Air pollution control devices

 Air pollution control devices are categorized as:

    a) Control devices for particulate matter

    b) Control devices for gaseous contaminants

Control devices for particulate contaminants

Based on physical principles, they are divided into five major group. They are:

    1.    Gravitational settling

    2.    Cyclone separator

    3.    Fabric or bag filters

    4.    Electrostatic precipitator

      5.    Wet collector (scrubber)

Control devices for gaseous contaminants

The treatment process for the control of gaseous emissions include:

       1. Absorption
       2. Adsorption
       3. Condensation
       4. Combustion

Absorption
In this method, contaminant gas is brought in contact with a liquid absorbent.
Adsorption
In this method, steam of effluent gas is passed through a porous solid material.
Condensation
In this method, gas is converted into liquid by process of condensation.
Combustion
In this method, more toxic gas forms are converted into less toxic gas like CO2 and water by burning.