Question

In the context of reducing air pollutions, give the advantages of changing the process; maintaining and modifying existing equipment.

Answer 1

Change or modify the process of production in order to lower the atmospheric pollutants, for example :

1. The coal is washed before crushing it to reduce the fly ash emissions.
2. The process of absorption can be used to remove gaseous air pollutants. In this process, gaseous air pollutants are removed by dissolution into a liquid solvent like water or caustic or acid solution. Absorption is used to remove sulphur dioxide, chlorine, ammonia, nitrogen oxides, and hydrocarbons.
3. The process of absorption can be used to remove pollutants from wastewater. In this process, the target pollutants are made to attach to the surface of activated carbon. This is done by producing carbon through the combustion of coal, coconut shells, wood, and other organic materials. This carbon is then reacted with steam or carbon dioxide to produce activated carbon. Adsorption helps to remove pollutants as well as bad tastes and odours from drinking water.