Industrial wastewater treatment refers to the appropriate treatment and reuse of water used in industrial production processes for production or proper discharge from the factory, including the supervision of production water and measures taken to facilitate sewage treatment. Industrial wastewater treatment usually involves the removal of chemical oxygen demand, suspended solids, sulfates, petroleum, hexavalent chromium, lead, cadmium, etc. Wastewater treatment equipment is a type of industrial equipment that can effectively solve the domestic sewage and industrial wastewater in urban areas, avoiding direct inflow of sewage and pollutants into water bodies. It is of great significance for improving the ecological environment, enhancing urban quality, and promoting economic development. Below, the editor will talk about advanced oxidation technology for industrial wastewater treatment. Let's learn more together.

Advanced oxidation technologies in industrial wastewater treatment include ozone oxidation, Fenton method, ultrasonic oxidation, supercritical water oxidation, electrochemical method, and microwave-assisted oxidation.

1. Ozone oxidation method

Ozone itself will react with different catalysts, and hydroxyl groups will be generated during the reaction. Hydroxyl groups have strong oxidation ability and have obvious fading and deodorization effects when used in industrial wastewater treatment. After treating industrial wastewater, ozone is also easy to decompose and will not cause secondary pollution to the environment. Currently, many paper mills use ozone oxidation method with a dosage of only 14g/min, and a significant effect can be achieved within 30 minutes. The oxidation effect will be enhanced with the increase of ozone dosage and reaction rate.

2. Fenton method

The Fenton method is currently a research hotspot in advanced oxidation technology internationally. The technical principle is to use hydroxyl radicals generated by metal ions such as divalent iron to destroy the organic structure of pollutants, and then decompose them into harmless and non-toxic substances such as water or CO2, achieving the harmless effect of industrial wastewater treatment.

3. Ultrasonic oxidation method

Ultrasound itself has high kinetic energy and frequency, as well as fast shooting ability, which can quickly degrade pollutants, especially organic matter, and is widely used. When applying ultrasonic oxidation method, the frequency range of ultrasonic waves is generally 16kHz~1kHz. In its solution, high temperature and high pressure are generated, which in turn produces high concentrations of oxidizing substances and can also produce supercritical water. When using ultrasonic oxidation to degrade compounds, there are three methods, including free radical oxidation, supercritical water oxidation, and high-temperature pyrolysis oxidation. Based on these methods, harmful substances in industrial wastewater can be converted into non-toxic and harmless components such as CO2 and water, which have the characteristics of high efficiency, zero pollution, and strong operability. They are relatively environmentally friendly and have a bright application prospect. On the other hand, the ultrasonic oxidation method can not only be used alone, but can also be used in conjunction with electrochemical methods, such as in combination with ozone, which can make ozone decomposition more rapid and sufficient. However, due to the immature technology of ultrasonic oxidation, there are still issues with the design of ultrasonic reaction vessels and the effectiveness of ultrasonic cavitation, which require further research.

4. Supercritical water oxidation method

Supercritical water oxidation method has a shorter application time compared to other advanced oxidation technologies, but it is an extremely advanced sewage treatment method. The principle of supercritical water oxidation method is that organic pollutants in industrial wastewater can be directly dissolved in supercritical water, known as the oxidizing organic matter medium, thereby creating an environment conducive to organic matter oxidation and reflection, promoting the direct conversion of organic matter into water and CO2 after reflection. Furthermore, the supercritical water oxidation method can also degrade organic matter in industrial wastewater, more efficiently remove toxic and harmful substances, and will not cause secondary pollution problems.

5. Electrochemical method

The principle of electrochemical method is to decompose pollutants by OH • generated by catalytic active electrode materials in electrode reactions. The differences in oxidation principles also divide electrochemical methods into three forms, including negative electrode oxidation, anodic oxidation, and synergistic effect oxidation of the anode and cathode. Negative electrode oxidation generates H2O2 or Fe2 through moderate electrode potential based on reduction, and then fuses with additional reagents to indirectly degrade organic matter, resulting in lower efficiency; Anodizing is the application of active anode materials in electrochemical reactors to directly cause oxidation and electrochemical corrosion of pollutants; The synergistic effect of yin and yang in oxidation is based on the synergistic two processes, and a more reasonable chemical reactor is designed to improve treatment efficiency.

6. Microwave assisted oxidation method

Weibo magnetic field can cause molecules to collide at high speeds, resulting in thermal effects, changing thermodynamic functions, and reducing activation energy. In addition, magnetic materials already have strong adsorption ability, which can act as induction catalysts for chemical changes in surface hotspots reflected by microwave radiation. But this technology has a high cost and is currently not widely used.

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