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Electrodeionization EDI ion exchange electrodialysis ultrapure water purification machine
Simple Introduction of xjy’s EDI
First of all, electrodeionization (EDI) is an electrically-driven water treatment technology. So, that uses electricity, ion exchange membranes and resin to remove ionized species from water.
What is the detailed introduction of xjy's EDI system?
XJY’s electrodeionization (EDI) is a water treatment technology that utilizes DC power, ion exchange membranes, and ion exchange resin to deionize water. XJY’s EDI is typically employed as a polishing treatment following reverse osmosis (RO), and is used in the production of ultrapure water. It differs from other RO polishing methods, like chemically regenerated mixed beds, by operating continuously without chemical regeneration.
XJY’s electrodeionization can be used to produce high purity water, reaching electrical resistivity values as high as 18.2 MΩ/cm.
picture 1 EDI Equipment
XJY’s electrodeionization (EDI) integrates three distinct processes:
1.Electrolysis: A continuous DC current directs positive and negative ions toward electrodes with opposing electrical charges. The electrical potential draws anions and cations from diluting chambers, through cation or anion exchange membranes, into concentrating chambers.
2.Ion exchange: An ion exchange resin fills the diluting chambers. As water flows through the resin bed, cations and anions become affixed to resin sites.
3.Electrochemical regeneration: Unlike chemically regenerated mixed beds, EDI accomplishes regeneration through water splitting induced by the continuous electric current. Water splits from H2O into H+ and OH- to effectively regenerate the resin without the need for external chemical additives.
XJY’s EDI is sometimes labeled "continuous electrodeionization" (CEDI) because the electric current continually regenerates the ion exchange resin mass.
What are the EDI machine workflows of xjy?
The XJY’s electrodeionozation EDI systems module consists of a set of chambers. So, we fill this chamber with ion exchange resins and separated by ion-exchange membranes. Thus, water enters the module, where an applied electrical field at right-angles to the flow forces ions to move through the resins and across the membranes. These impurity ions are not permanently bound to the media. But instead, system collect them into concentrate streams which it goes to drain or recycle. You can use the deionized product water directly or undergo further treatment for enhanced water purity.
The XJY’s EDI module acts, in effect, as an ion exchange bed which is continuously regenerated electrically. When the ions move through the resins and between the cation or anion selective membranes. So, XJY’s electrodeionization EDI Systems exchange for H+ and OH- ions. Hence, ions that become bound to the ion exchange resins eventually migrate to a separate chamber. Under the influence of the externally applied electric field; this also produces the H+ and OH- ions necessary to maintain the resins in their regenerated state. Ions in the separate chamber, system flush them to waste.
picture 2 Technical Principles of EDI
Meanwhile, the limitations of electrodeionozation EDI systems differ from conventional ion exchange or reverse osmosis system. In addition, product water ionic purity has essentially limit by the total number of ions taken up by the resins. As a result, the maximum rate of arrival of ions limit the EDI. Too high an ionic load will tend to overload the module accordingly. Therefore, we often use EDI after reverse osmosis and, if the water is very hard, with degassing to remove carbon dioxide.
What are the key components of xjy’s EDI water treatment?
1.Ion - Exchange Resins: These resins are responsible for the initial ion exchange and help in the removal of ions from the water. They have a high affinity for ions and are distributed within the EDI cell.
2.Electrodes: The anode and cathode provide the electrical potential necessary for the migration of ions. The electrodes are made of materials that can conduct electricity effectively and withstand the electrochemical environment within the EDI system.
picture 3 Key Components of EDI
3.Membranes: Cation - exchange membranes and anion - exchange membranes are used. These membranes are thin, semi - permeable barriers that separate the different compartments within the EDI stack and control the movement of ions.
What is the xjy’s installation plan?
The typical EDI installation has the following components: electrodes, anion exchange membranes, cation exchange membranes, and resin. The simplest configurations comprise three compartments. To increase production intensity or efficiency, the number of compartments or cells can be increased as desired.
picture 4 EDI System
Once the system is installed and feedwater begins to flow through it, cations flow toward the cathode and anions flow toward the anode. Only anions can go through the anion exchange membrane, and only cations can go through the cation exchange membrane. This configuration allows anions and cations to flow in only one direction because of the selectivity of the membranes and the electrical forces, rendering the feedwater relatively free of ions. It also allows for the separate collection of cation and anion concentration flows, creating the opportunity for more selective waste disposal, recycling, or reuse; this is especially useful in the removal of heavy metal cations.
What are the main features and advantages of xjy’s EDI model?
1.High Water Quality and Stability: EDI consistently produces ultrapure water with resistivities exceeding 15 MΩ·cm, meeting the stringent requirements of industries such as electronics, semiconductors, and pharmaceuticals.
2.Environmentally Friendly and Cost-Effective: By eliminating the need for chemical regeneration, EDI significantly reduces the generation of hazardous waste and lowers operational costs.
3.Continuous Operation: Unlike traditional ion exchange systems that require periodic downtime for resin regeneration, EDI operates continuously, enhancing productivity and efficiency.
4.Ease of Operation and Safety: The modular design and straightforward operation of EDI systems make them user-friendly. Additionally, the absence of harmful chemicals during operation enhances workplace safety.
5.Space-Saving: EDI systems are compact, making them suitable for installation in space-constrained facilities.
Where are xjy's EDI deionized machines mainly used?
picture 5 Applications of EDI
XJY’s EDI technology finds extensive application in various industries, including:
1.Electronics and Semiconductors: For rinsing, etching, and other processes requiring ultrapure water to prevent contamination and ensure product quality.
2.Pharmaceuticals: In the production of drugs and medical devices, where ultrapure water is essential for ensuring sterility and purity.
3.Power Generation and Petrochemicals: For boiler feedwater, cooling water systems, and other applications requiring high-purity water to maintain equipment integrity and operational efficiency.
4.Fine Chemicals and High-Tech Industries: Where ultrapure water is a crucial component in research, development, and manufacturing processes.
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