Manure is a major management problem in livestock farms today. A successful and economically sustainable way to manage the livestock manure is the production of biogas in anaerobic fermentation plants. Combined heat and power production (CHP) systems, or simply “cogeneration systems”, can utilize the biogas supplied by these plants and produce clean electric power and heat.
The amount of biogas produced in such plants depends on the type of animal that the farm breeds. For example, poultry manure has a bigger capacity than cow or pig slurry. In any case, the amount of biogas produced varies between 20 and 100 cubic meters per ton of animal waste.
Power supply with stability and flexibility
The natural gas supply from the local network can be used in the gas engine-based cogeneration systems providing a stable supply of electrical power. When needed, power supply can be isolated from the local electricity grid and serve the local loads of the facility. The heat produced by the engine can be recovered either as hot water or as steam for use by surrounding operations. Moreover, the recovered heat can be fed into an absorption chiller to produce a source of cold water, if there is a local need for cooling loads. This cold water can in turn be used to support a refrigeration or air conditioning system. Such systems, providing electricity, heat and cooling, are called trigeneration plants.