Question

Heating of solid wastes in an oxygen free atmosphere is called

• A. Pyrolysis
• B. Thermal decomposition
• C. Carbonization
• D. Incineration

Hint:

Waste treatment processes: \[ \boxed{ \begin{aligned} \text{Pyrolysis} &\rightarrow \text{Heating without oxygen}\\ \text{Incineration} &\rightarrow \text{Burning with excess oxygen} \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Separate the four thermal processes.
Incineration burns waste with plenty of oxygen, carbonization and general thermal decomposition can happen with or without air, but pyrolysis is specifically defined by the absence of oxygen.
Step 2: Focus on the oxygen condition given.
The question specifically says the waste is heated in an oxygen free atmosphere, which is the one defining feature that separates pyrolysis from the other three terms.
Step 3: Match the process.
Heating organic waste with no oxygen present, breaking it down into gas, liquid, and char products, is called pyrolysis.
\[ \boxed{\text{Pyrolysis}} \]