Principle and operation method of industrial EDI ultrapure water equipment

Ultrapure water equipment uses advanced reverse osmosis membrane water treatment technology and mature ion exchange water treatment technology, which is an irreplaceable means in the current high-purity water production process. Ultrapure water production equipment has high water quality, continuous water production, no wastewater generation, and saves labor costs, making it popular among industrial production enterprises. In the ultrapure water production equipment EDI systems are suitable for water treatment, electronics, laboratory ultrapure water, and hospital ultrapure water systems. Nowadays, more and more industrial production processes rely on industrial EDI ultrapure water equipment. However, many people are not familiar with its operation, so today we will focus on the principle of industrial EDI ultrapure water equipment and its operation methods.

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I. Industrial Principle of EDI ultrapure water equipment

1. After entering the EDI module, RO water is evenly distributed into the freshwater chamber.

2. Trace ions not removed by the RO membrane are adsorbed on the membrane surface by the ion exchange resin in the freshwater chamber.

3. Direct current is applied to the two electrodes of the EDI module, driving the anions and cations in the freshwater chamber to migrate to the corresponding electrodes in the concentrate chamber, thereby producing high-purity water.

4. Under the action of the electric field, water molecules are largely ionized into H+ and OH-, continuously regenerating the ion exchange resin.

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II. Industrial Operation methods of EDI ultrapure water equipment

1. In case of failure of the industrial EDI ultrapure water equipment, please immediately close the tap water inlet valve and cut off the water supply to the water purifier. Do not disassemble it yourself.

2. In case of tap water outage, please open the drain faucet to drain the mud, rust, etc. in the tap water pipe before using the purified water.

3. The total water output of the industrial EDI ultrapure water equipment is related to the influent water quality. If the influent water quality of the industrial EDI ultrapure water equipment is good, the total water output will increase; conversely, if the influent water quality is poor, the total water output will decrease, and the service life of the filter element will be slightly shorter.

4. If the industrial EDI ultrapure water equipment is not used for more than three days, it should be repeatedly flushed for 2-5 minutes until the stored water in the industrial pure water equipment is drained.

5. With the long-term use of the industrial EDI ultrapure water equipment, its water output will gradually decrease, but the water quality is still qualified and can be used with confidence.

6. After use, the ultrafiltration membrane filter element should be kept moist. If the ultrafiltration membrane filter element is dried, the water output will decrease sharply and cannot be recovered.

7. The compatibility between reagents should be considered, and then the compatibility between reagents and membrane materials should be considered. For example, coagulants, flocculants, bactericides, reducing agents, and scale inhibitors are often used simultaneously in RO systems. Since the limbs in natural water generally carry a negative charge, cationic coagulants with a positive charge are usually used.

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III. Industrial Characteristics of EDI ultrapure water equipment

Taking the industrial EDI ultrapure water equipment of a certain water treatment plant as an example For explanation.

1. Wide voltage regulation range, normal operation even with input voltage fluctuation of ±20%.

2. High efficiency, the product has a power factor correction circuit, and the power factor can reach 0.98 or more.

3. Stepless continuous adjustment of output voltage and current, automatic switching between voltage and current regulation.

4. The current change from small to large load is less than 0.1%.

5. High safety performance, the output end can be short-circuited arbitrarily without causing damage to the machine, and the short-circuit current can be continuously adjusted.

6. Using advanced high-frequency pulse width modulation technology, it has the characteristics of strong stability, high precision, small size, light weight, and low power consumption.