gas cleaner


Dr. Roland Stehle

managing director - technical departement

Email: stehle(at)

phone +49 7131 1589 31

1-Tower System with access ladder

Desulphurization plants are primarily used for removal of sulphur (H2S) from biogas. Sulphur in biogas causes environmental pollution and serious corrossion problems in pipe systems, heaters and gasmotors.


The process

The H2S impregnated gas is passed through a tower formed desulphurization reactor containing specially formed gascleaning mass (medium) in pellet form. This leads to a chemical reaction between the sulphur in gas and cleaning medium containing ironoxide; the interaction results in the chemical absorption of sulphur into the cleaning medium, ironoxide becomes ironsulphide. The controlled addition of compressed air into the crudegas causes a constant regeneration of the cleaning medium as elementary sulphur forms.



2-Tower System with Spiral staircase

Area of application


Desulphurization of:

  • gas purification in communal WWTPs.
  • agriculturual biogas from anaerobic industrial water treatment plants.
  • disposal site gases
  • biogases from fermentation of waste products.

Advantages in summary.

  • an operationally safe and effective system proven over decades.
  • high cleaning performance with low operational costs.
  • low pressure loss is achieved by optimum pellet form.
  • loading of the plant with gas cleaning mass during operation.
  • high loading rates and fine cleaning achieved by the very effective reaction of the cleaning medium.
  • problem free and cost effective disposal of used medium.
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