Question

________ % of waste by weight remains after combustion.

(a) 20-35

(b) 20-40

(c) 40-50

(d) 30-50

The question was asked in an international level competition.

My question comes from Thermal Treatment topic in chapter Thermal Processes of Hazardous Waste Management

Answer 1

Right choice is (a) 20-35

Easiest explanation: 20-35% of waste by weight remains after combustion and 90% of waste volume reduction is achieved.