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          1. Sewage treatment technology : the main method of ozone in water treatment




            Sewage treatment technology articles: the main method of ozone in water treatment

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            Ozone (O3) wastewater treatment technology was applied to water treatment in 1905. With the advancement of related technologies, the cost of ozonation has been reduced, and it is generally considered to be a promising water treatment method. Ozone has extremely strong oxidizing properties, and there are no definite conclusions on its oxidation mechanism. It is generally believed that the main source is ozone-dissociated OH radicals. It is the most active oxidant among known oxidants that occur in water. It is easy to pass. Basic reactions oxidize various types of organics. OH radicals can also form secondary oxidation groups with other substances such as benzene derivatives. It can also oxidize carbonate or bicarbonate ions to carbonate or bicarbonate which can act as a tertiary oxidant. Ozone molecules can Dissociates into the perhydroxy group of the peroxidant.

            Sewage treatment technology articles: the main method of ozone in water treatment


            The main process of ozonation
            There are many types of ozone (O3) water treatment processes, mainly including the following types: ozone (O3) + biological activated carbon method, ozone (O3) + coagulation method, ozone (O3) + activated carbon adsorption method, ozone (O3) + activity Sludge method, ozone (O3) + membrane treatment method, ozone (O3) + ultrasonic method.



            ?Sewage Treatment Technology: Main Methods of Ozone in Water Treatment 1
            The main process of the ozone (O3) + biological activated carbon method is: firstly add ozone to the water, and its strong oxidizing property will break the complex organic molecules into small molecules, which is easy to biodegrade and increase the dissolved oxygen concentration in the water. Then it enters the biological activated carbon device, and the easily degradable organic matter is enriched by the activated carbon, and is oxidized and decomposed into CO2 and H2O by aerobic microorganisms. The characteristic of this process is that the ozone pretreatment improves the biodegradability of wastewater, the enrichment of organic matter and the enrichment of oxygen increase the biochemical reaction speed; the biodegradation of organic matter on activated carbon can restore the activated carbon adsorption performance.

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            2
            The ozone (O3) + coagulation method is based on the strong destructive force of ozone (O3) on hydrophilic substances. When the hydrophilic substance is converted to hydrophobic, the coagulation and precipitation effect will be greatly improved.


            3
            The ozone (O3) + activated carbon adsorption method refers to: due to the small pores of activated carbon, the adsorption of macromolecular substances is restricted. Ozone (O3) can destroy the molecular structure of substances, form small molecules, and increase the adsorption capacity of activated carbon.

            4
            The ozone (O3) + activated sludge method works like the biological activated carbon method, and its purpose is to improve the biodegradability of wastewater.


            5
            Ozone (O3) + membrane treatment method. Ozone (O3) is commonly used in post-treatment of ultrafiltration (UF).


            6
            Ozone (O3) + ultrasonic treatment method, the increase of ultrasonic power can increase the reaction speed, the increase of ozone (O3) penetration can deepen the degree of biological reaction, and improve the removal rate of complex organic matter.


            Sewage treatment technology articles: the main method of ozone in water treatment

            Ozone unit treatment is mainly catalytic oxidation
            Ozone unit treatment is mainly catalytic oxidation methods, such as alkali-catalyzed oxidation, photocatalytic oxidation and heterogeneous catalytic oxidation. Specific treatment methods are: ozone (O3) / H2O2, ozone (O3) / UV (ultraviolet light), ozone (O3 ) / Solid catalysts (metals and their oxides, activated carbon, etc.). From the reaction mechanism: it belongs to alkali-catalyzed ozonation, it belongs to photocatalytic ozonation, and it belongs to heterogeneous catalytic ozonation.


            Sewage treatment technology articles: the main method of ozone in water treatment
            PART

            01

            The way of alkali-catalyzed ozonation reaction is: through OH-catalysis, -OH radicals are generated, and then organic compounds are oxidized and decomposed. The process of -OH group generation is as follows:

            O3 + OH → O2 + HO2, O3 + O2 → O3 + O2, O3 + H + → HO3 → OH + O2


            ?Sewage treatment technology articles: the main method of ozone in water treatment
            PART

            02

            The way of alkali-catalyzed ozonation reaction is: through OH-catalysis, -OH radicals are generated, and then organic compounds are oxidized and decomposed. The process of -OH group generation is as follows:

            O3 + OH → O2 + HO2, O3 + O2 → O3 + O2, O3 + H + → HO3 → OH + O2


            ?Sewage treatment technology articles: the main method of ozone in water treatment
            PART

            03

            When the photocatalytic ozonation method is used to treat hard-to-degrade organic wastewater, some hard-to-degrade organics are exposed to ultraviolet light to increase their energy levels, are in an excited state, and undergo hydroxylation with OH groups to generate new materials that are easily biodegradable.


            ?Sewage treatment technology articles: the main method of ozone in water treatment
            PART

            04

            Heterogeneous catalytic ozonation is a new technology developed in recent years. The purpose of metal catalysis is to promote the decomposition of ozone (O3) to generate active -OH radicals to strengthen its oxidation. Common catalysts are CuO, Fe2O3, NiO, TiO2, Mn, etc.
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