RU2084189C1 - Method and apparatus for disinfecting animal products during defrostation - Google Patents

Abstract

FIELD: animal products sanitation. SUBSTANCE: method involves exposing animal products to ultraviolet radiation with intensity of 8-10 Wt/cub m and wave length of 250-260 nm for 1-2 hours through each 10-12 hours of defrostation process. Apparatus has chamber with overhead tracks. Bactericidal lamps are staggered in pairs on illuminators at a distance of 0.4-1.5 m from product to be treated so that ultraviolet beam angle is 30-90 deg relative to product surface. EFFECT: increased efficiency, simplified method and construction and provision for obtaining safe and high-quality product. 2 cl, 2 dwg

Description

 The invention relates to the field of veterinary medicine, in particular to the veterinary and sanitary processing of raw meat in meat processing enterprises in the process of defrosting / thawing /.

 When defrosting meat carcasses, half carcasses or quarters, microbiological changes occur: mold fungi develop intensively on the surface, and the development of bacteria preserved and introduced from the outside accelerates; meat becomes unstable during storage. In connection with the increase in microbial contamination of meat raw materials, the question arises of decontamination of the surface of carcasses, ambient air and rooms for thawing.

 A known method of disinfection of livestock products during defrosting by exposure to ultraviolet radiation on them / Gorbatov V.M. Manerberg A.A. "The use of cold in the meat industry." M, Pishchepromizdat, 1963, p. 194 198 /.

 Also known is a device for implementing the method of disinfecting livestock products during deformation, including bactericidal UV lamps, irradiators / ibid., P. 195 /.

 The known technical solution only theoretically relates to aspects of UV exposure to microflora. The authors are limited to the data of laboratory experiments and do not concern the mechanism for the technical implementation of the obtained data on an industrial model, i.e. in practice, the proposal in the meat industry cannot be used.

 The aim of the invention is to improve the quality of the target product due to the decontamination of raw meat / carcasses, half carcasses, quarters / during defrosting.

This goal is achieved in a method of disinfection of livestock products during defrosting by exposure to ultraviolet radiation on them by the fact that ultraviolet radiation is carried out every 10 12 hours of defrosting continuously for 1 2 hours with an intensity of 8 10 W / m ³ wavelength 250 260 nm.

This goal is also achieved in a device for implementing the method, including bactericidal UV lamps, irradiators, a control panel with signal lamps, the fact that bactericidal lamps are installed on the irradiators in pairs at a distance of 0.4. 1.5 m from the irradiated object in a checkerboard pattern. The angle of incidence of UV rays on the surface of the irradiated object is 30.90 ^o .

 This goal is also achieved in the device by the fact that the bactericidal lamps are located on the ceiling and / or on the surface of the walls, and / or between the suspension ways, evenly.

 In the patent and scientific and technical literature, technical solutions are known that are similar to the claimed ones, that is, the proposal meets the criterion of "novelty."

 Also, the claimed decision was tested on A.O. "Refrigerant", i.e. the proposal is "industrially applicable".

 The use of ultraviolet radiation only with certain modes allowed to obtain a positive effect of the proposal, i.e. The claimed technical solution meets the criterion of "inventive step".

 In FIG. 1 and 2 shows a diagram of the device.

The device for disinfecting livestock products during their defrostation contains 1 / cm bactericidal UV lamps. FIG. 1 / with irradiators 2, a control panel 3 with signal lamps on the front door 4. Moreover, bactericidal lamps are mounted on the irradiators in pairs at a distance of 0.4 - 1.5 m from the irradiated object / see Fig. 2, 5 / staggered on the ceiling / Fig. 1 / or between overhead tracks / FIG. 2 / or on the surface of the walls / Fig. 1 / uniformly, the angle of incidence of UV rays on the surface of the irradiated object is 30.90 ^o .

The operation of the device is as follows. Beef carcasses / pork / with a temperature of -8 ^o C at a distance of 0.5 m from each other are placed in hooks along monorail suspension ways in a 462 m ³ defrosting chamber. In the chamber on the irradiators, bactericidal lamps with a power of 30/60 / W are installed in pairs at the level of the suspended tracks and on the surface of the walls at a distance of 0.4 1.5 m from the irradiated object. The front door is closed, while the door locking mechanism is activated and the signal lamp lights up. They turn on the power and set the operating modes of the bactericidal UV lamps using the control panel located outside the camera. Germicidal UV lamps begin to emit a stream of rays with an intensity of 8 10 W / m ³ at an angle of 30 90 ^o to the surface of the irradiated object. After 1 2 hours, the time relay automatically turns off the device and warning lights, the entrance to the camera is unlocked.

To control the quality of disinfection / by bacteriological methods / under sterile conditions, samples are washed away from an area of 100 cm ^{2 of} irradiated objects in three to six replicates and examined for general microbial contamination before UV irradiation of the surfaces / background studies / and after disinfection according to generally accepted methods. Crops are carried out on special nutrient media (Endo medium, MPA with 8.5% NaCl, wort agar, etc.) to isolate and identify sanitary indicative microflora / E. coli, Proteus, staphylococci, mold fungi, etc. /. The total microbial contamination and the spectrum of microorganisms in the air of the defrosting chamber are determined using the cup impactor VNIIVSGE.

 The seediness of the surface of thawed carcasses is reduced by 2.5 times, walls, ceiling by 4.5 times, air by 85% including the content of molds 2 times.

 Example 1

60 frozen beef carcasses with an interval of 0.5 m are placed in a defrosting chamber with a volume of 462 m ^3. Bactericidal lamps are located at the level of overhead paths on the frames and on the walls of the chamber at a distance of 0.4 m from the irradiated objects. The irradiation intensity of 8 W / m ³ , waves 250 260 nm, the angle of incidence of UV rays 30 ^o . Irradiation is continuous for 1 hour with an interval of 10 hours twice during the 20-hour defrosting process. The seeds before irradiation amounted to: surface of carcasses 8.8 • 10 ⁴ , walls 4.34 • 10 ⁴ , ceiling 3.05 • 10 ⁴ m.cl./m ² , air 7.20 • 10 ⁴ m.cl / m ³ . After processing in this mode, the indicators of microbial contamination amounted to 4.2 • 10 ⁴ , 2.0 • 10 ⁴ , 1.56 • 10 ⁴ mcl respectively. / m ² and 36.0 • 10 ⁴ m.cl./m ³ , i.e. decreased by 2 times.

 Example 2

60 frozen beef carcasses with an interval of 0.5 m are placed in a defrosting chamber with a volume of 462 m ^3. Bactericidal lamps are located at the level of suspension paths and on the walls of the chamber at a distance of 1.5 m from the irradiated objects. The irradiation intensity is 10 W / m ³ , the wavelength is 250 260 nm, the angle of incidence of UV rays is 90 ^o . Irradiation is continuous for 2 hours with an interval of 12 hours during the 20-hour defrosting process. Seeding after irradiation of the surfaces of objects is reduced by 2.5 times.

 Example 3

In a defrosting chamber with a volume of 462 m ^3, 60 frozen beef carcasses are placed at intervals of 0.5 m. Bactericidal lamps are located at the level of overhead tracks and on the walls at a distance of 1 m from the irradiated objects. The irradiation intensity is 9 W / m ³ , the wavelength is 250 260 nm, the angle of incidence of UV rays is 60 ^o . Irradiation is continuous for 1.5 hours with an interval of 11 hours twice during the 20-hour defrosting process. After irradiation, the seeds were reduced 2.5 times on the carcass surface, 2 times on the ceiling and walls, microbial air pollution 2.5 times / optimal values /.

 Thus, the proposal allows to improve the quality of the target product by reducing the seeding rate by 2.5 times compared to the known method, while the environment is not polluted by chemical disinfectants. At the same time, disinfection of the surfaces of the chamber, equipment, and air pool is carried out.

Claims (3)

1. The method of disinfection of livestock products during defrosting by exposure to ultraviolet radiation, characterized in that the exposure to ultraviolet radiation is carried out with a radiation intensity of 8 10 W / m ³ and a wavelength of 250 260 nm continuously for 1 2 hours every 10 12 hours in throughout the defrosting process. 2. A device for disinfecting livestock products during defrosting, including a camera with suspended paths, bactericidal lamps mounted on irradiators, a control panel with signal lamps, characterized in that bactericidal lamps are installed on irradiators in pairs at a distance of 0.4 1.5 m from the disinfected product and in a checkerboard pattern, while the bactericidal lamps are installed so that the angle of incidence of UV rays on the surface of the product is 30 90 ^o .  3. The device according to claim 2, characterized in that the bactericidal lamps mounted on the irradiators are located on the ceiling and / or the surface of the walls of the chamber, and / or between the suspended paths.

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