Anna I. Getchell, kshields@fs.fed.us, Kansas State University, Any Street, Manhatten, KS
Catalytic infrared radiant energy effectively destroys eggs, larvae, and adult grain insects when applied under certain conditions of exposure time and radiant frequency. Catalytic infrared radiant energy is generated by reacting the oxygen in air with natural gas or propane using an enhanced/proprietary platinum catalytic elements. The temperature of the elements are set to 500 -800 deg. F, generating a peak wavelength range of approximately 3 to 7 microns.
Grain insects contain more than 50% moisture, while the stored grain is usually below 20% moisture. Water readily absorbs radiant energy at wavelengts of 3.5, 4.0 and 6.0 microns. The moisture in the insects quickly absorbs the radiant energy, rapidly heating the insects up to lethal temperature.
Experiments conducted at Catalytic Industries' headquarters by entomologists from Kansas State University demonstrated high mortality rates and minimum/no emergence of weevils after appropriate incubation times. Processing times were in the 30 second to 1 minute exposure range on a continuous vibrating conveyor with IR elements positioned above the product stream.
Processing conditions, equipment configurations, commercial scale equipment costs and operating costs are presented.
Species 1: Coleoptera Tenebrionidae
Tribolium castaneum (Red flour beetle)
Keywords: Infrared