The article presents the results of reagent purification of sewage from machine building industries from chromium (VI) ions. The relevance of research is connected with the expansion of the spectrum of effective reagents at the expense of the use of industrial wastes [1-3]. The component composition of abrasive waste formed from grinding of ferrous metals with a metal content of less than 50% is studied here. Conditions have been developed for the oxidation-reduction reactions necessary in the reagent purification of sewage from chromium (VI). It is shown that purification with an efficiency of more than 80% takes place within 60 minutes.

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Currently, the search for new methods of wastewater treatment is an urgent task. In this work, investigation was carried out on the treatment of sewage containing dyes using modified waste generated during the refining of oils. During the research, the influence of various physical and chemical factors on the efficiency of sewage containing dyes was investigated. As a result of investigation on model sewage, it was found that when using modified waste, the maximum cleaning efficiency reaches 98%. At the same time, the following environmental problems are being solved simultaneously: reducing the amount of man-made waste and, as a result, reducing the area for its storage and treatment of waste water containing dyes.

The results of sewage treatment from nickel ions are given in the article. The relevance of the studies is determined by the expansion of the spectrum of effective sorbents-reagents as a result of the use of industrial wastes. Mineralogical and component compositions of abrasive waste are studied. The process of sorption and desorption of nickel ions on the wastewas studied by theconstruction isotherm method and a mixed character of sorption processes with a predominance of physical interactions was established.

The relevance of the research is due to both problems arising from the pollution of surface water with oil products, and the possibility of expanding the range of effective sorbents through the use of industrial waste. The article presents the results on the selection of purification parameters for model effluents containing industrial oils as a type of oil product. Purification was carried out by a sorbent made on the basis of the waste formed during the purification of vegetable oils from waxy impurities. The sorbent was obtained as a result of roasting secondary silica-containing raw materials of oil extraction production in a certain temperature range. It was revealed that the heat treatment of the waste leads to a partial burnout of the organics and the preservation of the paraffin fractions that make up the waxy impurities. Due to this, thermally modified waste becomes hydrophobic and oleophilic; contributes to an increase in oil absorption. In the course of the study, the influence of a number of factors was established, such as the temperature of waste roasting, the duration of contact of the sorbent and the purified medium, the mass of the sorbent, on the efficiency of the process of purifying model solutions from oil products.