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Question

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

A
Grease
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B
Plastic
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C
Oil
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D
Sludge
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Solution

The correct option is D Sludge
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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