Abstract: In this paper, based on the three factors of the power of the deep ultraviolet lamp, the working time of the ultraviolet lamp, and the distance between the ultraviolet lamp and the bacterial solution, four different combinations of working conditions of the deep ultraviolet lamp are set to study its effect on the sterilization rate of E. coli. The experimental results show: Within a certain range, the change of irradiation time is more sensitive to the sterilization rate of E. coli. The difference between the power of the UV lamp and the irradiation distance is not sensitive to the effect of E. coli sterilization rate. Based on the above results, the refrigerator sterilization zone was designed. The ultraviolet light irradiation intensity was greater than 5.5μW/cm², and the killing rate of Salmonella was greater than 99%.

Key words: Deep ultraviolet light, Sterilization, Disinfect