Biofilter / Odor Control / Waste Air Treatment

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Biochemical Functions

  The most important reaction of the degradation process is the oxidation of carbon, sulphur, and nitrogen compounds to CO2, SO42- and NO3-, and their assimilation into biomass. At times of reduced input concentrations, microorganisms also assimilate nitrates (NO3) and sulphates (SO42-) into biomass.

chemical reaction (simplified)

  - Organic Carbon Compounds

R-CH3 ------> CO2 + H2O + Biomasse

- Organic Sulphur containing Compounds

R-SH ------> SO42- + Biomasse
R-SH ------> SO42- ------> Biomasse

- Organic Nitrogen containing Compounds

R-NH2 ------> NO3- + Biomasse
R-NH2 ------> NO3- ------> Biomasse

R = organic rest

The concentration of odourous compounds in the air is low at many times (<100 mg/m3). This amount together with the buffer of the filter matrix is still enough to keep the bacteria alive during days without waste air. Biofilters which are loaded with higher concentrations of organic substances may have a shorter lifetime because the additional biomass might consume more of the filater matrix. The lifetime of filter material is mainly between 2 and 8 years.