Question

Air pollution management for particulate matter is carried out by devices such as arresters. The device which is not an example of an arrester is.
A. Cyclonic separator
B. Scrubber separator
C. Gravity settling chamber
D. Teflon porous bags or filters

Answer 1

Particulate matter (PM) is a mixture of small solid particles and liquid droplets suspended in the atmospheric air, which are hazardous to the living organism. The particulate matter includes chemical components including acids, pollen, smoke, soil, metals, etc. These materials can be eliminated by using the particulate pollutant controlling devices.

Complete answer:
The particulate matter which is present in the air is microscopic. So, it can easily enter into the nasal cavity and affect the organs in the body and can cause serious health problems like lung disease, heart disease, etc. Hence, the particulate matter must be controlled by using a particulate control device.
The particulate matter can be removed only by means of a physical method, not by chemical method.
They are basically two particulate control devices which differ only in their principle.
They are:
Arrester – Most common devices used to separate particulate matter in the air.
Scrubbers – a device that used to separate the dust and dehydrate the wet gases.
They are two types of scrubbers:
Wet scrubbers
Dry scrubbers
Scrubber separator is not an example of arresters. It is used to clean the dust and wet gasses.
Hence, the correct answer is option (B) Scrubber separator.

Note:
The different kinds of arresters which arrest the matter in different ways:
-Gravity – the separation is done by applying gravitational force. Example – gravity settling chambers.
-Centrifugal force – separates the particle by using greater movement. Example – cyclonic separators and trajectory separators.
-Filters – it settles the particulate matter by allowing the gas through the filter materials. Example – Teflon porous bags.
-Electrostatic precipitators – precipitate the matter by supplying an electric field.