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The main purpose of the publication was to show the differences in revenues, costs and profits when using manure directly as a fertilizer (after storage) or as a substrate for a biogas plant equipped with a cogeneration unit, and then using the digestate for fertilization purposes. The comparison includes cost, revenue and profit streams throughout the year. It also takes into account the introduction of additional co-substrates in order to increase the yield of biogas (biomethane), and thus the profits from the f...

The aim of the work was to present the role of composting as one of the simple and cheapest methods to reduce GHG emissions from cow manure - conclusions from the MilKey and MELS projects. The article contains both the results of some studies analyzed within the above projects, as well as the methodology of conducting composting studies. The method of managing animal waste by composting or co-composting has been known for a long time and used in many places around the world. However, this is not always done in an ...