Hibridación Termosolar Navarra, SL (HTN Biogás), has a high-capacity agro-industrial co-digestion plant in Navarra for the treatment and energy recovery of organic livestock and agro-industrial waste through anaerobic digestion.
HTN Biogas has relied on Aema (Water, Energy and Environment), a company specialized in water depuration, to carry out the construction of a Purification plant capable of separating the solid and liquid phase of the digestate at the minimum operating cost, according to the parameters required by the competent administrations. The objective is also to recover the nutrients as much as possible and convert the liquid digestate into regenerated water for reuse and reuse in irrigation, up to a flow of 1.000 m3/day.
The project consists of applying different technologies to transform wastewater and liquid digestate in regenerated water and in solid fraction, for fertilizer in crop fields or composting, through application of sustainable environmental technologies, which allow obtaining biogas and new fertilizer products for agricultural application.
The processes that the liquid digestate will go through are: physical-chemical treatment for the elimination of solids and fats, degassing of ammonia (stripping), biological treatment by activated sludge for the oxidation of organic matter and ultrafiltration using polymeric membranes to achieve a high quality effluent.
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