Bipolar Membranes

Core Principle of Electrodialysis The core of electrodialysis technology lies in the combination of electric field and selective membrane technology. Its specific principle is divided into two parts: Driving Effect of DC Electric Field and Concentration GradientUnder the action of a DC electric field or concentration gradient, anions and cations in the solution move directionally: cations migrate toward the negative electrode, while anions migrate toward the positive electrode; solutes move from high-concentration solutions to low-concentration ones. Selective Sieving Effect of Ion Exchange MembranesTwo types of ion exchange membranes are used in the system to achieve ion separation: Cation Exchange Membrane: Only allows cations (e.g., Na⁺, Ca²⁺, Mg²⁺) to pass through, while blocking anions. Anion Exchange Membrane: Only allows anions (e.g., Cl⁻, SO₄²⁻) to pass through, while blocking cations.