ArticleThe aim of the work was to determine the physical properties of digestate from biogas
production - either with or without the addition of calcium carbonate and to determine the
parameters of its compaction. The material for research was obtained from an agricultural biogas
plant specialized in processing cattle manure, vegetable pomace, chicken manure and maize
silage. The parameters of compaction of digestate were experimentally determined and its net
calorific value was calculated based on the gross calorific value. Physical properties were
determined according to standards. The moisture content of liquid digestate was 96%. Mechanical
separation allowed to decrease the water content by 19% and addition of 20% of calcium
carbonate by 30%. It was found that digestate with addition of calcium carbonate is not suitable
to use for energy purposes, because of its low net calorific value (5.2–5.9 MJ kg-1), however it
can be used for fertilizer purposes in relation to its chemical composition. Without additives, the
net calorific value was 14.9 MJ kg-1
, but due to the high moisture content of the raw material it is
unprofitable to dry it and burn. On the other hand, it was proved that it is possible to obtain pellets
of appropriate density out of the digestate using 40 mm of the die height and 0.3 g of single
portion of the material
