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Potable water & Water treatment (Potable water (How Produced? (UK…
Potable water & Water treatment
Potable water
naturally safe or treated for humans to drink
not pure, lots of dissolved substances
Important
levels of dissolved salts not too high,
pH between 6.5 and 8.5
no nasties like micobes in it
How Produced?
Depends on where you are, local conditions and availability
Rainwater is type of fresh water (not much dissolved in it)
Rain
surface water
lakes, rivers
ground water
in rocks called aquifers that trap water
UK
choose appropriate source of fresh water
Pass it through filter beds
Sterilising
agents include chlorine, ozone or UV light
If supplies limited
Desalination of salty water or sea water
distillation
reverse osmosis
Both need large amount of energy
Waste Water Treatment
Waste water produced by
urban lifestyles
industrial processes
Sewage and agricultural waste
remove organic matter
remove harmful microbes
industrial waste remove
organic matter
harmful chemicals
Sewage treatment includes
screening and grit removal
sedimentation to produce sludge and effluent
anaerobic treatment of sewage sludge
aerobic biological treatment of effluent
How easy is it?