Construction Design and Performance of Dry Leaf Shredder with Vertical Rotation for Compost Fertilizer

: One of the large private universities (PTS) in Riau Province is known as Universitas Islam Riau (UIR). UIR is a large university and has extensive land infrastructure that is planted with a variety of green plants such as trees and flowers. These trees have encountered many problems, namely producing leaf litter and causing problems. Lots of leaf litter is collected and disposed of at the final disposal site. Some can be processed into compost manually and some are burned. In the composting process, the processing time is too long, so it is necessary to design a construction machine for crushing dry leaves. This machine consists of an inlet and outlet, a tube made of drums, a five-level shredder and with an electric motor. From the results of the design of the construction size length 60 cm width 60 cm and height 100 cm made of angle iron L profile size 40 x 40 x 4 cm with a power of 12 HP and 1400 rpm motor drive rotation. From the results of engine performance tests, the production capacity of 40 kg/hr in the form of final process chips size of 5-10 mm and 92% efficiency. From the results of this machine design can accelerate the process of making compost and can be used by students in developing the entrepreneurship unit of the Faculty of Engineering students.