NOVELTY - Methane fermentation comprises suspending organic raw materials and/or waste materials by aerobically hydrolyzing the obtained biosuspension to a fermentation substrate, carrying out multi-step secondary fermentation in an anaerobic fermenter system during partial degradation of the inserted organic substance present fermentation substrate into biogas and using waste fermentation residues as fertilizer substrate and/or suspending liquid. The anaerobic treatment of the fermentation substrate is carried out in at least two serially connected fermentation steps.    USE - The method is useful for methane fermentation.    ADVANTAGE - The method allows maximum energy and material recycling of biogenic raw materials and/or waste materials for producing bio-energy and organic fertilizers in a cost efficient manner with minimum processing time and minimum residual gas emission potential from the discharged fermentation residues.    DETAILED DESCRIPTION - Methane fermentation comprises suspending organic raw materials and/or waste materials by aerobically hydrolyzing the obtained biosuspension to a fermentation substrate, carrying out multi-step secondary fermentation in an anaerobic fermenter system during partial degradation of the inserted organic substance present fermentation substrate into biogas and using waste fermentation residues as fertilizer substrate and/or suspending liquid. The anaerobic treatment of the fermentation substrate is carried out in at least two serially connected fermentation steps with different operated fermentation apparatus in the individual fermentation steps. The anaerobic treatment of the fermentation substrate is carried out in the second fermentation step through the use of at least two completely mixed and filling and drainable fermentation containers during the treatment. The second fermentation step is carried out subsequent to the fermentation residue storage with a filling volume capacity of at least of fermentation container of the second fermentation step. The continuous or quasi-continuous flow of the fermentation substrate is transferred from the first fermentation step alternately in the fermentation container of the second fermentation step. The fermented fermentation substrate is transferred in batches from one or to the other fermentation container of the second fermentation step in the fermentation residue storage until the complete filling of the fermentation container of the second fermentation step, which receives the fermentation substrate from the first fermentation step. The fermentation container of the second fermentation step, which is filled with fermentation substrate from the first fermentation step, is anaerobically treated in a batchwise manner with subsequent fermentation substrate absorption for the required drainage An INDEPENDENT CLAIM is also included for an arrangement for carrying out the above mentioned method by successive interconnection of a suspension station (6), a hydrolysis station, a fermentation station, a fermentation residue storage and a fermentation residue treatment station, where (a) the fermentation station is sub-divided into at least two fermentation steps, which are operated with different cultures and different fermenter systems, and (b) a pump station for the batch rearrangement of the fermentation residue from the fermentation container of the second fermentation step in the fermentation residue storage is arranged between the second fermentation step and the fermentation residue storage.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic process flow of the method (Drawing includes non-English language text).