Mixed bed demineralization (DM) produces high-purity water with extremely low conductivity (less than 1.0 µS/cm) by using a combination of cation and anion exchange resins to remove dissolved ions and minerals.
Here's a more detailed explanation:
What is Mixed Bed Demineralization?
Purpose:
Mixed bed demineralization is a water treatment process used to produce highly purified water with very low levels of dissolved solids and ions.
How it works:
It utilizes a combination of cation and anion exchange resins to remove dissolved ions from water.
Resins:
Cation exchange resins: remove positively charged ions (cations) like calcium, magnesium, and sodium.
Anion exchange resins: remove negatively charged ions (anions) like chloride, sulfate, and bicarbonate.
Water Quality:
The resulting water has a very low conductivity, typically less than 1.0 µS/cm, indicating high purity.
Why Use Mixed Bed Demineralization?
High Purity:
Mixed bed systems are designed to produce water with extremely low conductivity, making them suitable for applications requiring high purity water.
Applications:
Industrial Processes: Used in industries like power generation, pharmaceuticals, electronics, and chemical processing where high-purity water is essential.
Laboratory Applications: Used in laboratories for various experiments and procedures that require extremely pure water.
Boiler Water: Used to produce high-quality boiler water.
Key Features of Mixed Bed Systems:
Resin Mixing:
Cation and anion exchange resins are mixed together in a single vessel.
Ion Exchange:
As water flows through the resin bed, the ions in the water are exchanged for hydrogen and hydroxyl ions (H+ and OH-) on the resin beads.
Regeneration:
When the resin bed's capacity is exhausted, the resins need to be regenerated using acid and alkali solutions.
Sophisticated Design:
Mixed bed systems often require sophisticated designs and equipment to ensure efficient operation and high-quality water production.
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