Electrodialysis Reversal (EDR) | Atieh Pardazan Sharif

Electrodialysis Reversal

Introduction to the Electrodialysis Reversal System

Electrodialysis Reversal (EDR) is an advanced technology for water desalination and salinity reduction of brackish water. By utilizing ion-exchange membranes and applying an electric field, dissolved ions are separated from the water stream. This process is designed to remove both positively and negatively charged ions, ensuring that the treated water reaches acceptable quality levels for industrial, power plant, pharmaceutical, and food applications.

Compared to other desalination technologies, EDR is particularly suitable for waters with low to moderate salinity and can operate continuously with minimal downtime and optimized energy consumption. Atieh Pardazan Sharif Holding provides these systems with advanced engineering design, tailored to feed water quality, flow rate, salinity, and project-specific quality requirements to ensure stable and economical industrial performance.

EDR System Operation

The operation of Electrodialysis Reversal is based on ion migration through selective membranes under an applied electric field. Raw water enters the system, and dissolved ions are transferred through the membranes into a concentrate stream, while desalinated water exits the system. The EDR process includes periodic reversal of the electric current direction, which prevents scale buildup and ion fouling, thereby extending membrane life.

This method ensures consistent and stable outlet water quality, protecting downstream equipment such as reverse osmosis units, boilers, cooling systems, and sensitive industrial processes from damage.

Industrial Applications of EDR

EDR systems are widely applied across various industries and offer distinct advantages. In power plants and petrochemical industries, they are used to produce boiler feed water and process water. In the food and pharmaceutical industries, EDR serves as a reliable solution for removing dissolved ions and hardness, improving product quality, and ensuring compliance with health standards. It is also an economical and energy-efficient option for municipal and industrial brackish water desalination compared to high-energy thermal and membrane methods.

Advantages of the EDR System

The use of Electrodialysis Reversal offers multiple benefits, including lower energy consumption compared to thermal methods, reduced scaling and fouling, continuous operation with minimal shutdowns, precise control of hardness and dissolved ions, and extended lifespan of downstream equipment. This technology enables industries to improve operational efficiency while reducing maintenance costs and chemical consumption.

The modular and engineered design of EDR systems by Atieh Pardazan Sharif allows for system expansion in response to changing operational requirements and integration with other treatment technologies to achieve optimal performance and water quality.

Design, Construction & Standards

EDR systems at Atieh Pardazan Sharif Holding are designed based on feed water quality, salinity, chemical composition, required flow rate, and project quality objectives. All equipment—including ion-exchange membranes, pumps, and automated monitoring and control systems—is selected and installed in accordance with international standards such as ASME, ASTM, and environmental regulations. This approach ensures safe, stable, and high-efficiency operation under various operating conditions.

Conclusion

Electrodialysis Reversal (EDR), as an advanced technology for brackish water desalination, provides an effective, sustainable, and economical solution for various industries. Precise engineering design, high-quality equipment selection, and compliance with international standards play a decisive role in extending system life, reducing operational costs, and ensuring consistent output water quality.