New disinfection method 222nm UVC light for hospital hotel
Disinfectants are a more traditional disinfection method, with low cost and weak disinfection effect. In addition, the volatilization and degradation of disinfectants are harmful to the human body and cannot be used for a long time.
The principle of ultraviolet disinfection is to destroy the genetic material DNA or RNA of bacteria and viruses, so that bacteria and viruses cannot reproduce, the sterilization effect is complete, and almost all bacteria and viruses can be killed. The ultraviolet light sources used for sterilization and disinfection are mainly traditional mercury lamps,now we have 222nm uvc lamps option.
The subway station is a city. At present, the flow of people is dense and the air flow is weak. In the face of the current situation, it is urgent to disinfect regularly and provide a safe public place to prevent the air from spreading. In addition, these areas are not convenient for spraying with liquid medicine; , enterprises resume work, the flow of people in the subway continues to increase, the use of traditional ultraviolet lamps is high risk, management is difficult, and supervision is difficult; especially, when the current epidemic has not been effectively contained, how to disinfect subway stations has become a problem. It is the top priority of all units to implement the government's epidemic control requirements.
For a long time, ultraviolet disinfection has been favored by professional disinfection due to its significant advantages such as high efficiency, broad spectrum, thoroughness, no drug resistance and no secondary pollution. The defect of the accident led to the poor application and promotion of ultraviolet disinfection.
Based on the ubiquitous Internet of Things technology, the intelligent ultraviolet disinfection system proposed by e-disinfection can just overcome the shortcomings of traditional ultraviolet disinfection, give full play to the advantages of ultraviolet disinfection, and play an important role in the disinfection of subway stations." "Disinfection of surfaces
(1) Irradiation method: It is best to use a portable ultraviolet sterilizer for short-distance mobile irradiation, or a hanging ultraviolet lamp can be used for irradiation. Small items can be irradiated in a UV disinfection box.
(2) Irradiation dose and time: Different types of microorganisms have different sensitivities to ultraviolet rays. When disinfecting with ultraviolet rays, the irradiation dose must be used to achieve the irradiation dose required to kill the target microorganisms.
When killing general bacterial propagules, the irradiation dose should reach 10000uW.s/cm2; when killing bacterial spores, it should reach 100000uW.s/cm2;
The resistance of viruses to ultraviolet rays is between bacterial propagules and spores; the resistance of fungal spores is stronger than that of bacterial spores, and sometimes needs to be irradiated to 600000uW.s/cm2; when the target microorganisms for disinfection are unknown, the irradiation dose Should not be lower than 100000uW.s/cm2.
The irradiation dose is the product of the irradiation intensity and irradiation time of the UV lamp used at the surface of the irradiated article. Therefore, according to the irradiation intensity of the ultraviolet light source, the required irradiation time can be calculated. For example, use an ultraviolet surface sterilizer with an irradiation intensity of 70uW/cm2 to irradiate the surface of the article at close range; the selected irradiation dose is 100000uW.s/cm2; then the required irradiation time is:
100000uW.s/cm2÷70uW/cm2=24 minutes.
