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High Efficiency Industrial Electrodialyzer for Water Desalination and Solution Concentration
Electrodialyzer is a core ion separation equipment adopting electrodialysis technology. By applying DC electric field and matching anion and cation exchange membranes, it realizes directional migration and separation of ions in liquid. With simple and reliable structure, it is classified into screw-fastened and hydraulic integrated types for different usage scales. Widely applied in seawater desalination, industrial wastewater treatment, food concentration, pharmaceutical purification and new energy electrolyte processing, it efficiently completes solution desalination, concentration and ionic impurity removal.
I. Definition
An electrodialyzer is a device that uses ion-exchange membranes (anion-exchange membranes and cation-exchange membranes) to selectively migrate ions under the action of a direct current (DC) electric field. Its core principle is: driven by the electric field, cations in the solution migrate to the cathode and pass through the cation-exchange membranes, while anions migrate to the anode and pass through the anion-exchange membranes, thereby achieving desalination or concentration of the solution. The equipment is suitable for treating saline water bodies (such as seawater and industrial wastewater), efficiently removing ionic impurities while retaining non-ionic components.
II. Structure
Membrane Pair: The basic unit, formed by the alternating arrangement of anion-exchange membranes, diluting compartment spacers, cation-exchange membranes, and concentrating compartment spacers.
Membrane Stack: The core component of the electrodialyzer, assembled by stacking multiple membrane pairs, responsible for the ion separation process.
Auxiliary Components: On both sides of the membrane stack are electrodes (to provide the electric field), water distribution plates (to evenly distribute water flow), and clamping plates (to fix the membrane stack structure)
III. Classification
Electrodialyzers are mainly divided into two categories based on their fastening method and structural design:
Screw-fastened Type: Mechanically fastens the membrane stack with screws. It features a simple structure and low cost, suitable for small and medium-sized systems (such as laboratories or small-scale water treatment).
Hydraulic Integrated Type: Uses a hydraulic system for automatic fastening, with uniform pressure and good sealing. It is suitable for large-scale industrial applications (such as seawater desalination plants), reducing membrane fouling and extending equipment service life.
IV. Application
ScenariosElectrodialyzers play a key role in multiple fields, with typical applications including:
Water Treatment and Seawater Desalination: Used for brackish water desalination (e.g., drinking water production in inland areas), removing over 90% of salts from water.
Industrial Wastewater Reuse: Recovers heavy metal ions (such as nickel and copper) in industries like electroplating and printing and dyeing, achieving zero liquid discharge of wastewater.
Food and Pharmaceutical Industry: Concentrates fruit juice, whey protein, or purifies pharmaceutical ingredients while preserving the activity of heat-sensitive substances.
New Energy Sector: Assists in purifying electrolyte solutions during hydrogen production to improve the efficiency of hydrogen energy production.
IntroducereElectrodializa cu membrană bipolară (BMED) este o tehnologie avansată de separare electrochimică ce utilizează o stivă specializată de membrane pentru a converti direct sărurile în acizi și baze corespunzătoare. Componenta principală este membrana bipolară (BPM), care constă dintr-un strat de schimb cationic și un strat de schimb anionic laminate împreună. Sub influența unui câmp electric de curent continuu (DC), BPM catalizează disocierea moleculelor de apă la joncțiunea sa, producând ioni H⁺ și OH⁻. Acești ioni migrează prin stiva de membrane pentru a reacționa cu anionii și cationii dintr-o soluție de alimentare cu sare, generând astfel simultan produse acide și bazice.
CITEŞTE MAI MULT
Electrodialyzer is a core ion separation equipment adopting electrodialysis technology. By applying DC electric field and matching anion and cation exchange membranes, it realizes directional migration and separation of ions in liquid. With simple and reliable structure, it is classified into screw-fastened and hydraulic integrated types for different usage scales. Widely applied in seawater desalination, industrial wastewater treatment, food concentration, pharmaceutical purification and new energy electrolyte processing, it efficiently completes solution desalination, concentration and ionic impurity removal.
CITEŞTE MAI MULT
Rubri este expertă în tehnologia dializei prin difuzie și are competențe în proiectarea și implementarea de soluții personalizate, oferind clienților soluții complete de producție ecologice și curate.
CITEŞTE MAI MULT
Rubri este expertă în tehnologia electrodializei cu membrană bipolară și are competențe în proiectarea și implementarea de soluții personalizate, oferind clienților planuri de producție ecologice și curate.
CITEŞTE MAI MULT
Principiul de bază al electrodializeiNucleul tehnologiei de electrodializă constă în combinarea câmpului electric cu tehnologia membranei selective, principiul specific fiind împărțit în două părți:1. Efectul de acționare al câmpului electric de curent continuuSub acțiunea unui câmp electric de curent continuu, anionii și cationii din soluție se mișcă direcțional: cationii migrează spre electrodul negativ, în timp ce anionii migrează spre electrodul pozitiv.2. Efectul de cernere selectivă al membranelor schimbătoare de ioniDouă tipuri de membrane schimbătoare de ioni sunt utilizate în sistem pentru a realiza separarea ionilor:Membrană schimbătoare de cationi: Permite doar cationi (de exemplu, Na+, Ca2+, Mg2+) să treacă, blocând în același timp anionii.Membrană schimbătoare de anioni: Permite doar anioni (de exemplu, Cl-, AȘA42-) să treacă, blocând în același timp cationii.
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This technology is based on the principle of bipolar membrane electrodialysis. Under the action of a direct current electric field, it utilizes bipolar membranes to efficiently dissociate water molecules into hydrogen ions and hydroxide ions. This process then directionally converts salts in electroplating wastewater (such as sodium chloride, sodium sulfate, etc.) into corresponding acids (such as hydrochloric acid, sulfuric acid) and alkalis (such as sodium hydroxide), achieving the dual objectives of wastewater purification and resource recovery.
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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.
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Core Principle of Bipolar Membrane Electrodialysis (BPED) The core of BPED technology lies in the combination of electric field, selective membrane technology, and the unique water-splitting capability of bipolar membranes. 1. Driving Effect of DC Electric FieldUnder a DC electric field, ions migrate directionally: cations move toward the cathode, while anions move toward the anode. 2. Membrane Functions Bipolar Membrane (BPM): Splits water ( H2O ) into H+ and OH− ions under the electric field, providing a source for acid and base production. Cation Exchange Membrane (CEM): Selectively allows cations to pass through. Anion Exchange Membrane (AEM): Selectively allows anions to pass through. By arranging these membranes alternately, salts can be converted into corresponding acids and bases.
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