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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(c) Wastewater released from homes, industries, hospitals and other public buildings.

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