In the introduction the relevance of the topic is given, ecological and environmental justification economic feasibility of wastewater treatment of coke production from resinous substances are given. The purpose and tasks of the research are formulated, scientific novelty and practical value of the obtained results are given. The method of adhesion extraction of resinous substances from coke wastewater using natural bentonite clay in the native form is proposed and the economic feasibility of using bentonite as an adsorbent is substantiated. The physical and chemical properties of the bentonite clay and flocculant are given, also given the description of laboratory installations; presented methods of research and processing of experimental data from the coke wastewater treatment process from resinous substances. The scientific prerequisites for the intensification of the technology of purifying coke wastewater from resinous substances by bentonite clay in the native (natural) form with the addition of the cationic flocculant Extraflock P 70 have been developed. In the initial concentrations of resinous substances in range 50–400 mg/dm3 it has been scientifically substantiated the influence of temperature, pH, type and doses of clay and flocculant, intensity of stirring. Optimal dosages of bentonite clay (100 mg/dm3) and Extraflock P 70 (4 mg/dm3) were experimentally determined, the combination of which allowed to shorten the purification time to 1–4 min and bring the content of the pollutant in the treated wastewater to < 10 mg/dm3. Proposed the empirical equation which allows to calculate the concentration of resinous substances in purified water on the basis of initial content of the pollutant, the dose of bentonite clay and the dose of flocculant. Based on the experimental data, removal process of resinous substances by bentonite clay by the Freundlich`s and Aranovich`s equilibrium isotherms and energy parameters of the process are established, which testify to the physical character of sorption and formation of a polymolecular layer with sorbate. Experimentally shown that the rate of sorption by bentonite clay during first 250 sec is determined by the external diffusion mass transfer of the pollutant, which allowed using the dependence of the mass transfer coefficient β on the hydrodynamic flow regime to predict the intensity of the adhesion process under static conditions. Based on A.M. Koganovsky`s and N.A. Meshkova-Klymenko`s kinetic model, the coefficients of external mass transfer for natural and activated bentonite clay in the environment of real coke wastewater determined for the first time. The optimum hydrodynamic conditions of the purification process (Re = 9000–10000) are established, which provides the normative content of resinous substances in purified water ≤ 10 mg/dm3. Using sedimentation analysis, it has been found that during the cleaning of coke wastewater from resinous substances, the largest pollutant-containing aggregates of the dispersed phase with a diameter of 150 microns are formed at combined application of bentonite clay and Extraflock P 70, which also causes intense clarification of wastewater in 1-4 min. Using the method of IR spectroscopy, the presence of bentonite clay and polycyclic aromatic hydrocarbons in the composition of pollutant-containing aggregates has been proved, which confirmed the four-stage hypothetical mechanism of wastewater treatment with the combined use of sodium bentonite clay and Extraflock P 70. Thesis proposes an improved technological scheme for treatment coke wastewater, in which the method of adhesion-flocculating purification of wastewater from resinous substances using natural sodium bentonite clay and cation flocculant before the biological purification stage is implemented. The improved technology of physical-chemical treatment of sewage from resinous substances and associated contaminants ensures stable compliance with the normative content of the pollutant and eliminates the need for flotation stage. The developed scheme allows to prevent the environmental damage of 1,4 million UAH/year and involves the use of cleaning wastes as a commodity by-product. The developed treating method had successful industrial tested on UBHO PJSC "Dniprovsk Coke", which is confirmed by the relevant act. The thesis results are implemented in the educational process for the preparation of the first (bachelor) and second (master) levels of higher education in the specialty
161 – "Chemical technologies and engineering" of the Dniprovsk State Technical University. Keywords: wastewater treatment, resinous substances, bentonite clay, intensification, adhesion, coke production
