Electrodialysis Reversal (EDR) is an electrochemical separation process that removes ions and other charged species from water and other fluids.
EDR uses small quantities of electricity to transport these species through membranes composed of ion exchange material to create a separate purified and concentrated stream.
Ions are transferred through the membranes by means of direct current (DC) voltage and are removed from the feed water as the current drives the ions through the membranes to desalinate the process stream.
GE EDR technology is very water efficient, with designs up to 94% water recovery, reducing the burden on water sources, and minimizing the volume of waste that requires disposal.
GE EDR systems have an automatic Polarity Reversal self-cleaning feature that reduces the fouling tendencies of the water by reversing the polarity of the electrodes every 15 to 20 minutes. This change in polarity causes scale and organics to disassociate from the membranes.
In addition, EDR membranes can operate on waters with up to 0.5 ppm chlorine to control the biological nature of a feed water, and can also be shock-chlorinated up to 30 mg/l for maximum cleaning efficiency if required.
GE EDR products are ideal to desalinate challenging brackish waters such as surface waters and waste waters. Applications for EDR technology include municipal drinking water, industrial process water, and wastewater reuse projects.
Municipalities find EDR successful for the removal of radium, arsenic, and perchlorates as well as desalination of well and surface waters. Electrodialysis Reversal reliably desalinates water to customer specifications for industrial process requirements, such as boiler make up water. Additionally, because of its rugged membranes and high chlorine tolerance, EDR membranes are ideal for wastewater reuse projects.
For an EDR Installation List that is representative of the thousands of systems installed,
click here.
Benefits To You
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High water recovery design efficiently processes a source water and generates low concentrate volume for disposal. |
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Rugged systems are less sensitive than reverse osmosis (RO) to particulates and metal oxides. |
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Long membrane life (typically 10 years) lowers the cost of ownership. |
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Chlorine-resistant membranes are tolerant to disinfection, allowing use on challenging waters. |
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Reclaim waste waters to reduced waste discharges and reduce water use charges. |
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Easily control salt removal and product quality by adjusting amount of electricity applied to membrane stack. |
GE EDR Product Line
The GE EDR product line has a wide flow capacity with the ability to treat anywhere from 4,000 GPD up to 1.6 million GPD per unit (15 m3/day to 6,060 m3/day per unit). Electrodialysis reversal systems are able to reduce dissolved ions in process streams of up to 12,000 ppm total dissolved solids (TDS) from 50% to up 94% removal. By using multiple stages (stacks in series), systems are optimized to handle a wide range of treatment needs.
With over 50 years of experience EDR and broad application expertise, GE can provide a standard EDR system and replacement parts or engineer a complete system tailored to your needs.
For product technical information, please see Product Information below.
