Water treatment Flashcards
1
Q
7 types of water treatment (in order!)
A
Screening
Flocculation
Settling/Sedimentation
Filtration
Chlorination
Fluoridation
pH Adjustment
2
Q
Screening
A
Water passes through the wire mesh to remove debris
3
Q
Flocculation
A
Aluminium sulphate is added to coagulate the molecules to form larger ones
4
Q
Sedimentation/Settling
A
The water settles at the bottom and the clear water flows from the top
5
Q
Filtration
A
Water passes through sand bed to remove last suspended solids
6
Q
Chlorination
A
Chloride is added to kill bacteria, no change to taste
7
Q
Fluoridation
A
Fluoride is added to prevent cavities
8
Q
pH Adjustment
A
Sulphide acid is added because water is too basic. Too much causes corrosion in pipes. Too much calcium hydroxide causes water hardness
