Cooling towers are very common in industrial complexes and commercial buildings. The one thing common is that they use a lot of water. Water conservation requires that water to be recirculated. And that recirculated water needs to be treated to ensure that it does not corrode or scale the cooling elements. Additionally there are possibilities of organic growth within the water which requires treatment with biocides.
Corrosion Inhibitors – These are injected in the recirculated water to prevent corrosive damage to the components.
Scale Inhibitors – Scaling can be more damaging than corrosion sometimes as it drastically reduces the heat transfer. Anti-scalants are injected to prevent scaling in the pipes and tubes.
Biocides – There are two options here Non-Oxidizing Biocides and Oxidizing Biocides. The Non-Oxidizing biocides are dosed once or twice a week and they typically require and contact time of 4 hours. Oxidizing Biocides such as Chlorine and Bromine are used depending upon the pH of the water. Bromine is effective for pH up to 9 and Chlorine is good for lower pH around 6 or 7. Their level are usually measured using Redox (Oxidation Reduction Potential – ORP).