At the moment, complex and unified solutions have not been created, with the intensification of processes and control systems in accordance with integral resource-efficient criteria, which increases the urgency of the task of developing a technological basis for a specialized combined electrotechnological complex for water treatment. The aim of the research is to substantiate the structure and parameters of the combined electrotechnological processes of wastewater treatment in paper and cardboard production. When treating wastewater, electrocoagulation processes were used, characterized by the electrochemical dissolution of metal anodes. Also, during the processing, chemical coagulation was used, which is based on the addition of active coagulants to the wastewater: ammonium, copper, and iron salts. To accelerate the precipitation processes, after coagulation, a biocidal flocculant was used, after which the clarified solution was passed through a diaphragm electrolyzer with an inactive membrane. Also, wastewater was subjected to ozonation for the purpose of additional oxidation of pollutants. To mix the coagulant and effluents, we used an atmospheric air supply. After flotation coagulation, the wastewater was separated by sedimentation and filtered, if necessary, through a polystyrene foam filter. After evaluating the results of experimental wastewater treatment of paper and cardboard production, a combined scheme of an electrotechnological water treatment complex is proposed. Calculation of technical and economic indicators showed that the financial costs of processing glue and dye washes using a combined electrotechnical complex are almost six times less than the services of specialized companies for the disposal of such wastewater. Disposal of untreated aqueous solutions of paper and cardboard production without purification is unacceptable - from the point of view of their possible critical anthropogenic load on the environment in such cases.
Authors:   Polessky State University, Kozir A. ,   Polessky State University, Zaiets N. ,   The National University of Life and Environmental Sciences of Ukraine, Alekseevskiy D. ,   Zaporizhzhia National University
Published: April 2021

At the moment, complex and unified solutions have not been created, with the intensification of processes and control systems in accordance with integral resource-efficient criteria, which increases the urgency of the task of developing a technological basis for a specialized combined electrotechnological complex for water treatment. The aim of the research is to substantiate the structure and parameters of the combined electrotechnological processes of wastewater treatment in paper and cardboard production. When treating wastewater, electrocoagulation processes were used, characterized by the electrochemical dissolution of metal anodes. Also, during the processing, chemical coagulation was used, which is based on the addition of active coagulants to the wastewater: ammonium, copper, and iron salts. To accelerate the precipitation processes, after coagulation, a biocidal flocculant was used, after which the clarified solution was passed through a diaphragm electrolyzer with an inactive membrane. Also, wastewater was subjected to ozonation for the purpose of additional oxidation of pollutants. To mix the coagulant and effluents, we used an atmospheric air supply. After flotation coagulation, the wastewater was separated by sedimentation and filtered, if necessary, through a polystyrene foam filter. After evaluating the results of experimental wastewater treatment of paper and cardboard production, a combined scheme of an electrotechnological water treatment complex is proposed. Calculation of technical and economic indicators showed that the financial costs of processing glue and dye washes using a combined electrotechnical complex are almost six times less than the services of specialized companies for the disposal of such wastewater. Disposal of untreated aqueous solutions of paper and cardboard production without purification is unacceptable - from the point of view of their possible critical anthropogenic load on the environment in such cases.