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Design, Fabrication, and Performance Evaluation of a Vermicomposting Machine

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Document pages: 8 pages

Abstract: Present conventional vermicomposting entails a greater portion of production cost due to the long duration of harvesting and high labor requirement. A vermireactor device was designed, fabricated and evaluated with the aim of reducing time and labor requirements during harvesting. Testing and evaluation were done to establish optimum screen size at the different moisture content (MC) of vermicompost. Power was measured at different loading depths and the relationship was then subsequently analyzed by regression analysis. The effectiveness of the device was compared to conventional vermicomposting in terms of processing capacity, efficiency, and labor requirements. Results revealed that capacity was affected by screen size and moisture content (MC) while, efficiency was affected by the interaction of screen size and moisture content. The optimum screen size of 50 x 50 mm at 35 MC of vermicompost yielded the highest capacity and efficiency of 346.8 kg min and 85.57 , respectively. The relationship of power and depth was analyzed using regression analysis resulting in a linear equation Y = 0.0091x + 0.0759 and an R2 value of 0.9674, where y and x are power and depth respectively. Labor reduction was achieved during vermicomposting with the use of the vermireactor device requiring only 74.5 man-hours while 98 man-hour on conventional vermicomposting. The cost of fabricating the device is P25, 703.09 and production of cost of P1.42 kg with a break-even weigh of 3703 kg against current unloading practice of P2.35 kg.

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