Gas treatment – biogas, sewage gas and landfill gas

Gas treatment

Treating biogas, sewage gas and landfill gas

APROVIS is an expert in gas treatment technology. This includes the following areas:

  • FriCon (gas cooling, gas dehumidification)
  • Gas heating
  • ActiCo (sulphur and pollutant removal)
  • Compressors and gas blowers
  • Gas heat exchangers (biogas to natural gas)
  • Flexible use for combined heat and power plants and biogas plants


Feeding biomethane into the natural gas grid is playing an increasingly important role. APROVIS takes over biogas purification. In so doing, it ensures that biomethane treatment plants are operated safely. Reliable gas purification is required to enable the production of biomethane from biogas by eliminating carbon dioxide (CO2). Only this process promises a continuous flow and a small number of downtimes.

How upgrading biogas to biomethane works

Biogas is produced in the fermenter: Sewage gas in the sewage treatment plant, landfill gas in the landfill. Biogas has to be desulphurised, since the hydrogen sulphide produced would lead to corrosion.

Coarse desulphurisation takes place

  • Biologically with sulphur-oxidising micro-organisms
  • Chemically with precipitants such as iron oxide, which bind the sulphur

During this process, APROVIS takes over fundamental tasks:

  • Gas drying by cooling (optional: by compression)
  • Fine desulphurisation by adsorption on activated carbon
  • Adsorption by binding water to silica gels

Gas treatment also includes CO2 separation by pressureless amine scrubbing, pressurised water scrubbing, pressure swing adsorption or membrane technology. APROVIS provides (high-pressure) gas heat exchangers for this process.


The biogas is produced in the fermenter; coarse desulphurisation takes place biologically or chemically (as described above).

APROVIS covers the following services here:

  • Gas drying by cooling (optional: by compression)
  • Fine desulphurisation or siloxane removal by adsorption on activated carbon (optional: on zinc oxide)

The process of gas purification includes desulphurisation and the removal of hydrogen sulphide (H2S), siloxanes and other pollutants. This protects the engine and all the components that are in contact with the exhaust gas (especially the exhaust gas heat exchanger). Without desulphurisation, the sulphuric acid from the exhaust gas would cause corrosion damage, which could lead to total plant failure within a few days.


Biogas installations with combined heat and power plants are usually designed for continuous electricity feed-in. If combined heat and power plants can be flexibly controlled, potential fluctuations can be balanced out by using wind and solar energy. Biogas installations store the raw biogas. It is processed when electricity is needed.

The system must be kept at a certain temperature so no condensate is produced. This is particularly important in the case of ActiCo, the gas purification system using activated carbon filters. Condensate would destroy the activated carbon.

This is how APROVIS solves this task:

  • The ActiCo container is surrounded by heating coils with hot water
  • Heating takes place using hot water from the CHP unit, or electrical heating is performed means of a heating tape

What are your requirements?

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