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GATE 2023 CE (CE1) – Question 45

Water and Waste Water Quality and Treatment · Unit processes and operations · 2 marks · Multiple choice

In the following table, identify the correct set of associations between the entries in Column-1 and Column-2.

Column-1Column-2
P: Reverse OsmosisI: Ponding
Q: Trickling FilterII: Freundlich Isotherm
R: CoagulationIII: Concentration Polarization
S: AdsorptionIV: Charge Neutralization
  1. P-II, Q-I, S-III
  2. Q-III, R-II, S-IV
  3. P-IV, R-I, S-II
  4. P-III, Q-I, R-IV

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Correct answer: (D) P-III, Q-I, R-IV

Explanation

Reverse osmosis suffers from concentration polarization (P-III). A trickling filter can suffer from ponding when the media clog (Q-I). Coagulation works by charge neutralization of the colloids (R-IV). Adsorption is described by the Freundlich isotherm (S-II). Option D has the three correct pairs it lists.