NOVELTY - Cleaning a fraction of manure drain and effluent of Housing and Public Utilities using methane fermentation involves cavitation processing of effluent, its dilution with industrial water and enrichment with mixed-ligand complex compounds of biogenic metals, conducting methane fermentation of effluent in an aerobic bioreactor, where the intensity of fermentation process and depth of fermenting of the fermented substrate are increased, which leads to increase in the output of biogas with content of methane greater than 75% and to stabilization of fermentation process.    USE - For cleaning a fraction of manure drain and effluent of Housing and Public Utilities using methane fermentation (claimed).    DETAILED DESCRIPTION - Cleaning a fraction of manure drain and effluent of Housing and Public Utilities using methane fermentation, conducted by biocenosis of anaerobic bacteria involves: cavitation processing of effluent, its dilution with industrial water and enrichment with great doses of mixed-ligand complex compounds of biogenic metals, conducting methane fermentation of effluent, contaminated organic matter, with subsequent processing of water in aerobic bioreactor comprising aerobic active silt, after which the purified water is subjected to UV processing and directed to recirculation, where the intensity of fermentation process and the depth of fermenting of the fermented substrate are increased, which leads to increase in the output of biogas with the content of methane greater than 75% and to stabilization of fermentation process. The time of switching of anaerobic bioreactor to design mode with its primary activation or after the extended stop of fermentation process is decreased and clean organic fertilizer is obtained, which serves as a catalyst for increasing plant growth and as a recultivator of soils. Circulating water supply is obtained with the possibility of obtaining physiologically sufficient drinking water. Increasing the physiological activity of biocenosis of anaerobic bacteria, cultivating in anaerobic bioreactor, that leads to increased fertility of biocenosis of anaerobic bacteria to 10-15%, that have increased to 25-60% level of catalyst action, is accomplished by its partially filling with separately manufactured structured biologically active water, which contains water-soluble formates of biogenic metals, its subsequent dilution 10-30 times with cavitationally treated liquid fraction of manure drain. The formed solution is enriched with a mixture of biologically active materials, formed by coordinative or covalent bonds; thus obtained up to 78% reduction of concentration of organic pollutants in liquid fraction of manure drain and further by filtration through biological filter, filled with a mixture of filtering elements, which include the spent powder of clay of medical purpose and crushed stone of shungite, catalyzing the decomposition of residue of dissolved organic matter and specific gases of manure as well as compounds, which form emission of liquid fraction of manure. Further the filter with settled solid particles is directed into slime collector, where settling is removed and directed for preparation of organic fertilizer, and filtering elements are further supplied for cleaning of drain and the industrial water, which passed through filter, and is used in recirculation or for obtaining physiologically sufficient drinking water and giving the medicinal properties of various types to it by filtration through shungite crushed stone. The reduction of chemical oxygen demand (COD) of liquid fraction of manure drain only in anaerobic reactor to 78% of initial value makes it possible to remove from the aerobic process, which takes place with use of aerobic active silt, placed in aerobic bioreactor, and to replace it with a filter, filled with a mixture of filter elements.