فهرست نشریات علمی دسترسی آزاد ایران

Restaurant waste is a potential biomass to be developed into a renewable energy, especially in biogas production. It is the main substrate for anaerobic process, as it contains many organic materials. Tofu liquid waste and cow dung have the potential to be used as an additional substrate in this process. This research aims to determine the effect of variations in the restaurant waste, tofu liquid, and cow dung composition towards the quality of methane gas in biogas production. It was conducted using a 30 liters reactor with a working volume of 22.5 liters. The substrate variables included 50%, 93.75%, and 100% variations of restaurant waste, 50% tofu liquid, and 6.25% cow dung. The results showed that the variations in the organic waste composition affected methane gas quality in biogas production. The reactor with 100% restaurant waste substrate, obtained the highest yield in each parameter. The anaerobic treatment with 100% restaurant waste substrate in reactor C yielded the highest values for each parameter. Additionally, the largest volume of biogas formed in this reactor was 109 liters, with a methane gas concentration of 51.307 ppm which is followed by reactor B and then reactor A with biogas production of 48 Liters and 45 Liters. The ratio of methane and carbon dioxide levels in the biogas formed was 60% and 40%.