Ultraviolet helps City of Henderson exceed water disinfection goals

When the City of Henderson's Department of Utility Services wanted to upgrade its water disinfection system, it turned to ultraviolet (UV) disinfection.

Erlanger, Kentucky, April 30, 2004 -- When the City of Henderson's Department of Utility Services wanted to upgrade its water disinfection system, it turned to ultraviolet (UV) disinfection. Henderson, now the second largest city in Nevada, decided to upgrade and modernize its water treatment system to enhance water quality and meet increasing demand.

Following a public bid process conducted by the city, in conjunction with the Nevada State Health Division and engineering consultant CH2M Hill, Aquionics and Hanovia were chosen to supply a new state-of-the-art UV water disinfection system. Construction began in 2001 on one of the first large-scale UV potable water installations in the United States. Following several trials and a rigorous validation process, the system is now complete and in the final test phase for approval by the Nevada State Health Division.

Treating 15 million gallons per day (mgd), the UV disinfection plant consists of four medium pressure UV chambers, each with an independently validated capacity of 5 mgd. The system is completely automated with UV dose control, fail-safe features and reliable automatic cleaning for ease of maintenance. Provision has also been made for a fifth UV chamber should demand rise in the future. The water, which originates from Lake Mead, is coagulated with ferric chloride then flocculated and filtered before passing through the UV chambers prior to distribution.

The city's Technical Services Manager Mike Morine said, "We implemented this project to provide the best possible disinfection for our community. UV is a cost-effective way of achieving this, and it is expected to help us meet and exceed anticipated USEPA water quality regulations. Aquionics and Hanovia have worked diligently with Henderson, CH2M Hill, and the contractor to provide a system that exceeds our requirements and expectations."

The Henderson Department of Utility Services recently received a Gold Award for Competitive Achievement by the Association of Metropolitan Water Agencies (AMWA). "AMWA's Gold Award winners are among the best-operated water systems in the nation," said Diane VanDe Hei, Executive Director of AMWA. "Their performance reflects very positively on the industry, and the consumers and public officials they serve have good reason to be proud of their accomplishments."

More in Disinfection