Question

Particulate and gaseous pollutants along with harmless gases are released from the thermal power plants.

1. Name any two harmless gases released.

2. Name the most widely used device of removing particulate pollutants from the air. Explain how the device is used.

Answer 1

1. NO₂ & O₂ .

2. Electrostatic precipitator It has electrodes which are maintained at several 1000 watts which releases electrons. These electron attach to dust particle giving them a net -ve charge. The collecting plates attract the charged dust particle. The velocity of air between the plates are lowered to allow dust to fall.