Chlorine dioxide (ClO2) is an oxidant and a highly efficient, broad-spectrum, and safe pesticide fungicide. Since the mid to late 1970s, ClO2 has been used overseas to manipulate microbial strains in circulating cooling water. The actual effects of improving the software of the circulating cooling water system, such as mud accumulation, automatic control system erosion, and automatic control system algae, are all very obvious. In the 1990s, ClO2 products gradually gained marketing promotion in circulating cooling water solutions in China, and now they have been widely used with excellent practical results. Nanjing University of Technology is one of China's early development and design companies for ClO2 products. Nanjing Institute of Technology Water Company leverages the technological capabilities of Nanjing Institute of Technology and integrates nearly a decade of industrial development practice activities to discuss the current situation and development trends of ClO2 application in industrial production circulating cooling water solutions.

1、 Disinfection characteristics of chlorine dioxide

The way to manipulate the growth and development of microbial strains in the cooling water system software is by adding biocides, commonly including reducing biocides such as liquid carbon dioxide, calcium hydroxide, chlorine dioxide, and non reducing biocides such as quaternary ammonium salts, chlorophenols, and organic chemical acrylamide. Hydrogen is widely used among them, but the alkaline natural environment can seriously reduce the actual killing effect of hydrogen. Chlorine and organic compounds in water are converted into carcinogens, and hydrogen machinery and equipment have safety hazards of corrosion and leakage, promoting the search for stronger alternative products. As a substitute product, ClO2 has the following characteristics:

a. ClO2 has broad-spectrum and high-efficiency sterilization ability, and secondly, sodium chlorate solution is 2.63 times that of hydrogen gas, and the actual sterilization effect is 5 times that of hydrogen gas.

b. ClO2 is basically not affected by pH value hazards, and the application of ClO2 for sterilization in alkaline solution plans has more advantages. In addition, ClO2 does not react with ammonia and hydroxyl chemicals and can maintain its killing ability. This characteristic makes ClO2 very suitable for cooling water solutions in synthetic ammonia process plants and chemical plants.

c. ClO2 not only kills microbial strains, but also dissolves the structure of residual cell membranes, allowing for reasonable manipulation of pathogens, algae, and mud, resulting in practical mud stripping effects and improved heat transfer efficiency.

d. The actual delay time of ClO2 sterilization effect is long, and long-term application is not easy to cause resistance to microbial strains. At the same time, as the temperature rises, its sterilization ability also improves.

2、 Application Cases of ClO2 in Industrial Production Circulating Cooling Water

a. The circulating water system software of a cyclohexanol plant in a petrochemical enterprise in Nanjing has a water volume of 7000 tons. In 1995, stable ClO2 from Nanjing University of Science and Technology was used to replace chlorine controlled bacteria and algae, with a 2% stable liquid of 20PPm (reasonable ClO20.4PPm) added every 3 days. The number of bacteria was controlled between 103-105/ml.

b. Two sets of circulating water system software for a certain petrochemical company's nylon plant, with a circulating water volume of 5500t/h, a water volume of 2600t, and a concentration rate of 3.0, were tested in a production experiment using stable ClO2 instead of chlorine. A one-time impact addition of 2% stable ClO2 250 kg was carried out, with a reasonable ClO2 concentration value of 0.3mg/L. The number of heterotrophic bacteria and drugs added after 24 hours was 1.13102/ml and 48 hours was 3.73102/ml.

c. A certain chemical plant's circulating water system software uses 2% stable ClO2, with a dosage of 20PPM, added every three days. It has been used for more than half a year, and the number of heterotrophic bacteria is generally controlled at 103/ml, resulting in microbial sludge; 1ml/m3, turbidity lower than 10mg/L. During cleaning and separation, 2% stable ClO2100mg/L was added and circulated for 24 hours. After analysis, the actual effect of water transformation was significant, with turbidity gradually increasing from 4mg/L to 47mg/L and total iron increasing from 0.4mg/L to 38mg/L.

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