THE UTILIZATION OF BIOGAS SLUDGE BIOCHAR TO LEAD ZERO WASTE SYSTEM IN BIOGAS IMPLEMENTATION: THE EFFECT OF VOLUME ON CARBON DIOXIDE AND METHANE CONTENT. INTERNATIONAL JOURNAL OF GEOMATE. 2021;20(79):119-124. Accessed April 19, 2026. https://geomatejournal.com/geomate/article/view/237