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Biology

Grade-7

Easy

Question

The settled solids that are removed in wastewater treatment with a scraper are called ____________.

Sludge
Sewage
Sewers
Sewers

hint Hint:

The mass is also referred to as slurry.

The correct answer is: Sludge

Sludge is the solids that settle at the bottom of a waste water treatment plant

It is also called as residue that appears semi-solid in nature

Sludge is classified into primary and secondary sludge

Primary sludge results from chemical treatment or due to sedimentation

Secondary sludge results from biological treatments

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