Situation In 2001, the City of Xenia, Ohio, budgeted funds in its capital program to upgrade the two wastewater treatment plants serving the city’s population of 23,000. One plant, built in 1958, treated four million gallons daily; the other, built in 1970, processed 3.7 million gallons a day. The city was seeking an alternative to the plants’ chlorine gas disinfection technology. Chlorine gas as a disinfection solution had unacceptable safety i

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