ORGANIC CYCLE SYSTEM: THE RECYCLING OF BIOGAS SLUDGE OF COW MANURE AS BIOCHAR FOR BIOGAS PURIFICATION . International Journal of Geomate, [S. l.], v. 19, n. 72, p. 96–101, 2020. Disponível em: https://geomatejournal.com/geomate/article/view/1130. Acesso em: 13 oct. 2026.