POTABLE WATER Flashcards
1
Q
define pure water
A
only contains water as there are no dissolved substances
2
Q
define potable water
A
water with a low concentration of microbes and dissolved substances so it is safe to drink
3
Q
In the UK what is the main source of potable water
A
rain (water)
4
Q
where does rainwater collect
A
aquifers
lakes
rivers
reservoirs
5
Q
process to produce potable water
A
- choose a good source of fresh water (a river)
- pass the water through filter beds to remove leaves or suspended particles
- sterilize the water with UV, ozone, and chlorine to kill the microbes
- add fluoride for dental health
6
Q
what does desalination do
A
reduces the level of dissolved minerals down to an acceptable level for potable water
7
Q
what are the 2 ways to desalinate water
A
distillation
reverse osmosis
8
Q
what are the negatives to desalination processes
A
- requires large amounts of energy which makes them very expensive
