Abstract: The leaking process materials do great harm to the operation of circulating cooling water. The influence of leakage materials on the quality of the circulating cooling water and the reproduction of microorganisms was studied by simulating the condition of leakage material in the laboratory. The scheme of circulating cooling water treatment including leakage material detection, corrosion, scaling and microbial control was established. The results of continuous operation in a refinery for 30 months showed that the average corrosion rate for carbon steel test tube was 0.0186 mm/a, the average adhesion rate was 7.85 mg/(cm²/month), the average total number of heterotrophic bacteria was 4.85×10⁴mL^-1, and the average quantity of the slime was 1.01 mL/m³. The effect of circulating water treatment meets the requirements of safe and stable operation of the production plant.

Key words: leakage material, microorganism, corrosion, scaling