Question

Electrostatic precipitator can remove over

• A. 99 percent $S{O}_2$ from exhaus
• B. 99.9 percent $S{O}_2$ from exhaust
• C. 99.9 percent particulate matter present in the exhaust
• D. 99 percent particulate matter present in the exhaust

Answer 1

The correct option is D 99 percent particulate matter present in the exhaust

Electrostatic precipitator: Introduction
Electrostatic precipitator is used to remove particulate matter from waste gases emitted out by power stations and industries.

Electrostatic precipitator: Working

• Electrostatic precipitators are composed of two electrodes maintained at several thousand volts.
• These electrodes produce a corona of negative charges.
• The released electrons get attached to the particulate matter passing through the precipitator.
• The suspended particles after being exposed to the corona get negatively charged and are attracted to the collecting plate grounded in the earth.
• These electrodes are removed and cleaned at regular intervals to collect the soot and ash.

Therefore, it is most widely used to remove over 99% of particulate matter present in the exhaust of a thermal power plant.

Final answer
(C) 99 percent particulate matter present in the exhaust