Potable Water Flashcards
What is potable water
Water that is safe to drink
What is pure water
water that contains only h2o
What are the 3 requirements for potable water
low amount of dissolved substance
no microorganisms involved
pH between 6.5 and 8.5
What are the two places we can get water from
fresh water sources
sea water
Within fresh water sources what are the two sub sections and their examples
ground water like aquifers underground
surface water like lakes
How do we treat fresh water to make it potable (3 steps)
filtration using wire mesh - remove twigs
sedimentation - remove finer grit
Sterilisation - kill microbes
What is it called to get potable water from sea water
desalination
What are the 3 sterilisation methods
bubble Cl through it
expose to ozone
expose to UV light
What are the two desalination methods
distillation
reverse osmosis
What happens in distillation technique
efffectively like simple distillation in school to get pure water
What happens in reverse osmosis
salt water passed through a membrane
ONLY water molecules pass through
ions and larger molecules are trapped so get pure distilled water
