Abstract: Disclosed are a method for the anaerobic treatment of pulp-containing waste and a fermentation plant for such products, wherein they are first of all mechanically prepared and comminuted, subsequently diluted to a predetermined dry matter content by the addition of process water or the like, and sanitized and anaerobically fermented in a subsequent method step. The remaining rotted residue is divided into a plastics-rich and a pulp-rich fraction, and these fractions are conditioned in conditioning stages to recyclable materials, or to fuel, or to products adapted to be deposited.