STC wet scrubbers are available in many configurations: horizontal, vertical tower, single, double or triple stages, venturi scrubber, fixed bed, floating bed. The working principle is based on the absorption of the pollutants in water where the air emission is counter-washed by a water recirculating system through spraying nozzles. The scrubbers are partially filled with packing media (static bed or floating bed are available) made of proper material (Rashing rings, saddle, balls, Pall rings, Tellerette, or similar) to facilitate the absorption reaction by increasing the contact surface between the washing water and the contaminated gas. Depending on the application, different sorbents can be added (also in combination using two- or three-stages scrubber) to the circulating water to facilitate the absorption of the unwanted substances: Lime, Caustic Soda, Sulphuric Acid, Hydrogen Peroxide, Ozone and other chemicals are used to specifically target certain compounds.
A final demister will remove the mist and any drop of water from the emission.
Flow rate range from 3000 Nm3/h up to 100.000 Nm3/h.
Construction materials depends on the eission characteristics and temperature and normally include PP, HDPE, PVC, FRP, stainless steel AISI 304 or 316.
The scrubber have their own local control panel with PLC and communication port for remote control of all process parameters.