Pure water equipment, it is mainly used reverse osmosis membrane technology. The principle of the system is to apply certain pressure on water to make water molecules and ionic mineral elements pass through reverse osmosis membrane, and most inorganic salts (including heavy metals), organic matter, bacteria and viruses dissolved in water cannot pass through the reverse osmosis membrane, so as to make the permeated purified water and the impervious concentrated water strictly separated; The pore size of reverse osmosis membrane is only 0.0001 μ m, while the diameter of virus is generally 0.02-0.4 μ m, and that of common bacteria is 0.4-1 μ M.

          In recent decades, the mixed bed ion exchange technology has been used as the standard process for the preparation of ultra pure water. Because it needs periodic regeneration and a large number of chemical drugs (acid and alkali) and pure water are used in the regeneration process, and some environmental problems are caused, so it is necessary to develop the acid-base free ultra-pure water system.

Because traditional ion exchange has been unable to meet the needs of modern industry and environmental protection, EDI technology, which combines membrane, resin and electrochemical principle, has become a revolution of water treatment technology. The regeneration of ion exchange resin is electricity, which is no longer needed acid and alkali, so it is more suitable for the environmental protection requirements of the world.

          Since the industrialization of EDI membrane reactor technology in 1986, thousands of EDI systems have been installed around the world, especially in pharmaceutical, semiconductor, power and surface cleaning industries, and also widely used in wastewater treatment, beverage and microorganism.

Advantages of EDI device

EDI device is used in reverse osmosis system, instead of traditional mixed ion exchange technology (MB DI) to produce stable deionized water. EDI technology has the following advantages compared with mixed ion exchange technology:

① The water quality is stable; ② It is easy to realize automatic control; ③ No shutdown due to regeneration; ④ No chemical regeneration is required; ⑤ Low operating cost; ⑥ Small area of land; ⑦ No sewage discharge.

EDI technology is a kind of revolutionary water treatment technology. It is a high-tech green environmental protection technology, which combines electrodialysis and ion exchange organically. EDI water purification equipment has the advantages of continuous water output, no acid-base regeneration and unattended, and has been used in the system of preparing pure water gradually replacing mixed bed as fine treatment equipment.

EDI device is used in reverse osmosis system, replacing ion exchange resin, without acid and alkali regeneration, and has the characteristics of stable water quality, low operating cost, convenient operation and management, small floor area, etc.

Equipment principle

The ultra pure water equipment adopts pretreatment, reverse osmosis technology, mixed bed, EDI device and post-treatment to remove the conductive medium in water almost completely, and remove the non dissociated colloidal substances, gases and organic substances to a very low level of water treatment equipment.   Ultra pure water equipment is also called: ultra pure water device, ultra pure water machine, ultra pure water instrument, ultra pure water system, laboratory ultra pure water equipment, etc. The resistance rate of ultra pure water produced by super pure water machine shall be greater than 10 megohm generally, and the water above 10 megaohm is called super pure water. Generally, the output of super pure water can reach 18.25 megaohms.

Brief introduction of Technology

① Pretreatment

1. The traditional technology consists of mechanical filter, activated carbon filter and security filter.

2. The latest process consists of mechanical filter, security filter and ultrafiltration.

② Reverse osmosis system

1. Made up of high pressure pump and reverse osmosis

2. It can be divided into primary RO and secondary ro

③ Fine treatment system

1、   Ion exchange and microporous filter composition

2. EDI and microporous filter composition

technological process

The preparation technology of ultra pure water equipment

1. Pretreatment system → reverse osmosis system → intermediate water tank → coarse mixed bed → fine mixing bed → pure water tank → pure water pump → ultraviolet sterilizer → polishing mixed bed → precision filter → water object (≥ 18m) Ω. Cm) (traditional process)

2. Pretreatment → reverse osmosis → intermediate water tank → water pump → EDI device → purified water tank → pure water pump → ultraviolet sterilizer → polishing mixed bed → 0.2 or 0.5 μ M precision filter → water object (≥ 18m) Ω. Cm) (latest process)

3. Pretreatment → primary reverse osmosis → dosing machine (pH regulation) → intermediate water tank → second stage reverse osmosis (positive charge reverse osmosis membrane) → pure water tank → pure water pump → EDI device → ultraviolet sterilizer → 0.2 or 0.5 μ M precision filter → water object (≥ 17m) Ω. Cm) (latest process)

4. Pretreatment → reverse osmosis → intermediate water tank → water pump → EDI device → pure water tank → pure water pump → ultraviolet sterilizer → 0.2 or 0.5 μ M precision filter → water object (≥ 15m) Ω. Cm) (latest process)

5. Pretreatment system → reverse osmosis system → intermediate water tank → pure water pump → coarse mixed bed → fine mixing bed → ultraviolet sterilizer → precision filter → water object (≥ 15m) Ω. Cm) (traditional process) the above processes have their own advantages, you can choose the appropriate technology according to your own situation. With the development of science, many new processes have replaced the old ones. The reverse osmosis method has been widely used to obtain high purity water, and it is also the most current process.

Equipment features

1. the water permeability is large and the desalination rate is high. Under normal conditions ≥ 98%

2. it has a high interception and removal effect on organic matter, colloid, particle, bacteria, virus, heat source, etc.

3. the energy consumption is small, the water utilization rate is high, and the operating cost is lower than other desalination equipment.

4. there is no phase change in the separation process, and it has reliable stability.

5. the equipment is small in volume, easy to operate, easy to maintain, adaptable and long in service life

Application scope of RO pure water equipment

1. preparation of pure water and super pure water in electronic, industrial, pharmaceutical, food and other industries;

2. water for purification and preparation of light textile, chemical industry process water / chemical circulating water, chemical product manufacturing, etc;

3. water purification and preparation for water, drinking water, beverages, beer, Baijiu and health products in food and beverage industry;

4. use useful substances and concentrate and recover water solutions in industrial production;

5. pre desalination treatment of the supply water of high pressure boiler in power industry, thermal power generation boiler, power system of medium and low pressure boiler in the factory and mine;

6. desalination of bitterly salted water and sea water;

7. the purified water device is used as the primary desalination equipment for high purity water production.

8. various enterprises and institutions with large numbers of community, real estate, school, factory, hospital, tea house, hotel, beauty salon and canteen.

9. it can be used for the production of bottled water, mineral water and other filling water.

10. flushing water for electronic components such as integrated circuit for electronic industry, silicon chip, display tube and other electronic components

11. large infusion, injection, tablet, biochemical products and equipment cleaning in pharmaceutical industry;

12. desalination of seawater and brackish water   Islands, ships, offshore drilling platforms, brackish water areas

13. other process water   Super pure water is used for automobiles, home appliance coating, coated glass, chemical products, fine chemicals, etc.