In recent years, environmental protection has garnered increasing attention across various industries, particularly in the field of air pollution control. Common methods for industrial waste gas treatment include biological decomposition, activated carbon adsorption, plasma technology, plant spray deodorization, and UV photodecomposition purification. 1. Microbial Decomposition: This method utilizes a recirculating water system to dissolve pollutants from malodorous waste gases into water. Microorganisms are then cultivated in a water-based biofilm reactor to degrade the pollutants into less harmful substances, achieving an odor removal efficiency of up to 70%. However, due to the specificity of the microorganisms, they can only treat one or a few similar gases. To enhance efficiency and stability, control pH and temperature, the operation costs are relatively high, and more labor is required. Additionally, if the microorganisms die, it takes a considerable amount of time to regenerate them. 2. Activated Carbon Adsorption: This method takes advantage of the developed internal pore structure and large surface area of activated carbon to adsorb malodorous gas molecules passing through an activated carbon pool. Initial treatment efficiency can reach 65%, but it tends to become saturated quickly, usually within a few days, necessitating frequent replacement. Finding a disposal method for used activated carbon is also a challenge, and the operation and maintenance costs are high. It is suitable for low-concentration, high-volume gases, showing significant effects on alcohols and fats, but it is less effective on gases with high humidity and can lead to secondary environmental pollution. 3. Plasma Technology: This method employs high-voltage electrodes to emit ions and electrons, which destroy the structure of malodorous molecules by striking them. This results in the breakdown of malodorous molecules, demonstrating significant purification effects on low-concentration malodorous gases, with an efficiency of over 80% under normal operating conditions. It can handle a mixture of various odorous gases without being affected by humidity and without causing secondary pollution. However, it consumes a large amount of electricity, requires dust removal, and has high operation and maintenance costs. It is prone to causing explosions with high-concentration, flammable, and explosive gases. 4. Plant Spray Deodorization: This method neutralizes and absorbs malodorous gases by spraying plant extracts into the space where malodorous gases are produced. The deodorization efficiency can reach 50% at low concentrations. Different sprays are used for different odors, and it requires frequent addition of plant extracts, as well as equipment maintenance. The operation and maintenance costs are high, and it is prone to causing secondary pollution. 5. UV Photodecomposition Purification: This method uses high-energy UV ultraviolet light to break down and oxidize the molecular chains of malodorous substances within the photodecomposition purification equipment, altering the material structure. It degrades and oxidizes high-molecular-weight pollutants into low-molecular-weight, harmless substances, achieving a deodorization efficiency of up to 99%. This exceeds the national odor substance emission standards (GB14554-93) issued in 1993. It can handle high-concentration mixtures of ammonia, hydrogen sulfide, methyl mercaptan, dimethyl sulfide, benzene, styrene, carbon disulfide, and dimethyl disulfide. The internal light source can last for three years, and the equipment has a lifespan of over ten years. The purification technology is reliable and very stable, with no need for daily maintenance. It can be used normally by simply connecting the power supply, and it has low operation costs with no secondary pollution.