註釋 Olive mill waste (OMW) is generated from olive oil extraction in olive mills. It contains a very high organic load and high concentration of phytotoxic compounds. In Mediterranean countries, this OMW is usually discharged directly to the sewer network or stored in central lagoons or small ponds. These ponds produce odour problems and can often negatively affect ground water. The high chemical oxygen demand (COD) and the low biodegradability due to the high concentration of phenolic compounds make OMW an important environmental issue in the Mediterranean area, which is nearly producing 95 % of all olive oil worldwide. Nowadays, with the restrictive regulations concerning wastewater discharges, the interest in developing new technologies for treating OMW is growing. The general framework of the proposed work is to promote the sustainable production of renewable energy through biogas production from OMW in small-scale plants, adapted to existing olive oil mills. The specific objective is to study the feasibility of the anaerobic digestion process applied to the treatment of olive mill waste for energy production. In this work, the feasibility of anaerobic digestion treatment of 2POMW and 3POMWW for energy production and its implementation in two and three-phase olive oil mills respectively will be studied. The mixture of the OMW with pig manure to perform anaerobic digestion will also be studied. The biogas plants will be planned with the EcoGas Software (Version 07-E1). This Software is a tool for estimating potential biogas production and is helpful for planning biogas plants. It contains a number of alternative settings which will be used for the simulation, dimensioning and economic analysis of the case study biogas plant. In both cases, anaerobic digestion could be recommended for treating the wastes but it would not be economically feasible and other scenarios should be studied in future works. 