Ozone oxidation principle and related processes are introduced

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With the rapid development of industry, the complex organic matter discharged by enterprises has gradually increased, and the state of water environment is worrying. "Clear water and green mountains are gold hills and silver mountains", therefore, it is important to strengthen the comprehensive management of water environment. At present, biological methods are used in wastewater treatment, but the highly stable and difficult to degrade pollutants are difficult to be removed by biological methods, so it is particularly critical to use a more effective non-biological technology - ozone oxidation technology to treat these pollutants.

In the past ten years, ozone oxidation technology is no longer solely applied to wastewater treatment, because of its limitations, such as the inability to oxidize chloroform refractory organic matter, nor the complete oxidation of macromolecular organic matter into small molecules of carbon dioxide and water. Therefore, the research of ozone combined technology is gradually emerging. In addition, catalytic ozone oxidation process has also been applied in the treatment of nitrobenzene and leachate.

There are two main oxidation mechanisms of ozone: direct oxidation mechanism and indirect oxidation mechanism. In direct oxidation, pollutants in wastewater react directly with ozone at a slower rate and with selectivity. In indirect oxidation, ozone is decomposed into strong oxidizing •OH in water, which indirectly oxidizes pollutants in water with fast reaction speed and no selectivity, which can trigger chain reaction, increase the polarity of organic matter, and improve biodegradability.

At present, there are many kinds of combined ozone oxidation processes. Including activated carbon - ozone oxidation, air floatation - biological contact oxidation - ozone oxidation, ozone oxidation -BAF, ozone -A2O/AO, ozone oxidation -MBR, flocculation precipitation - ozone oxidation, coagulation - biological contact oxidation - ozone oxidation, three-effect evaporation - ozone oxidation - biochemical and ozone oxidation - ultrasonic processes. These processes target different types of wastewater and improve the treatment effect through synergies.

Among them, the ozonation-ultrasonic process uses the cavitation and mechanical effects of ultrasonic waves to increase the mass transfer and decomposition of ozone, thereby increasing the indirect ozone oxidation rate. The ozone-BAF process has achieved good results in the treatment of oily wastewater, and the effluent COD and ammonia nitrogen meet the environmental standards of surface water. The three-effect evaporation-ozonation-biochemical process is suitable for the treatment of high-salt and high-chroma wastewater such as spice production wastewater.

In addition, other combined ozonation processes also show good application prospects in the treatment of refractory organic wastewater and high-salt heavy metal wastewater. The continuous development and optimization of these processes provides more efficient and environmentally friendly solutions for wastewater treatment.

As for the coagulation method in printing and dyeing wastewater treatment technology, it is usually combined with ozone oxidation technology, through the addition of coagulant, change the nature of suspended matter in the wastewater, improve the sedimentation rate of suspended particles, so as to further remove pollutants in the wastewater. This combined treatment method shows a good effect in the treatment of printing and dyeing wastewater, and provides a new way for the treatment of printing and dyeing wastewater.

In summary, ozone oxidation technology and its combined process have a wide range of application prospects in the field of wastewater treatment, and are of great significance for improving water environment and realizing sustainable development.

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