Process of UV photo-oxidation
The principle of Direct Photo-oxidation (DF)
The broad spectrum of action of photo-oxidation in the removal of pollutants from gaseous or fluid media is based on the innovative and patented processes developed by us:
Procedural scheme
Cleaning of the volume flow
In the field of exhaust air purification, the main stream loaded with VOC (volatile organic compounds) is first conducted via a coarse- or fine-filtration stage and, if necessary, via a droplet separator stage, depending on the air quality.
UV photo-oxidation
The air stream then flows through the UV reactor, which is equipped with low-pressure or medium-pressure UV lamps, depending on the application. Here, the pollutants are oxidized and, ideally, completely separated into carbon dioxide (CO2) and water (H2O).
Catalyst
For optimization, a catalyst stage can be connected downstream in the absence of catalyst poisons. In many cases, however, at least one stage is provided for the destruction of excess ozone.
Direct photo-oxidation is also used successfully in the field of wastewater treatment.
The principle of Regenerative Photo-Oxidation (RF)
Procedural scheme
Purification by adsorption
The VOC-loaded exhaust air flow is alternately conducted via two parallel adsorption stages. In this case, the fluctuating VOC loads with high or low pollutant concentrations are completely separated from the necessary emission limit values by adsorption using a suitable adsorbent. The outgoing exhaust air permanently meets the required clean air limit values.
Regeneration cycle
Even before the adsorbent is exhausted, a switch is made to the second, parallel, fresh adsorption stage. The first stage passes into a UV operating phase in the regeneration circuit. In this case, the circulating air is passed through a UV stage and then through a catalyst stage before it returns to the adsorption stage.
Energy efficiency through synergy
As a result of the energy input from the UV radiation, the circulating air heats up to operating temperatures, which are necessary for the desorption and regeneration of the adsorbent as well as for the operation of the catalyst stage.
UV photooxidation
The previously adsorbed organic pollutants are expelled quickly and uniformly from the adsorption stage under controlled conditions and fed into the UV photooxidation stage with subsequent catalysis via the circulating exhaust air stream.Here, the photooxidative degradation of the pollutants up to CO2 and H2O takes place.
Scalability
The system can be expanded and retrofitted modularly in the event of production-related growing volume flows or increasing pollutant concentrations.
The concept of regenerative photo-oxidation [n.s.] is equally applicable to wastewater treatment.