An object of the present invention is to provide an energy recovery system combined with anaerobic digestion and cogeneration using biogas to produce heat and power using biogas generated in the anaerobic digestion of livestock waste water.;Therefore, the present invention provides an anaerobic digestion unit for generating biogas from livestock wastewater; A pretreatment unit for removing water, sulfur compounds, trace harmful substances and the like contained in the biogas generated in the anaerobic digestion unit as gas fuel; An engine unit capable of producing power by using biogas and diesel; A power generation unit for producing electric power using the power of the engine unit; Provided is an energy recovery system combined with cogeneration using biogas generated by anaerobic decomposition of organic matter including a heat exchanger for producing hot water by using cooling water and exhaust heat of an engine.
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