C. L. S. dos Santos, M. S. Rodrigues, F. S. Moreira, V. L. Cardoso, M. M. de Resende
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引用次数: 0
Abstract
Electrodialysis (ED) is a versatile technology that can be used to treat acidic effluents containing metal species. Its ability to operate continuously, scale up, and relatively straightforward operation can solve most of the drawbacks of current technologies. Direct reuse of flow rates from metal-concentrated outlets can avoid the need for chemical addition and precipitation. Consequently, ED emerges as a technology with enormous growth potential to concentrate, separate and selectively recover metals from acidic effluents. The study investigated the ED use for the removal of Fe2 + , Mn2 + , and Zn2 + ions from a synthetic effluent. The experimental results revealed the influence of the diluted solution composition on the limit current density values. The affinity of ion exchange membranes towards specific ions was determined, with Mn2 + showing the highest affinity and preferential retention. The efficiency of the process was affected by scaling on the membranes, particularly in the presence of Fe2 + . Cleaning with 10% HNO3 was found to be more effective in removing ions from the membranes. The experiments consistently achieved high percentages of ionic removal (> 99%) and demineralization rates (> 95%), demonstrating the efficiency of electrodialysis. The migration of ions towards the concentrated solution was observed over time, while minimal passage to the electrolyte occurred. Overall, electrodialysis exhibited promising potential for the treatment of metal-contaminated effluents, providing effective demineralization and high percentages of ionic removal.
期刊介绍：
International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management.
A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made.
The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.
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