Question:
In electrodialysis membranes, which type of current is used?
In electrodialysis membranes, which type of current is used?
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Electrodialysis is preferred over ion exchange for partial demineralization of whey because it is more cost-effective for large-scale industrial operations.
Updated On: Jul 23, 2026
- DC
- AC
- Static charges
- Sinusoidal
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Electrodialysis (ED) is a membrane process used for the demineralization (desalting) of dairy products like whey. It utilizes ion-selective membranes (cation and anion exchange membranes) and an electrical potential as the driving force.
Step 2: Detailed Explanation:
The principle of electrodialysis relies on the migration of charged ions towards oppositely charged electrodes.
- Cations (like $Na^{+}$, $Ca^{2+}$) move toward the cathode.
- Anions (like $Cl^{-}$, $PO_{4}^{3-}$) move toward the anode.
To maintain this unidirectional flow of ions through the selective membranes and effectively separate them from the milk solids (like lactose and protein), a Direct Current (DC) is essential. Alternating Current (AC) would cause the ions to vibrate back and forth rapidly without moving through the membranes in a specific direction. Static charges do not provide a continuous flow, and sinusoidal is a form of AC. Therefore, DC is the only current capable of driving the ion-migration process required for deashing whey.
Step 3: Final Answer:
In electrodialysis membranes, DC (Direct Current) is used.
Electrodialysis (ED) is a membrane process used for the demineralization (desalting) of dairy products like whey. It utilizes ion-selective membranes (cation and anion exchange membranes) and an electrical potential as the driving force.
Step 2: Detailed Explanation:
The principle of electrodialysis relies on the migration of charged ions towards oppositely charged electrodes.
- Cations (like $Na^{+}$, $Ca^{2+}$) move toward the cathode.
- Anions (like $Cl^{-}$, $PO_{4}^{3-}$) move toward the anode.
To maintain this unidirectional flow of ions through the selective membranes and effectively separate them from the milk solids (like lactose and protein), a Direct Current (DC) is essential. Alternating Current (AC) would cause the ions to vibrate back and forth rapidly without moving through the membranes in a specific direction. Static charges do not provide a continuous flow, and sinusoidal is a form of AC. Therefore, DC is the only current capable of driving the ion-migration process required for deashing whey.
Step 3: Final Answer:
In electrodialysis membranes, DC (Direct Current) is used.
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