Biowasher &
Biotrickling Filter
Biowasher &
Biotrickling Filter
Biowasher &
Biotrickling Filter

Use of microorganisms for exhaust air treatment


Bioscrubbers are used for the biological purification of exhaust air and exhaust gases. For this purpose, a physical gas scrubber is combined with a biological activation unit.

First, the raw gas is brought into contact with a cleaning solution in the absorber. In a second step the pollutants transferred to the scrubbing solution are decomposed by microorganisms to carbon dioxide and water in a regeneration reactor. The regeneration reactor corresponds to the activation tank in the wastewater treatment plant. Nutrients required for bacterial growth as well as acids and alkaline solutions for adjusting the optimal pH-value are dosed in. The upstream gas scrubber prevents aggressive pollutants in the exhaust gas from damaging the microorganisms used for cleaning.

Two-stage process for odor elimination and exhaust air purification

ABIONIK bioscrubbers can be used at air pollutant concentrations of over 100 mg/m3 – depending on the water solubility of the pollutants.

We have experience with washing the following groups of substances

  • phenols
  • sulphur compounds
  • carboxylic acids and carboxylic acid esters
  • aldehydes
  • alcohols


ABIONIK Bioscrubbers are always part of a customized solution

Absorbers can basically be designed as single or multi-stage units. The decisive factor for the design is a phase interface that is as large as possible to ensure the longest possible residence time of the air pollutants with the carrier material of the biology. In the case of easily degradable substances, a regeneration reactor can be dispensed with, provided that the absorber sump is sufficiently dimensioned. Sedimentation tanks are provided with active aeration if required. The individual scrubber components must be able to withstand the chemical stress. ABIONIK uses high-quality plastics, such as PP or HDPE, but also tanks and piping made of stainless steel.

Biotrickling Filters

Biotrickling filters from Abionik for odor elimination and exhaust air purification

In ABIONIK biotrickling filters microorganisms are used for exhaust air treatment to remove emission components from exhaust air streams that are contaminated with odors and pollutants.

Inert carrier materials for microorganisms

In conventional biofilter processes, biotrickling filters use inert carrier materials instead of the biological carrier materials on which the microorganisms are colonized. They are able to biochemically oxidize organic and inorganic gaseous compounds under aerobic conditions and convert them into low-molecular, non-harmful or odorless compounds such as carbon dioxide and water.

Moisture and the necessary nutrients are supplied to the bio-trickling filter via a sprinkler system. In contrast to conventional biofilter processes, the carrier materials are inert, i.e. they are not decomposed in the process. ABIONIK biotrickling filters are suitable for the purification of both solvent-loaded and odorous exhaust air with concentrations of up to 1,000 mg/m³.

Customized solutions due to a variety of possible process combinations

Especially the toxic pollutant gas hydrogen sulphide, which is often produced, can be successfully reduced below the emission limits specified in the Technical Instructions on Air Quality Control (TA-Luft) by using an ABIONIK bio trickling bed reactor. ABIONIK bio trickle bed reactors can also be used as a process combination with other exhaust air treatment systems such as activated carbon filters, chemical scrubbers or with downstream bio filter systems.

Possible fields of application are

  • sewage plants
  • composting plants
  • food and feed industry
  • paint shops
  • textile industry

Through cooperation with universities, technical colleges and research centers, ABIONIK has access to the latest scientific findings. When designing our biotrickling filters, the special requirements of the VDI guideline are taken into account (here: VDI 3478 part 2: 2008-04 Biological waste gas purification; bioriesel bed reactors).

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