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By optimising usage of unused heat sources, narema GmbH's fermentation treatment changes your digestate into storable material that can be used for agriculture. This is possible by combining proven and new technologies in a registered for patent process.
Step 1:
By mechanically separating the digestate, a solid is obtained with an approx. 30% dry matter content. As a result, 10,000 t of digestate can be reduced to 500 t – 1,000 t of solid and then distributed as humus-forming fertiliser. The water extracted by adding the waste engine heat from CHPs (combined heat and power plants) contains ammonia (NH3).
Step 2:
The ammonia and water are expelled thermally from the separated, liquid phase. Storable ammonium sulphate ((NH4)2 SO4) and calcium carbonate (CaCO3) are created in a reaction cycle by adding a natural mineral and carbon dioxide (CO2) from the previously unused engine waste gas.
Step 3:
By heating during all reaction cycles, water out of condensate that can be used in agriculture, as well as a mineral-rich liquid are generated. This liquid contains remaining fertilising substances. Some of the key elements are: phosphor (P), magnesium (Mg), sulphur (S), potassium (K) and manganese (Mn). As a result, the liquid is suitable for producing and enriching the solid matter, for example in order to retain the required remaining moisture.