The microwave sterilization technology. Dielectric material sterilization microwave equipment
The microwave sterilization technology is based on the volume dielectric heating. It is
characterized by high efficiency of sterilization and high efficiency of the microwave energy
conversion into heat energy.
The equipment for soil and mineral substrates sterilization consists of the sterilization
chamber, microwave energy source and control unit. The sterilization chamber is a
rectangular microwave resonator with useful volume of 4,8 m3.
The microwave energy source is a set of magnetron generators (from one to three
depending on the required productivity). The control unit ensures the necessary operation
conditions (time, power). The operation safety is ensured by the original construction of the
sterilization chamber and blocking system.
Dielectric material sterilization microwave equipment
Microwave sterilization technology - It is a high energy-saving technology to sterilize the products and materials for different branches of industry and agriculture. High absorption of microwave energy by dielectric lies in the basis of this technology. It is free from intermediate heat-transfer agents.
Microwave sterilization technology enables to sterilize soil and mineral substrates used in hothouses when growing agricultural products. Soil microwave sterilization technology is based upon the sterilizing effect of microwave electromagnetic oscillations. The effect lies in a selective heating of pathogenic microorganisms which are important dielectrics. Эффект заключатся в избирательном нагреве. Under the impact of SHF pathogenic agents crumble away owing to their temperature high speed increase.
Microwave sterilization technology is characterized with:
- high efficiency of conversion of microwave energy into thermal energy released in a heated product,
- non-contact selective heating of the processed material,
- thermal non-persistence.
The use of microwave energy in thermal technological processes reduces specific power consumption by 25-40%. It also favors to stabilizing the quality of the processed material.
Microwave sterilization equipment
The equipment is aimed at sterilization of dielectric materials:
- compost
- humus
- food supplements etc.
- infections
- weed seeds
- destructive insects
The sterilization enables RETENTION of- processed product value
- soil fertility
- heating resonant chamber
- microwave modules
- control board
Key features of the equipment for sack-packed subsoil sterilization
| Performance, tons/24 hours | 1…2 |
| Power supply, KWt hours | 8…9 |
| Microwave modules count, pieces. | 6 |
| Operating frequency of electromagnetic energy source, MHz | 2450+-100 |
| Supply voltage | 380 В, 50 Hz (220 V, 50 Hz) |
| Weight, kg | 1800 |
Indices of microwave sterilization efficiency
| Agents |
Intensive spores.
before treatment, %
|
Intensive spores.
after treatment, %
|
Agents inhibition, % |
| Fusarium oxysporum (root rot) |
92.8 | 0 | 100% |
| Botritis cinera (gray mold) |
94.9 | 0 | 100% |
| Sclerotinia sclerotinian (White rot) |
85.4 | 0 | 100% |
| Corinebacterium michiganeuse (bacterial cancer) |
76.3 | 0 | 100% |
| Developmental stages |
Amount of viable eelworms
in 0,1 ml of soil extract
before treatment
|
Amount of viable eelworms
in 0,1 ml of soil extract
after treatment
|
| Larva | 6.2 | 0 |
| Female | 7.0 | 0 |
| Male | 7.2 | 0 |
| Agents before treatment |
Agents after treatment |
| Ascohyta cucumeris spores - 17-18 pieces | Mycelium fragments |
| Saprophytic fungi spores– bulk quantity | Mycelium fragments |
| Colletotrichum spores – bulk quantity | Mycelium fragments |
| Botritis cenerea spores – bulk quantity | Mycelium fragments |
| Agent |
Colonies availability
after radiation of living
|
Colonies availability
after radiation of dead
|
Agents inhibition, % |
| Ascochita | 0 | 10 | 100 |
| Colletotrichum | 0 | 20 | 100 |
| Botritys | 0 | 16 | 100 |
| Aspergillus | 0 | 22 | 100 |
| Mucor | 0 | 40 | 100 |
