Raw materials were carbonized in a limited-air vessel with a capacity of 200 L. Twelve kg of rejected
material of municipal waste composting and 10 kg of sawdust (a total of 1/5 of the vessel capacity)
were placed into the carbonization vessel (pictured in Fig. 1). The times required to carbonize rejected
material of municipal waste composting and sawdust were 6 h and 4 h, respectively.