potable water

Question 1

process for potable water

Answer 1

• fresh water in reservoirs (not yet potable as contains microbes)
• first the water is screened to remove solids
• then the water is sterilised ( adding chlorine uv and ozone)
• then add fluoride for dental health
  now you have potable water

Question 2

define potable water

Answer 2

water with a low concentration of salts, minerals , and microbes

Question 3

what are the 3 sources of waste water

Answer 3

domestic
agricultural
industrial

Question 4

what are the 2 ways to desalinate sea water

Answer 4

reverse osmosis

distillation

Question 5

explain what happens in desalination in terms of reverse osmosis and distillation

Answer 5

1. distillation
   - heat the water till it evaporates
   - let it cool and condense
   - collect
2. reverse osmosis
   - semi permeable membrane
   - force through with pressure

this then results in pure water

Question 6

what is the disadvantage of distillation

Answer 6

• uses a lot of energy
  which is expensive
  = greenhouse gases

Question 7

what is the disadvantage of reverse osmosis

Answer 7

• have to replace the membrane

= expensive