Which of the following methods are used in Solid Waste Management?
1. Pyrolysis
2. Root Zone treatment
3. Pulverisation.
4. Incineration
Select the correct answer using the code given below:
(A) 1, 2 and 4 only
(B) 1, 2 and 3 only
(C) 1, 3 and 4 only
(D) 1, 2, 3 and
Ans:C
Explanation:
Pyrolysis is a method of solid waste management whereby solid wastes are chemically decomposed by heat without the presence of oxygen. This usually occurs under pressure and at temperatures of up to 430 degrees Celsius.
The root zone is a wastewater treatment system, and not a solid waste management method. It makes use of biological and physical-treatment processes to remove pollutants from wastewater.
Pulverisation is a method used to reduce the solid waste into
dust or powder by pounding or grinding.
Incineration involves burning of solid wastes at high temperatures
until the wastes are turned into ashes. Incinerators are made in such a way that they do not give off extreme amounts of heat when burning solid wastes.