The chlorine disinfection method has been used for sewage treatment. However, it has begun to be regarded as detrimental due to the harmful chemical effects on marine life and the problem of sub-products (trihalomethane, etc.). Recently, the use of ultraviolet (UV) radiation to directly work on DNA has been attracting attention as a disinfection method. Key points in the development of such a system are a high-intensity UV light source and a disinfection system that realizes colon bacillus removal. The use of HF-frequency power circuit technology has made an input power of 500 W possible, realizing a high-intensity and high-power UV light source. Optimization of the wafer current path in the sewage effluent disinfection system has realized a colon bacillus removal rate of 99.9 percent.
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