Abstract
Paper presents design process of the prototype line, dedicated for production of fertilizer pellets from digestate-ash mixture. For enrichment of the nutritional characteristics of the final product additives were also used, like urea, elemental sulphur or phosphorite, and special fungal strains from Trichoderma spieces. During this process raw material will be dried (raw digestated), mixed, granulated and packed in one technological line. Presented concept, shows that there is possible to produce high quality fertilizer, from waste materials derrived form Green energy production, what should be one of very interesting ways to develop digestate and ash from biomass combustion.
Highlights
IntroductionThe best examples of such technologies, are biomass combustion and biogas plants
Production of the renewable energy, leads in many cases to waste production
Biogas plants produces large quantities of solid digestate, which in case of fermentation of agricultural residues can be treated as valuable source of nutrients for plants
Summary
The best examples of such technologies, are biomass combustion and biogas plants. There is produced ash, which could be reclaimed as valuable fertilizer. Biogas plants produces large quantities of solid digestate, which in case of fermentation of agricultural residues can be treated as valuable source of nutrients for plants. In many cases such highly watered digestate is deposed directly to land fields, but this method has some important disadvantages. In many countries, there are limits concerning amount of digestate dropped on the field during year. The last one of the cons is profitability of the transportation of raw digestate, which in many cases is limited up to 15 km from the place of production [1]
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