131
1. Settling chamber
2. Cyclone separator
3. Filter
(a) High-efficiency particulate air (HEPA) filter
(b) Drum filter
(c) Bag filter
4. Electrostatic precipitator (ESP)
5. Wet scrubber
Conventional air pollution technique for controlling gaseous pollution from stationary sources includes:
1. Adsorption of pollutants
2. Catalytic system
3. Condensation, refrigeration of pollutants
4. Thermal oxidation or combustion of pollutants
5. Bio-filter
6. Sieve plate tower
7. Scrubber
Settling chamber in the context of air pollution is a chamber provided at the end
of pipe to reduce the velocity of air flow to achieve settling of particles in the
air stream.
Cyclone separator is used to separate particulate matter with the help of centrifugal force. Filters predominantly use physical strain to tap particles with size more
than pore size of filter media even though diffusion, interception, inertial impaction,
electrostatic forces also play role to some extent.
HEPA filters are made up of mat of randomly arranged fibres. Drum filters are
made up of perforated rotating drum with filter media.
Bag filters are made up of fabric bag usually woven. Several bags are placed in a
cabin (called bag house) depending on the volume of the gas to be cleaned.
ESP use electric charges to charge the particles which are then removed by plates
that are earthed. Wet scrubber uses liquid to trap the particle present in the polluted
air stream with co-benefit of removing gaseous pollutants as well.
Table 6.1 gives a summary of air pollution control equipment with respect to the
types of pollutants removed, examples of pollutants, control efficiency, device considerations and restrictions, common applications.
Mobile air pollution sources include vehicles in land, air and water
The key pollutants from automobile vehicle are as follows:
• CO 2
• CO
• Methane
• NO x
• Non-methane VOC
• PM
6.2 Engineering Control
1. Settling chamber
2. Cyclone separator
3. Filter
(a) High-efficiency particulate air (HEPA) filter
(b) Drum filter
(c) Bag filter
4. Electrostatic precipitator (ESP)
5. Wet scrubber
Conventional air pollution technique for controlling gaseous pollution from stationary sources includes:
1. Adsorption of pollutants
2. Catalytic system
3. Condensation, refrigeration of pollutants
4. Thermal oxidation or combustion of pollutants
5. Bio-filter
6. Sieve plate tower
7. Scrubber
Settling chamber in the context of air pollution is a chamber provided at the end
of pipe to reduce the velocity of air flow to achieve settling of particles in the
air stream.
Cyclone separator is used to separate particulate matter with the help of centrifugal force. Filters predominantly use physical strain to tap particles with size more
than pore size of filter media even though diffusion, interception, inertial impaction,
electrostatic forces also play role to some extent.
HEPA filters are made up of mat of randomly arranged fibres. Drum filters are
made up of perforated rotating drum with filter media.
Bag filters are made up of fabric bag usually woven. Several bags are placed in a
cabin (called bag house) depending on the volume of the gas to be cleaned.
ESP use electric charges to charge the particles which are then removed by plates
that are earthed. Wet scrubber uses liquid to trap the particle present in the polluted
air stream with co-benefit of removing gaseous pollutants as well.
Table 6.1 gives a summary of air pollution control equipment with respect to the
types of pollutants removed, examples of pollutants, control efficiency, device considerations and restrictions, common applications.
Mobile air pollution sources include vehicles in land, air and water
The key pollutants from automobile vehicle are as follows:
• CO 2
• CO
• Methane
• NO x
• Non-methane VOC
• PM
6.2 Engineering Control