英文摘要 |
Taking a hot spring bath is an important leisure and entertainment in Taiwan. For resource conservation of hot spring, hot springs circulation and recycling need to be done with sterilization.The aim of this study is to explore the sterilization effect of both different photo-irradiation (UVA, UVC, solar irradiation, fluorescent lamp and darkroom) and dosing with odorless and non-toxic photocatalyst on E coli. (ETEC O4) in the mud hot spring of Guanziling under batch tests.Results show that the sterilization of E coli. (ETEC O4) in the mud hot spring of sodium bicarbonate chloride type was affected by intensity of photo-irradiation, photo-irradiation time, doage of titanium oxide. Results show that there was no disinfection effect on ETEC O4 under fluorescent lamp and darkroom conditions, and more E coli. found after longer reaction time. However, there were different effects on ETEC O4 under UVA and UVC, and better effects accompanying with duration time.Results also reveal that the effect of UVA photocatalysis was the best by dosing with 0.12 g/L titanium oxide, however, more than this dosage, the more dosage led to the worse sterilization effect. The effect of UVC photocatalysis was the best by dosing with 0.2 g/L titanium oxide.The disinfection effects on centrifugal hot spring better than without centrifugation might be caused by muds, which scattering possibly the penetrating of light, leading to worse effects on the disinfection of ETEC O4. |