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Consider the following statements regarding electrostatic precipitator. 1. An electrostatic precipitator can remove over 60 per cent particulate matter present in the exhaust from a thermal power plant.  2. It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons. Which of the statement given above is/are correct?

Consider the following statements regarding electrostatic precipitator. 1. An electrostatic precipitator can remove over 60 per cent particulate matter present in the exhaust from a thermal power plant.  2. It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons. Which of the statement given above is/are correct? Correct Answer 2 only

The correct answer is 2 only.

Important Points

  • There are several ways of removing particulate matter; the most widely used of which is the electrostatic precipitator, which can remove over 99 per cent particulate matter present in the exhaust from a thermal power plant. Hence, Statement 1 is incorrect.
    • It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons. Hence statement 2 is correct.
    • These electrons attach to dust particles giving them a net negative charge.
    • The collecting plates are grounded and attract the charged dust particles.
    • The velocity of air between the plates must be low enough to allow the dust to fall. 
  • A scrubber can remove gases like sulfur dioxide.
    • In a scrubber, the exhaust is passed through a spray of water or lime.
    • Recently we have realized the dangers of particulate matter that are very very small and are not removed by these precipitators.

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