals, such as sodium hypochlorite and ammonia.