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GATE 2026 ES – Question 29

Water and Wastewater Treatment and Management · Sewage Collection and Treatment · 1 mark · Multiple select

Which processes primarily remove organic matter in sludge? Select all that apply.

  1. Digestion
  2. Incineration
  3. Magnetic separation
  4. Wet-oxidation

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Correct answer: (A) Digestion; (B) Incineration; (D) Wet-oxidation

Explanation

Digestion biologically converts degradable organics to stabilized products and gas. Incineration oxidizes combustible organics at high temperature; wet oxidation oxidizes organics in the aqueous phase under elevated conditions. Magnetic separation targets magnetic material rather than organic destruction. Therefore **A, B, D**.

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