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Environmental Issues

Question

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Write a note on working of electrostatic precipitator.

Solution

An electrostatic precipitator has electrode wires and a stage of collecting plates and scrubber. The electrode wires are maintained at several thousand volts, which produce a corona that releases electrons. These electrons attach to dust particles and give them a net negative charge within a very small fraction of a second. The collecting plates are grounded and attract the charged dust particles. The velocity of air between the plates is low enough and allows the dust to fall. The scrubber removes gases like sulphur dioxide by passing the the exhaust through a spray of water or lime.

Some More Questions From Environmental Issues Chapter

Which of the atmospheric layer contains ozone layer ?

The amount of dissolved oxygen required by the microorganisms to degrade the organic wastes present in water is called ?

The cause of acid rain is :

Which one of the following causes ozone depletion ?

What disease is caused due to consumption of fishes captured from water contaminated with mercury ?

Which one of the following is not a green-house gas ?

Which gas contributes the maximum in global warming ?

Fill in the blanks with suitable words :
1. Increase in concentration of soluble salts in the soil is called.........

2. Aforestation can check the advancement of......... .

3. DDT is a serious pollutant as it is a.........pollutant and undergoes......... .

4 .........plant has become a troublesome weed in agricultural fields.

5 .........are major aerosol pollutant present in jet aircraft emission.

Write “True” or “False” :

Coin one word for the following statements :
Discarded computer parts like monitors, key boards, mouse etc.

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