Treatment method for waste gas containing triphenyl

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Treatment methods for waste gas containing triphenyl. Currently, there are three main methods for treating organic waste gas containing "triphenyl": activated carbon adsorption, catalytic combustion and biological treatment. (1) Activated carbon adsorption method. Special activated carbon is used to adsorb organic gases such as benzene, toluene, and xylene in waste gas. When a certain amount of waste gas is adsorbed, the adsorption capacity begins to decrease. At this time, the activated carbon needs to be replaced or regenerated. This method is suitable for working conditions with low concentration and small gas volume. If the exhaust gas volume is large or the concentration is high, the activated carbon needs to be replaced frequently. The large amount of waste activated carbon generated can easily become secondary pollution, and the operating cost is high. In addition, activated carbon has poor adsorption effect on other linear alkanes. For low-concentration, large-volume exhaust gases, activated carbon adsorption and catalytic combustion methods are usually used together. Activated carbon is first used for adsorption and concentration, and then the analytical gas containing high concentrations of organic matter is catalytically burned during the regeneration process, which can avoid the generation of a large amount of activated carbon pollutants. (2) Catalytic combustion method. The catalytic combustion method treats organic waste gas containing "triphenyl", which oxidizes organic pollutants in the waste gas into carbon dioxide and water at a lower temperature under the action of precious metal catalysts such as lead and palladium. This is an organic waste gas treatment method under catalytic conditions without open flames, which can treat various organic waste gases. This method is very mature and widely used, and is suitable for treating high-concentration organic waste gases. However, if the temperature of the catalyst bed is not well controlled, there is a risk of explosion. (3) Biological law. Biological method refers to the use of microorganisms to absorb and decompose organic waste gas containing "triphenyl". This is an emerging technology that uses the growth and reproduction process of microbial strains to absorb the characteristics of organic waste gas as nutrients, and degrade the harmful components in the waste gas into carbon dioxide, water and cell components, thereby achieving the purpose of treating waste gas. This method has a wide applicable concentration range, low investment, simple operation and maintenance, and no secondary pollution. The longer the operation time, the more adaptable the microorganisms are to the exhaust gas, and the better and more stable the treatment effect will be. The key to this method is the selection and cultivation of efficient and suitable microbial strains. The core of the biological treatment process for organic waste gas containing "triphenyl" is biofilm. The basic principle is to use microbial breeding technology to form a variety of special microbial strains through cultivation, domestication, and enrichment, and then inoculate these microbial strains on the porous filler surface to form a biofilm layer. When waste gas containing a variety of volatile organic compounds flows through the packed tower, due to diffusion, the pollutants in the waste gas are transferred to the biofilm; under suitable environmental conditions, the biofilm grows and reproduces through biochemical reactions through microbial enzymes, using the organic components in the waste gas as nutrients and degrading them into carbon dioxide, water and cell components, thereby achieving the purpose of purifying waste gas.