Control devices


The following items are commonly used as pollution control devices in industry and transportation. They can either destroy contaminants or remove them from an exhaust stream before it is emitted into the atmosphere.

Particulate control

  • Mechanical collectors (dust cyclones, multicyclones)
  • Electrostatic precipitators An electrostatic precipitator (ESP), or electrostatic air cleaner is a particulate collection device that removes particles from a flowing gas (such as air), using the force of an induced electrostatic charge. Electrostatic precipitators are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulates such as dust and smoke from the air stream.
  • Particulate scrubbers Wet scrubber is a form of pollution control technology. The term describes a variety of devices that use pollutants from a furnace flue gas or from other gas streams. In a wet scrubber, the polluted gas stream is brought into contact with the scrubbing liquid, by spraying it with the liquid, by forcing it through a pool of liquid, or by some other contact method, so as to remove the pollutants.
  • NOx control
    • Low NOx burners
    • Selective catalytic reduction (SCR)
    • Selective non-catalytic reduction (SNCR)
    • NOx scrubbers
    • Exhaust gas recirculation
    • Catalytic converter (also for VOC control)
  • VOC abatement
    • Adsorption systems, using activated carbon, such as Fluidized Bed Concentrator
    • Flares
    • Thermal oxidizers
    • Catalytic converters
    • Biofilters
    • Absorption (scrubbing)
    • Cryogenic condensers
    • Vapor recovery systems
  • Acid Gas/SO2 control
    • Wet scrubbers
    • Dry scrubbers
    • Flue-gas desulfurization