Optimalisasi Limbah Kubis dan Limbah Cair Tapioka sebagai Bahan Alternatif Biogas Ramah Lingkungan

Abstract

Human growth in Indonesia makes the level of energy consumption increasing. One of the renewable energy sources is biogas from anaerobic fermentation of organic matter. Co-digestion is a technique to produce biogas that is being widely developed. Cabbage waste is the most common garbage found. The selection of cabbage vegetables, besides being able to be degraded by microbes, because it has a high C/N ratio of 14.29. Liquid waste from the tapioca industry has a nitrogen content of 0.46% and carbon 39.58%, with a C/N ratio of about 86:1. This research requires 3 materials, namely cabbage vegetables, tapioca industry liquid waste, and activated sludge. The research method used is divided into 3 stages, namely material preparation, operation stage, and analysis stage. In the biogas production process using a combination of cabbage vegetable waste and tapioca industry liquid waste, it was found that optimal production occurred at a C/N ratio of 25 with the highest cumulative biogas volume in 60 days of 7435.3 mL. Of the overall variables conducted in this study, it was found that the highest yield in biogas production was 115.9 liters of biogas / kg COD produced in the stationary phase, namely variations of C/N 25 with rumen microbes.