Water Flashcards
What can drinking water not have
- low levels of dissolved salts
- low levels of microbes
What is later safe to drink called
Potable water
Why is pure and potable water not the same thing
Pure water contains no dissolved substances but potable water does
Sources of fresh water
Aquifers
Lakes
Rivers
Steps for fresh water
Filtration - to remove suspended material
Sterilisation - chlorine/ ozone light to kill microbes
How to make sea water drinkable
Desalination
ways to make sea water drinkable
Why not?
Distillation
Reverse osmosis
Lots of energy which is expensive
Why is waste water harder to process then fresh water
More processes
More microbes and more organic matter
How to determine wether water is pure
Determine boiling point
Should be at 100
Waste water treatment
Screened - passed through mesh to remove solids
Settle in sedimentation tank
Liquid effluent and solidsludge
What happens to semi solid sludge
Digested anaerobic bacteria - produces biogas to burn for electricity
Digested sludge then used as fertiliser
What does liquid effluent contain
Lots of organic molecules
Harmful microorganisms
What happens to liquid effluent
Air is bubbled through this allows AEROBIC BACTERIA. After can be put back into rivers etc
Problem with low grade ores
Contain little copper
What is phytomining
Plants are grown in ground which contains the metal
Steps phytpmining
Grown in areas with lots of the metal ore
That’s all the metal compound and concentrated in its tissue
Harvested and burned
Ash contains high concentration
What is bioleaching
Using bacteria
Bioleaching steps
Bacteria mixed with the low grade ore
Produce leachate with ore
What do we have at the end of photomining and bioleaching
Metal compound need to extra metal
How to. Displace if copper
Using scrap iron because it is more reactive and cheap
Electrolysis
What is potable water
Water that is safe to drink
Purpose of making potable water
Reduce levels of dissolved substances
