Original title: Pipeline UV sterilizer and common methods of sterilization :
Xi'an Connor Environmental Technology Abstracts: 1. Pipeline UV sterilizer
Scope of application : for indoor air, surface of objects and disinfection of water and other liquids.
Pipeline UV sterilizer lamp and ducted UV sterilizer
The pipeline type UV used for disinfection is C- wave duct type ultraviolet light, its wavelength range is 200 - 275nm , and the strong band of sterilization effect is 250 - 270nm . The pipeline type ultraviolet light source for disinfection must be able to produce the radiation value up to the national standard. Pipeline UV lamp.
For the preparation of ducted UV sterilizer lamps, graded quartz glass tubes should be used in order to obtain satisfactory pipeline UV irradiation intensity.
The ducted UV sterilizer lamp can be equipped with a reflector made of a material with a high coefficient of reflection of the ductal ultraviolet light, such as a polished aluminum plate.
Pipeline type UV lamps required for disinfection at a voltage of 220V , an ambient relative humidity of 60 %, and a temperature of 20 °C, the radiation of 253.7nm pipeline UV intensity shall not be less than 70uW/cm2 (Ordinary 30W straight pipe type UV lamp Measured at a distance of 1 m from the tube , the special duct type UV lamp is measured at the distance of use, and the pipeline type UV intensity meter used must be calibrated.)
The radiation intensity of the pipeline type UV lamp is gradually reduced during use, so the intensity of the disinfection pipeline type ultraviolet light should be measured frequently, and once it falls below the required strength; it should be replaced in time.
The service life of the ducted UV sterilizer lamp, that is, the lamp whose intensity is reduced to 70uW/cm2 (power ≥ 30w) , or reduced to 70% of the original lamp intensity (power < 30w = time, should Not less than 1000h .
At present, the pipeline type UV sterilizer lamps used in China have the following types:
(1) Ordinary straight tube hot cathode low-pressure mercury pipeline type UV sterilizer lamp: The lamp tube is made of quartz glass or other glass with high transmittance of pipeline type, and the power is 40W , 30W , 20W , 15w and so on. The new lamp is required to radiate the intensity of 253.7nm pipeline type ultraviolet light ( measured at a distance of 1 meter without a reflector): power > 30W lamp, ≥ 90uW/cm ; power > 20W lamp, ≥ 60uW/cm2 ; power 150W lamp , ≥ 20uW/cm2 . Since this lamp emits a portion of 184 while radiating 253.7 nm ducted ultraviolet light . 9nm ducted UV. Therefore, ozone can be generated.
( 2 ) High-intensity pipeline type UV sterilizer lamp: The intensity of the required radiation of 253.7nm ducted ultraviolet light ( measured at a distance of 1 meter) is: power 30W lamp, > 180uW / cm2 ; 11w lamp, > 30 uW / cm2 .
( 3 ) Low-ozone pipeline type UV sterilizer lamp: It is also a hot cathode low-pressure mercury lamp, which can be straight tube type or H type; due to the special process and lamp material, ozone production is very low, requiring ozone production < 1mg/ h .
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Pipeline UV sterilizer:
(1) Pipeline type UV air sterilizer: It is made of low ozone pipeline type ultraviolet germicidal lamp and can be used for indoor air disinfection under human conditions.
(2) Pipeline type UV surface sterilizer: It is made of low-ozone high-strength pipeline type ultraviolet germicidal lamp, so that it can achieve satisfactory disinfection effect in an instant.
(3) Pipeline type UV sterilizer box: It is made of high-ozone high-strength pipeline type ultraviolet germicidal lamp. On the one hand, it uses the synergistic bactericidal effect of pipeline type ultraviolet ray and ozone, on the other hand, it uses ozone to carry out the part which is not irradiated by pipeline type ultraviolet ray. disinfection.
Scope and conditions:
Pipeline UV can kill various microorganisms, including bacterial propagules, spores, mycobacteria, viruses, fungi, rickettsia and mycoplasma. Any surface contaminated by the above microorganisms, water and air can be disinfected by pipeline UV. Device.
The pipeline type ultraviolet radiation has low energy and weak penetration, and can only kill microorganisms directly irradiated. Therefore, the disinfection site must be fully exposed to the pipeline type ultraviolet rays during disinfection.
When using a ducted UV sterilizer for rough surfaces such as paper or fabric, it is necessary to extend the irradiation time appropriately and both sides should be irradiated.
The suitable temperature range of the duct type UV sterilizer is 20 - 40 °C. If the temperature is too high or too low, the disinfection effect will be affected. The disinfection time can be extended appropriately. When used for air disinfection, the relative humidity of the disinfection environment is lower than 80 %. Otherwise, the irradiation time should be extended appropriately.
When using pipelined ultraviolet light to kill microorganisms protected by organic matter, the dose should be increased. Suspended particles in air and water can also affect disinfection.
Instructions
Disinfect the surface of the item
( 1 ) Irradiation method: Zui is good to use a portable pipeline type UV sterilizer for close-range moving illumination, and can also adopt ultraviolet light suspension illumination. Small items can be placed in a ducted UV sterilizer.
( 2 ) Irradiation dose and time: Different types of microorganisms have different sensitivity to pipeline ultraviolet rays. When using a pipeline type UV sterilizer, the irradiation dose must be used to achieve the irradiation dose required to kill the target microorganism. When killing the general bacterial propagule, the irradiation dose should reach 10000 u Ws / cm2 ; when killing the bacterial spore, it should reach 100000 u Ws / cm2 ; the resistance of the virus to the ductal ultraviolet light is between the bacterial propagule and the spore; Fungal grips are more resistant than bacterial spores and sometimes need to be irradiated to 600000 u Ws / cm2 ; when the target microorganism for disinfection is unknown, the dose should not be less than 100000 u Ws / cm2 . The irradiation dose is the product of the intensity of the irradiation of the ducted ultraviolet lamp used at the surface of the irradiated article and the irradiation time. Therefore, according to the irradiation intensity of the ducted ultraviolet light source, the time required for irradiation can be calculated. For example, use a ducted UV surface sterilizer with an irradiation intensity of 70 uW / cm2 to illuminate the surface of the object at close range; the selected irradiation dose is 100000 u Ws / cm2 ; the time required for irradiation is: 100000 u Ws / cm2 ÷ 70 u W / cm2 = 24 minutes.
  Disinfection of indoor air:
(1) Indirect irradiation: The preferred high intensity air duct UV sterilizer, disinfection only reliable, but also can be used when the indoor activity was generally start to achieve disinfection sterilization 30min qualified
( 2 ) Direct irradiation method: In the indoor unmanned condition, pipeline type ultraviolet lamp suspension or mobile direct irradiation can be adopted. When using an indoor suspension type UV sterilizer, the number of indoor installation duct type UV sterilizer lamps ( 30W duct type UV lamps, strength at 1.0 m > 70 uW / cm2 ) is not less than 1 per cubic meter. . 5W irradiation time is not less than 30min .
For the disinfection of water and other liquids, water or external water irradiation may be used. When using the water internal irradiation method, the ultraviolet light source shall be equipped with a quartz glass protective cover. Regardless of the method, the thickness of the water layer shall be less than 2 cm . The intensity of the UV source determines the water flow rate. After disinfection, the water must meet the national standards.
Precautions:
( 1 ) During the use, the surface of the pipeline type UV lamp should be kept clean. Generally, it should be wiped once every two weeks with an alcohol cotton ball. If there is dust or oil on the surface of the lamp, it should be wiped at any time.
( 2 ) When disinfecting indoor air with a ducted UV lamp. Keep the room clean and dry, reduce dust and water mist, temperature below 20 °C or above 40 °C, and extend the exposure time when the relative humidity is greater than 60 %.
( 3 ) When using the surface of the pipeline type UV sterilizer, the irradiated surface should be directly irradiated by the ducted ultraviolet ray, and sufficient irradiation dose should be achieved.
( 4 ) Do not expose the pipeline type ultraviolet light source to people to avoid damage.
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