THE ENERGY VALUE AND ECONOMIC EFFICIENCY OF BRIQUETTES AND PELLETS PRODUCED FROM DIGESTATE OBTAINED FROM A BIOGAS PLANT MIXED WITH SAWDUST

Primary energy sources have limited deposits and their exploitation has a negative impact on the environment. Biofuels production is efficient and profitable methods of environmentally-friendly energy production in terms of economic reasons. In recent yearsuse of RES in the Polish energy balance can be noticed. The main sector in which can be observe the dynamic growth is the biomass market, with the solid biofuel market in particular. The resulting product of the process, except for the biogas, is the digested pulp. The aim of this research was to perform an economic and energy analysis of briquettes and pellets production. The obtained results of economic analyzes have shown that the individual production of solid biofuels from digestate is more profitable than using sawdust as a substrate. The calorific value of the solid biofuel produced from the digestate (DSF) can be compared to the calorific value of biofuel generated from sawdust. The digested pulp can be considered as an alternative to the sawdust in the production of solid biofuels.