Due to the coexistence of lignocellulosic materials and syn-thetic polymers in solid wastes in very large quantities, these require effective co-management. The pyrolysis, as a non-oxidative thermochemical conversion process, is a simple way of cellulose degradation with a formation of various liquid products,mainly monosaccharides, furans and pyrans derivatives [17,18].The fact that polyolefins are rich in high hydrogen (14%) and carbon contents may raise the interest of obtaining liquid compounds (hydrocarbons) characterized with high calorific value. It is assumed that polyolefinic polymers may provide hydrogen during pyrolytic conversion of biomass and increase the bio-oil production[19