Article ID Journal Published Year Pages File Type
4517215 Journal of Stored Products Research 2011 6 Pages PDF
Abstract

Recent efforts have focused on improving the application of ozone technology as a pest management tool for stored grain. This study evaluated the efficacy of a modified screw conveyor to treat grain with ozone in a continuous-flow system. The ozone concentration delivered into the screw conveyor was 47,800 ppm and the average retention time for a corn kernel moving through the system was 1.8 min. Under these conditions, 100% mortality of adult red flour beetle (Tribolium castaneum (Herbst)) and adult maize weevil (Sitophilus zeamais (Motsch.)) was achieved after three passes through the screw conveyor, which equated to a concentration × time (CT) product value of 258,120 ppm-min. The potential effectiveness of the continuous treatment to reduce mold on the surface of corn kernels was also explored. Aspergillus flavus counts were reduced by 96% in a single pass through the screw conveyor. Three passes through the screw conveyor reduced the mold count by more than 2-log units. Ozone treatment also reduced aflatoxin applied to the grain; however, the reduction was not sufficient enough to be of commercial value. The results of this study provide valuable information for estimating the parameters needed for effectively treating grain in a commercial scale continuous-flow treatment system.

► In this study, the efficacy of a screw conveyor system to deliver ozone was tested. ► The effects of residence time on insect mortality and mold reduction were noticeable. ► 100% adult insect mortality and significant mold reduction achieved with a 6 min of ozone treatment. ► Treatments with humidified and dry ozone had similar effects on fungi and insects.

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Life Sciences Agricultural and Biological Sciences Agronomy and Crop Science
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