ADSORPTION PURIFICATION OF LIQUID WASTE FROM PHOSPHATES AND RESINOUS SUBSTANCES USING NATURAL ADSORBENT BASED ON SUNFLOWER BEADS

Abstract

Among the physicochemical methods of deep extraction of pollutants from wastewater, adsorption is of great interest. Prospects for the use of sorbents from natural raw materials in wastewater treatment technologies based on a critical analysis of the technical literature are shown, the choice of research direction is substantiated. The use of natural adsorbent based on sunflower husk in the technology of wastewater treatment from phosphates and resinous substances at high content to minimize their anthropogenic impact on the environment is scientifically substantiated. The kinetics of adsorption of phosphates and resinous substances has been studied, the optimal parameters of adsorption purification have been established, and adsorption isotherms have been obtained. The theory of monomolecular adsorption (Langmuir and Freundlich equations) was used to characterize the sorbent based on sunflower husk and calculate the adsorption parameters. Experimental data on the degree of extraction of phosphates and resinous substances from wastewater using a natural adsorbent based on sunflower husk were obtained, and its specific surface area (200.06 m2/g) was experimentally determined. It was found that the highest efficiency of phosphate removal at the initial content of 21.25 mg/dm3 to 8.75 mg/dm3 from municipal liquid waste is achieved by adding an adsorbent in the amount of 10 g/dm3. With such technological parameters, the degree of waste treatment reaches 59.3%. At the increased concentration of resinous substances of 775 mg/dm3 at a dose of adsorbent of 1.5 g/dm3 duration of adsorption of 40 minutes their maintenance decreased to an extremely safe indicator (less than 25 mg/dm3). and implement them in urban and industrial treatment plants.