Question

There are __________ ways to treat waste thermally.

(a) 5

(b) 3

(c) 2

(d) 6

I had been asked this question in a national level competition.

Query is from Solid Waste Management topic in section Other Major Topics in Civil Engineering of Basic Civil Engineering

Answer 1

Right choice is (b) 3

To elaborate: The process which use heat to treat the waste are referred to as a thermal treatment. These include incineration (combustion of waste & recover energy for electricity/heating), pyrolysis (decomposition of organic waste with low oxygen and high temperature), and open burning (environmentally harmful and mostly practical).