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The composition of the organic and mineral parts of solid residues from the production of humic preparations Hydrohumate, Oxyhumate, peat oxidate and Consil was studied. Significant differences in the component composition of these wastes, depending on the technologies for obtaining drugs, have been established. Redox-hydrolytic processing of peat leads to almost complete (acid-base hydrolysis) or partial (oxidation) destruction of hemicelluloses and the relative accumulation of cellulose and "lignin" in solid waste. The organic parts of the residues contain up to 30 % humic substances, due to the fact that the technologies for the production of humic preparations do not provide for the stage of washing the residues after separation in a centrifuge and some of the humic preparations remain in the solid phase. It is shown that the mineral part of solid residues includes a wide range of biogenic macro-and microelements, since humates of monovalent metals pass into solution, and salts of humic substances with metals of higher valence are insoluble and remain in the solid residue from hydrolysis or oxidation of peat. The study of the chemical composition of solid residues from the production of humic preparations showed possible directions for their effective disposal. Waste products are humate-containing products with a wide range of biogenic macro-and microelements, so they can be effectively used as biologically active additives to soils, compost, fertilizers, as well as in pond fish farming to stimulate the development of components of the natural food base of fish and increase the fish productivity of reservoirs.

The article presents the results of testing of solid wastes generated during liquid humic preparations production as biologically active additives in fish ponds. The tests were carried out in 2019 season in the nursery ponds of the SPU “Isobelino” and in the feeding ponds of the KhRU “Vileika” control of pond water in reservoirs showed that the introduction of humate-containing additives into fish ponds does not violate the hydrochemical regime of their functioning, all indicators are within the normative limits. As a result of the study of the aquatic biota, more efficient development of phyto- and zooplankton was revealed, as well as an increase in fish productivity, both in feeding and nursery ponds compared to the control ones. A production check carried out at OJSC "Beloye" Experimental fish farm" of Gomel region in 2020 showed that the use of humate-containing wastes of humic production makes it possible to achieve higher fish productivity in comparison to the traditional scheme of intensification measures, with 50 % savings of applied organic fertilizers, 25 % savings in ammophos and 100 % savings in ammonium nitrate. The increase in fish productivity is 6‒7 %.