DIFFUSION DIALYSIS TEST EQUIPMENT INTRODUCTION
DESALT Diffusion Dialysis (DD) test equipment was designed to test diffusion dialysis principle and effectiveness on spent alkali or spent acid solutions.
Diffusion dialysis is a process used to separate electrolytes from non-electrolytes or to desalt solutions.
The lab test equipment for diffusion dialysis includes:
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Diffusion Dialysis Cell: These are the main units where the separation process occurs. It consists of compartments separated by membranes through which the diffusion of ions occurs.
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Anion or Cation Selective Membranes: Selective membranes that allow the passage of ions based on their charge and size, facilitating the separation process.
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Pump System: pumps and instruments to regulate the flow rates of the feed and dialysate solutions, ensuring optimal separation efficiency.
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Monitoring and Control Instruments: Sensors and meters to monitor parameters such as pH, conductivity, and temperature, crucial for maintaining optimal conditions during the process can be added to custom made units.
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Diffusion Dialysis Test Equipment Membrane Working Principle and Applications
The lab test equipment equipped with bipolar membranes (EDBM) is capable of producing acid and base solutions from the corresponding saline solution used as a feed by employing the water dissociation function of Bipolar Membranes.
DESALT-EDBM test equipment bipolar membranes consists of a sequence of three channels hosting the electrolyte solutions separated by three ion-exchange membranes: anion (AEM), cation (CEM), and bipolar (BPM). The two electrodes and an electrode rinse solution (ERS) are used to convert electricity into ionic current.
In the drawings and video above, we present the DESALT-EDBM bipolar membranes working principle.
When an electric potential is applied between the two electrodes, the water dissociation reaction takes place in the interlayer of the bipolar membrane, resulting in the production of protons and hydroxide ions. Due to the applied electric field, the ions are driven to opposite sides of the BPM based on their charge. Consequently, acidic and alkaline solutions are produced.
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Bipolar electrodialysis is an innovative and efficient process that capitalizes on the unique properties of bipolar membranes to transform and separate ionic species.
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Some more applications that can be tested with the lab scale system of bipolar electrodialysis (EDBM) include Lithium Hydroxide production in the lithium industry, NaOH and HCl production from RO brines, CO2 capturing plants, and many more applications as shown below.
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DESALT
Diffusion Dialysis TEST EQUIPMENT FEATURES
1
High and selective acid recovery performance
Designed to efficiently recover free acids such as HCl and Hâ‚‚SOâ‚„ while retaining metal ions and valuable salts in the feed stream, ensuring minimal product loss and reliable separation results.
2
Reliable lab-scale process validation
Enables accurate feasibility studies, membrane performance evaluation, and parameter optimization under real wastewater or process conditions before pilot or industrial scale implementation.
3
Low operating cost and sustainable operatio
Operates without chemical additives and with extremely low energy consumption, making it an environmentally friendly and cost-effective solution for acid recovery research and testing.
4
Compact, modular, and user-friendly design
Skid-mounted lab system with flexible configuration, simple operation, and easy maintenance, suitable for R&D labs, universities, and industrial process development centers.
DIFFUSION DIALYSIS PILOT PLANT ADVANTAGES
YASA ET Diffusion Dialysis (DD) Pilot Equipment is designed for acid recovery and purification from acidic waste streams. The system uses selective ion-exchange membranes to recover free acids without external energy input, making it ideal for process validation, pilot testing, and scale-up studies in chemical, metal finishing, and recycling industries
1. High acid recovery efficiency
Selectively recovers free acids such as HCl and Hâ‚‚SOâ‚„ while minimizing metal ion and salt transfer, ensuring stable and predictable recovery performance.
2. No electrical power or chemical consumption
Operates solely on concentration gradients through diffusion dialysis membranes, resulting in extremely low operating costs and high process sustainability.
3. Proven pilot-scale performance validation
Enables realistic testing under actual process conditions, providing reliable data for system sizing, membrane selection, and industrial scale-up.
4. Flexible and modular system configuration
Easily adaptable to different acid types, concentrations, and flow rates, supporting a wide range of industrial and research applications.
5. Compact, robust, and user-friendly design
Skid-mounted pilot unit with simple operation, low maintenance requirements, and high reliability for continuous testing and demonstration purposes.
