Photocatalytic Oxidation

Photo: Photocatalytic Oxidation

This process is a combination of photo-oxidation based on the effect of UV radiation and catalytic oxidation. It is mainly used in environments that are burdened with a high quantity of odorous and organic substances that are hard to decompose (oxidize). Contaminated air is directed into a tunnel where UV radiation causes a chemical reaction. Organic substances get decomposed, as particles of oxygen, ozone, and other oxidizing ions are generated. UV radiation supports this process by additionally breaking the molecules of decomposed substances. This process makes it possible to oxidize substances that are otherwise hard to decompose, or special substances such as hydrogen sulphides, ammonia, mercaptans, to get rid of foul odours. Relatively short retention times are sufficient for oxidation. The media consist of a special catalyst that must correspond to the content of pollutants in the air.

Photocatalytic oxidation is especially suitable for processing heavily polluted waste gases, e.g.:

  • Elimination of foul odours in wastewater treatment plants
  • Storage, treatment, and drying of sludge
  • Processing of residual water from tanks containing a mixture of water and oil
  • Reception of faecal waste
  • Recycling plants

The ionization process is mainly used to eliminate foul odours inside buildings, such as drying plants, rooms with sludge tanks, office premises, wastewater treatment plants, pumping stations, flotation equipment in dairies, etc. As ionization mainly depends on oxygen activation, the application of this technology is very flexible. If ionization units are installed in rooms, polluted air is treated directly. The ionization unit activates oxygen in the air, and the room polluted by odorous substances serves for the execution of the final reaction. Therefore, air extraction from the room can be limited to the minimum or even eliminated altogether (in some applications). This results in low operating costs, especially for heating (or cooling in a hot climate). Intermittent operation of the unit is possible. If the ionization unit cannot be installed in a room, ambient (fresh) air can also be ionized and mixed with the polluted air for the final reaction.

Ionization - IonActOx - IAO (implementation examples)

Building type Building type Pumping station Screening plant (mech. pre-treatment) Sludge thickening
Foul odour Low concentration Low concentration Low concentration Strong smell
Building volume 1 400 m3 2 700 m3 3 500 m3 1 500 m3
Air circulation 1 400 m3 2 700 m3 3 500 m3 1 500 m3
Air exchange frequency 1 x 1 x 1 x 1 x
Unit type PhoCatOx PhoCatOx PhoCatOx PhoCatOx
Number of units        
Unit dimensions 1600 x 1200 x 4000 mm 2300 x 2300 x 3400 mm 1600 x 1200 x 4000 mm 1100 x 1200 x 3200 mm
Unit weight 1 500 kg 3 000 kg 1 600 kg 1 000 kg
Material Stainless steel AISI 304 (1.4301) Stainless steel AISI 304 (1.4301) Stainless steel AISI 304 (1.4301) Stainless steel AISI 304 (1.4301)
Energy consumption 3,5 kW 6,0 kW 7,5 kW 4,3 kW
Odour filter Part of system Part of system Part of system Part of system
UV chamber Part of system Part of system Part of system Part of system
Catalyst Part of system Part of system Part of system Part of system
Fan Part of system Part of system Part of system Part of system
Material       Aluminium
Connection       230 / 400 V / 50 Hz
Control panel Part of system Part of system Part of system Part of system
Dimensions       600 x 600 x 230 mm
Material       Stainless steel AISI 304 (1.4301)
El. connection       400 V / 50 Hz / 16 A