What is the basic principle of reverse osmosis water treatment
Membrane separation technology is currently the most excellent and most environmentally friendly, energy-saving and reasonable membrane separation equipment. The basic principle is that under the effect of higher than the osmotic concentration of the aqueous solution, other chemical substances cannot pass through the semi-permeable membrane to remove this chemical substance and water. Because the membrane diameter of RO reverse osmosis membrane is very small (only about 10A), it can reasonably remove the dissolved acid salt, colloidal solution, microbial species, and organic compounds in the water (the sludge load reaches 97-98%). The system software has the advantages of good water body, low energy consumption, zero pollution, simple processing technology, and simple actual operation.
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Membrane separation technology is generally used to talk about sea and brackish water; to solve the softening of water; to treat wastewater and its purification, concentration, and separation of food, pharmaceuticals, and chemical industries. In addition, the application of membrane separation technology to the solution of pre-demineralization has also achieved good practical results, which can relieve the load of ion exchange epoxy resin by more than 90%, and the amount of epoxy resin rebuilder can also be reduced by 90%. %. Therefore, it not only saves costs, but also benefits the ecological environment. Membrane separation technology can also be used to remove particles, organic chemicals, and colloidal solutions in the water, and has excellent effects on alleviating the environmental pollution of ion exchange epoxy resins and increasing the service life.
RO reverse osmosis is the most commonly used desalination technology in the production of industrial pure water at this stage. Its separation target is the range of positive ions in the aqueous solution and the content of hundreds of organic compounds. RO reverse osmosis (RO), Ultrafiltration (UF), microporous membrane filtration (MF) and electrodialysis (ED) technology are all attributed to membrane separation equipment.
The demineralization rate of the system software of the reverse osmosis device is generally 98-99%. Such a demineralization rate can meet the requirements in most cases. In the electronics industry, high-pressure heating furnace replenishment, and certain pharmaceutical industry fields, The requirement for purified water is likely to be higher. At this time, the unipolar reverse osmosis device cannot meet the requirements.
Infiltration conditions are common in nature. For example, if you put a loofah in salt water, the loofah will shrink due to lack of water. The whole process of the water in the loofah entering the salt solution is the whole process of infiltration. If a plastic film that only water can pass through is used to partition a reservoir into two parts, pure water and saline water are introduced on both sides of the diaphragm to the same aspect ratio. After a while, it will be noticed that the level of pure water has decreased, while the level of saline has increased. Everyone refers to the condition that water is transferred to the saline through this diaphragm as the infiltration condition. The rise of the salt water level is not endless, and a certain point of balance will be achieved at a certain aspect ratio. At this time, the working pressure implied by the liquid level difference on both sides of the diaphragm is called the osmotic concentration. The size of the osmotic concentration is immediately related to the concentration of the brine.
Reverse osmosis water treatment has the following advantages: continuous operation, stable commercial water; no need to rebuild with strong acid and alkali; not easy to shut down due to rebuild; save recoil and clean tap water; increase production rate to create ultra-pure water system (yield rate Can reach 95%); no reclaimed waste water, no need for wastewater treatment equipment; no need for strong acid and strong alkali storage and strong acid and strong alkali diluent transportation equipment; reduce the total construction area of the production workshop; the application can be trusted to prevent employees from touching the strong acid and alkali; reduce operation And maintenance costs; convenient installation and operation, and cheap installation costs.
In the past 30 years, RO reverse osmosis, electrodialysis, ultrafiltration and membrane filtration have been used in industrial production. The development trend is rapid. In the manufacturing and processing technology of semiconductor materials and integrated circuit chips, food and pharmaceutical industries, generally Ro reverse osmosis is used for desalination in the production of industrial pure water, ultrafiltration is mostly used as a post-treatment process for water treatment system software, and membrane filtration is used for pre-treatment and post-treatment processes for sewage treatment to filter particles and Germs.