Severn Trent provides disinfection systems in Phoenix area

The city of Tempe, Ariz., recently replaced the gaseous chlorine disinfection systems at two water treatment facilities with onsite sodium hypochlorite generating systems from Severn Trent Services. The ClorTec systems allow the city to reduce disinfection by-product formation as well as the potential hazards and security risks to plant operators and the nearby communities associated with chlorine gas. Carollo Engineering oversaw engineering for the project and served as design engineer...

FORT WASHINGTON, PA, Nov. 11, 2005 -- The city of Tempe, Ariz., recently replaced the gaseous chlorine disinfection systems at its Johnny G. Martinez Water Treatment Facility (WTP) and South Tempe WTP with onsite sodium hypochlorite generation. The facilities, which were commissioned in October, are each equipped with a duty and standby ClorTec™ onsite sodium hypochlorite generating system, manufactured by Severn Trent Services. Onsite sodium hypochlorite disinfection allows the city to reduce disinfection by-product formation (DBPs) as well as the potential hazards and security risks to plant operators and the nearby communities associated with chlorine gas.

The Johnny G. Martinez WTP system produces 3,000 pounds per day (lb/day) of sodium hypochlorite at a 0.8% solution and has a total storage capacity of 42,000 gallons. The South Tempe WTP system produces 2,250 lb/day of sodium hypochlorite at a 0.8% solution and has a total storage capacity of 30,500 gallons. Severn Trent Services provided temporary onsite disinfection systems that were used for about a year while expanded facilities were constructed to house the new equipment.

According to Don Hawkes, water utilities manager for the city of Tempe, "Safety, security and long-term capacity were the highest priorities in making the switch from gaseous chlorine to onsite sodium hypochlorite generation. The support we received for the temporary systems while construction was in progress was outstanding, and the new sodium hypochlorite generating systems are operating flawlessly."

Carollo Engineering was responsible for oversight engineering for the project and served as the design engineer. M.G.C. Contractors was the general contractor.

Severn Trent Services (www.severntrentservices.com), based in Fort Washington, Pa., is a leading supplier of water and wastewater treatment solutions. The company's broad range of products and services is concentrated around disinfection, instrumentation, and filtration technologies, pipeline analysis, rehabilitation and repair services, contract operating services and state-of-the-art residential metering products and services. Its international management services business provides support in all aspects of water and wastewater utility operational development and business transformation. Severn Trent Services is a member of the Severn Trent Plc group of companies. An international environmental services leader, Severn Trent is a FTSE 100 company.

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