Fundamentals of prevention and control of air pollution

Different techniques for controlling these pollutants are discussed below:

Methods of controlling gaseous pollutants –

1. Combustion – This technique isused when the pollutants are in the form of organic gases or vapors. During flame combustionor catalytic process, these organicpollutants are converted into water vapor and relatively less harmful products, such as CO2.

2. Absorption – In this technique,the gaseous effluents are passed through scrubbers or absorbers. These contain a suitable liquid absorbent, which removes or modifies one or more of the pollutants present in the gaseous effluents.

3. Adsorption – The gaseous effluents are passed through porous solid adsorbents kept in suitable containers. The organic and inorganic constituents of the effluent gases are trapped at the interface of the solid adsorbent by physical adsorbent.