Dehumidifying cassava leaf and trunk by rotary dryer for processed animal feed

Abstract

The purpose of this project was to study the dehumidification of cassava leaves and trunks by rotary dryer for animal feed processing. The physical properties of cassava leaves and trunks and the dehumidification of cassava leaves and trunks using sunlight were studied to compare the results of dehumidification by a rotary dryer. In the process of rotary dryer dehumidification, the control factors were a drum speed of 4 rpm, feed rate 120 kg/h and hot air temperature of 140^oC, and 3 h of drying time. The study factors were three levels of hot air speed: 2.0 m/s, 2.5 m/s, and 3.0 m/s. According to a study of the physical properties of cassava leaves and trunks, the average initial humidity was 60.42%wb. Also, the size of the chopped cassava leaves and trunks by the sieve shaker in the sieve size of 4.75 mm had the highest residue, 53.12% and had an average particle size at 16.08 mm. Compared to sunlight method, the study of dehumidification of cassava leaves and trunk by rotary dryer revealed that a rotary method dryer was more effective than sunlight method. The rotary dryer's optimal setting was a hot air speed of 2.0 m/s, specific energy consumption (SEC) of 31.40 MJ/kg_water, and drying rate (DR) of 25 kg/h. The statistical analysis shows the relationship between hot air speed and drying rate. It’s shows that different hot air speed to different drying rate at 95% confidence.