Potable water Flashcards
What is potable water?
Water that is safe to drink.
Potable water is not pure water because it contains _______________________.
dissolved impurities
What 2 reasons why must potable water have sufficiently low levels of dissolved salts and microbes?
1.
2.
- Dissolved salts can be harmful for humans.
- Microbes can cause illnesses.
How is ground water extracted to make potable water?
___________ through ______________.
To remove ____________ particles.
Then ____________ using _____________________ to kill _____________.
Filtered
filter beds
insoluble
sterilised
UV rays or chlorine
microbes
How is waste water extracted to make potable water?
Goes through _________________________, then sedimentation is carried out to produce ______________________.
The effluent is ______________ treated to _______________________.
Then ______________ using ____________________ to kill microbes.
The sludge is ___________________________ to remove _______________.
screening and grit removal
sewage sludge and effluent
aerobically
reduce solid waste
sterilised
chlorine or UV rays
anaerobically digested by bacteria
organic matter
What are 2 reasons it is easier to obtain potable ground water rather than potable waste water?
Fewer processes.
Takes less time.
What is desalination?
The removal of salt from water.
Desalination requires a lot of ___________.
energy
What are 2 processes of desalination?
Distillation.
Reverse osmosis.
What is the process of distillation?
Sea water is heated until it _______.
The salt _________ in the liquid, and the steam is _____________.
The steam is _____________________ to make potable water.
boils
remains
pure water
cooled and condensed
What is the process of reverse osmosis?
When water is put under _________________ and passed through a _________________ which has _____________.
The pores allow water molecules through, but prevent most __________________ from passing through.
high pressure
membrane
tiny pores
ions and molecules
Practical; Analysis and purification of water:
Test the pH of each sample using either a ______________________ and a _______________.
For each sample of water, pour a suitable amount into a clean, ____________________________.
Heat gently over a ______________________________ until ______________________.
Allow to cool, then weigh the evaporating basin again and calculate the ___________________________ in the evaporating basin.
universal indicator
colour chart
pre-weighed evaporating basin
Bunsen burner, tripod and gauze
no liquid remains
mass of solid that remains
