Energy-efficient integrated treatment of industrial wastewater

Abstract

Recently, a major attention is paid to development of energy-efficient process integrated industrial wastewater treatment, that ensures due purification for organisation of recycling water supply and further utilisation of the treatment-generated waste. In this connection, the paper presents an advanced ferritisation process that allows to reduce initial concentrations of nickel ions in exhausted nickel electroplating electrolytes from 100 g/l to 0.3 mg/l. Effects of main technological parameters of such wastewater treatment at various methods of activation of the ferritisation process were determined experimentally.Developed experimental setup ferrite reactor. The installation involves the use of electromagnetic impulse discharges to intensify the process of wastewater treatment from heavy metal ions by the ferritization method. Economic feasibility of application of the electromagnetic pulse method for solution activations in the range of generated frequencies up to 0.9 kHz is shown.Integrated studies of the composition and physical properties for obtained sediments after wastewater treatment were carried out. The comparative analysis of sediment volumes obtained in the processes of industrial waste water purification with different methods and seals parameters is carried out. Phase compositions and properties of sediments from wastewater treated by the ferritisation method were studied. The sediments are predominantly characterised by crystalline structures, ferromagnetic properties and chemical stability, supporting opportunities for their environmentally sound utilisation, and allowing to avoid losses of nickel - a valuable but at the same time a toxic metal. In contrast to traditional reagent-based wastewater treatment methods, we propose a comprehensive process for treatment of liquid and industrial waste flows with introduction of a recycling cycle of water supply, that would prevent environmental contamination by toxic effluents, ensure efficient and rational use of water, raw materials and energy inputs in the system of electroplating production.