Design and fabrication of Portable Leaf Shredding Machine for Compost production
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Date
2023
Authors
Kathryn Joy Corpuz and Alyanna Janella P. Trinidad
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Abstract
The study aims to develop a leaf shredder to reduce the size of biomass prior for compost. The objective of the study was to design, and evaluate a portable leaf shredding machine for compost production, the proposed leaf shredder in terms of its capacity, efficiency, practicle size distribution and cost ownership and use.
Response Surface Methodology using Box and Bechnken was employed in fractional factorial to evaluate the parameters affecting the machine performance such as blade rpm (3 levels), blade design (3 levels) and screen size (3 levels).
Analysis showed fast rotation of the blade and the use of combination blades and large screen size resulted to highest attainable capacity of 40 kg/hr, efficiency across all tests resulted to a mean of 96.99% (SD=2.10, CV=2.16%). Practice size distribution of the shredded samples full within 6 mm < x < 12 mm. The overall cost of the implement Php 29,780.58 per year can be incurred for an annual capacity of 7.28 tons of materials to be shredded. Operating cost was found to be 4.09 Php/kg of material.