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DAILY NEWS ANALYSIS

  • 13 February, 2021

  • 5 Min Read

Fly Ash

  • Definition: It is a byproduct from 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), aluminium oxide (Al2O3), ferric oxide (Fe2O3) and calcium oxide (CaO).
  • Properties:
    • Exhibit cement like properties.
  • Uses: It is used in concrete and cement products, road base, metal recovery, and mineral filler among others.
  • Harmful Effects: Fly ash particles are toxic air pollutants. They can trigger heart disease, cancer, respiratory diseases and stroke.
    • When combined with water they cause leaching of heavy metals in ground water.
    • It also pollutes the soil, and affects the root development system of trees.

Source: TH


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