Design and Development of a Goat Manure Grinding Machine for Compost Production

Abstract

This study aimed to design and construct a goat manure grinding machine and to investigate its optimal operating conditions for enhancing composting efficiency. Goat farming generates substantial amounts of manure, and reducing particle size prior to composting increases surface area, accelerates microbial activity, and improves nutrient uptake by plants. Experiments were conducted at three operating speeds 904, 1,201, and 1,827 rpm. The results showed that production capacity increased with higher speeds, with the maximum output of 163.19±23.34 kg/h achieved at 1,827 rpm using a 2-inch drive pulley. Ground manure at this condition was subsequently composted, and the composting period was reduced from 15 to 11 days, as the Increase of surface area enhanced microbial degradation. The resulting compost improved soil friability, decomposition rate, and nutrient
absorption by plants. An economic evaluation indicated a break-even point at 8,304.35 kg of processed manure, equivalent to approximately 51 operating hours. These findings demonstrate that the developed grinder adds value to goat manure, reduces composting time, and significantly improves both production efficiency and economic feasibility.