Which out of the following does not help in disinfecting water?

Question

Question

This question was previously asked in

JKSSB JE Civil Jal Shakti 5 Dec 2022 Official Paper (Shift 2)

Answer 1

Explanation :

Filtration :

Filtration is a process used to separate solids from liquids or gases by using a filter medium that allows fluid to pass through but not solid.
Filtration can be mechanical-biological or physical.
It does not help in disinfecting water.
If you want to disinfect the water you can boil it or you can use alum for chlorine tablets.

Methods of disinfection:

Chlorine gas is mostly used as a water disinfectant.
Introducing chlorine to water plays a very effective role in removing almost all pathogenic microorganisms
A pinch of alum added to water removes the solid impurities.
Once the sediment is thrown away, the water is boiled to kill bacteria.

Alum:

Alum or Aluminium sulfate is most commonly used as a coagulant in water treatment.
Coagulants are used to enlarge the size of the impurities so that they settle down in sedimentation tanks.
Alum is also effective in killing pathogens present in the water. This process is known as Disinfection.