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This work studies the Biochemical Methane Potential (BMP) of the anaerobic digestion of primary wastewater treatment products from the municipal wastewater treatment plant of Thessaloniki. Experiments included the analysis of three different samples: screening products, fat and a combination of them at a ratio of 50 % w/w. The duration of the overall procedure was 73 days and measurements were conducted on a regular basis (biogas accumulation was measured after 6, 12, 19, 27, 35, 40 and 73 days). In order to measure biogas production, the anaerobic digestion process was employed using sludge from the municipal wastewater treatment plant of Thessaloniki. Biogas production was determined by means of anaerobic digestion flasks. In the present study, biogas was determined from the upper area of the closed flask followed by Gas Chromatography (GC) measurements. Small volume samples were taken from the flask by means of an airtight syringe and were injected into the gas chromatograph. The amount of biogas was measured by comparing the obtained chromatogram with a standard chromatogram of a gas mixture of known volumes. For all samples, the amount of biogas was linearly increased during the first 40 days. Then, biogas accumulation presented a peak value until the 73rd day. Sample processing showed a significant biogas production, especially when expressed per gram of total volatile solids (TVS).