Exhaust Air Purification

The best way to protect the environment is to prevent emissions.

Our innovative waste-air purification systems minimize pollutants while maximizing profitability.

Thermal oxidation

The TO is capable of processing exhaust air streams with a high solvent load. The exhaust air preheater, which is used to preheat the exhaust air before it enters the combustion chamber, is an integral part of the TO. The combustion chamber is equipped with the Eisenmann BLUEMAX burner. Its use makes it possible to operate the combustion chamber in compliance with the strict CO specifications. At the same time, it is guaranteed that the TOC and NOx emissions are significantly below their regulatory limit values.

Due to the modular design of the Eisenmann TO, a wide range of specifications for volume flows and VOC loads can be mapped. This offers decisive advantages when using silicon-containing coating substances. Structured pipes, which significantly improve heat recovery, are used for special tasks.

The additional fuel required for the operation of the TO depends on the pollutant content of the exhaust air and
the desired heat output.

The well proven design is regarded as very robust and highly available. There are more than 1,300 systems in
operation, proof of the long experience and continuous development of this system.

Regenerative thermal oxidation

Since it uses very little additional energy, regenerative thermal oxidation (RTO) is a highly efficient exhaust air clearing system. In the Eisenmann solution, the complex valve system is replaced by a special air diffuser system with rotating distributor with a high rate of availability and low maintenance.


Eisenmann’s regenerative thermal oxidizers feature uncomplicated, robust technology with low operating costs. The space-saving single reactor system treats exhaust air flows from 10,000 to 120,000 Nm³/h, depending on size. For larger air quantities, multiple reactors are deployed in parallel.


Waste-air purification through adsorption
Unlike thermal oxidation processes, adsorption does not require chemically transforming pollutants or raising the temperature. In contrast to thermal oxidation processes, adsorption does not involve chemical transformation of pollutants or a significant increase in temperature. Adsorption makes use of the propensity of certain compounds (e.g. activated carbon or zeolite) to attract and adhere gas or vapor to their surface. The adsorbed pollutants then need to be removed. To this end, adsorption is always followed by desorption. The resulting desorption flow is up to 20 times more concentrated and accordingly has a much smaller volume. This means it can be treated much more cost-effectively.

Adsorption wheel

Adsorption is used to concentrate exhaust air with low concentrations. The smaller and more concentrated the exhaust air volume to be disposed of, the lower the investment and operating costs. This is why large volumes of exhaust air with low concentrations of pollutants require concentration as a preliminary step, so that the final combustion or solvent recovery can take place efficiently.

Combustion chamber

When it comes to purifying exhaust air heavily laden with halogen and explosive solvent mixtures, the way to go is a combustion chamber. Eisenmann has various configurations of combustion chambers available. Depending on the application, the Turaktor can be used as an vertical or horizontal combustion chamber for waste-gas purification. The Eisenmann combustion chamber is integrated into the production process by means of a suitable heat recovery system and reliably maintains the required exhaust air thresholds as it purifies fumes.