Dorset Group B.V.

Biological Air Washers


The principle of biological air cleaning is, that bacteria process the unwanted particles out of the air. There are no chemicals involved. Thanks to the construction and design these bacteria perform all the work and do this thoroughly. Your farm has a long lifespan. Therefore, Dorset offers you the air washer which provides you the largest benefits for the long term: lowest running costs and high user convenience.

Placement below the roof or behind the barn?

The washer can be installed inside the barn. This can be done custom-made or as a plastic container in the ridge of the barn, above the central corridor. The washing water can be stored in a silo or water tank at base level.

The washer can also be delivered with washing water storage at the top floor. In that case the barn construction requires additional attention, due to the weight of the washer.

The biological air scrubber operates entirely on bacteria

The bacteria live in the filter layer. Once the air goes through the filter, the bacteria feed themselves with unwanted particles in the air. By spraying water over the filter layer, the bacteria are moistened and dirt is washed away. The washing water is sprayed several times until the water it is fully saturated.

A water curtain is deployed to remove dust. The air is drawn through a curtain of sprayed water, resulting in dust remaining in the water while the air continues.

How does the biological air scrubber differ from the chemical air scrubber?

The principle of chemical air washing is that if ammonia comes in contact with sulfuric acid, this results in a chemical reaction by which ammonia merges with the sulfuric acid and neutral ammonium sulphate formed.

This differs from the biological air scrubber, which operates completely on bacteria. The bacteria feed on unwanted portions in the air, such as the ammonica.

The biological washer achieves a higher odor reduction than the chemical one. The advantage of a chemical is, that it can be built more compact and is more suitable when a very high ammonia reduction should be achieved (95%). It is also better suited for air with high temperatures.

Dorset also has chemical washers available. These techniques are frequently used to wash air after drying of the digestate or manure. For washing stable air the biological air scrubber is most suitable because it has a lower air resistance.

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