The substrates to biogas production in anaerobic digestion, except plant materials, can also be animal feces and manure. It should be highlighted that Poland is one of leaders in the European Union in animal breeding. However, there is no precise data in the literature on the potential of biogas production from animal feces in this country. The aim of the paper was to analyze the biogas production potential from manure in Poland. The aim of work included anaerobic digestion research following materials: cow manure, pig manure, poultry manure and sheep manure. In the next step, based on the obtained results of the biogas yield, energy potential calculations were made. The methane yield for the investigated feedstock materials in the batch culture technology was performed following the internal procedures developed based on the adapted standards, i.e. DIN 38 414-S8 and VDI 4630. Animal wastes were obtained from the Agricultural Experimental Stations of Poznan University of Life Sciences (Poznan, Poland). On a base of achieved results it was concluded that tested substrates have a high energy potential (approx. 28.52 GWh of electricity). The largest potential for electricity production was found in chicken manure (about 13.86 GWh) and cow manure (about 12.35 GWh). It was also shown which regions of Poland have the best chance for development of agriculture biogas plants (Wielkopolskie and Mazowieckie voivodships) and where the potential is the least (Lubuskie and Opolskie voivodeships).

The investigations of energetic piles on the landfill in Zakurzewo near Grudziądz were done. The study provided answers to the following questions: I - are the piles worth digging up, li - what kind of material may be recovered after that, and Ill - what kind of process dominates currently in piles? It has been found out that plastic. mineral fraction and fraction of waste with the particles at the diameter below 10 mm made up about 75-90% of the total mass of waste in piles. Therefore. in the future these groups should be selected from the whole mass. Small fractions - I fraction of waste (with the particles of the diameter below 10 mm) and li fraction (with the particles of the diameter between 10-40 mm) made up significant share (50-93%) of the total mass of waste in piles. Organic matter content in dry mass of I fraction was high ranging from 71.6-86.8% of d.rn. This fraction can be used as a biological layer on the landfill. but should not be treated as a neutral waste for the sake of lcachuig of high pollutants concentration. fur the sake of low reduction of organic matter further fermentation of waste from piles W I - W6 with biogas recovery is advisable. In order to improve structural and odor features of waste. before sorting on the secondary materials. three weeks of air drying is advisable.