The GATE Grind

GATE 2021 ES – Question 19

Water and Wastewater Treatment and Management · Water Treatment · 1 mark · Multiple choice

What drives Type-I settling in a sedimentation tank?

  1. Agglomeration
  2. Compression
  3. Gravity
  4. Charge neutralization

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Correct answer: (C) Gravity

Explanation

Type-I settling is discrete-particle settling under **gravity, C**,with particles retaining their size and identity. Agglomeration corresponds to flocculent settling;compression concerns dense sludge;charge neutralization destabilizes particles before settling rather than being the settling force.

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