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DIGESMART

EU - ECO Innovation project: DIGESMART
Although biogas production is efficient at reducing agricultural emissions by converting the biomass into electricity and thermal energy (cogeneration), or biomethane, its major weakness is that it produces a digestate with high a concentration of nutrients (N, P, K) and the volume is around 90-95% of what was fed into the digester. This means that large agricultural areas are required for the application of the fermentation residues (because of nitrates regulation), which often results in long transport routes.

The Detricon stripping and scrubbing process recovers the nutrient N in an energy efficient way, producing a bio based liquid fertilizer with 180 kg N per ton. Using the heat of the CHP (combined heat and power) of the biogas plant and the solar heat, the remaining N, P and K is concentrated in the DIGESMART concept. In the picture below, a mass balance is given of the pilot plant (Gistel, Belgium).

Following the linkĀ http://www.digesmart.eu/eng/index.html gives you more information about the project and its objectives.