Abstract
Tests were conducted on a well-sealed, 100 tonne capacity bin to compare the use of two different modified atmospheres: carbon dioxide, and the exhaust gas produced by propane combustion. Both treatments were effective in killing grain pests. For both gases the efficiency of purge increased with flow rate over the range tested, and atmosphere maintenance was accomplished more efficiently by adding gas to the head-space rather than the hopper bottom. The advantage of head-space maintenance was greater for burner gas (< 1% oxygen) than for 60% carbon dioxide in air. Costs for modified atmosphere treatment of the experimental bin were up to 10 times greater for carbon dioxide than for burner gas.
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