Biology
Grade-7
Easy

Question

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

  1. Sludge
  2. Sewage
  3. Sewers
  4. Sewers

hintHint:

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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