Disinfestation and pasteurization equipment
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Disinfestation and pasteurization equipment - 1

“RF” DISINFESTATION & SANITISATION of AGRICULTURAL COMMODITIES The larvae and insect infestations, as well as the contamination by molds, yeasts and bacteria of various type and origin, cause major problems in the storage, processing and marketing of agricultural commodities such as nuts, pulses, cereals, etc. As of today, chemical fumigants have been used to control these contaminants; however, environmental impact and health implications have reduced the customer acceptability even when there are no legislative constraints. In addition, the growing market for integrated and organic productions has led the manufacturers in the supply chain to implement “ecofriendly” technologies, including thermal methods. Conventional heating techniques based on steam and/or air are simple and easy to control, however they also are intrinsically slow and, therefore, detrimental to the product quality. The endogenous heating treatment by means of electromagnetic waves allows the rapid and uniform heating of different types of products, with or without shell, in bulk or packed, of any size. Certified scientific research and microbiological analyses laboratories have validated the effectiveness of the Radio Frequency technology in this application context. The “RF” Solution The effectiveness of Radio Frequency heating as a method for the disinfestation and sanitisation of nuts, pulses and cereals is determined by the following factors: · Time: the process is faster than conventional heating (3 to 10 times depending on the situation), considering that 3÷5 minutes are sufficient to rise from room temperature up to 55÷65°C (disinfestation) and 7÷10 minutes up to 80÷100°C (sanitisation). · Mortality: according to the time and temperature conditions, even the most heat-resistant contaminants, in all their development stages, can be eliminated up to 5 log reduction. Germination: depending on process temperature, it is possible preserve or inhibit the seed germination. · · Quality: the minimal thermal impact determined by such mild temperature/time conditions, preserves at best the physical, chemical, sensorial and nutritional properties of the host commodity. · Process Costs: approx. 25 kWh are required to treat 1 ton of product (Delta T approx. 30÷35 °C), which translates into a cost of 2÷4 EUR/ton, competitive with the traditional technologies.

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Disinfestation and pasteurization equipment - 2

In the STALAM "RF" system, the product is fed to the inlet section by means of an in-built volumetric hopper feeder, that guarantees the load consistency and the desired thickness, and is conveyed through the treatment tunnel by a food-grade conveyor belt. In the treatment tunnel the product passes through the electromagnetic field generated by a pair of electrodes placed above and below the conveyor belt. The Radio Frequency energy supply is accurately adjusted to ensure a perfectly controlled process on a wide range of medium to low moisture content products. The PLC control ensures...

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