Combined Technology for Tanneries Wastewater Processing

Abstract

Purpose. Substantiation and creation of the combined technology of wastewater of tanneries, which differ in the multicomponent pollutants. The introduction of the developed technology will improve the environmental safety of such industrial facilities by complying with the requirements of technical regulation of facilities for the removal of contaminants. Methodology. Combined tanneries wastewater treatment technology involves a combination of physico-chemical and chemical methods of treatment, electrical technology, electrochemical and biochemical processes. Optimization of the parameters of the developed technology was carried out with the use of gradient methods of analysis of multicomponent systems. Results. Developed a combined tanneries wastewater treatment technology, which includes two technological stages: electrochemical oxidation and coagulation and flocculation, intensified by electrolysis processes and cavitation. The conducted study confirmed efficiency of the offered tanneries wastewater treatment technology. The following reductions in the content of pollutants in effluents were achieved, %: sulfides – 77,38, hydrogen sulfide – 99,15, chromium – 99,84, COD – 91,19, chlorides – 10,98, phosphates – 62,22. Scientific novelty. For the first time by physical modeling of combined wastewater treatment from a leather plant based on the use as key electrolysis processes for the destruction of organic pollutants and reagent-free pH correction, a basis for the study of industrial wastewater treatment systems was created. This made it possible to combine in one technological solution different methods of removing pollutants from wastewater. Practical significance. Created technological schemes and developed modes of combined tanneries wastewater treatment technology, a combined water treatment module has been proposed. Calculated electricity consumption with the possibility of scaling according to the actual volume of drainage at industrial facilities.