Question

Arrange the following methods in the sequence they are performed in a water treatment process:

• A. Sedimentation
• B. Screening
• C. Chlorination
• D. Filtration

Answer 1

$\bullet$ Screening is the first stage in the water treatment process. By screening we remove bigger chunks of wastes right in the beginning of the treatment.
$\bullet$ In sedimentation, the impurities settle down because they are heavier.
$\bullet$ Chlorination is a process of passing chlorine gas through dirty water to kill germs.
$\bullet$ In filtration, the water is filtered through sand.