METHODS OF CONTROLLING AIR POLLUTION

1. Control of air pollution by zoning.

2. Dilution of source discharge by

use of tall stacks (Chimneys)

3. Control by using source correction

methods (By changing raw materials,

process methods, equipment etc).

4. Reduction of pollutant discharge at

source by use of controlling equipment.

 CONTROL OF AIR POLLUTION BY ZONING

By proper zoning, the city should be

planned in such a way that residential

areas and heavy industries are not located

too close to each other. Providing a green

belt between the industries and the

township, will reduce the impact of air

pollution.

EQUIPMENT FOR CONTROL OF PARTICULATE POLLUTANTS FROM THE GAS STREAM

1. Gravity settling chambers

2. Cyclonic separators or cyclones

3. Fabric filters

4. Electrostatic precipitations

5. Scrubbers or wet collectors

Electro precipitations: They utilize

electrical energy for removal of the

particulate matter from gaseous stream.

Particles as small as 0.1μ size can be

removed by these devices. Generally used

to separate fly ash particles from flue gases

in thermal power plants.

Scrubbers or wet collectors: Scrubbers

are the devices which utilize a liquid to

assist in the removal of particulates from

the carrier gas stream. Generally water is

used as the scrubbing liquid. Particles less

than 0.2μ can also be removed.