POTENSIAL OF TOFU WASTE AS BIOGAS WITH THE ADDITION OF MANURE AND SAWDUSTNURINA FITRIANI, FIRRA ROSARIAWARI AND ANDNURUL QOMARIYAHAbstract The use of fuel contributes to emissions to the air, burning plastic waste as fuel in tofu factories and cattle farms contains dioxins which pollute the surrounding environment moreover its fume is very concentrated and emits very fuel smells. From a health perspective, it causes cancer and respiratory problems. Green fuel replacement is needed to reduce emissions released into the air. The biogas product is a fuel that contains methane (50% - 75%) and carbon dioxide (25% - 40%), with small amounts of hydrogen sulfide, nitrogen and oxygen. This research used manure, tofu waste, tofu dregs, and sawdust varied by 10% NaOH pretreatment method. The process is carried out anaerobically to produce methane gas on the 30th day of (36.67%) with a ratio of manure: tofu dregs: tofu waste: saw dust (without pretreatment) (1 : 1 : 2 : 2), the content of CO2 ( 4.044%) and air content (59.28%). The color of the fire and the duration of the flame were analyzed every 10th, 15th, 20th, 25th, 30th day and the largest flame duration was 6.39 minutes with a blue flame. |