Diffusion Dialysis (DD) Technology and YASA ET Solutions

Gu Zhouying
Sep 25
2 min read

What is Diffusion Dialysis (DD)?

Diffusion Dialysis (DD) is a separation process driven by a concentration gradient. It employs special polymer ion-exchange membranes with selective permeability to allow the recovery of acids or alkalis from mixed solutions.

Anion exchange membranes (AEMs): allow anions (e.g., Cl⁻, SO₄²⁻) to pass while blocking cations.
Cation exchange membranes (CEMs): allow cations (e.g., Na⁺, K⁺) to pass while blocking anions.

For example, in acid recovery, hydrogen ions (H⁺) move through the anion membrane much faster than metal ions, enabling acid separation and recycling, while retaining heavy metals and impurities.

Diffusion Dialysis (DD) Technology and YASA ET Solutions 1

How Does DD Work?

Dialysis chamber: contains the waste acid/alkali solution.
Diffusion chamber: contains water or dilute acid/alkali as the receiving solution.
Through counter-current flow, H⁺ or OH⁻ ions selectively migrate into the diffusion chamber, forming a recovered acid or alkali solution.
Metal ions or impurities are retained, ensuring high-purity recovery.

This process is widely used for acid recovery in electroplating, alkali recycling in aluminum finishing, and sustainable chemical resource management.

DD Principle video

YASA ET DD Lab Test Equipment

YASA ET provides DESALT-DD laboratory test kits for research and pilot studies:

Modular membrane stacks with customizable chamber numbers.
Easy setup for acid or alkali separation tests.
Compact design suitable for universities, R&D labs, and industrial research centers.
Compatible with YASA ET’s anion and cation membranes (YTAEM, YTCEM series) for specific applications.

Diffusion Dialysis (DD) Technology and YASA ET Solutions

YASA ET DD Project Equipment

For industrial applications, YASA ET offers DESALT-DD project-scale diffusion dialysis units:

Scalable design from small pilot plants to large industrial systems.
Robust membrane stacks with PP/SS304 housings.
Integrated with pumps, sensors (pH, conductivity), and PLC/SCADA automation.
Proven in industries such as electroplating, chemical recycling, aluminum processing, and semiconductor manufacturing.
Project equipment ensures high recovery efficiency, low operating costs (no electricity required for ion migration, only for pumping), and supports green manufacturing goals.