The Cheyenne Board of Public Utilities (BOPU) operates the water and wastewater systems for the capital of Wyoming which has a population of more than 63,000. Located in the fast growing Front Range Urban Corridor, BOPU is challenged by growth, periodic water scarcity and aging infrastructure. During high demand, Cheyenne disinfects approximately 2 million gallons from well fields at an off‐site
location from the water treatment plant. This off‐site location used a calcium hypochlorite disinfection process that required frequent, recurring maintenance. To reduce costs, the BOPU investigated alternative methods for disinfection. BOPU staff eliminated chlorine gas and bulk commercial bleach (12% concentration) disinfection processes due to safety concerns and determined that an on‐site
sodium hypochlorite generation system (OSHG) as the best option for reducing maintenance. The BOPU ultimately selected the Microclor® OSHG system manufactured by Process Solutions, Inc. (PSI) as the system that met their needs by generating the disinfectant with only water, salt and electricity. The Microclor® OSHG system also allayed concerns of hydrogen accumulation because it is the only system
with vertical electrolytic cells that vent hydrogen passively away from the generation area.
Wenck Engineering was awarded the contract to design a new building to house the disinfection system. General contractor selection, and construction began in 2014 with commissioning shortly thereafter