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WELCOME

WELCOME. A PRESENTATION ON. Techniques to control Gaseous & Particulate Pollution. Prepared By Shristi Soni. Our Focus:-. Introduction Methods to control gaseous pollutant Control devices to control gaseous pollution Control devices for Particulate Pollution Conclusion.

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WELCOME

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  1. WELCOME

  2. A PRESENTATION ON Techniques to control Gaseous & Particulate Pollution Prepared By ShristiSoni

  3. Our Focus:- • Introduction • Methods to control gaseous pollutant • Control devices to control gaseous pollution • Control devices for Particulate Pollution • Conclusion

  4. Introduction A substance in the air which causes harm to humans and environment is known as pollutant. Pollutants such as sulphur dioxide, hydrogen sulphide, and nitrogen dioxide combine with moisture in the air to form acids that attack and damage library material are known as gaseous pollutants. Smoking, cooking, and off-gassing from unstable materials (cellulose nitrate film, paint finishes, fire-retardant coatings, and adhesives) may also produce harmful gaseous pollutants. Particulate pollutants, such as soot, dirt, and dust abrade, soil, and disfigure materials. Dust and dirt that have absorbed gaseous pollutants from the air become sites for harmful chemical reactions when they settle on library material. The pollution caused by this is known is particulate pollution.

  5. Gaseous Substance Gases and vapours can be categorized under gaseous pollutants. AIRBORNE CONTAMINANTS

  6. Method to control gaseous pollutants • adsorption • absorption • Reduction system • condensation

  7. Adsorption • Adsorption involves the interaction between gaseous contaminants and its surface of a solid adsorbent. • In this phenomenon molecules from a gas or liquid will be attached in a physical way to a surface. The binding to the surface is usually weak and reversible. The most common industrial adsorbents are activated carbon, silica gel, and alumina, because they have enormous surface areas per unit weight. • Activated carbon is the universal standard for purification and removal of trace organic contaminants from liquid and vapourCarbon adsorption uses activated carbon to control and/or recover gaseous pollutant emissions. In carbon adsorption, the gas is attracted and adheres to the porous surface of the activated carbon.

  8. adsorption

  9. ABSORPTION • Gaseous contaminants that are soluble in aqueous liquids can be removed in absorbers. This is one of the main mechanisms used for the removal of acid gas compounds (e.g., sulphur dioxide, hydrogen chloride, and hydrogen fluoride) and water soluble organic compounds (e.g., alcohols, aldehydes, organic acids).The contaminant gas or vapour is absorbed from the gas stream as it comes into contact with the liquid. • Biological treatment systems are termed either biological oxidation or biofilter systems. Regardless of the term, the fundamental processes involved is the collection of contaminants on the surface of a media • that contains viable microorganisms. The contaminant is metabolized by the organism and carbon oxide and water vapour is re-emitted. • All absorption processes operate best when the gas and liquid temperatures are low. Gas and vapour phase contaminants are most soluble under cold conditions.

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