Wessel-Umwelttechnik GmbH - Deurotech Group products

Biological exhaust air cleaning is used whenever exhaust air has to be cleaned from volatile organic compounds (VOCs) and odours. Biofilters play a major role in this process. The polluted exhaust air is passed through a filter medium where the VOCs and odours are separated. Normally, this medium is an organic carrier material where microorganisms are grown on. They convert the VOCs and odours into non-critical components by means of their metabolism. Especially regarding the removal of odorous substances, biofilters are a very efficient and comparatively inexpensive way of biofiltration - with an efficiency of up to 99 %. BIOCAT-biofilters have a high degree of efficiency in a wide range of applications, even for exhaust air components that are difficult to dissolve in water.

According to kind of dust and characteristics there are different possibilities to reduce dust emissions in the exhaust air of industrial processes. 

The VOC-concentrator eliminates volatile organic compounds (VOC) from a low-concentrated exhaust air volume and sets the adsorbed solvents free in a high-concentrated small exhaust air volume for further treatment. The VOC-containing process exhaust air is guided via a pre-filter and flows through the absorption zone. There the VOC are removed and the cleaned air leaves the rotor.

If no procedures for biological or chemical exhaiust air cleaning are to be used efficiently, the thermal treatment is regarded as method of choice. The basic thermal processes are: Recuperative thermal oxidation. Regenerative thermal oxidation. Catalytic oxidation..