Currently, many repair shops are located in residential areas, and the primary source of pollution is paint and solvent emissions. As public awareness of environmental protection and health continues to rise, complaints against repair shops remain stubbornly high. There is an urgent need for a series of environmentally friendly equipment to effectively treat these pollutants, ensuring the smooth operation of the entire repair shop. We have therefore timely introduced a photocatalytic exhaust gas treatment system.

The general process of photocatalytic exhaust gas treatment involves introducing odorous gases into this purification device via an exhaust ventilation system. The purification device then employs high-energy UV ultraviolet light beams and ozone to synergistically decompose and oxidize the odorous gases, breaking them down into lower-molecular-weight compounds, water, and carbon dioxide, which are subsequently discharged outdoors through exhaust ducts. From a theoretical standpoint, photocatalytic exhaust gas treatment technology utilizes high-energy, high-ozone UV ultraviolet light beams to split oxygen molecules in the air, generating free oxygen—also known as active oxygen. Since free oxygen carries an imbalance of positive and negative electrons, it readily combines with other molecules, thereby producing ozone. The reactions proceed as follows: UV + O₂ → O⁻ + O⁎ (active oxygen); O⁺ + O₂ → O₃ (ozone). As is well known, ozone possesses an extremely strong oxidizing effect on organic substances, making it highly effective at instantly eliminating odorous gases and other irritating odors. At the same time, the high-energy UV light beams break the molecular bonds of bacteria present in the odorous gases, disrupting their nucleic acids (DNA). Subsequently, ozone further oxidizes these disrupted bacterial components, thoroughly achieving the goals of odor removal and bacterial inactivation.

This technology boasts advantages such as **eliminating odors without adding any chemicals, high adaptability, stable and reliable continuous operation, low operating costs, compact equipment footprint, and lightweight design.** Adopting internationally **advanced technological concepts, it can thoroughly decompose toxic and harmful substances in industrial exhaust gases, achieving **excellent deodorization and purification effects.** After decomposition, the industrial exhaust gases can be completely discharged in a harmless manner, without generating secondary pollution, while simultaneously delivering **effective disinfection and sterilization.**

Working Principle of Photocatalytic Exhaust Gas Treatment Equipment

As synthetically produced compounds become increasingly complex, highly concentrated, difficult-to-degrade organic wastes pose an ever-growing threat to the human environment. The photocatalytic exhaust gas treatment device employs a specialized technology that uses ultraviolet light sources to purify the molecular chains of exhaust gases.

First-level treatment: Utilizing light in the 253.7-nanometer wavelength band to cut, break, burn, and cleave the molecular chains of exhaust gases, thereby altering their molecular structure.

Second-stage treatment: Light in the 185-nanometer wavelength band is used to catalytically oxidize exhaust gas molecules, enabling the broken-down molecules or atoms to combine with O3. As a result, the molecular chains of organic or inorganic high-molecular-weight odorous compounds are transformed into low-molecular-weight compounds such as CO2 and H2O during the catalytic oxidation process.

Third-stage treatment: More than seven corresponding inert catalysts are configured based on the different components of the exhaust gas. These catalysts use honeycomb-shaped metal mesh as a support material, ensuring all-around contact with the light source. Below a 338-nanometer light source, the inert catalysts initiate catalytic reactions that amplify the light source’s effect by a factor of 10 to 30, enabling thorough reaction between the catalysts and the exhaust gas. This reduces the contact time between the exhaust gas and the light source, thereby enhancing the efficiency of exhaust gas purification. Moreover, these catalysts exhibit a mechanism similar to plant photosynthesis, effectively purifying the exhaust gas.

After triple treatment, the exhaust gas achieves a deodorization rate of over 99%, and its purification and deodorization effects significantly fall below the national emission standards for odorous pollutants promulgated in 2008.