Exhaust Air Treatment

When the exhaust gas treatment, the task-and vapor connections to eliminate or reduce.
The organic materials from the different production processes include a wide range of volatile components.
This problem occurs on at:

  • Process vents
  • Industrial exhaust
  • Deposit exhaust
  • Production of gases
  • Odors
  • The previously used methods:
  • Thermal oxidation
  • Catalytic processes
  • Absorption
  • Adsorption


are now complemented by the vacuum-ultraviolet Photooxidaton / photolysis systems.

The European VOC Directive is the 31 BimSchV transposed into national law.
With the Plants of the type ABOX ® GP, the requirements are fulfilled and meet the limits.
Oxidation caused by the non-toxic and odor-free products.
Other disposal problems do not occur.
UV systems with oxidative emissions to reduce or eliminate organic pollutants and odors.

Application examples:

  • Degradation of eg methane, hydrogen sulfide, etc.
  • in biogas, waste transfer and sorting facilities
  • Decomposition of organic substances in the exhaust air from
  • Stripping
  • Treatment of solvents (VOCs) in exhaust systems under consideration and compliance with the Lösemittel-verordnung/31.BimSchV
  • Odor Elimination
  • Exhaust air treatment to cytostatic jobs
  • Exhaust air treatment for clean rooms
  • etc.


12-fold radiator system ABOX ® GP


ABOX SYSTEMS GP for photo-oxidation / photolysis in the gas phase and exhaust air treatment

Increasingly, the task is:

Cleavage of chemical compounds in the gas phase, eg in an air stripping, in the exhaust air from suction or in the elimination of odor problems. For these applications, the process of photochemical cleavage - used - in addition to the application in the water. The fundamental reactions in this case are as follows:

Lfd.-Nr. Reaction
1 RR + hv ⇒ R ° R ° + division of the pollutant
2 O2 + hv ⇒ 2 O ° oxygen cleavage (lambda <190 nm)
3 O2 + O ° ⇒ O3 ozone formation
4 O3 + hv ⇒ O2 + O ° ozone cleavage
° 5 H2O + hv OH + H ° ⇒ split water from humid air (lambda <190 nm)

The photolysis of organic compounds requires an emission spectrum with a high radiation flux at wavelengths below 250 nm

Depending on the task, these application-related requirements of the ABOX GP - photo-oxidation systems are filled with various lamp modules.
Primary reaction is always the photolysis according to equation 1 The gap thus formed react with the same products formed according to Equations 2-5 oxidants. To avoid unwanted side effects or reaction products in the exhaust air, the gas stream after UV treatment led to a gas scrubbing.

A photoreactor consists of:

  • Inlet section with distribution
  • Irradiation chamber
  • UV lamp modules in transverse arrangement
  • Downstream
  • Power


To achieve optimum utilization of the UV radiation power must have a high penetration depth of UV light. This takes place particularly in the photoreactor with transverse flow. Only with this concept, particularly large penetration depths can be achieved.
For the technical application of UV oxidation in the gas phase, the following requirements on the spectral UV radiation sources:

  • the photolysis of O3 to O2 calls a UV spectrum with a high proportion of emission at 185 nm
  • the photolysis of O3 calls for a spectrum that the absorption spectrum between 220 nm and 290 nm, covering a very high proportion to the absorption maximum at 260 nm
  • the photolysis of organic compounds requires an emission spectrum with a high radiation flux at wavelengths below 250 nm
  • the photolysis of water to OH radicals requires UV lamps with emissions below 190 nm


There are 3 different types of lamps to choose from, which are used for each application:

  • Low-pressure mercury lamps made of synthetic quartz
  • Amalgam low pressure lamps made of synthetic quartz
  • Medium pressure mercury lamps with and without doping of synthetic quartz as a continuum sources with different radiation density


These lamps are arranged in the flow rates in different lengths to form modules. This makes it possible to vote both on pollutant concentrations and compositions of the systems.