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					           Electrodeionisation (CEDI)
             e      i      i      D
Continuous Electrodeionisation (CEDI)

Continuous Electrodeionisation (CEDI) is a technology combining ion exchange
resins and ion-selective membranes with direct current to remove ionised species
from water. It overcomes the limitations of ion exchange resin beds, notably the
release of ions as the beds exhaust and the associated need to change or
regenerate the resins. Reverse osmosis (and sometimes membrane degassing) is
typically used prior to CEDI to ensure that the CEDI stack is not overloaded with high
levels of salts.

Applications include:
 High pressure boiler feed

 Humidification systems
 Central laboratory
Continuous Electrodeionisation

MPowerTM continuous                Features & Benefits                         Applications
electrodeionisation systems         Chemical free operation, no rege-          Industrial process water
                                    neration downtime; continuous              Power
polish reverse osmosis permeate     flow, consistent water quality
or condensate to produce high                                                  High pressure boiler feed
                                    Skid-mounted standardized
purity water of up to 18 M .cm.     systems; short lead-times,                 Electronics
                                    quick installation and start-up            Glass
Flow rates from 10 to 100 m3/hr.    Up to 8 CEDI modules per skid;             Food and beverage
                                    flexibility, high flow rates                 HPI/CPI
                                    Total safety through automated
                                    pressure and flow interlocks
                                                                              Related Services
                                    MMI touch screen; facilitates
                                    system operation, monitoring              Pre and post Mpower™ application
                                    and control, user-friendly                design, engineering and equipment.
                                    Automatic monitoring of conducti-         Local after-sales service and
                                    vity (feed and product) and change        support teams offer preventative
                                    in pressure across each module            maintenance programs to ensure
                                                                              the long-term, efficient operation
                                   CEDI Modules                               of installed plant.
                                    Double o-ring seal; leak-free operation
                                    Completely filled concentrating            Hydrex® Chemicals
                                    compartments; no need for recircu-        Hydrex® 5000 water treatment
                                    lation pump and brine injection           chemicals from Veolia Water
                                    Plate-and-frame arrangement gives         Solutions & Technologies should be
                                    even distribution of fluid and             used for optimized plant operation.
                                    current flow; improves performance
                                    and module life
                                    Wireless remote monitoring
                                    DCS and printer connectivity
                                    Stainless steel skid and control
                                    Flow transmitters

Performance & Dimensions
                                                                   Flow Rate at 25°C                                                                         Connections
 Model                                                                                                         No of Modules       Dimensions WxDxH
                                                            Min                          Max                                                             Feed, Product & Reject
                                                           m3/hr                        m3/hr                                              m                         DN
 I                                                          8.0                         12.5                         1                1.3 x 1.7 x 2.1             50, 50, 15
 II                                                         16.0                        25.0                         2               1.3 x 1.7 x 2.1              65, 65, 25
 III                                                        30.0                        37.5                         3               1.7 x 1.7 x 2.1              80, 80, 25
 IV                                                         40.0                        50.0                         4               2.2 x 1.7 x 2.1         100, 100, 40
 V                                                          52.0                        62.5                         5               2.7 x 1.7 x 2.1         100, 100, 40
 VI                                                         65.0                        75.0                         6               3.2 x 1.7 x 2.1         100, 100, 40
 VII                                                        80.0                        87.5                         7               3.7 x 1.7 x 2.1         125, 125, 40
 VIII                                                       90.0                        100.0                        8               4.2 x 1.7 x 2.1         125, 125, 40
Recovery approx. 90–95%

Material Specifications                                                                                 Instrumentation
 Low Pressure Piping                     U-PVC                                                           Conductivity                    Feed and product
 Control Cabinet                         MS Powder Coated                                                Pressure Switch                 To ensure minimum
 Skid                                    PU Painted Carbon Steel                                                                         required feed pressure
                                                                                                         P Switch                        Across each CEDI module
                                                                                                                                         to prevent fouling
Feed Water Supply Quality
                                                                                                         Flow Switch                     On each module to prevent
 Pre-treatment                                        -                RO, UF Product                                                    dry running
 Maximum Feed Water Temperature                       °C               4-40
 Feed Conductivity Equivalence                        μS/cm            40
 Maximum Feed Water Chlorine                          ppb              20
 Maximum Hardness as CaCO3                            ppm              1
 Maximum Silica as SiO2                               ppm              1
 Maximum TOC                                          ppb              500
 Maximum Feed Pressure                                bar              7

Electrical Supply
230 / 415/ 480 V, 50 / 60 Hz.

For higher flow rate applications consult your local Veolia Water Solutions & Technologies company, details below.

In keeping with the progressive nature of the company, we reserve the right to amend details without notice.

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