Water Purification

Question 1

How is most potable water produced?

Answer 1

• choosing an appropriate source of fresh water
• passing the water through filter beds
• sterilising

Question 2

What are the three types of sterilising agents for potable water?

Answer 2

• chorine
• ozone
• UV light

Question 3

How do you make potable water from salt water?

Answer 3

• remove salt from salty water
• distillation

Question 4

What is the difference between potable water and pure water?

Answer 4

• potable water is safe to drink but till contains dissolved substances
• pure water is only H2O

Question 5

How is sewage treated?

Answer 5

• screening and grit removal
• sedimentation to produce sewage sludge and effluent
• anaerobic digestion of sewage sludge
• Aerobic biological treatment of effluent

Question 6

What is the test for pure water?

Answer 6

Boiling, if boils at 100 degrees, know its water

Question 7

How is sewage sludge treated before being released back into the environment?

Answer 7

• anaerobic digestion