Int. J. Biosci.22(1), 45-52, January 2023
Composting is an effective method of managing organic waste from decomposition by microorganisms. This research using composting technique with a modification compost bin with additional chopper on the top of the bin. The composter was designed using an HDPE drum with a height of 100 cm and a diameter of 50 cm with the addition of a chopper and a manual compost mixer as well as a lower cross-section. This research aimed to calculate the amount and composition of waste in TPS 3R Sekumpul and to design modification of a compost bin to handle the problem of organic waste in TPS 3R Sekumpul. The average waste generation in TPS 3R Sekumpul is 66,875 kg/day with the composition of the waste generated including compostable (organic) at 4.28%, resaleable waste at 93.85%, and residual waste at 1.87%. The manual chopper is designed with 7 blades with a slope of 45° which are placed on an iron plate connected to a handle to rotate the chopper. The rotate is in the form of a spiral attached to the rotate handle and connected to the drum cover and the bottom section is a rectangular metal structure having 4 wheels on each side. All of the tools that are designed and made can work smoothly without being constrained during the testing of the tool. The composter drum can accommodate up to 25 kg of compost and leachate in the lower part of the compost bin partition. Assessment of the performance of the compost bin with a chopper is seen from the results of the chopped organic waste produced from the chopper. In the knife chopper test using 5 kg of organic waste, the chopped waste results were obtained with an average size is between 0.5 cm – 1 cm. Compost bin with chopper are designed so that they are easy to operate for households and regional scales. It is expected that the use of the compost bin can facilitate the user so that compost is produced with good quality, large quantity and fast composting time.
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