To increase the production of methane, when cattle manure (CM) is digested, pretreatments can be applied and/or the manure can be co-digested with other wastes. In this research work, a mixture of CM, food waste (FW) and raw glycerine (Gly) in a proportion in weight of 87% CM, 10% FW and 3% Gly was digested, (a) without pretreatment and (b) with pretreatment by ultrasound, applying a sonication energy of 1040 kJ/kg total solids. Specific methane production was 290 L CH/kg volatile solids (VS) without pretreatment and 520 L CH/kg VS with pretreatment. With respect to the volumetric methane production, 1.07 L CH/L.day was produced in the first case, and in the second case, 1.98 L CH/L.day. We can conclude that the application of ultrasound pretreatment significantly improved the production of biogas.
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