Process and apparatus for bio-aeration of liquid when producing biogas

摘要

The invention relates to a method for biologically treating a fluid sufficiently charged with organic materials, the method being performed in a tank and the fluid being:first subjected to a mixing and acidifying step (A), subsequentlyin a heavy load step (B) during which activated-sludge is re-circulated and then in a light load step (C) subjected to anaerobic degradation whilst producing methane gas, and subsequentlytreated in a secondary sedimentation step (D) from where the sludge can also be re-circulated,and the biogas which is produced in the heavy load step (B) and the light load step (C) is collected.