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 ?
Show answer
Answer: C. Sustainable Aviation Fuel (SAF) is jet fuel made from biological and waste sources. It can be made from agricultural residues, corn grain (via ethanol), wastewater treatment sludge and wood mill waste, along with used cooking oil, algae and other wastes. So all four can be feedstocks.
Watch for: Students drop corn grain because it is food, but corn ethanol is already a major SAF feedstock.
Why the other options are wrong
- A. Wrong because sludge and wood mill waste are also SAF feedstocks.
- B. Wrong because farm residues and corn grain are also SAF feedstocks.
- D. Wrong because corn grain is also used to make SAF through the alcohol-to-jet route.
Source to check: US Department of Energy, Alternative Fuels Data Center, 'Sustainable Aviation Fuel' (feedstocks); Bioenergy Technologies Office (energy.gov)
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.