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CONTROL DEVICES OF AIR POLLUTION

CONTROL DEVICES OF AIR POLLUTION

Prevention is always better than cure. So we should try to prevent the air pollution by changing the raw material, the process conditions, procedure and by having the preventive maintenance one can prevent the air pollution.  

In addition to the preventive measures we need to have control technologies to minimize pollution. Depending upon the situation different control technologies are adopted. 

Control of pollutant from stationary sources

- Particulate matter

The control of particulate matter is an important aspect of industrial air pollution engineering. Particles are collected by a combination of several mechanisms. The six available mechanisms are gravitational settling, centrifugal impaction, inertial impaction, direct interception, diffusion and the electrostatic attraction.   

There are five basic types of dust collectors used for particulate pollutant control 

- Gravitational Settling chambers 

- Cyclone separators 

- Fabric filters 

- Electrostatic precipitators 

- Wet collector (scrubbers) 

The first two of the above are used for coarse particulates where as the other three are used for fine particulates 

Gravitational Settling Chambers. This is a simple particulate collection device using the principle of gravity to settle the particulate matter in a gas stream passing through its long chamber. The primary requirement of such a device would be a chamber in which the carrier gas velocity is reduced so as to allow the particulate matter to settle out of the moving gas stream under the action of gravity. This particulate matter is then collected at the bottom of the chamber.  The chamber is cleaned manually to dispose the waste.