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Detroit Water and Sewerage Department (DWSD) provides drinking water for nearly 4million people throughout Southeast Michigan. DWSD has five water treatment plants,which supply water to the City of Detroit and approximately 125 suburban communitiesin southeast Michigan. The stated treatment capacity for the combined five plants isapproximately 1.7 billion gallons per day.The Department has been faced with the upgrade of many critical components of thedrinking water treatment and delivery system, parts of which were constructed in the1920s through the 1950s. The Department has been committed to providing its watercustomers with the highest quality water and has made a concerted effort to stay wellahead of upcoming SDWA regulations. This effort has required DWSD to undertakeinitiatives that provide ongoing treatment studies, as well as major plant upgrades toensure that capacity can be reliably maintained. DWSD developed finished water qualitygoals that include removal and/or inactivation of Cryptosporidium, Giardia and Virus.Stringent turbidity goals aligned with the Partnership for Safe Water and a desire tocontrol periodic episodes of taste and odor causing compounds, including geosmin andMIB, are at the heart of treatment goals and plant upgrades. One of the significantchallenges has been the evaluation of the retrofit construction of new technologies suchas ultraviolet disinfection or ozone into the existing plants.This paper discusses the unique challenges of large olderplants and the solutions DWSD has developed. The two plants that are discussed includethe 540 mgd Springwells Water Plant and the 240 mgd Southwest Water Plant. Includes tables, figures.

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Edition: Vol. - No. Published: 06/15/2003 Number of Pages: 17File Size: 1 file , 740 KB