The digestate evaporation system Vapogant processes the digestate from the biogas plant to such an extent that a usable, concentrated fertiliser with reduced water content is produced.
We remove a large part of the water from the digestate by vacuum evaporation using the waste heat from the CHP unit. At the same time, volatile nitrogen is bound so that losses during application are minimised and the nitrogen is available in the form of ammonium sulphate solution (ASS).
The aim is to use the available waste heat to thicken or refine 100% of the fermentation products produced in the biogas plant. This is achieved through a very high evaporation capacity of 2.5 litres per kW of thermal output. With a plant size of 500 kW thermal, this corresponds to a volume reduction of approx. 10,000 m³ per year. The plant is available in a module size of 400 kW or 500 kW.