DESCRIPTION
 Electrodialysis
(ED) systems separate ionic species from aqueous solutions using an
applied direct current potential across ion-permeable and selective
membranes. A unique feature of Exergy’s ED systems is the ED cell
frame, which is optimized to provide high separation performance.
The cell design is based upon an integrated spacer system and
provides a high internal and external density of membrane stacks.
The ED cell features patented “leak-free” modules. Each ED cell has
a thickness of only 0.5 mm, which provides superior performance to
conventional ED systems. The ED membrane stacks operated in a serial
mode achieve high desalting rates. The ED membrane stacks operated
in a parallel mode provide high capacity.
FEATURES
▪ High efficiency cells
▪ High membrane packing density, thin cells
▪ Low voltage
▪ Excellent distribution
▪ Excellent tightness
▪ High limiting current density
▪ Temperature resistance up to 50ºC
APPLICATIONS
Exergy’s ED systems provide superior separation performance for ionic process solutions. These ED systems incorporate innovative technology developed and licensed from Europe. ED applications include:
▪ Desalination
▪ Direct recovery of process water and electrolytes
from stagnant rinses
▪ Purification of plating baths
▪ Demineralization of cheese whey
▪ Removal of Nitrates from Groundwater
SYSTEM COMPONENTS
Exergy systems are modular, skid –mounted units with quality
components.
Process Equipment
▪ Membrane stack
▪ Liquid transfer pumps (3)
▪ Tanks for concentrate, dilute, and
electrode rinse
▪ Piping and valves
Electrical/Instrumentation and Control (I&C)
▪ Electrical control panel including microprocessor
(PLC) and operator interface unit
▪ Automated values
▪ Level controls
▪ Flow meter
▪ Pressure gauges
OPTIONS
Exergy ED Systems can be provided to meet special plant
requirements. Typical options include:
▪ Heat exchanger
▪ Prefilter (granular activated carbon)
▪ Automated systems, including PLC and
operator interface unit (OIU) options
▪ In-line control options
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