A cooling system, at a large industrial facility, switches to chlorine dioxide from chlorine and reduces copper allow corrosion rates from 1.0+ to 0.1 mpy and improves biological control – cooling tower deck algae eliminated.
The cooling water was lime softened, clarified river water, meaning low alkalinity, high pH make up water. One of cooling water systems had an unidentified process contaminant. When chlorine gas was fed beyond 50 lbs./day, the acid (formed by the reaction of chlorine with water) would drive the pH down below 5.0. Coupons from an upset showed 110 mpy and 5+ on admiralty brass. The normal corrosion rates were <5 mpy on steel and 1.0 mpy on admiralty. In addition, chlorine caused a 40% reversion rate of the calcium carbonate scale inhibitor.
Chlorine dioxide addition was initiated to replace the chlorination program. Chlorine dioxide does not react with water like chlorine and chlorine does not penetrated biomass like chlorine dioxide.
What did the chlorine dioxide accomplish?
- Effective biological control
- Removal of algal matts on the CT distribution deck
- No effect on system pH
- Reduction of admiralty corrosion rates to 0.1 mpy
- Eliminating the reversion of the phosphonate scale inhibitor
In addition, the formation of the biorecalcitrant, halogenated organics is essentially eliminated.
Chlorine dioxide is the right solution for controlling biological fouling in cooling water systems and helps meet our environmental responsibility.
If you would like to learn more about how PureLine’s chlorine dioxide solutions can be used with your water treatment system, please contact PureLine using the form below.
With over 20 years of experience in the manufacture, generation, and application of chlorine dioxide solutions, PureLine specializes in designing and implementing chlorine dioxide treatment solutions utilizing our broad line of proven chlorine dioxide generators and chemical solutions to control and inhibit the growth of mold, mildew, and odor causing bacteria.