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DESALT Bipolar Electrodialysis Equipment & Systems

The Bipolar Membrane Electrodialysis (EDBM) equipment was developed to simultaneously split an aqueous saline solution into its corresponding acid and base solutions without addition of chemicals.

The DESALT-EDBM equipment ability to dissociate water into hydronium ions and hydroxyl ions, bipolar electrodialysis has been found many applications in industries and daily life, such as chemical production and separation, biochemical engineering, among many others.

Electricity, combined with the carefully selected bipolar, cation, and anion membranes, promotes water dissociation and the production of acid and bases from a feed solution inside the bipolar electrodialysis membrane stack.

Explore with us our Bipolar Electrodialysis factory.

What Is Bipolar Electrodialysis?

Bipolar Electrodialysis (BPED) is a membrane-based treatment technology that works by applying an electric field to a feed solution that flow between bipolar, anionic, and cationic electrodialysis membranes.


The process uses a series of alternating cationic, anionic, and bipolar electrodialysis membranes, creating a flow of ions that results in the removal of impurities or in the formation of acid and bases.

EDBM Industrial membrane stack_website.webp

Bipolar Electrodialysis Working Principle

The working principle of electrodialysis with bipolar membranes (EDBM) is the combination of electrodialysis for salt separation with electrodialysis water splitting for the conversion of a salt into its corresponding acid and base. The bipolar membranes enhance the splitting of water into protons and hydroxide ions.

Bipolar Electrodialysis Equipment Performance

The performance of Electrodialysis Bipolar Membranes (EDBM) is mainly related to the feed solution.


Generally speaking, the bipolar electrodialysis equipment is an efficient and cost-effective method of water treatment that has a wide range of applications.


The use of bipolar membranes and ion exchange membranes allows for the generation of acid and bases, for example NaOH and HCl from a NaCl feed solution, producing high purity output with minimal energy consumption.


For a correct assessment of the capabilities of bipolar electrodialysis we recommend DESALT-EDBM Test Equipment.

Advantages of Bipolar Electrodialysis

Bipolar Electrodialysis technology, has acted as a new growth point in electrodialysis industries due to its superiority to conventional water electrolysis with the following advantages:

  • No gases generated and low running cost (water is directly dissociated to H+ and OH−);

  • Low initial cost and space-saving (no electrode is needed in the repeating cell);

  • No oxidation and/or reduction species that may produce undesirable products (no electrochemical reaction).

Applications of Bipolar Electrodialysis (EDBM) Equipment and Systems

Bipolar Electrodialysis (EDBM) equipment and systems technology is currently used in many industries, including desalination plants and lithium extraction and production.


It is also used in industries such as pharmaceuticals, food and beverage, and electronics, where production quality is critical for production processes.


Finally, Bipolar Electrodialysis is often used in the chemical industry to concentrate components and increase the final product purity.

Recovery of Acid and Base from RO Brine

Thanks to DESALT Bipolar Electrodialysis equipment we can recover acid and base from a sodium chloride solution.


also used for brine concentration, a process that involves removing water from a saline solution to increase the concentration of dissolved salts. Brine concentration is used in various industrial applications, including chemical production and wastewater treatment.

Starting with a high saline solution, the bipolar membranes can desalinate the feed stream, while at the same time it can generate NaOH and HCl as shown in the picture below.  


The Bipolar Electrodialysis technology can be combine with Electrodialysis Reversal (EDR) to increase the feed solution salt concentration and achieve higher concentrations in the acid and base compartments.

By combining these two solutions we can produce chemicals and recover water all at the same time.

Bipoalr Electrodialysis for NaOH and HCl production scheme.png

Discover more applications of Bipolar Electrodialysis by clicking on the button below.

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We also offer custom made solutions for Bipolar Electrodialysis, including Bipolar Electrodialysis test equipment and pilot plants.

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DESALT Bipolar Electrodialysis (EDBM) Equipment and Systems FAQs

What is Bipolar Electrodialysis (EDBM)?

Bipolar Electrodialysis (EDBM) is an advanced separation process that utilizes ion-exchange membranes and an electric field to desalinate and recover valuable acids and bases from saline solutions. This technology is particularly effective in applications requiring the separation and concentration of ionic species.

How does DESALT Bipolar Electrodialysis work?

DESALT Bipolar Electrodialysis operates by passing an electric current through a series of ion-exchange membranes arranged between electrodes. These membranes selectively allow cations or anions to pass, creating an ion-depleted stream (dilute) and an ion-concentrated stream (concentrate). The bipolar membranes split water into H+ and OH- ions, enabling the conversion of salts into their corresponding acids and bases.

What are the key applications of EDBM?

  1. Acid and Base Recovery: Recovering acids and bases from industrial waste streams.

  2. Chemical Production: Producing high-purity acids and bases.

  3. Pharmaceuticals: Purifying active pharmaceutical ingredients.

  4. Food and Beverage: Enhancing flavours and improving product stability.

What are the benefits of using DESALT Bipolar Electrodialysis systems?

  • High Efficiency: EDBM systems provide high separation efficiency and recovery rates.

  • Cost-Effective: Reduced chemical usage and lower operational costs.

  • Circularity: Minimizes waste generation and energy consumption.

  • Scalable: Suitable for various scales, from laboratory to industrial applications.

  • Versatile: Can handle a wide range of feed compositions and concentrations.

How do I choose the right Bipolar Electrodialysis system for my project?

Selecting the appropriate DESALT Bipolar Electrodialysis system depends on several factors:

  • Feed Composition: The type and concentration of ions in the feed solution.

  • Desired Output: The required purity and concentration of the final product.

  • Throughput: The volume of solution to be processed.

  • Operational Conditions: Temperature, pressure, and other environmental factors. Consulting with our experts can help tailor a system to meet specific requirements.

What maintenance is required for bipolar electrodialysis systems?

Regular maintenance of DESALT EDBM systems involves:

  • Membrane Cleaning: Periodic cleaning to prevent fouling and scaling.

  • System Inspection: Routine checks for leaks, membrane integrity, and electrical components.

  • Performance Monitoring: Continuous monitoring of system performance parameters to ensure optimal operation.

  • Spare Parts Management: Keeping essential spare parts on hand to minimize downtime.

How does EDBM compare to other desalination technologies?

EDBM offers several advantages over traditional desalination methods such as reverse osmosis and thermal distillation:

  • Selective Separation: Higher selectivity for specific ions.

  • Energy Efficiency: Lower energy consumption due to electrochemical separation.

  • Chemical Savings: Reduced need for chemical additives and pH adjustments.

  • By-product Utilization: Enables the recovery of valuable by-products, reducing waste.

Can DESALT Bipolar Electrodialysis systems be integrated with other treatment processes?

Yes, bipolar electrodialysis systems can be integrated with other water treatment and purification processes to enhance overall efficiency and effectiveness. Common integrations include pre-treatment processes like filtration and post-treatment processes such as ion exchange and advanced oxidation.

Where can I get more information about Bipolar Electrodialysis Systems?

Get in touch with our team to get more information about DESALT Bipolar Electrodialysis equipment and systems, lab testing and pilot plant solutions.

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