Potable Water

Question 1

Potable water

Answer 1

Water that is safe to drink (low levels of dissolved salts, free of microbes)

Question 2

Potable water from ground water

Answer 2

1) screening to remove large solids
2) sedimentation for sand and soil to settle to bottom
3) chemicals added to collect small particles
4) sterilisation (chlorine, UV, ozone)
5) pH checking

Question 3

Potable water from salt water (desalination)

Answer 3

Either distillation or reverse osmosis which are very expensive

Question 4

Sewage treatment

Answer 4

1) screening to remove large solids
2) sedimentation to produce effluent and sewer sludge
3) anaerobic digestion of sewer sludge
4) aerobic biological treatment of effluent
5) sterilisation to kill microbes or release into rivers