Question

'Fly Ash' is the waste generated by:
1. Hydropower plant
2. Thermal power plant
3. Geothermal plant
4. Windmills

Answer 1

Correct Answer - Option 2 : Thermal power plant

Concept:

• Fly Ash:
  • It is a byproduct of the burning of coal in electric power generating plants.
  • It is called fly ash because it is transported from the combustion chamber by exhaust gases.
  • It is collected from the exhaust gases by electrostatic precipitators or bag filters.
• Composition:
  • Fly ash includes substantial amounts of silicon dioxide (SiO2), aluminum oxide (Al2O3), ferric oxide (Fe2O3), and calcium oxide (CaO).
• Properties:
  • Resemble Portland cement but is chemically different.
  • Portland cement is a binding material in the form of a finely ground powder, that is manufactured by burning and grinding a mixture of limestone and clay.
  • Its chemical composition includes calcium silicates, calcium aluminate, and calcium alumino ferrite.
  • Exhibit cementitious properties.
  • Cementitious material is one that hardens when mixed with water.

Explanation:

Fly ash is a fine by-product recovered from gases of burning coal in thermal power plants.

• They are micron-sized earth elements primarily consisting of silica, alumina, and iron.
• Fly ash causes air pollution.
• It can also contaminate water and soil systems.