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 issues and created problems for the city in complying with environmental regulation.
The existing system required frequent testing due to its high potential for unacceptable contaminant levels and environmental violations. The city accepted bids from three companies for an ultraviolet disinfection solution. Before making a final decision, facility managers toured an Infilco Degremont installation to observe an operating system for ease of use. Xenia chose Infilco Degremont’s Aquaray 40 High Output Vertical Lamp System, began construction in November 2003, and brought the new systems online in April 2004.