JX-9400 EDI electric desalination equipment

EDI equipment, also known as continuous electric desalination technology, scientifically integrates electrodialysis technology and ion exchange technology. Through the selective permeation of cations and anions by cation and anion membranes, as well as the exchange of ions in water by ion exchange resins, the directional migration of ions in water is achieved under the action of an electric field, thus achieving deep purification and desalination of water. The hydrogen ions and hydroxide ions generated by water electrolysis continuously regenerate the loaded resin. Therefore, the EDI water production process can continuously produce high-quality ultrapure water without the need for acid or alkali chemical regeneration. It has the advantages of advanced technology, compact structure, and easy operation, and can be widely used in the fields of electricity, electronics, medicine, chemical industry, food, and laboratory. It is a green revolution in water treatment technology. This new technology can replace traditional ion exchange devices and produce ultrapure water with a resistivity of up to 16-18M Ω· CM.

Equipment Classification

According to different water requirements, various module combinations and complete sets of equipment can be customized

Process characteristics of EDI continuous electric desalination equipment

The EDI process uses an ion selective membrane and ion exchange resin sandwiched between two electrodes under direct current voltage. The DC power electric field between the two poles removes ions from the RO pretreated water. The EDI process system replaces the traditional mixed resin bed to produce deionized water. Unlike the ion exchange mixed bed, the deionization process of EDI can be carried out continuously, with a high degree of automation and no need for acid-base regeneration. Advantages of EDI over traditional mixed beds:

1. Retaining the advantages of continuous desalination by electrodialysis and deep desalination by ion exchange;

2. The amount of ion exchange resin used is small, and compared with ordinary ion exchange resin columns, it saves more than 95% of resin;

3. Ion exchange resin does not require acid-base chemical regeneration, saving a large amount of acid-base and cleaning water, greatly reducing labor intensity;

4. No waste acid or alkali liquid discharge, it is a clean production technology and a green and environmentally friendly product;

5. The process is easy to achieve automatic control, and the combination of EDI with water treatment technologies such as reverse osmosis (RO) and ultrafiltration (UF) can form a complete high-purity water production line;

6. Small footprint and no need for repeated setup of one in use and one regeneration like ion exchange beds;

Application scenarios

1. Electronic chip high-purity water;

2. Supply water for high-voltage electric boilers;

3. Pure water and high-purity water in industries such as chemical engineering, metallurgy, and electroplating;

4. Biotechnology, experimental technology - pure water, high-purity water.

EDI membrane stack inlet conditions

Precautions for operating EDI electric desalination equipment

1. During operation, if poor water supply is introduced into components or there is insufficient power supply, it will increase maintenance workload. The main pollutants in water supply are organic matter, hardness, and iron.

2. A high hardness of the water supply will cause scaling on the concentrated water side of the ion exchange membrane, resulting in a decrease in the quality of pure water. The hardness of the water supply, dissolved carbon dioxide, and high pH will accelerate scaling, and appropriate acid solutions can be used to clean the dirt.

3. Organic pollution in water supply can form thin films on the surfaces of ion exchange resins and ion exchange membranes, which will seriously affect the ion migration rate and thus affect the quality of pure water; When this phenomenon occurs, the pure water chamber needs to be cleaned with an appropriate cleaning agent.

4. If the EDI component operates without electricity or with insufficient power supply, the ions in the freshwater chamber will be in a state of ion saturation, and the quality of pure water will decrease. In order to regenerate the ion exchange resin, water is passed through the components and the power supply voltage is gradually increased to allow the adsorbed ions to migrate out of the system and regenerate the resin. When regenerating resin, the components should operate under high current and low water flow conditions.

5. If the power supply does not have overcurrent protection, be careful not to exceed the power supply capacity of the power supply.

6. If the exterior of the component needs to be cleaned, only use a mild cleaning agent solution and do not use solvents. To prevent electric shock, make sure the power is disconnected before cleaning.