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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.
소개양극성 막 전기투석(BMED)은 특수 막 구조를 이용하여 염을 해당 산과 염기로 직접 전환하는 첨단 전기화학적 분리 기술입니다. 핵심 구성 요소는 양이온 교환층과 음이온 교환층이 적층된 양극성 막(BPM)입니다. 직류(DC) 전기장의 영향으로 BPM은 접합부에서 물 분자의 해리를 촉매하여 H⁺ 및 OH⁻ 이온을 생성합니다. 이 이온들은 막 구조를 통해 이동하여 염 용액의 음이온 및 양이온과 반응함으로써 산과 염기 생성물을 동시에 생성합니다.
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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.
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루브리는 양극성 막 전기투석 기술에 능숙하며, 맞춤형 솔루션을 설계하고 구현하는 데 능숙하여 고객에게 포괄적인 친환경적이고 깨끗한 생산 계획을 제공합니다.
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전기투석의 핵심 원리전기투석 기술의 핵심은 전기장과 선택적 막 기술의 결합에 있으며, 구체적인 원리는 크게 두 부분으로 나뉩니다.1. 직류 전기장의 구동 효과직류 전기장의 작용으로 용액 속의 음이온과 양이온은 방향성을 가지고 이동합니다. 양이온은 음극 쪽으로 이동하고, 음이온은 양극 쪽으로 이동합니다.2. 이온 교환막의 선택적 여과 효과이 시스템에서는 이온 분리를 위해 두 종류의 이온 교환막이 사용됩니다.양이온 교환막: 양이온(예: Na+)만 통과시킵니다.+, 칼슘2+마그네슘2+음이온은 차단하면서 통과시킵니다.음이온 교환막: 음이온(예: Cl⁻)만 통과시킵니다.-, 그래서42-양이온을 차단하면서 통과시킵니다.
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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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IPv6 네트워크 지원
