Nowadays, driven by the situation of reducing consumption and emission, saving water and electricity, and saving resources, the ultra-pure water production process has undergone tremendous changes. The combined process of RO and EDI has become the leading process for the production of deionized water, pure water, purified water, demineralized water, high-purity water, water for injection, ultra-pure water, and ultra-pure water for injection.
In the field of deionized water, pure water, purified water, chemical water, high-purity water, and water for injection, currently the commonly used processes are as follows:
â‘´Water salinity <150ppm under the condition that the salinity of tap water is less than 150ppm
â‘ Using the level 1 RO + 2MB double mixed bed production process â‘¡Using the level 1 RO + 1 level EDI production process â‘¢Using the level 1 RO + 2 level EDI production process
â‘¡â‘¢Compared with â‘ process, MB mixed bed is not used, acid-base regeneration is not used, no sewage or waste gas is generated, manpower, water and electricity, land and resin resources are saved, and operating costs are saved. â‘¢ Process and â‘¡ process have higher purity of produced water and stable produced water quality.
⑵Water salinity: 150-300ppm under the condition of 150-300ppm
â‘ Using the level 1 RO + 2MB double mixed bed production process â‘£Using the level 2 RO + 1 level EDI production process â‘¢Using the level 1 RO + 2 level EDI production process
④③Compared with ①process, MB mixed bed is not used, acid and alkali regeneration is not used, no sewage or waste gas is generated, manpower, water and electricity, land and resin resources are saved, and operating costs are saved.
â‘¢Compared with â‘£ process, it saves MB polishing mixed bed investment and huge cost of polishing resin consumables.
(3) The salinity of tap water is under 400-600PPM Water salinity: 4000-600ppm
①The production process of the double-bed RO + 2MB double mixed bed is often used ⑤The production process of the RO + 2 level EDI + MB polishing mixed bed is often used ⑥The production process of the RO 2 level + EDI is often used
⑤⑥ Compared with ①process, MB mixed bed is not used, acid and alkali regeneration is not used, no sewage or waste gas is generated, manpower, water and electricity, land and resin resources are saved, and operating costs are saved.
⑥ Process and ⑤ process ratio save MB polishing mixed bed investment and huge cost of polishing resin consumables.
2. In the field of production of chemical water, high-purity water, water for injection, ultra-pure water, and ultra-pure water for injection, the following commonly used processes are as follows:
â‘´The salt content of tap water is under 150-300PPM
⑦Usually adopts the production process of level 1 RO + 2MB double mixed bed + MB polishing mixed bed ⑤usually adopts the level 2RO + 1 level EDI + MB polishing mixed bed production process ⑥usually adopts the level 2 RO + 2 level EDI production process
⑤⑥Compared with ⑦ process, MB mixed bed is not used, acid-base regeneration is not used, no sewage or waste gas is generated, manpower, water and electricity, land and resin resources are saved, and operating costs are saved.
⑥ Process and ⑤ process ratio save MB polishing mixed bed investment and huge cost of polishing resin consumables.
⑵The salt content of tap water is under 300-600ppm
⑦Usually adopts the production process of 2-level RO + 2MB double mixed bed + MB polishing mixed bed ⑤Usually adopts the production process of 2-level RO + 1 level EDI + MB polishing mixed bed
⑤ Compared with ⑦ process, MB mixed bed is not used, acid-base regeneration is not used, no sewage or waste gas is generated, manpower, water and electricity, land and resin resources are saved, and operating costs are saved.
⑧Compared with ⑤ process, it saves MB polishing mixed bed investment and huge cost of polishing resin consumables.
3. Summary
â‘´ The important advantages of the 2nd grade RO + 2nd grade EDI production process are:
The important advantage of the "two stage RO + two stage EDI production process"
★ It has the ability to resist the big change of the salt content of the raw water. In the production of deionized water, pure water, purified water, chemical water, high-purity water, and water for injection, when the amount of salt in the raw water is 100-600PPM, the production process of level 2 RO + level 2 EDI is unique compared to other processes A process that does not use polishing mixed beds has extremely high advantages in environmental protection, water and electricity saving, saving resin resources, land resources, and human resources.
★ In the production of ultra-pure water and ultra-pure water for injection, when the salt content of the raw water is 150-600PPM, the production process of grade 2 RO + grade 2 EDI + grade 2 EDI is the highest and most stable compared with other processes One process is also the only process that does not use polishing mixed bed, and it has extremely high advantages in environmental protection, water and electricity saving, saving resin resources, land resources and human resources.
⑵ The disadvantages of the 2nd-level RO + 2nd-level EDI production process are
★ When the amount of salt in the raw water house is less than 150PPM, the production process of level 1 RO + level 2 EDI is more advanced than that of level 2 RO + level 2 EDI, which saves the investment of level 1 RO equipment and the operating cost of level 1 RO equipment.
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