Which among the following is removed using a scraper during wastewater treatment?

Grease

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Plastic

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Sludge

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Sand

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Solution

The correct option is C Sludge
Wastewater treatment includes the removal of organic and inorganic impurities from water.
The wastewater is allowed to settle in a large tank which is sloped towards the midde. When it is poured into the tank, solids like faeces settle down. This solid mixture is called sludge. It is removed using a scraper.

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Question 21

Three statements are provided here which define the terms, i.e. sludge, sewage and wastewater. Pick out the correct definition for each of these terms.
(a) The settled solids that are removed in wastewater treatment with a scraper.
(b) Water from kitchen used for washing dishes.
(c) Wastewater released from homes, industries, hospitals and other public buildings.

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