METHOD FOR THE PREPARATION OF ORGANIC FERTILIZERS HAVING A HIGH NUTRIENT CONCENTRATION AND ARRANGEMENT FOR CARRYING OUT SAID METHOD

摘要

The invention relates to a method for preparing organic fertilizers having a high nutrient concentration by anaerobically pretreating (1) biogenic raw materials and/or waste products and then separating (3) the fermented residues (2) into a solid and a liquid phase recovering nutrients from the liquid phase (5) and feeding the nutrients to the solid phase (4) drying (6) the solid phase (4) and finally compacting (20) the dry matter. The invention also relates to an arrangement for carrying out said method wherein dissolved ammonium and dissolved hydrogen sulfide are removed from a liquid phase (5) in a desorber (7) the obtained gaseous nitrogen and sulfur compounds are dissolved in chilled sulfurous biological acid (9) in the downstream vapor scrubber (8) the scrubbing liquid (10) loaded with dissolved ammonium is discharged from the vapor scrubber (8) as a liquid nutrient concentrate (11) and is fed to the solid phase (4) from the solid liquid phase separation process (3) and the solid phase (4) of the fermented residues (2) is brought in contact with a hot air flow (12) in an evaporator (13).