Kolegova A. A. Low-waste environmentally-safe technologies for wastewater treatment from heavy metal ions

The dissertation is devoted to the development and improvement of the complex low-waste technology of wastewater purification from heavy metal ions by means of ion-exchange and electrochemical methods to increase the environmental safety of production technological processes at enterprises. Chapter 1 considers the main sources of formation and discharge of heavy metal ions into the environment. The advantages and disadvantages of choosing wastewater treatment methods were analyzed. Among the main perspektiv methods of wastewater treatment from heavy metal ions are sorption methods, which include ion exchanger removal and methods of electrochemical treatment of solutions. Chapter 2 presents the main characteristics of objects and research methods, considers the physicochemical properties of KU-2-8 ion exchange resin and MA-41 monopolar membrane brand. Chapter 3 shows the results of ion exchanger method for heavy metal ions removal from model solutions using KU-2-8 cation exchange resin in acid and salt forms. In the chapter 4 the processes of electroextraction of copper, cadmium, zinc and nickel ions, as well as their mixtures were studied. The work presented complex technological process diagrams for wastewater treatment contaminated with heavy metals, namely copper, zinc, nickel and cadmium. Key words: ion exchange, ion exchange resins, electrolysis, heavy metal ions, regeneration solution, membrane, sorption.