Air disinfection with ultraviolet germicidal lamp in food places
Food places use ultraviolet germicidal lamps for Air Disinfection. Food processing places refer to food production and processing workshops, especially those that process directly imported food.
The hygienic quality of air and microorganisms in these processing places are the main reasons for food pollution and the decline of qualified rate.
We use ultraviolet disinfection and fumigation to disinfect the air in these places. (I)
The ultraviolet sterilization lamp currently used for ultraviolet sterilization is 253. Short wave ultraviolet at 7nm wavelength.
Ultraviolet light is a kind of low-energy electromagnetic radiation, and the irradiation energy can produce excitation effect.
Ultraviolet radiation sterilization causes chemical changes of nucleic acid, protoplasmic protein and enzyme in microbial cells to die.
Ultraviolet rays have a broad spectrum of bactericidal effect and can kill a variety of microorganisms including bacteria, Mycobacterium tuberculosis, spores and fungi.
Ultraviolet sterilization must choose the appropriate wavelength and need to have enough sterilization time, ultraviolet light penetration ability is poor, so it must be directly irradiated to the surface of microorganisms or objects to play a sterilization role.
Since ultraviolet rays can pass through clear and transparent water, they can be used for disinfection of production water. In addition, the sterilization effect of ultraviolet rays is affected by temperature (Suitable for 20-40 degrees Celsius), Humidity (60%)The following, suspended matter, organic matter, etc.
Ultraviolet rays are harmful to the human body, and such devices are only suitable for use without anyone.
Ultraviolet rays have special significance in sterilizing the surface of objects. For example, the surfaces of countertops, containers, paper and clothes that must be disinfected in food processing places can be sterilized by ultraviolet rays.
However, the ultraviolet ray penetration performance is poor, which can only kill the microorganisms that can be irradiated, and has no bactericidal effect on the irradiated parts.
When disinfection is carried out on the surface of tools and objects, dirt must be washed and removed, otherwise the sterilization effect will be reduced.
The installation of ultraviolet lamp should be about away from the disinfected object, and the effective disinfection area should be 1. 5 m-, The time is 30 minutes. (II)
Fumigation is to use disinfectant gas or smoke to fumigate in a closed space to achieve the purpose of disinfection. The method can be used for indoor air disinfection (Polluted air)It can also be used to treat contaminated surfaces.
Fumigation should be carried out regularly in food production and business premises to ensure the freshness of production sites and air. Peracetic acid fumigation, Peracetic acid (Peracetic acid)It is a highly effective sterilizing agent.
It is colorless and transparent liquid with pungent smell and volatile.
The boiling point is 110 degrees Celsius, which is corrosive and has bleaching effect.
Peracetic acid fumigation is suitable for contaminated surface treatment in sealed rooms.
The commonly used peracetic acid is 20% solution, the use environment is suitable at 20 degrees Celsius, and the relative humidity is 70-
90%, the dosage is 1G/M3 of Peracetic acid, and the fumigation time is 60-90 minutes. After reaching the specified time, ventilate and exhaust.