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Green Transformation of Circulating Cooling Water Treatment | O₃ + UV

I. Combined Effects and Advantages

        ·Ultraviolet light (especially 254nm wavelength) directly destroys the nucleic acid structure of microorganisms, inactivating them.

        ·Combined use can address the sterilization blind spots of ozone and UV, making them more effective against stubborn microorganisms such as Legionella, E. coli, and algae spores.

        ·Compared to traditional chemical agents (such as chlorine, chlorophenols, and quaternary ammonium salts), ozone and UV leave no chemical residue, no risk of secondary pollution or corrosion, and no resistance.

        ·UV light stimulates ozone photolysis, accelerating the generation of more active free radicals (·OH), forming advanced oxidation processes (AOPs), enhancing the oxidation capacity of recalcitrant organic matter and the inactivation of resistant microorganisms.

        ·Ozone effectively prevents scaling and corrosion by oxidizing organic matter in water and corrosion products on metal surfaces.

        ·UV light decomposes ozone residue, reducing the risk of ozone corrosion.

II. Application Cases and Results

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        Typical Ozone + UV Combined Treatment Process Flowchart for Circulating Cooling Water

        Ozone-containing water can be injected into the indirect cooling system or cooling tower sump using a single or multiple-point injection method. The medium-pressure UV device should be installed before the heat exchanger. During operation, the ozone concentration in the circulating cooling water should be monitored to maintain control levels.

        · Case Study at a Power Plant: After combined treatment, the total microbial count decreased from 10⁵ CFU/mL to <10² CFU/mL, biofilm thickness was reduced by 90%, and annual maintenance costs were reduced by 35%.

        · Industrial Circulating Water System: After ozone-UV treatment, the corrosion rate of the heat exchanger decreased by 50%, the amount of scale inhibitors used was reduced by 40%, and Legionella bacteria were completely eliminated.

III. Summary

Combined Ozone and UV technology significantly improves bactericidal and algaecidal efficacy, delays scaling, and reduces the use of chemical agents. In the future, it can be combined with intelligent control (such as AI-powered intelligent adjustment of ozone/UV dosage) to further optimize energy efficiency and promote the development of green and environmentally friendly water treatment technologies.

IV. ONYX Products

 

ONYX-Clear系列中压紫外消毒设备：

→采用管道式结构，法兰连接，占地面积小；

→24小时连续稳定运行，紫外线的泄漏量为0，安全性高；

→耐臭氧氧化过流部件；

→自带在线机械清洗，防止套管结垢；

→UV剂量监控、便于维护等优势。



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ModuOzone系列臭氧发生器

◇ Modular design, high integration;

◇ Flexible maintenance: Only a few spare modules are required, and replacements can be made without downtime;

◇ Plate-type discharge technology, high ozone concentration, and greater energy efficiency;

◇ Stable and durable, with a special ceramic treatment for corrosion resistance and long life.



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V. About ONYX

Beijing ONYX Environmental Technology Co., Ltd. is an environmental technology company specializing in providing water environment treatment equipment and solutions. Headquartered in Beijing and with a 30,000-square-meter production facility in Tianjin, the company is a national high-tech enterprise.


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