5.10.1.2 potable water

Question 1

For humans,
drinking water should have?

Answer 1

sufficiently low levels of dissolved salts
and microbes

Question 2

what is potable water?

Answer 2

water that is safe to drink

Question 3

Potable water is not pure water in the chemical sense because it
contains?

Answer 3

dissolved substances

Question 4

In the United Kingdom (UK), rain provides?

Answer 4

water with low levels of
dissolved substances (fresh water) that collect in the ground and in
lakes and rivers

Question 5

most potable water is produced by?

Answer 5

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

Question 6

Sterilising agents used for potable water include

Answer 6

chlorine, ozone or
ultraviolet light.

Question 7

If supplies of fresh water are limited?

Answer 7

desalination of salty water or
sea water may be required

Question 8

how can desalination be done?

Answer 8

Desalination can be done by distillation
or by processes that use membranes such as reverse osmosis
–> These processes require large amounts of energy

Question 9

Urban lifestyles and industrial processes?

Answer 9

produce large amounts of
wastewater that requires treatment before being released into the
environment.

Question 10

Sewage and agricultural waste water require?

Answer 10

removal
of organic matter and harmful microbes

Question 11

Industrial waste water may
require removal of?

Answer 11

organic matter and harmful chemicals.

Question 12

Sewage treatment includes:

Answer 12

screening and grit removal
* sedimentation to produce sewage sludge and effluent
* anaerobic digestion of sewage sludge
* aerobic biological treatment of effluent.