NOVELTY - Recycling material and energy of biogenic residues of potato processing plants using waste materials in a wet fermentation, comprises e.g. concentrating total nutrient potential in the form of nitrogen, phosphorus, potassium and sulfur in a fertilizer fraction obtained from the fermentation residues, providing the desulfurized biogas for energy recovery, subjecting the produced bio-suspension to an aerobic hydrolysis, and utilizing the desulfurized, dried and compressed biogas for combined production of electrical and thermal energy process.    USE - The method and the assembly are useful recycling material and energy of biogenic residues of potato processing plants using waste materials in a wet fermentation (all claimed).    ADVANTAGE - The method and the assembly are environmentally friendly and economical.    DETAILED DESCRIPTION - Recycling material and energy of biogenic residues of potato processing plants through use of waste materials in a wet fermentation, comprises concentrating total nutrient potential in the form of nitrogen, phosphorus, potassium and sulfur in a fertilizer fraction obtained from the fermentation residues, providing the desulfurized biogas for energy recovery, utilizing the yeast fermentation for bioethanol production and/or the methane fermentation for biogas production as wet fermentation, recovering biogenic residues from the manufacturing process of starchy root crops e.g. potatoes, sweet potatoes, manioc, tapioca and cassava in the form of grain masses, starchy white waters, residues from the purification of the starting materials, dregs from the upstream ethanol distillation, aqueous media from the periodic system cleaning and/or sludges, adjusting a dry matter content of bio-suspension to 12-18% using additives with dry matter content of at least 25%, subjecting the produced bio-suspension to an aerobic hydrolysis, supplying hydrolyzate produced from the bio-suspension to an anaerobic digester system of at least one hydraulic and partially intermixed fermenter with initially inserted and constantly reproducing special culture, recovering potential of plant nutrients as a mixture of the solid phase of the fermentation residues contained in the recycled input materials and liquid washing media with high levels of ammonium and sulfur compounds, and utilizing the desulfurized, dried and compressed biogas for combined production of electrical and thermal energy process. An INDEPENDENT CLAIM is also included for an assembly for performing the above method, comprising at least one suspending station, a fermentation station for the methane fermentation, a phase separating station for the fermentation residue, a biofiltrate-storage tank, and a gas desulfurization station, where the suspending station is in communication with a storage- and dispensing system for dry matter rich additives. An inhibitor removing station is arranged between the biofiltrate storage tank and the suspending station. A gas scrubber is arranged as gas desulfurization station in the form of trickle-body apparatus. A bio-acid storage tank for storing the sulfurous bio-acid recovered in the gas desulfurization station is arranged between the gas desulfurization station and the inhibitor removing station and/or a hydrolysis station. The hydrolysis station is arranged between the suspending station and the fermentation station. The fermenter station comprises at least one main fermenter and at least one downstream fermenter.