Abstract ▼ AI-Helper

Chlorine-based chemical disinfection has been an appropriate process for bacteria and viruses. However, it is facing limitations in terms of control efficacy of protoza, such as Cryptosporidium and Giardia. In contrast, UV disinfection is an effective alternative for the control of protozoa that is ...

Chlorine-based chemical disinfection has been an appropriate process for bacteria and viruses. However, it is facing limitations in terms of control efficacy of protoza, such as Cryptosporidium and Giardia. In contrast, UV disinfection is an effective alternative for the control of protozoa that is highly resistant to chlorine disinfection. In this study, 4 UV reactors (each with a capacity of 2,000 ㎥/day) were evaluated for their performance efficiency over a one year period. As a result of the study, a pulsed UV disinfection lamp was replaced within 20 days and a low ultraviolet dose irradiated with high power consumption. The other three UV disinfection reactors achieved satisfactory results with the designed UV dose of 40 mJ/㎠ for more then 360 days. According to the results of the initial stabilization time on the UV dose assessment, the MP(medium pressure) reactor required a longer warm-up time than that of the low pressure reactor. All 4 types of reactors showed that the UV dose could be stabilized within 2 minutes after the start-up of a reactor. Most of the UV reactors showed a high correlation efficiency between UV intensity and dose. However, the reactor made by company D(Korea) installed the UV sensor in the reactor where it can not represent the UV intensity of the reactor. As a result, the UV intensity had a low correlation between UV intensity and UV dose when the lamp output changes due to lamp power settings, lamp aging, lamp sleeve aging, and lamp sleeve fouling and so on.