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.
