Method for anaerobically fermenting biodegradable organic material, whereby
this material is mixed with a quantity of already fermented material as an inoculum
for the active anaerobic fermentation and this mixture is introduced at the top
into a fermentation chamber (1A) in which a fermenting mass is situated,
which, while being fermented, moves from an inlet (6A) situated at the top
towards an outlet (8) situated at the bottom. Before the mixture is added
to the fermenting mass, it is expanded beforehand until its density approximately
coincides with the density of the already present fermenting mass at the beginning
of this downward movement.
