With the aggravation of water pollution and the improvement of water quality standards, various oxidation technologies have emerged in response to the shortage of conventional treatment technologies, and ozonization technologies are gradually attracting people's attention.The ozone technology research in 1886 by the French first, ozone in the late 1980 s began to use, strong ability of ozone oxidation, oxidation reduction potential for 2.07 V, second only to fluorine in alkaline solution.It can be a variety of oxide compounds, but also has the consumption of small, fast response, don't produce the advantages, such as sludge was successfully applied to drinking water depth treatment, aquaculture water and swimming pool water treatment and expand to the mineral water production and other fields.
A large number of studies and applications have proved that ozone has a strong ability to decolor, smell and taste.It can improve the sensory index of water effectively.
The chromaticity of water is mainly caused by dissolved organic matter, suspended colloids and particulates, among which the surface color caused by light absorption and scattering is easy to be removed, and the true color caused by dissolved organic matter is difficult to be removed.The characteristic structures of chromogenic organic compounds are double bonds and aromatic rings, which are humic acid and fulvic acid.The true color of ozone is removed by the reaction with unsaturated functional groups and the destruction of carbon and carbon double bonds.At the same time, ozone can oxidize iron, manganese and other inorganic color ion difficult solution;The microflocculation effect of ozone also contributes to the coagulation of organic colloids and particulates and the removal of colorants through particle filtration.
Water smell and is mainly composed of humic organic matter, such as algae and fungi, actinomycetes and excessive caused by chlorine, and now find out the main odor thing are rotten soil element, 2 - methyl isopropyl borneol, 2 minus 2 - chemical back to fragrant ether, etc.In general, the threshold value of heterodox in water is only 0.005 ~ 0.01.Ozone has a very high efficiency in odor removal. Generally, the dosage of 1 ~ 3 mg/L can reach the specified threshold.
Ozone as a strong oxidizer, it has a strong disinfection and inactivation capacity, especially effective for general bacteria, coliform bacteria, viruses and so on.Its bactericidal ability is dozens to hundreds of times better than that of chlorine series disinfectants. The order of sterilization ability of various conventional disinfectants is:
When ozone concentration is 0.01 mg/L, 1 minute following contact time can kill e. coli in the water, for drinking water, the optimum amount of ozone for 1-4 mg/L , if if only 99.9% of the bacteria and virus inactivation the contact time of about 10 to 12 minutes.After the 1970s, people gradually realized that chlorine disinfection would produce the harmful by-product THM.The application of ozone instead of chlorine for disinfection has been greatly increased.At the same time, studies have shown that: the typical harmful chlorination disinfection by-products (DBPs) mainly for 3 bittern armour hospital (THMs) and halogen acetate (HAAs), ozonation through two ways to control DBPs: one is the direct removal of DBPs precursors material;The second is to transform the precursor material, which is conducive to the subsequent process of synergistic removal.
Algae problems are common in water treatment practices around the world.High content of algae will affect coagulation and precipitation and increase coagulation dose.Clog the filter tank, shorten the filter cycle, stink and produce algal toxins, and chlorate to form chlorination disinfection by-products, and reduce the safety of drinking water.One of the effects of ozone oxidation is to dissociate algal cells, and the other is to kill algae, making the dead algae easy to be removed by subsequent processes.The amount of ozone can directly influence the dissolution rate of algal cells.
Ozone can make the state of the organic matter of polymer iron iron compounds (corrosion) rapid oxidation and precipitation, combined with sand filter method can effectively remove the iron and manganese removal and ozone don't need often required high PH value, even in the case of low PH 0.5 such complete oxidation can occur.Ozone is also a simple and effective method to remove hydrogen sulfide and sulfide from water.
All in all, the ozone oxidation technology is used to decolor deodorization and to control the chlorination by-products, remove algae and algae toxin, coagulation, disinfection sterilization, preliminary or conversion of organic pollutant removal, which have been broadly applied in many water and residents' drinking water .
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