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▶ Overview of EDI
EDI is the cutting-edge demineralization system. It is devoid of chemical regeneration that is used for Mixed Bed Deionization (MBD) and is a continuously-operating demineralization system and ion exchange membrane unit that adopted Ion Exchange Membrane.

▶ EDI mechanism
- A cation exchange membrane has anion active agents, so it selectively lets positive ions pass through.
- An anion exchange membrane has cation active agents, so it electrostatically lets anions move through.
- Inflowing water is distributed to EDI cells.
- When the direct current electricity is supplied, cations in the water go through the cation exchange membrane toward the negative electrode while anions pass through the anion exchange membrane toward the cation electrode.
- Demineralized water is produced in the diluting chamber with the ions eliminated while ion-enriched chamber produces or circulates enriched water.

▶ EDI Flow Chart


1) Continuous production of demineralized water with constant quality
EDI does not regenerate chemical agents unlike MBD (MIXED BED DEIONIZER), so it continuously produces demineralized water and seldom changes quality.

2) Reduced operation cost
The production cost is very low because it consumes direct current power. Chemical cost is not required because it does not regenerate chemicals.

3) TOC Removal
EDI can eliminate over 90% of TOC.

4) SILICA Removal
EDI can eliminate over 90% of dissolved silica without adjusting pH.

5) No need for chemicals
It does not need chemicals. Therefore, operators do not have any risk to be exposed to chemicals and facilities do not corrode.

6) Minimum installation space
It does not need any additional space for facilities used for chemical regeneration.

7) Easy maintenance and installation
No need for human labor for chemical regeneration. All you need to do is to connect Input and output pipes.


▶ Applications
　　- Demineralization facilities of power plant
　- Ultra pure water systems of semiconductor plant
　- Ultra pure water systems for medical purpose
　- Demineralized water systems of chemical plant
　- Other processes required demineralized water

▶ DI SYSTEM Trends


▶ Change in water quality depending on feed water quality


▶ Electric resistance of EDI processed water using feed water from 1st R/O (Demineralized water)


▶TOC of EDI processed water using feed water from 2nd R/O (Demineralized water) (Ultra pure water)


▶Electric resistance of EDI processed water using feed water from 2nd R/O (Ultra pure water)


▶ Standard specification
Item/Product KE-1003 KE-1005 KE-1006 KE-1010
PRODUCT FLOW RATE 3㎥/Hr 5㎥/Hr 6㎥/Hr 10㎥/Hr
PRODUCT RECOVERY 80 ~ 95% 80 ~ 95% 80 ~ 95% 80 ~ 95%
PORDUCT RESISTIVITY 15~18㏁-㎝ 15~18㏁-㎝ 15~18㏁-㎝ 15~18㏁-㎝
Elimination of over 90% of TOC 90% 이상 90% 이상 90% 이상 90% 이상
Elimination of over 90% of SIO2 90% 이상 90% 이상 90% 이상 90% 이상
PRESSURE DROP 1.5~2.0㎏/㎠ 1.5~2.0㎏/㎠ 1.5~2.0㎏/㎠ 1.5~2.0㎏/㎠
POWER 0.8KW 1.2KW 1.6KW 2.4KW
WIDTH (INCH) 1200mm (47.24) 1300mm (51.18) 1300mm (51.18) 1500mm (59.06)
EDPTH (INCH) 1800mm (70.87) 2000mm (78.74) 2500mm (98.43) 3500mm (137.80)
HEIGHT (INCH) 2000mm (78.74) 2000mm (78.74) 2000mm (78.74) 2000mm (78.74)
OPERATING WEIGHT 1,500kg 1,800kg 2,000kg 2,700kg


▶ Quality conditions of feed water
Conditions/Item FEED WATER
EQUIVALENT CONDUCTIVITY Less than 50㎲/㎝
T-HARDNESS Less than 1.0 ppm
FREE CHLORINE Less than 0.5 ppm
Fe, Mn, H2S Less than 0.01 ppm