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GATE 2023 ES – Question 40

Air and Noise Pollution · Particulate Pollutants · 2 marks · Multiple choice

A boiler emits fine particulate matter at a location with high plume rise. Which control is best if the collected particles will be reused?

  1. Reduce stack height/increase diameter
  2. Wet collectors
  3. Flue-gas desulfurization
  4. Electrostatic precipitator

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Correct answer: (D) Electrostatic precipitator

Explanation

An electrostatic precipitator efficiently captures fine particles and can recover them as a relatively dry solid, suitable for reuse. Wet collectors create a wet residual, and FGD primarily targets sulfur gases. Stack changes alter dispersion rather than collect the material. Thus **ESP, D**.

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