The aim of the paper is to investigate the opportunity of the cogeneration projects using generated biogas from manure. The authors have proposed a method for sizing different equipments for the biogas valorization chain. The CO_2 reduction due the biogas use has been calculated considering the fuel savings in cogeneration plant. A part of the article presents different methods for making a biogas plant become feasible. The results are presented as variations of the payback period of the investment in function of the farm's size. Sensitivity analyses are made for determining the most important factor influencing the rentability of the biogas plant.
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