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Exhaust Air Purification: Removing Dust

In many industrial sectors, dusts are generated as a result of production. Whether dry, wet, sticky, combustible, small or large grain size – the exhaust air generated must be cleaned and freed of dust in accordance with legal requirements before it can be released into the environment. Special industrial dedusting systems are indispensable in order to comply with the regulations of the TA Luft, an administrative regulation of the Federal Immission Control Act.

Why Must Waste Air Be Dedusted?

Dedusting is the process of filtering or separating solid particles from a gas. This refers primarily to dusts that are produced during industrial production and are pollutants for the environment. With the help of dust collection systems, industrial dusts are prevented from entering the environment, settling there, and having a negative impact on flora and fauna.

But dust extraction is not only important for environmental reasons – it is also important in terms of safety. Depending on the production processes, combustible and explosive dusts can be produced. To avoid accidents here, the exhaust fumes must be routed through dedusting systems. And the issue of health also plays a role, because especially dust of smaller grain sizes can settle in the bronchial tubes over time and lead to chronic asthma and other diseases of the pulmonary system. Another reason for dust collection systems.

Where Does Industrial Dust Originate

The range of industries in which dusts are generated that have to be removed from exhaust gases and fumes with the help of dust extraction systems is wide. The areas of application also include:


Limestone and Cement Processing


Food Industry

Power Engineering


Furniture Industry

Automotive and Supplier Industry

Waste Disposal Industry

Chemical and Pharmaceutical Industry

Dedusting with Systems from Wessel-Umwelttechnik

In order not to exceed the legal thresholds for dust emissions, there are several dust extraction systems that function differently in detail. Which dedusting variant is chosen depends on the type of dust and the temperature of the dusts. Wet and dry dedusting systems from Wessel-Umwelttechnik are suitable for a large number of dust-producing industrial sectors. Here, dusts are physically or absorptively filtered or washed out of the exhaust air.

Wet Dedusting

Wet separators remove both coarse and fine particles. In Wessel's wet dust collectors, the DLP scrubber or the AGGLO scrubber, scrubbing liquid is added to the gas flow. This binds the dust particles and thus removes them from the exhaust gas. For this purpose, special internals are used or high relative velocities between exhaust air and scrubbing liquid are realised. Thanks to wet dedusting, there is no risk of fires or explosions caused by the dust to be filtered. Wet dedusters are used especially for high exhaust air temperatures and agglomerating dusts.

Dry Dedusting

Dry dust collectors such as fabric filters remove dust of various kinds from exhaust air from various industries. In this type of dedusting, the exhaust air stream is passed through a filter medium. This retains the dust and allows the cleaned exhaust air to pass through. This variant is a cost-effective type of exhaust air filtration and is also suitable for limited space conditions.


Minimising the Risks of Dust Extraction

Dust is not only risky in the environment, there are also already risk factors in the dedusting system that must be minimised in the process. Very fine dusts in particular can burn or even explode. These include a number of substances that are harmless in everyday life or just by itself – such as flour, starch, and aluminum dust. Inside dust extraction systems, especially in dry dust extraction systems, dusts are finely swirled. Discharge sparks can occur in the process. According to ATEX-95, an explosion protection directive, explosions, and fires must be prevented by certain safety precautions. The systems must be earthed, and special extinguishing systems must be integrated. There must also be the possibility of pressure relief in the event of an explosion. This can be via specially certified bursting discs.

At Wessel-Umwelttechnik, we assess each case individually and can therefore configure and install dust collection systems tailored exactly to your application.



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