How to treat xylene exhaust

Xylene composition of the exhaust gas is mainly from a variety of paint additives and a variety of adhesives, waterproof materials, xylene exhaust how to deal with it? General use of activated carbon adsorption method, catalytic combustion method and biological treatment method for exhaust gas treatment, the following with the Everest blue editor to understand.

Activated carbon adsorption method

Activated carbon adsorption tower device with special activated carbon to adsorb benzene, toluene, xylene and other organic gases in the waste gas, when the adsorption capacity begins to decline after adsorption of the waste gas, it is necessary to replace the activated carbon or activated carbon recycling treatment. This method is suitable for processing low concentration, gas volume is not large working conditions, if the exhaust gas volume or concentration is large, it is necessary to frequently replace the activated carbon, resulting in a large number of discarded activated carbon easily become secondary pollution, and the operating cost is very high, then you can use activated carbon adsorption + catalytic combustion desorption process for treatment.

In addition, activated carbon is less effective in the adsorption of other straight-chain alkanes. For low concentration, atmospheric volume of waste gas, usually the activated carbon adsorption tower and catalytic combustion method is combined and used at the same time. Activated carbon is first used for adsorption and concentration, and then the resolved gases containing high concentrations of organics are catalytically combusted in the recycling process, which avoids the generation of large amounts of activated carbon pollutants;

Catalytic Combustion

The catalytic combustion method for the treatment of organic waste gas containing "three benzene" is to oxidise the organic pollutants in the waste gas into carbon dioxide and water under the action of catalysts containing lead, palladium and other precious metals and at a lower temperature. This is a catalytic premise, no open flame organic waste gas treatment method, can deal with a variety of organic waste gas. This method is very mature and has been widely used in the treatment of high concentrations of organic waste gas, but if the catalyst bed temperature control is not good, there is a risk of explosion;

Biological method

Microorganisms are used to absorb and decompose organic waste gas containing "three benzenes". This is an emerging technology that uses the characteristics of microbial growth and reproduction to absorb organic waste gas as nutrients and degrade the harmful components in the waste gas into carbon dioxide, water and cellular constituents, thereby achieving the purpose of treating the waste gas.

This method is suitable for a wide range of concentrations, low investment, simple operation and maintenance, no secondary pollution, and the longer the operation time, the microorganisms are more adapted to the exhaust gas, the better the treatment effect, the more chaotic. The hub of this method is to select and cultivate the microbial strains used.