Question

Identify the correct sequence for tanks used for water purification in most of the water treatment plants.

• A. 1) Loading tank
  2) Sedimentation tank
  3) Filtration tank
  4) Chlorination tank
• B. 1) Filtration tank
  2) Loading tank
  3) Sedimentation tank
  4) Chlorination tank
• C. 1) Chlorination tank
  2) Loading tank
  3) Sedimentation tank
  4) Filtration tank
• D. 1) Sedimentation tank
  2) Loading tank
  3) Filtration tank
  4) Chlorination tank

Answer 1

The correct option is D 1) Sedimentation tank

2) Loading tank
3) Filtration tank
4) Chlorination tank
Dirty water is first made to undergo sedimentation to remove solid impurities that settle down at the bottom. Then the water passes through loading tank, where alum helps in settling down of suspended solid impurities. Then water is passed through filtration tank, where layers of gravels and rock particles are present to remove the impurities which are still present in water. Chlorination is the last step by which water is disinfected to give clean water.