Plant wastes, which have a significant potential in our country, are used as biofuel energy sources and gain importance. There are various methods for obtaining energy from these wastes. One of these methods is pelleting method. The aim of study is pellet production from pistachio shell (PS) that obtained from the pistachio processing plant and spent olive cake (OC) which obtained from olive oil processing plant together with identification of physical, chemical and mechanical properties of the produced pellets. 5 different pellets were produced by 5 different combinations of pistachio shells and olive cakes (100% PS, 75% PS+25% OC, 50% PS+50% OC, 25% PS+75% OC ve 100% OC). Pelletization was done with the circular, tiered perforated and plain formed pelletizing machine which has 6 kW engine power and 70-90 kg h-1 slicing capacity. In the study, pellet density, fracture strenght and dehumidification ratio were found between 973.70-1191.96 m(3) kg(-1), 99.21-99.87% and 19.12-22.24%, respectively. Maximum pellet density was found in %100 OC mix, vertical compressive stress resistance was found in 100% PS mix. Moisture content values of pellets are appropriate for the Europe Pellet Council standards. While the lowest volatile substance content has been measured in 100% PS, the highest volatile substance content was measured in 25% PS + 75% OC mix. Maximum vertical compressive stress resistance occured in 100% PS. Ash content of the pellets were between 5.974% and 10.083%. While the most sensitive material to be broken is 50% PS+50% OC, the most enduring material to be broken is 100% PS. Pellet diameter and lenghts are appropriate for EN16127 standards. Vertical compressive stress resistance are between 157.17 and 235.08 N. The most dehumidification rate was seen in 100% OC, while values are so close. Our country has good potential and diversity for biofuel sources but can not be used efficiently. These sources must be used as pellet forms and be made a big contribution to country economy.
