The use of densified biofuels also reduces the costs associated with handling, storage and transportation, due to the increase in bulk density associated with the densification process.
This is the case of olive tree pruning residues, which give rise to significant amounts of residual biomass in the areas where these groves exist .
Other important factors which in- fluence the level of energy usage of agricultural residues are the local availability, the fact that they are dispersed over a relatively large area, the costs associated with the treatments needed for their proper removal , and the lack of sufficient information concerning the combustion and emission characteristics of these residues. This information is important for the design and efficient operation of combustion systems that are fully adapted to the biomass of each region. The final quality of pellets varies depending on the raw material properties and the manufacturing process [12]. The variables dependent on the pelletization process can be controlled to optimize production efficiency and improve the quality of the finished product [11] according to the specific biomass studied