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1. Electrodialysis
Electrodialysis is an electrochemical separation process. Under the effect of electrical fields, it uses permselectivity of ion-exchange membrane, so that the solution ion can be transferred to another part of water through the ion exchange membrane.

 

Electrodialysis is like a flat ion exchange. Electrodialysis removes ionized components and retains other non-ionized components. It is important that the components retained are usually valuable products to customers.

2. Differences Between Electrodialysis and Ion Exchange
1)
Electrodialysis does not need chemical regeneration like ion exchange.
2)The consumption of chemical reagents is limited to a small number of CIP cleaning.
3)Reduce wastewater discharge
4)Electrodialysis can operate accurately through the set conductivity. There is no unnecessary energy waste and no mixing.

 

3. Electrodialysis Principle

 


 

1)
The ion exchange membrane is the key to the electrodialysis process. It is a polymer electrolyte having reactive groups. The membrane is durable, resists organic pollution, stablechlorine , low resistance or high conductivity >90% efficiency, and a long service life.
2)Each membrane stack is composed by a membrane and a separator. The separator provides a compartment between membranes, to facilitate water flow between the membranes. The fluid flows across the membrane surface while the ions penetrate across the membrane.
3)All electrodialysis products are equipped with electrodes with super long service life. The electrodes take titanium as the substrate, coated with precious metals and platinum on the surface. Both ends of the membrane stack use the same electrodes. When steering, the electrodes can be interchangeable between the anode and cathode electrodes.
4)The membrane stack can accommodate 300 membrane units. Each membrane unit comprises an anion exchange membrane, a salt concentrate separator, cation exchange membrane, desalted product separator

 

4. Applications of Electrodialysis
1)
Food and Beverage: desalination and concentration of whey; removal of ash content in lactose, lactulose and galactose solution; removal of ash content in sugar solution (glucose, high fructose corn syrup, liquid sugar, etc.); desalination of soy sauce and other flavoring agents; pH adjustment and tartaric acid removal of drinks, fruit juices and wine.
2)Biopharmaceuticals: desalination of drug solution; organic acids, glucose acids, ascorbic acids, lactic acids, etc. Purification of amino acids; concentration of organic salts
3)Other fields: removal of formate in pentaerythritol; glycol desalination; sugar and salt recycling in cherry  effluent brine; ammonium nitrate concentration; glycerin desalination; acid and alkali recovery