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Pure Water Treatment Technology And Processing Principle Analysis (2)

Jul 21, 2017

4, ion exchange (IX) pure water treatment

Ion exchange of pure water equipment is through the anion, cation exchange resin on the water in a variety of yin and cation replacement of a traditional water treatment process, Yin, cation exchange resin according to different proportions can be composed of ion exchange bed system, ion exchange (Complex bed) system, and mixed bed (complex bed) system is usually used in reverse osmosis and other water treatment process used to prepare ultra-pure water, high purity water terminal process, he Is currently used to prepare ultra-pure water, high purity water can not be replaced one of the means. The effluent conductivity can be less than 1uS / cm below the effluent resistivity of 1MΩ.cm above, according to the different water quality and use requirements, the water resistivity can be controlled between 1 ~ 18MΩ.cm. Is widely used in electronics, electricity, ultra-pure water, chemical, electroplating ultra-pure water, boiler water supply and pharmaceutical ultra-pure water and other industries ultra-pure water, high purity water on the preparation.

Ca2 +, Mg2 + and the like are replaced by the active groups of the cationic resin, and the anions such as Ca (HCO3) 2, MgSO4 and the like are dissolved in the exchange resin layer, and the anions HCO3-, SO42- and the like Is replaced by the active group of the anion resin, so that the water is purified. Such as the high content of bicarbonate in the raw water, should be in the middle of the cation exchange column, remove the gas column, remove the CO2 gas, reduce the load of the bed.

5, UV (UV) ultra-pure water treatment

The main process of cell propagation is: long chain of DNA open, open each long-chain long adenine unit to find thymidine units linked together, each long chain can be copied with just another long chain of the same chain , To restore the original DNA before the division, a new cell base. And the wavelength of 240-280nm UV can break the DNA production of protein and replication capacity, which wavelength of 265nm ultraviolet radiation on the bacterial virus the strongest. Bacteria virus DNA, RNA damage after its ability to produce protein and reproductive capacity have been lost. Due to bacteria, the virus life cycle is very short, can not reproduce the bacteria, the virus will quickly die. UV is to prevent the survival of microbes of tap water to achieve sterilization, disinfection of the treatment effect.

Currently able to output sufficient UV intensity (UVC) strength for engineering disinfection only artificial mercury (alloy) light source. UV lamp is made of quartz glass, mercury lamp according to the lamp after the mercury vapor pressure and the different UV output intensity is divided into three kinds: low-pressure low-intensity mercury lamp, medium-pressure high-intensity mercury Lamp and low pressure high strength mercury lamp.

The bactericidal effect is determined by the dose of the radiation accepted by the microorganism and is also affected by the output energy of the UV, which is related to the type of light, the light intensity and the use of the time. As the lamp ages, it will lose 30% to 50% The

(J / m2) = irradiation time (s) × UVC intensity (W / m2) The greater the irradiation dose, the more the disinfection efficiency is, the higher the amount of ultraviolet radiation, the amount of ultraviolet radiation required to reach a certain bacterial inactivation rate High, due to equipment size requirements, the general exposure time is only a few seconds, therefore, the lamp UVC output intensity has become a measure of ultraviolet light disinfection equipment performance of the most important parameters.

6, ultrafiltration (UF) pure water treatment

Ultrafiltration technology is a widely used in water purification, solution separation, concentration, and from the waste water extraction of useful substances, waste water purification and recycling areas of high-tech. Features are simple to use, without heating, energy saving, low pressure operation, the device covers an area of small.

Ultrafiltration (UF) pure water treatment principle: ultrafiltration is a sorting principle of separation, pressure-driven membrane separation process, the filtration accuracy of 0.005-0.01μm range, can effectively remove the particles in water, colloid , Bacterial mats and macromolecular organic substances. Can be widely used in the separation of substances, enrichment, purification. Ultrafiltration process without phase conversion, room temperature operation, the separation of heat-sensitive substances is particularly appropriate, and has good temperature, acid and alkali and oxidation resistance, can be below 60 ℃, pH 2-11 under the conditions of long-term continuous use The

Hollow fiber ultrafiltration membrane is the most mature and advanced form of ultrafiltration technology. Hollow fiber diameter 0.5-2.0mm, diameter 0.3-1.4mm, hollow fiber tube wall covered with micropores, pore size to retain the molecular weight of the material, the molecular weight cut up to several thousand to several hundred thousand. Raw water in the hollow fiber outside or cavity pressure flow, respectively, constitute the external pressure and internal pressure. Ultrafiltration is a dynamic filtration process, the material can be removed with the concentration of small exclusion, not to block the membrane surface, long-term continuous operation.

7, EDI pure water treatment

EDI ultra-pure water treatment equipment works: electric deionization (EDI) system is mainly under the action of the DC electric field, through the partition of the water in the dielectric ion to move, the use of exchange membrane on the choice of ions through the role of water quality A scientific water treatment technology for purification. Electrode between a pair of electrodes, usually by the film, the sun film and the partition (A, B) alternately arranged to form a thick room and light room (that is, cation can be through the sun, the anion can be through the yin membrane). The cation in the shallow chamber migrates through the yolk membrane and is trapped in the film in the thick chamber. The anions of the water migrate to the positive film in the direction of the positive film, which is retained by the sun film in the thick chamber, so that the number of ions in the water is gradually reduced, Become fresh water, and the strong room of the water, due to the strong room of the cation and the influx, the dielectric ion concentration continues to rise, and become concentrated water, so as to achieve the purpose of desalination, purification, concentration or refining.

Advantages of EDI ultra-pure water treatment equipment:

1, no acid and alkali regeneration: in the mixed bed resin need to use chemical acid and alkali regeneration, and EDI is to eliminate the handling of these harmful substances and heavy work. Protect the environment.

2, continuous, simple operation: in the mixed bed due to each regeneration and changes in water quality, so that the operation process becomes complicated, and EDI production process is stable and continuous, water quality is constant, no complicated The operation of the program, the operation greatly simplified.

3, reducing the installation requirements: EDI system and considerable treatment of water compared to the mixed bed, there is a smaller volume, it uses modular structure, according to the height of the site and the static structure of the generation. Modular design, EDI in the production work can be easily maintained.

8, ozone sterilization ultra-pure water treatment

Ozone (O3) disinfection principle is: ozone at room temperature, atmospheric pressure molecular structure is unstable, and soon break into oxygen (O2) and a single oxygen atom (O); the latter has a strong activity, the bacteria have a pole Strong oxidation, to kill, the excess oxygen atoms will be re-combined into ordinary oxygen atoms (O2), there is no toxic residues, so that pollution-free disinfectant, it not only for a variety of bacteria (including hepatitis Viruses, E. coli, green bacillus and bacteria, etc.) have a strong ability to kill, but also very effective to kill the moxycin.

1, ozone sterilization mechanism and process belong to the biochemical process, the decomposition of bacteria within the oxidized glucose necessary glucose oxidase.

2, directly with the bacteria, the virus occurs, the destruction of its organelles and ribonucleic acid, decomposition of DNA, RNA, protein, lipids and polysaccharides and other macromolecules, so that the metabolism of bacteria production and reproduction process to damage.

3, infiltration of membrane tissue, invading the cell membrane in the outer membrane lipoprotein and the internal lipopolysaccharide, so that cells occur translucent, resulting in cell death. And the death of bacteria in the body, parasitic bacteria, parasitic virus particles, phage, mycoplasma and pyrogen (bacterial and viral metabolites, endotoxin) and other dissolved degeneration.