NOVELTY - Continuous-flow anaerobic digester for methanization of organic matter and for production of fertilizer, which enhances the conditions and performance of the anaerobic digestion process, by homogenization of both the sludge and the temperature of the process, comprises a flexible polymer tube comprising a biogas discharge valve, sludge inlet and outlet connections, and a zipper which is water- and gas-tight and resistant to the corrosive elements of the digestion, the elements being housed in the middle portion of the ends of the digester.    USE - Continuous-flow anaerobic digester for methanization of organic matter and for production of fertilizer (claimed).    ADVANTAGE - The continuous-flow anaerobic digester allows for improving the digestion process.    DETAILED DESCRIPTION - Continuous-flow anaerobic digester for methanization of organic matter and for production of fertilizer, which enhances the conditions and performance of the anaerobic digestion process, by homogenization of both the sludge and the temperature of the process, comprises a flexible polymer tube comprising a biogas discharge valve, sludge inlet and outlet connections, and a zipper which is water- and gas-tight and resistant to the corrosive elements of the digestion, the elements being housed in the middle portion of the ends of the digester. The digester also includes a drain. The base of the digester comprises a gas irrigation system for biogas recirculation, consisting of modular gas diffusing circuits disposed as appropriate in each case, made from a polymer material resistant to corrosion from the elements produced by the anaerobic digestion. An INDEPENDENT CLAIM is included for a method for obtaining biogas into a bio-digester enhancing the conditions and performance of the anaerobic digestion process by homogenization of the sludge and the process temperature, involving providing a digester consisting of a ball flexible high polymer chemistry to stress, UV, abrasion resistance and other climatic conditions; depositing organic material mixed with water into the digester through a pipe connected to the inlet of sludge; controlling various parameters inside the digester; and retaining the gas generated by the digestion process into the reactor and recirculating part of it by the irrigation system of gas.