Unit comprises receiver (1) for dissolution of animal and aviary outflow to 3-5% concentration, device (2) for dispersion of carbon-containing components as e.g. vegetation residue, mixer (3) for preparation of substrate, chambers for acid (4), regressive acid (5), neutral (6), alkaline (7), and methane (8) fermentation containing abrasive granular immobilisation packing (9) and mixing devices (10). The substrate is prepared with the ratio of carbon:nitrogen:phosphorus equal to 100:5:1, and fermented in series of chambers (4-7) at 36-38 C in the presence of packing (9) and with mixing. The chamber for methane fermentation (8) is in the form of column with horizontal perforated partitions (11,12) which form blow sections (13) connected to pumps, and intermediate methane-producing sections (14) filled with immobilisation packing (15). The upper section is connected through condenser (16) to gas turbine (17) of electrical generator drive, and its exhaust through pump (18) to lower blow section. The lower methane section (19) is connected to first microfilter (20), and its biomass output to centrifugal disintegrator (21) in recirculation contour of methane chamber (8). The fermentation residue from microfilter (20) is input to biocultivator (22), which is in the form of column containing alternating blow (23) and cultivation (24) sections; the lower section (25) is connected to microfilter (26) for separation of aerobic microorganisms, and to disintegrator (27) in recirculation contour of biocultivator (22). The mass excess from disintegrator (27) is directed through heat-exchanger-steriliser (28) to reservoir (29) for protein-vitamin additive.    USE -   The unit is used in technology of ecological stabilisation of products of life-activity of animal and aviary breeding with production of methane and protein-vitamin additive. It is useful in concerns of agroindustrial complex.    ADVANTAGE -   The efficiency of operation of unit is increased. Utilisation of protein-vitamin additive reduces fodder requirement by 20-30%, and increases yield of eggs, milk, meat by 30-40%.