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RO membrane is a liquid / liquid separation process that uses a dense semi-permeable membrane, highly permeable to water. A pressurized feed solution is passed over one surface of the membrane. As long as the applied pressure is greater than the osmotic pressure of the feed solution, “pure” water will flow from the more concentrated solution to the more dilute through the membrane to desalt, purify, concentrate and separate the solution. RO membrane has MWCO under 100, which capturing pollutions, like inorganic salt, sugar, amino acid, BOD, COD and so on.
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At present, RO membrane has applied generally in the water treatment field, such as water desalting, water pollution control, pure water manufacture, waste water treatment. Comparing with the traditional water treatment equipment, RO system have the advantages, such as, easy operation, high automatic performance, small installation place, no any pollution.
Deionized water, also known as demineralized water (DI water), is water that has had its mineral ions removed. DI water could have an output electrical conductivity of not more than 1 µS/cm. Deionization is a physical process which uses specially-manufactured ion-exchange resins which bind to and filter out the mineral salts from water. Because the majority of water impurities are dissolved salts, deionization produces a high purity water that is generally similar to distilled water, and this process is quick and without scale buildup. DI water is suitable for many applications, including automotive, appliances, hand-pieces, laboratory testing, laser cutting etc.
EDI (Electro-de-ionization) utilizes an electrode to ionize water molecules and separate dissolved ions (impurities) from water. It differs from other water purification technologies in that it is done without the use of chemical treatments and is usually a tertiary treatment to reverse osmosis (RO). EDI could produce ultra-pure water up to 15MΩ•cm resistivity. Hydrotech’s EDI system provides key advantages over traditional ion-exchange processes,
- Eliminate expensive and hazardous chemicals used in ion-exchange resin regeneration
- Reduce energy and operating expenses
- Reduce the facility size requirement
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