What would be the correct sequence of the treatment process from start to finish for drinking water? Choose the correct answer from the options given below.

1.Filtration

2.Disinfection

3.Gravitational settlement of large particles

4.Flocculation

A1, 2, 3, 4

B1, 2, 4, 3

C3, 4, 1, 2 ✓ Correct

D3, 4, 2, 1

Correct answer: (C) 3, 4, 1, 2

Explanation

Water is first cleared of large particles, then chemically clumped, then filtered, and finally disinfected.

Gravitational settlement of large particles comes first to drop out the heaviest solids.

Flocculation follows, making fine suspended particles clump into larger flocs.

Filtration then strains out the remaining flocs and fine matter.

Disinfection is last, killing pathogens before the water is supplied.

Chlorine or ozone is commonly used in the final disinfection step.

Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.