Electrodialysis (EDI) Systems

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Sternova

Michigan, USA

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Electrodialysis (EDI) systems use electricity and specialized membranes to separate ions in a variety of liquid solutions in a highly effective and chemical-free manner. The clever design of ion-exchange membranes is the foundation of EDI technology.
Regarding wastewater treatment, electrodialysis exhibits considerable promise in tackling a number of environmental issues:
Alkali Recovery from Papermaking Waste:

By effectively treating alkali papermaking waste liquid, EDI makes it possible to recover lignin from the diluted stream and recover valuable alkali from the concentrated stream for process reuse. This reduces waste and maximizes resource efficiency.
Concentration and Separation of Heavy Metal Ions:
One effective method for removing and concentrating heavy metal ions from industrial wastewater is electrodialysis. The environmental impact of heavy metal discharge can be lessened and a circular economy can be promoted by treating this concentrated stream further for safe disposal or, better yet, for the valuable recovery and recycling of the metals.
Separation of radioactive elements:
Safer management and possible volume reduction of hazardous waste are made possible by EDI's selective ion transport capabilities, which make it appropriate for the difficult task of separating radioactive elements from radioactive wastewater.
Production of Sodium Hydroxide and Sulfuric Acid from Glauberite Waste:
The waste liquid from glauberite can be processed using EDI, turning a waste stream into useful resources and allowing the production of useful industrial chemicals like sodium hydroxide and sulfuric acid.
Recovery of Sulfuric Acid and Elimination of Heavy Metals from Pickling Waste:
Sulfuric acid can be recovered from pickling waste liquid in metal finishing industries using EDI, which also removes and concentrates heavy metal ions, enabling resource recovery and the treatment of hazardous materials.
Treatment of Waste Liquid and Wastewater by Electroplating:
Electroplating wastewater and waste liquid, which frequently contain a complex mixture of metal ions like Cu2+, Zn2+, Cr(IV), and Ni2+, have been found to respond especially well to electrodialysis.
Its use in recovering nickel from nickel plating waste liquid is especially well-established; multiple factory implementations show that closed-loop circulation, water and chemical consumption reduction, and the recovery of valuable plating materials are all feasible. In summary, electrodialysis (EDI) systems are a flexible, effective, and eco-friendly ion separation technology that can be used in a variety of industrial and environmental settings. It is an essential tool for resource recovery, pollution control, and the development of sustainable industrial practices because it operates without the use of chemicals and can selectively separate and concentrate ions.

The network of dissociable ions and fixed functional groups that these membranes are designed with gives them an essential property:

Selective conductivity and permeability for particular ions in the solution. Numerous separation and purification applications in various industrial and environmental sectors are based on this inherent selectivity.
Electrodialysis, a crucial part of electrochemical processing, is well known for its adaptability.
Its uses include the precise desalting and concentration of different solutions in industrial processes, as well as the large-scale desalination of brackish and saltwater, which provides essential sources of drinkable water in arid and coastal regions.
The electrolytic preparation of inorganic compounds and the intricate process of recovering and purifying radioactive elements both depend on EDI, which requires a high degree of control and selectivity.
Furthermore, it offers an efficient and environmentally sound method for softening and desalting boiler water, crucial for preventing scale formation and ensuring the longevity of power generation equipment.
The processing of a wide variety of industrial products in industries like metallurgy, coal, electronics, medicine, the chemical industry, and food processing is one area where electrodialysis offers advantages.
Compared to conventional separation methods, which frequently rely on chemical additives and produce secondary waste streams, EDI is an appealing and sustainable option due to its inherent benefits, which include no chemical consumption, straightforward equipment design, and ease of operation.