Question

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

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

Answer 1

The Correct Option is D

In an industrial setting, scrubbers are devices used to remove pollutants from exhaust gases before they are released into the environment. Among the options provided, we need to identify what a scrubber effectively removes from the exhaust of a chemical industrial plant.

Let's evaluate the given options:

1. Particulate matter of the size 5 micrometer or above:
   Scrubbers are primarily designed to remove gaseous pollutants, not particulate matter of specific sizes. While certain types of scrubbers can capture some particulate matter, they are generally not optimized for small particles like those under 5 micrometers.
2. Gases like ozone and methane:
   Typical scrubbers used in industrial plants are not designed to handle these specific gases effectively. Ozone and methane are more challenging to remove using standard scrubbing techniques.
3. Particulate matter of the size 2.5 micrometer or less:
   This is typically removed by filters and not specifically by scrubbers. Again, the main purpose of a scrubber is to deal with gaseous pollutants rather than fine particulate matter.
4. Gases like sulphur dioxide:
   This is indeed the correct answer. Scrubbers, especially those utilizing wet scrubbing methods, are highly effective in removing sulfur dioxide (SO₂) from industrial emissions. This is achieved by using a liquid spray to absorb and neutralize the gas.

Conclusion: The correct answer is that a scrubber in the exhaust of a chemical industrial plant effectively removes gases like sulfur dioxide.