Abstract: An anaerobic biogas plant for the digestion of fresh organic digestion substrate. The digester having an entry section with an inlet at a first end, a rear section at a second, opposite end, and a middle section arranged between the entry section and the rear section. The digester further includes a stirring unit comprising a shaft extending in the direction from the first end to the second end and having at least one agitating arm for mixing the substrate within the digester. The middle section of the digester includes a main outlet and the rear section includes an additional outlet. The digester further includes a separate return line leading from the additional outlet back to the entry section of the digester for allowing a direct return of a minor fraction of digested substrate removed from the rear section back into the entry section of the digester.

Abstract: A biogas plant fermenter supply method increases total throughput of substrate through fermenter chambers while not changing the number of fermenter chambers. An inoculum fermenter chamber is supplied with raw fermentation substrate and fermenting for a dwell time, returning part of the substrate fermented in the inoculum fermenter chamber in the form of a self-inoculating substrate to the inoculum fermenter chamber by a return path, the part being mixed with the raw fermentation substrate, and supplying a fast fermenter chamber coupled to the inoculum fermenter chamber with an additional part of the substrate fermented in the inoculum fermenter chamber in the form of a fast fermenter inoculation substrate and mixing the additional part with fast fermenter raw substrate of an amount per unit of time, wherein fermented output substrate is removed from the fast fermenter chamber after a dwell time of the substrate mixture introduced into the fast fermenter chamber.

Abstract: A process for the anaerobic fermentation of biogenic waste materials including the steps that a fermentation material containing the waste materials is mixed with liquid and the fermentation material suspension obtained in this manner is anaerobically fermented in a fermenter and the digest produced in the fermentation of the fermentation material suspension is dewatered of a dewatering device, wherein, with separation of press water, a press cake is obtained that has a dry matter proportion increased with respect to the digest; the press water is subjected to a solids separation, wherein a residual liquid having a dry matter proportion reduced with respect to the press water of at most 15% by weight is obtained and the residual liquid is used at least in part for the mixing according to the fermentation material step.

Abstract: A process for the anaerobic fermentation of biogenic waste materials including the steps that a fermentation material containing the waste materials is mixed with liquid and the fermentation material suspension obtained in this manner is anaerobically fermented in a fermenter and the digest produced in the fermentation of the fermentation material suspension is dewatered of a dewatering device, wherein, with separation of press water, a press cake is obtained that has a dry matter proportion increased with respect to the digest; the press water is subjected to a solids separation, wherein a residual liquid having a dry matter proportion reduced with respect to the press water of at most 15% by weight is obtained and the residual liquid is used at least in part for the mixing according to the fermentation material step.

Abstract: A biogas plant fermenter supply method increases total throughput of substrate through fermenter chambers while not changing the number of fermenter chambers. An inoculum fermenter chamber is supplied with raw fermentation substrate and fermenting for a dwell time, returning part of the substrate fermented in the inoculum fermenter chamber in the form of a self-inoculating substrate to the inoculum fermenter chamber by a return path, the part being mixed with the raw fermentation substrate, and supplying a fast fermenter chamber coupled to the inoculum fermenter chamber with an additional part of the substrate fermented in the inoculum fermenter chamber in the form of a fast fermenter inoculation substrate and mixing the additional part with fast fermenter raw substrate of an amount per unit of time, wherein fermented output substrate is removed from the fast fermenter chamber after a dwell time of the substrate mixture introduced into the fast fermenter chamber.