GATE CE 2020 Set 2 — Question 27
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Environmental Engineering → Air Pollution → Particulate Matter Control
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Question
A gas contains two types of suspended particles having average sizes of and . Amongst the options given below, the most suitable pollution control strategy for removal of these particles is
Correct answer
(A) settling chamber followed by bag filter
Solution
Gravity settling chambers are effective for removing coarse particles (typically ). Bag filters (fabric filters) are highly efficient for removing fine particles (down to sub-micron levels, including ). In industrial air pollution control, coarse removal stages always precede fine removal stages to prevent overloading and damage to the high-efficiency equipment. Thus, a settling chamber followed by a bag filter is the most suitable strategy.
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