Exhaust Air Scrubber with Subsequent Photocatalysis

Exhaust Air Scrubber with Subsequent Photocatalysis

Purifying exhaust using fully automated exhaust scrubbers and subsequent photocatalysis

A description of exhaust purification in 4 stages:

  1. Soluble components are removed.
  2. Longer-chain carbons are broken down via UV-C light and the creation of ozone and other radicals.
  3. The ozone reacts with the split compound, i.e., carbon compounds are oxidized.
  4. Remaining odors are purified and residual ozone is eliminated.


  • Purifying exhaust from smokehouses using automated exhaust air scrubbers and subsequent photocatalysis
  • The purification system is suitable for exhaust that is strongly polluted by tar
  • The method effectively destroys organic and odor-carrying particles in the exhaust
  • The scrubber effectively separates particles containing tar – no other components are affected by the tar
  • An automated CIP system (CIP machines, cleaning-in-place) for the exhaust air scrubber and UV-C ozone system
  • Proven effectiveness or compliance with TA Luft (the German Technical Regulations on Emissions)


  • Hot and cold smoke from smokehouses (tar, total C)
  • Slaughterhouses/agriculture (ammonia, odors)
  • Industrial waste elimination/biomass (ammonia, odors)
  • Fertilizer manufacturing (ammonia, odors)


  • The system’s operation is 100% safe
  • Compliance with government regulations (the German Technical Regulations on Emissions, Total C, odor limitations)
  • Lowers operating and maintenance costs, less energy consumption when compared to afterburning (2000 m3/h corresponds to ca. 13 kW of energy consumption including all fans/ventilators)
  • No CO2 created during the combustion process
  • No annual testing costs necessary – as they are for the method of afterburning
  • An on/off system; not affected by fluctuating loads
  • The system saves on space; roof installation is possible, because it is lightweight and frost-resistant
  • Targeted removal of organic residues or tar
  • No chemicals used

Strong odor emissions with high tar levels occur during the process of smoking food. Generally, different smokers operate at different times. The individual smokers’ ventilation valves open at different times in conjunction with the relevant smoking program. At the same time, the smoking process requires that there be a low level of suction.

Minimal suction is maintained via a ventilator built into the scrubber. Exhaust from this process is initially treated by the scrubber. The resulting organic particles in the exhaust flow are separated out. Depending on the process, it is also possible to use the scrubbing water for a longer period of time. At the end of the defined period of time, the cleaning system starts. The scrubber empties and cleans itself without needing any other manual labor. Visuals of the scrubber’s state are shown via internet connection at the process control station.

After the scrubber has been cleaned, the tar-free exhaust air undergoes an air purification process. During this, the exhaust flows over special (ozone-producing) lamps that emit UV-C light. Their radiation splits organic molecule chains and transforms naturally occurring oxygen (02) into reactive oxygen (03), which combines with the odor carriers in the exhaust: organic and odor-causing substances are oxidized. Photocatalytic degradation processes on the surface of the integrated catalytic converter effectively destroy remaining odorous substances. All the residue is biologically degradable and is expelled together with the exhaust air.

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