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The results of studying the process of electrocoagulation processing of joint oil-emulsion and chromium-containing wastewaters, which are formed at metal-working enterprises, are presented. Objective: to optimize the process of electrochemical neutralization of a joint effluent stream containing emulsified oil products and hexavalent chromium ions, and to study the composition and structure of sludge. Data were obtained on the study of the properties and composition of the sludge formed during the electrical treatment of a joint effluent containing emulsified oil products and hexavalent chromium ions to develop a disposal technology using thermogravimetric and x-ray phase analyzes. The results of the research during the planning of the experiment made it possible to determine the optimal regimes by pH and contact time.

The use of technical oxygen instead of air in biological treatment plants can increase their oxidizing ability. Bioreactor-clarifier is a new technical device for tertiary wastewater treatment with the use of oxygen. The design, operation principle and research results of the bioreactor-clarifier for tertiary treatment of urban wastewater are given The use of bioreactors-clarifiers for tertiary treatment of urban wastewater using dissolved technical oxygen allows intensifying the process of biochemical oxidation of organic substances in a contact weighed load and increasing the efficiency of wastewater treatment by BOD and other components.

The relevance of this study is due to the problem’s solution of preventing negative impact on the environment during the industrial waste disposal, as well as insufficient high-performance technologies for the treatment of sewage sludge in Siberian severe climatic conditions. Experimental studies of the properties, composition and structure of oil-emulsion wastewater sludge using x-ray phase and thermogravimetric analysis showed that the natural sludge, characterized by high humidity and a high value of specific filtration resistance is in an amorphous state The results of experimental studies on the conditioning process of oil emulsion wastewater sludge by heat treatment using low temperatures in the natural climatic conditions of Siberia are obtained. They can be used to develop effective technologies for processing and utilizing precipitation, which allows solving the problems of reducing the industrial impact on the environment

This paper presents the results of experimental studies on the intensifi cation of dehydration of mixed sediments of oil emulsion and acid-base wastewater. The study of determining the optimal doses of coagulants POLYPACS-30 LF, POLYPACS-F, POLYPACS-PFS was carried out. The properties of mixed sediments were found. The results are shown using X-ray phase and thermogravimetric analyzes on the D8ADVANCE devices of the fi rm Bruker (Germany) in Cu-K2-radiation and NETZSCHSTA 449 F1 by determining the composition of precipitation. The composition of the slag was determined using X-ray fl uorescence analysis - X-ray phase and X-ray X-ray spectral analyzes. The X-ray patt erns were taken on an automated X-ray diff ractometric equipment from ShimadzuXRD-7000S (CuKα radiation). XRF was carried out using an information retrieval system of X-ray phase identifi cation of materials (IPS FI), combining qualitative and semi-quantitative (by the method of “corundum numbers”) analysis. For semi-quantitative XRD, the method of fundamental parameters was used (wave X-ray fl uorescence spectrometer of the ShimadzuXRF-1800 company). Obtained data on the study of the properties and composition of mixed precipitation can be for the development of technology utilization.