Bioreactor and use thereof, method for producing an organic nutrient solution, organic nutrient solution, substrate material and use thereof for cultivating plants

A bioreactor (1, 2, 3) for conversion of organic residual and/or waste materials into an organic nutrient solution with a proportion of at least 10% of plant-accessible mineralized nitrogen relative to a total nitrogen content of the nutrient solution, the bioreactor comprising:

• a reaction tank (5) having an input feed (6) through which suspension (4) is introducible into the reaction tank (5);
• and
• the reaction tank (5) has an output feed (7) through which the suspension (4) is dischargeable from the reaction tank (5);
• an aeration device (8) through which oxygen is introduced into the reaction tank (5) and the suspension (4) contained therein;
• a carrier element (10) with a settlement surface (11) configured for formation of a biofilm (12) of microorganisms positioned within a receiving chamber (9) inside the reaction tank (5);
• the carrier element (10) is at least one of flushable or rinseable with the previously introduced suspension (4) and oxygen;
• and
• the carrier element (10) has a surface-to-volume ratio that is greater than a surface-to-volume ratio of the receiving chamber (9).