A scrubber in the exhaust of a chemical industrial plant removes:

Options

A. Gases like sulphur dioxide
B. Particulate matter of the size 5 micrometer or above
C. Gases like ozone and methane
D. Particulate matter of the size 2.5 micrometer or less

Answer

A

Explanation

Scrubbber is an electrostatic precipitator in which the dirty air is cleaned by capturing the gas like `SO_(2)` and other oxides in water/lime spray `(CaCO_(3))`. The calcium in lime stone combines chemically with the sulphur to produce calcium sulphate `(CaSO_(4))`, which is separately collected. The detailed mechanism is shown in the figre below.