Application of reverse osmosis membrane technology in pure water manufacturing
October 10, 2020
Application of reverse osmosis membrane technology in pure water manufacturing
Membrane separation technologies used in pure water manufacturing mainly include electrodialysis (ED), reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF) and microfiltration (MF). Its working principle and the name of membrane module commonly used in pure water manufacturing are edronufmf micropore pore size 5-50 ang15-85 ang50-1000 (1 μ m) 0.03-100 μ m working principle ion selective permeability.
1. Preferential adsorption capillary theory
2. Hydrogen chain theory
3. The diffusion theory is the same as that of the left filtration membrane, and the same as the left filtration to remove inorganic salt ions
Remove inorganic salt ions, organics, microorganisms, colloids, heat sources, viruses, etc. remove divalent and trivalent ions, organics with M > 100, and microorganisms, colloids, heat sources, viruses, etc.
Compared with the traditional water treatment technology, membrane technology has the advantages of simple process, convenient operation, easy automatic control, low energy consumption, no pollution, high impurity removal efficiency and low operation cost. In particular, the combination of several membrane technologies and other water treatment processes, such as quartz sand filtration, activated carbon adsorption, degassing, ion exchange, UV sterilization, etc., are used to remove water It provides an effective and reliable means to meet the needs of the growing electronic industry for high-purity water. Only by applying a variety of membrane technologies can qualified and stable high-purity water be produced, and large-scale, super large-scale and very large-scale integrated circuits (LSI, VLSI, ULSI) can be produced, so as to make computers, radars, communications, automatic control and other modern electricity The development and application of sub industry can be realized.
It is worth mentioning that when the salt content of raw water is greater than 400mg / L, after the RO ion exchange process is adopted in the desalting process of pure water manufacturing, the acid and alkali can be saved by about 90%, and the periodic water yield of the ion exchange column can be increased by about 10 times. It has been proved that the operation cost and water production cost of pure water manufacturing can be reduced, and the labor intensity of workers can be reduced It can reduce the pollution to the environment and improve the quality of pure water for a long time.
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