Volatile organic compounds (VOCs) are harmful gases that can pollute the air and affect human health. The main components include: sulfur hydrocarbons, oxygen-containing hydrocarbons, nitrogen hydrocarbons, halogenated hydrocarbons, hydrocarbons and other polycyclic aromatic hydrocarbons. Due to their similar properties, they are easily mixed together and can pollute the environment. These VOCs can also threaten human health, enter the human body during breathing, and cause damage to human organs. Therefore, in the era of technology, it is necessary to treat volatile organic waste gas and control it at a certain concentration.

Disposal technology

Using catalytic combustion method to treat volatile organic waste gas

Catalytic combustion is a method of adding a catalyst to a reaction system, which allows VOCs to fully react under the action of the catalyst, producing CO2 and H2O, and then discharging them into the air. There are many types of catalysts currently used, mainly precious metal catalysts (such as Pt, Pd) and non precious metal catalysts (such as V, Ti, Fe, Cu, etc.). Compared with the thermal combustion method, the catalytic combustion method requires a lower combustion temperature (200 ℃~400 ℃). Due to their ability to burn at lower temperatures, the generation of secondary pollutants such as NO can be avoided, thus protecting the environment.

Biological treatment of volatile organic waste gas

The biological filtration method is used to treat VOCs, which are the main sources of organic waste gas in industrial production, municipal sewage, and sludge treatment. In order to control odorous gases, the technology of biological filtration has been proposed. In recent years, with the development of science, it has been found that this treatment method also has good effects on the treatment of VOCs. This biological filtration method can treat lower concentrations of VOCs.

Using adsorption method to treat volatile organic waste gas

Adsorption method is the use of adsorbents with microporous structures, which can adsorb adsorbates from the air onto the surface of the adsorbent. Through the adsorption of the adsorbent, organic matter can be separated from the main body, thus treating organic waste gas. The adsorption process flow is shown in the figure. When VOCs are transported to adsorption tower 1 through the action of a fan, the valve can be closed when adsorption saturation is reached in adsorption tower 1, and then the VOCs gas can be switched to adsorption tower 2 for adsorption. Since VOCs are desorbed separately in tower 1 and tower 2, they operate alternately, thus achieving continuous treatment and purifying VOCs.

Microwave catalytic oxidation technology for treating organic waste gas

Microwave catalytic oxidation technology is a high-tech treatment technology. With the development of science, this technology has achieved rapid development. It can effectively integrate traditional packing adsorption technology to improve the ability to treat VOCs. The implementation of this method has changed the traditional desorption treatment method to microwave desorption treatment method, greatly improving the treatment effect. In the process of treating VOCs, the use of microwave catalytic oxidation technology can not only shorten the desorption and adsorption time of exhaust gas, but also reduce the consumption and waste of various energy sources, reduce treatment costs, and improve the treatment capacity of VOCs.