NOVELTY - The method of microbiological purification of biogas arising during methane fermentation of settled organic matter in a fermentation container, based on the removal contaminants, particularly hydrogen sulfide, under anoxic conditions, in an installation containing a biofilter loaded with a biological filter bed sprinkled with a mineral medium, containing immobilized microorganisms capable of degrading hydrogen sulfide, is claimed. The biological filter bed is sprinkled with a medium in the form of a solution containing nitrogenous salts of alkali metals of I group and II group.    USE - The method is useful for microbiological purification of biogas arising during methane fermentation of settled organic matter in a fermentation container (claimed), where the biogas is useful for heating energy, electrical energy, heat and electricity generation in combined systems and vehicle fuel.    ADVANTAGE - The method is capable of economically eliminating 97-100% of contaminants including hydrogen sulfide, ammonia, carbon monoxide, organic substances and dust in the biogas with less energy consumption, minimizing sulfur production in the biogas purification and purifying the biogas without formation of residues, thus increasing calorific value of the biogas.    DETAILED DESCRIPTION - The method of microbiological purification of biogas arising during methane fermentation of settled organic matter in a fermentation container, based on the removal contaminants, particularly hydrogen sulfide, under anoxic conditions, in an installation containing a biofilter loaded with a biological filter bed sprinkled with a mineral medium, containing immobilized microorganisms capable of degrading hydrogen sulfide, is claimed. The biological filter bed is sprinkled with a medium in the form of a solution containing nitrogenous salts of alkali metals of I group and II group, where the concentration of nitrogen ions in the medium is 260-800 mg/l. The concentration of H2S loaded into the installation is 720 ppm. The medium flow volume intensity sprinkled onto the biological filter bed is 5-500 L/h per cubic meter of filter bed. The purification process is performed at temperature is 20-30 degrees C. The medium has a pH of 5.5-7.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a biogas purification installation.    Pipeline (3)    Temperature sensor (5)    Medium flow meter (9)    Sprinkler (10)    Flow regulator. (13)