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Fumigation

Toxic Substances have so far been used to control/destroy insects e.g. Ethylene Dioxide is used for disinfestation of foods but these toxic substances are coming in for increasingly stronger criticism. Substances like Methyl Bromide, Hydrogen Phosphide etc. also face the problem of residues seriously.

Therefore, research was undertaken to substitute and supersede such chemicals with natural residue-free and environment friendly disinfestation processes. In this new process of fumigation evolved the originally packed agricultural product is exposed to pressurized CO? atmosphere. The infestation is done on the optimum condition and cycle time of few hours is required for the products which have to be fumigated. No special pre or after treatment is necessary. Products are taken to a special enclosure and the enclosure is flooded with gaseous CO2 to the required final pressure and the subsequent expansion takes place in another vessel.

By avoiding the use of the so far commonly employed poisonous gases, with a procedure of pressure disinfestations with Carbon Dioxide (CO2), the procedure is environmentally compatible and thereby eliminates the problems of residues.

Fumigation Process


Production of CO2

Carbon dioxide can be obtained out of the following six processes :-
  • From thermal decomposition of limestone, CaCO3, in the manufacture of lime,ie, CaO.

  • As a byproduct of sodium phosphate manufacturing process.

  • CO2 emerges as a byproduct in ammonia and hydrogen plants, where methane is converted to CO2.

  • From combustion of wood, fossil and petro fuels like deisel, kerosene, natural gas etc.

  • As a byproduct of fermentation of sugar in the brewing of , and other.

  • Directly from natural carbon dioxide springs, where it is produced by the action of acidified water on limestone.
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