(1) Reverse osmosis technology
Technical principle
When the same volume of brine and pure water are placed on both sides of the semi-permeable membrane (Figure 1), pure water molecules will pass through the membrane to the side of the brine (Figure 2) until a dynamic equilibrium is reached. At this point, the pressure difference across the semipermeable membrane is the osmotic pressure. If the external pressure applied to the brine side is greater than the osmotic pressure, the water molecules in the brine will overcome the osmotic pressure and permeate through the membrane to the pure water side (Figure 3), thereby achieving the purpose of water purification.
technical features
Reverse osmosis uses pressure as the driving force. The reverse osmosis membrane can only permeate water but is selective for solutes, so as to remove various inorganic substances, organic substances, and microorganisms in the water to achieve the purpose of purifying water. It has the advantages of high water quality, low operating cost, no pollution, convenient operation, reliable operation, etc. It has been widely used in many industries such as medicine, electronics, chemical industry, food, and seawater desalination. Reverse osmosis technology has become the preferred water treatment technology in modern industry.
(2) Electrodeionization technology
Technical principle: term
Electrodeionization technology is a new type of ultrapure water preparation technology gradually developed in the 1990s in the world, which is a revolutionary progress in the history of pure water production technology. This technology cleverly integrates electrodialysis technology and ion exchange technology. Through the selective permeation of anion and cation exchange membranes and the exchange of ions by ion exchange resins, the directional migration of ions is realized under the action of a DC electric field, thereby The deep desalination of water is completed, and at the same time, the hydrogen ions and hydroxide ions generated by the electrolysis of water regenerate the ion exchange resin. Therefore, ultrapure water can be continuously produced without acid-base chemical regeneration. This technology has the advantages of professional technology, simple operation and no pollution to the environment, and has become the third generation of ultrapure water preparation technology.
Technical Features:
• Continuous production of ultrapure water with stable water quality;
• No need for acid and alkali regeneration, saving acid and alkali consumption and corresponding storage, transportation and regeneration facilities;
• No regeneration of sewage, clean process, no need for sewage treatment facilities;
• Avoid chemical harm to operators;
• Compact structure, small footprint;
• Simple operation and low labor intensity.
Application fields:
• Electronics industry: preparation of ultrapure water and cleaning water for integrated circuits in the semiconductor industry;
• Electric power industry: preparation of high-pressure boiler feed water;
• Pharmaceutical industry: preparation of medical purified water;
• Chemical industry: desalination and purification of solutions;
• Experimental analysis: preparation of ultrapure water for analysis.
