Effect of Heating Time and Mixing Frequency of Food Waste Composting Machine

            This research objective is to investigate the effect of heating time and mixing frequency to be optimally used in food waste composting machine. This work simulated by using food waste consisting of cooked rice : boiled pork : fried chicken skeleton : fresh vegetable : banana peel. The ratio by weight is 1:1:1:1:1 with the total weight of 1 kg. At the first input of food waste, 300-g dried leaves were added as a binder while microorganism (Microbial Activators PD1) in the ratio of 30 g per 250-ml water was added. The food waste was added every 2 days for 21 days in 20-L composting tank. The heat was supplied to control the temperature outside the tank at 40°C for 3 conditions: No Control (NC), 24 hr, and All Time (AT). The mixing frequency was set at either 1 time per day or 12 times per day. From the experiment, the best heating time is to control AT. If the heating time is AT, the mixing frequency has little effect. If there is no heating, the mixing frequency has significant effect. The best sample has pH between 6.5-8, 100% passed mesh 12x12 mm, and the appearance being crumbly and black like soil as required as an organic fertilizer. in addition, the sample has N, P and K at high value.