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There are many methods applicable for sterilizing process,
such as heating sterilizing, chemical sterilizing and ozone
sterilizing, etc. Among these methods, the process applying
ultraviolet rays to sterilize becomes more outstanding because
of its effectiveness to all kinds of bacteria, small risk
of causing the objects to deteriorate, as well as the low
operating and maintenance costs.
Low-pressure mercury lamp irradiates the ultraviolet lights
of wavelength 254nm, which is almost in agreement with the
wavelength having the best sterilizing effect. The properties
of this wavelength are close to those of the optical absorption
spectrum existing in the microbe's DNA, so it is explained
that the mechanism of applying ultraviolet lights to sterilize
is due to the fact that ultraviolet lights destroy DNA.
■Ultraviolet lights have displayed their superpower in all kinds of sterilizing fields.
[ Producing and processing industries of food, liquor and drinking water ]
●Indoor sterilization
●Sterilization of containers, packaging materials and devices such as bottles, caps and conveyors, etc.
●Sterilization of the foods before package and those after package through transmission film
●Sterilization of the water used as the raw material used for brewing, food-processing and ice-making, etc.
●Sterilization of the washing water used to clean the containers and machines
●Sterilization of the drainage
●Sterilization and mold-proofing of the storage equipments
[ Medicines and cosmetics industry ]
●Sterilization of the raw materials
●Sterilization of water used as raw material
●Sterilization of containers, packaging materials and such as bottles, caps and conveyors, etc.
●Sterilization of washing water
●Sterilization inside the packing room
●Sterilization before entering the clean room
[ Electronic industry ]
●Photo-oxidation decomposition of minor organic substance in ultrapure water
●Sterilization before RO of the ultrapure water production line
●Sterilization of the clean room
●Oxidative decomposition of the organic substance in wastewater-recycling system
[ Agriculture & fisheries ]
●Sterilization of the thawing water
●Sterilization of the washing water used in fish-raising industry such as oyaster (shelled) farming and wakame faming, etc.
●Sterilization of the water for hatching salmon and other kinds of fish
●Sterilization of the drainage from fish farming
●Sterilization of solution in hydroponic farming
[ Hospital and research institution ]
●Sterilization of experimental water for various medical purposes such as sample dissolution, experiment and analysis etc.
●Sterilization of washing water in various medical uses such as the water used in the preoperative preparation, in treatment room and in medical-instrument cleaning, etc.
●Sterilization of the drainage for medical treatment and research
●Sterilization of medical carrier box
[ Food stores, restaurants, kitchens in hotels ]
●Sterilization for interior of storehouse
●Sterilization for interior of kitchen
●Sterilization for dresser
●Sterilization of washing water
[ Others ]
●Sterilization of drinking water in boats, trains and vending machines, etc.
●Sterilizing the sewage taking the place of chlorination
●Sterilization of drinking water in an emergency
●Sterilization and purification of pool water |
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■Demerits of other sterilization methods
[ Thermal sterilization ]
●It is not suitable for thermoresistant bacteria.
●It may cause the transformations on the sterilized object.
●The cost is high in energy.
●Bacteria are carried easily because of the existence of the cooling process
[ Chemical sterilization ]
●Secondary treatment is necessary because of the existence of the residual chemicals.
●There is the possibility of generating the resistant bacteria.
[ Ozone sterilization ]
●It is harmful to people's health.
●Too much time is spent because of the low density.
●Metal erosion is caused easily by oxidization.
●It is necessary to take a long time to sterilize the thermoresistant bacteria and fungus.
■Merits of ultraviolet sterilization
[ Merit 1 ] It is applicable for all kinds of bacteria.
[ Merit 2 ] The possibility of causing the bacteria to transform is very low.
[ Merit 3 ] Equipments are simplified and thus maintenance cost spent on them is low.
[ Merit 4 ] Due to the secondary treatment unnecessary, the sterilization process is simplified. Consequently, the operation time is shortened and the cost is reduced.
[ Merit 5 ] Sterilization can be performed under the normal temperature.
[ Merit 6 ] Resistant bacteria cannot be generated. |
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■Products of sterilization process
▼UV irradiation equipments (mercury lamp and metal halide lamp)
- UV application/Related products - |
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