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A Module for Thermal Pest Control in Stored Raw Materials Used in Feed Mills / Food Manufacturing Industries

By Animal Research International, University Of Nigeria, Nsukka.

Summary

Pests have continued to be problematic in warehouses of most feed mills and food manufacturing industres. Pests are heterogeneous both in space and time, creating gradients and patterns depending on the prevailing environmental variables. Pest control efforts have utilized manipulations of these variables. This project is ona module for thermal control of pests using the hitherto waste steam from the indusries. The module is an engineering contraption, which uses steam to raise temperature within it to insecticidal levels (above 45°C). This causes halt in development and proein denaturing (leading to mortality) of the pests (eggs, larvae and adults). This applied heat also toasts the material inside the module thereby improving its quality. The module consists of a rotary drum with steam passing through convoluted tube (without coming in contact withthe handledmaterial), with a capacity o 2 tons/hr o commodities. It accepts steam at 130°C and discharges it at 110°C. The steam pressure (permssible) is 2.7 bars. Steam velocity is 8m/s. The volume of the drum is 4 m3. A two- screw- 90 degrees-lead –counter screw-rotation typebaffle is installed to achieve even distribution of heat on the material within the drum. The moduleis efficient, effective and useful in any integrated pest management effort.
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