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City of
Tempe (Ariz.) Installs On-Site Sodium Hypochlorite Generating Systems
at Two Water Plants
November 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 on-site
sodium hypochlorite generation. The facilities, which were commissioned
in October, are each equipped with a duty and standby ClorTec on-site
sodium hypochlorite generating system, manufactured by Severn Trent
Services. On-site 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 gal. 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 gal. Severn Trent Services
provided temporary on-site 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 on-site 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.
Source: Severn Trent Services
November 11, 2005 |