Towards a Full Circular Economy in Biogas Plants: Sustainable Management of Digestate for Growing Biomass Feedstocks and Use as Biofertilizer

The digestate is a prospective biofertilizer and potential source of income for many biogas plants worldwide. However, its actual impact on the soil properties biomass yield still unexploited. different digestates from eight agricultural were researched in terms their chemical composition fertilizing potential. results obtained analysis indicate that had large amount nitrogen (up to 73 g kg−1 fresh mass) potassium 25 mass). value was estimated range 2.88–7.89 EUR Mg−1 liquid 7.62–13.61 solid based commercial fertilizer market price nitrogen, phosphorus, organic carbon, Cu, Zn, Fe Mg. produced at 1 MW plant worth 941–2095 per day addition energy sales income. application low-fertility land areas close allows production up three-fold more suitable production. digestate’s semi-natural grass soils near could be an alternative strategy feedstock portfolio diversification.