Civil Services Prep

Prelims 2024 · Environment · Question 86

Consider the following materials: 1. Agricultural residues 2. Corn grain 3. Wastewater treatment sludge 4. Wood mill waste. Which of the above can be used as feedstock for producing Sustainable Aviation Fuel?

  1. 1 and 2 only
  2. 3 and 4 only
  3. 1, 2, 3 and 4
  4. 1, 3 and 4 only

Answer

1, 2, 3 and 4

1. Agricultural residues — Yes. Crop residues are recognized biomass feedstock for SAF through pathways like alcohol-to-jet, gasification/Fischer-Tropsch, etc. Verdict: Correct.

2. Corn grain — Yes. Corn can be converted to ethanol and then to jet fuel under approved SAF pathways. Verdict: Correct.

3. Wastewater treatment sludge — Yes. Sewage/wastewater sludge can be processed into biofuels/biocrude and is considered a waste-based SAF feedstock. Verdict: Correct.

4. Wood mill waste — Yes. Forestry and wood-processing residues are standard lignocellulosic feedstocks for SAF production. Verdict: Correct.

Since 1, 2, 3 and 4 can be used as feedstock for Sustainable Aviation Fuel, the correct answer is (c).

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