Sterilization and Algae Control in a Large Industrial Circulating Cooling Water System

Challenge: During the hot summer months, the system experiences severe algae and bacterial growth, resulting in reduced heat exchange efficiency and equipment corrosion. Previously, non-oxidizing biocides were used, which were costly and prone to developing bioresistance.

Solution: Utilizing a "periodic surge dosing" approach, calcium hypochlorite solution was added to the circulating water twice weekly to temporarily raise the residual chlorine level to 0.8-1.0 mg/L, with daily low-dose maintenance.

Results:

Efficient Control: The strong oxidizing properties effectively removed biosludge and algae, restoring heat exchange efficiency.

Cost Reduction: As an oxidizing biocide, its cost is significantly lower than dedicated non-oxidizing biocides.

No Resistance: The physical killing mechanism ensures that microorganisms will not develop resistance.