EDI Ultrapure Water Systems
Water Requirements
Secondary reverse osmosis purified water Inlet conductivity should be ≤ 5μs/cm
Treatment effect
Produced water resistivity: ≥ 15MΩ
Working environment parameters
temperature:5-35℃ pH:6.0~9.0
Water production
0.5-50(m3/H)
Inlet pressure
≤ 0.6MPa
Operation Mode
Fully automatic
Introduction
Ultrapure water EDI device is a combination of electrodialysis and ion exchange with each other in addition to the salt of the new process, the English abbreviation EDI, the process takes the electrodialysis and ion exchange of the two strengths, to make up for the shortcomings of each other, that is, the use of ion exchange can be the depth of the desalination of the electrodialysis polarization to overcome the desalination of the salt is not complete, and the use of electrodialysis polarization of water ionization occurs to produce H+ and OH- to achieve the resin’s self-regeneration to overcome the defects of the resin Defects of resin failure, and with selective resin membrane to accelerate the removal of ion mobility, so as to achieve the purpose of water purification.
Workflow Diagram
Workflow Diagram
EDI technology is a perfect combination of electrodialysis and ion exchange technology. When fresh water enters the fresh water chamber, the ions in the fresh water and the resin undergo ion exchange and detach from the water; the exchanged ions are subjected to electric migration, the cations migrate to the cathode through the cation exchange membrane, and the anions migrate to the anode through the anion exchange membrane and enter the concentrated water chamber so as to be removed from the fresh water. After the ions enter the concentrated water chamber, because the cations can not pass through the anion exchange membrane, so it will be retained in the concentrated water chamber, similarly, the anions can not pass through the cation exchange membrane, be retained in the concentrated water chamber, so that the anions and cations will be discharged from the membrane block with the concentrated water flow; so that the ions in the freshwater are constantly removed, the purity of the freshwater will be more and more high. Water molecules are dissociated into H+ and OH- under the action of electricity, and H+ and OH will make the consumed anode/negative resin regenerate continuously. The oxidation reaction at the anode produces O2and Cl2, and the reduction reaction at the cathode produces H2.
Product Features
▪ Small footprint, omitting mixed bed and regeneration device.
▪ Continuous and stable water production, high quality of water, up to 18MΩ-cm, reaching the target of ultrapure water.
▪ Low running cost, no need for acid and alkali regeneration, saving material costs.
▪ The running cost of EDI is only electricity consumption, water consumption and so on, saving the cost of acid
and alkali consumption, regeneration water, waste water treatment and sewage discharge.
▪ In terms of water consumption, the concentrated water of EDI can be directly returned to the front-end
treatment, saving water.
▪ Environmental benefits are significant, increasing the safety of operation.
Technical Parameter
| Model | Output of modules (t/h) | Number of modules | Water production (t/h) | Inlet pipe diameter (DN) | Outlet pipe diameter (DN) | Operating pressure | Recovery rate % | Output water quality (MΩ) |
| LF-EDI-001 | 1 | 1 | 1 | 20 | 20 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-003 | 3 | 1 | 3 | 25 | 25 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-005 | 5 | 1 | 5 | 32 | 32 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-010 | 5 | 2 | 10 | 50 | 40 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-020 | 5 | 4 | 20 | 65 | 65 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-030 | 5 | 6 | 30 | 80 | 80 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-040 | 5 | 8 | 40 | 80 | 80 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-050 | 5 | 10 | 50 | 100 | 100 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-060 | 5 | 12 | 60 | 100 | 100 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-080 | 5 | 16 | 80 | 125 | 125 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-100 | 5 | 20 | 100 | 125 | 125 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-120 | 5 | 24 | 120 | 150 | 150 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-150 | 5 | 30 | 150 | 150 | 150 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
| LF-EDI-200 | 5 | 40 | 200 | 200 | 200 | ≤ 0.6MPa | ≥ 90 | ≥ 10(15) |
Application
① Power plant chemical water treatment
② Electronics, semiconductor, precision machinery industry ultrapure water
③ Pharmaceutical industry process water
④ Food, beverage, drinking water preparation
⑤ Desalination of seawater and brackish water
⑥ small-scale pure water station, group drinking pure water
⑦ Fine chemical industry, water for advanced disciplines
⑧ other industries need high purity water preparation
