Importance

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Abstract

The invention relates to a method for processing biological substrate, comprising the steps of: a) introducing the biological substrate into an apparatus for dry fermentation, b) carrying out dry fermentation to recover methane, forming fermentation residue, c) transferring the fermentation residue obtained in step b) to an apparatus for solid-liquid separation, d) carrying out solid-liquid separation of the fermentation residue, forming a fermentation residue solid phase and a fermentation residue raw liquid phase, e) transferring the fermentation residue raw liquid phase obtained in step d) to an apparatus for separating solids, f) carrying out separation of solids from the fermentation residue raw liquid phase, recovering a fermentation residue liquid phase, g) introducing the fermentation residue liquid phase obtained in step f) into an apparatus for wet fermentation, h) carrying out wet fermentation to recover methane, forming liquid fermentation residue, i) returning at least some of the liquid fermentation residue formed in step h) as inoculum to the apparatus for dry fermentation.

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First Claim