In this article we will discuss about the sources of gaseous pollutants. Also learn about the methods for control gaseous and odours contaminants.
Thousand tonnes of dust sand obnoxious, gases are discharged in the environment from natural sources, stationary sources and mobile sources. Some of the important gaseous pollutants are sulphur compounds SO2, SO3 H2S, mercaptans, nitrogen compounds – NO, NO2 NH3, oxygen compound O3, CO, CO2, halogen compound – HF, HCl; organic compounds aldehydes, substances.
Some of the common malodrans gases are hydrogen sulphide, carbon disulphide, mercaptans, and products of decomposition of protein, phenols and some hydrocarbons. Some of major polluting industries responsible for emission of gaseous pollutants and odour are pulp and paper, fertilizer, petroleum and petrochemicals, tannery, food, detergent, sugar and distillery, chemical and pharmaceuticals industries.
Typical gaseous pollutants and their sources are given in Table 10.1.
Methods for Control Gaseous and Odours Contaminants:
The gaseous pollutants and odours emission control methods can be physical or chemical. The choice of a given method is usually determined by the physical and chemical characteristics of the pollutants and by economic and environmental considerations.
Some of the important pollution control method for gaseous and odours emission control are given in Table 10.2. During recent years adsorption processes have received considerable interest for removal of gases and odour materials from the pollutants.
