The related factors affecting the effects of ultraviolet radiation sterilization

by:Tepro     2020-04-23
Light intensity affected by voltage, temperature, irradiation and irradiation Angle, at the same time also pay attention to the tubes and service life. Experiments show that the voltage drop in 10 V 15 ~ 20 Lw drop in intensity of ultraviolet lamp. 2 cm, voltage under 190 V, the lamp can't work; Under the condition of voltage 220 V, room temperature within the range of 0 ~ 40 ℃, ultraviolet radiation intensity rise with increased at room temperature. Bulb, for example, when the temperature dropped from 27 ℃ to 4 ℃, output fell by 60% ~ 80%. The voltage is 190 ~ 240 V at room temperature for 16 ~ 35 ℃, ultraviolet radiation intensity and voltage, a linear relationship between Y = - at room temperature 325. 12 + 2. 014 X1+ 0. 72 X24,5。 Ultraviolet irradiation intensity and distance relationship is: E = 97. 72. What is the range of ultraviolet irradiation is 0. 7 ~ 2. 4m。 In vertical lateral on both ends of the ultraviolet lamp, with the increase of Angle uv intensity attenuation, near the center line of 0 on the outside of ultraviolet light. Therefore, ultraviolet disinfection, will use the lamp and a right Angle to offset each other more dark zone 6, 7. The principle of the ultraviolet germicidal lamp microbial types of various microbes on uv resistant. Fungal spores to strongest ultraviolet resistant, bacterial spores times, the worst is microbial reproduction size. General bacterial spores from its propagule tolerance strong 2 ~ 7 times. And between different strains of the same kind of the same species of different cultures and resistance to ultraviolet ray also have differences between different generations. Ultraviolet germicidal effect factors of the number of microorganisms, the suspended carrier and organic experiment dye bacterium quantity, the more the light uv dose. Bacteria attached to dust suspended in the air than in microbial aerosol in the resistance is strong, because ultraviolet penetration is very poor, can absorb uv light sterilizer rate, and the air dust motes when the air contains 800 ~ 900. 3 cm, sterilization efficiency can be reduced by 20% ~ 30%; Peptone, eggs, milk, blood, serum, etc all can enhance the existence of microbial resistance to ultraviolet radiation, because the DNA or dimethyl adding organic solvent can make the base thymine solution to accumulation, W acker and other organic solvent was studied influence on forming thymine dimer, found that the greater the nonpolar, the smaller the polymerization process. The influence of the temperature of most microorganisms ( Except micrococcus genera) At low temperature is very sensitive to uv radiation, because in this condition, the amount of thymine dimer decreased significantly, the accumulation of thymine light product will affect the microorganism repair; And temperature changes also affect the intensity of the ultraviolet. Temperature too high or too low will affect the disinfection effect, the average temperature in 20 ~ 40 ℃ advisable 7, also some people think that with 10 ~ 25 ℃ advisable. The influence of humidity humidity effects on uv sterilization, there is no consensus. Relative humidity above 60% ~ 70%, killing rate of microbes fell sharply, and the optimum was 40% ~ 60%, more than 80% or the activation function. Relative humidity increased from 33% to 56%, the sterilization efficiency can be reduced to the original one. 3. Others think that the influence of humidity on sterilization rate may be embodied in three aspects: (1) due to the high relative humidity, make particles in the air increases, when the sample is easy to capture, lower the sterilization effect is on the surface. (2) particles increases the radiation to penetrate cells reduced, thus killing effect reduced. (3) the relative humidity of 60% ~ 70%, the air bacteria in the water for 30 g. According to this quantity 100 g bacteria, the critical moisture content. Ultraviolet radiation energy transfer can destroy bacteria macromolecule conjugated relationships, this effect is easy to occur in critical moisture content and water loss of bacteria, so the condition of high humidity uv sterilization efficiency is low. Inositol and some compounds of microbial aerosol protection because they lose the combined water instead of the bacteria.
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