NOVELTY - Procedure for the treatment of substrates, to produce biogas, comprises: processing organic substances with water and degraded fermentation substrate or waste water, to obtain a suspension; feeding the suspension into a process area (4) of the first- and second step of a cascaded biogas reactor; subjecting the substances and microorganisms to an anaerobic procedure in the mesophilic or the thermophilic temperature area and to an electrodynamic process; and circulating and mixing the fermentation substrate in the core- and annular space of the biogas reactor according to the loop principle.    USE - The process is useful for the anaerobic and electrodynamic treatment of substrates using the cascaded biogas reactors, for the production of biogas.    ADVANTAGE - The biogas formed in the first step of the fermenter is led back to the second step in order to completely convert the produced gases hydrogen and carbon dioxide to methane gas. The efficiency of the biogas reactor is increased by the formed hydrogen by the electrical voltage. The increased growth rate and decreased mortality of microorganisms is achieved by the treatment with constant or pulsed electric and magnetic fields. The formation of hydrogen sulfide is prevented by the effect of constant or pulsed electric and magnetic fields in the process area.    DETAILED DESCRIPTION - Procedure for the treatment of substrates, to produce biogas, comprises: processing organic substances crushed by a corresponding aggregate, in a container having mixing tools under the addition of water and degraded fermentation substrate or waste water, to obtain a suspension; feeding the suspension into a process area (4) of the first step of a cascaded biogas reactor; feeding the suspension into a process area of the second step; feeding the substances and microorganisms to an anaerobic procedure in the mesophilic or in the thermophilic temperature area and to an electrodynamic process with constant or pulsating electric and magnetic fields; and circulating and mixing the fermentation substrate in the core- and annular space of the biogas reactor in a two-phase flow in the upflow and outflow through the forcing of biogas according to the loop principle.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a completely mixed biogas reactor.    Process area (4)    Heat exchanger (15)    Mixing container (44)    Lift pumps (50)    Permanent magnets (63, 65)