*approx. HP Pump Pressure: 16 kg/cm 2 ,
water temperature: 22 0 C; TFC membrane elements 4"&8"x40";
membrane salt rejection 99-99.5%.
ELECTRODEIONIZATION (EDI) SYSTEMS
The EDI process combines two well-established water purification
technologies-electrodialysis (ED) and ion-exchange resin deionization.
Through this process dissolved salts can be removed with low
energy cost and without the need for chemical regeneration.
The EDI process normally replaces conventional mixed-bed resin
deionizers. The EDI process removes ions from water by forcing
them out of the feed stream into an adjacent stream via an electric
potential. EDI is different from ED. By using resins in the
diluting chambers, the resins allow for more efficient migration
of ions in very low conductivity water. The resins operate in
a continuous state by acting not as an ion-storage medium but
as an ion conduit. Ideally feed water to EDI is RO permeate
having a conductivity ranging from 4-30 microsiemens/cm (preferably
4-10). The following feed parameters are also to be adhered
to:
• pH: 5.0 to 9.5 (preferably pH 7.0-8.0).
• Temperature: 5 0 C to 35 0
C. Optimum quality at 25 0 C
• Inlet pressure: 4 bar (60 psi) - maximum
• Outlet Pressure: Concentrate and electrolyte
outlet pressures to be lower
than the product outlet pressure
• Hardness (as CaCO3): Maximum
1.0 ppm. Recommended 0.1 ppm
• Organics: Maximum 0.5 ppm TOC. Recommended
not detectable
• Oxidizers: Maximum 0.05 ppm (Cl 2
). Recommended not detectable Maximum 0.02 ppm (O 3
). Recommended not detectable
• Metals: Maximum 0.01 ppm Fe, Mn, transition
metals
• Total CO2 : Recommended less
than 5 ppm
| PACT Industrial Electrodeionization
Modules |
Model
No. |
Flow
Range
(m3 /h) |
Flow
Range
(gpm) |
Operating
Voltage (VDC) |
Depth
(mm)
Width 213mm
Height 559mm |
Depth
(inch)
Width 8 3/8"
Height 22" |
PED-100
|
50-150
l/h |
0.25-0.75
|
30-80
|
15 |
6 |
PED-200
|
100-300
l/h |
0.5-1.5
|
60-120
|
18 |
7 |
PED-300
|
300-900
l/h |
1.5-4.0
|
100-160
|
23 |
9 |
PED-400
|
0.7-1.5
|
3.0-7.0
|
150-250
|
28 |
11 |
PED-500
|
1.3-2.3
|
6.0-10.0
|
200-350
|
36 |
14 |
|
* The individual
modules shown above are normally stacked together on a separate
skid or next to reverse osmosis elements on the same skid. System
capacities go up to 125 (m3 /h) as standard and larger
for custom designed systems by stacking multiples of the modules
shown in the table. |
