Which of the following technologies are used to generate energy from waste?
A. Gassification
B. Thermal depolymerization
C. Pyrolysis
D. Plasma arc gassification
E. Ecosan
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A, B, C and D only
Gasification converts waste into syngas with a limited supply of oxygen, pyrolysis decomposes it thermally in the absence of oxygen to give oil, char and gas, thermal depolymerization breaks long-chain polymers and organic waste into light crude oil, and plasma arc gasification uses an electric arc at several thousand degrees to reduce waste to syngas and inert slag. All four are waste-to-energy routes.
Ecosan (ecological sanitation) is a dry, closed-loop toilet system that recovers nutrients from human excreta for use as manure; it is a sanitation and nutrient-recycling technology, not an energy-recovery one.