Water (AQA GCSE Chemistry): Flashcards
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Practise the cards
15 cards from this deck
Potable water
Potable water
Water that is safe for humans to drink
Requirements for potable water
Requirements for potable water
Clean, free from harmful substances, low dissolved salts, no dangerous microbes
Three steps of water treatment
Three steps of water treatment
Collection, filtration, sterilisation
Where fresh water is collected from
Where fresh water is collected from
Rivers, lakes, or underground sources
What filters water in treatment
What filters water in treatment
Filter bed with sand and pebbles
Sterilisation in water treatment
Sterilisation in water treatment
Killing dangerous microbes in water
Three sterilisation methods
Three sterilisation methods
Chlorine gas, ozone, UV light
Desalination
Desalination
Removing salt from seawater
Two desalination methods
Two desalination methods
Distillation and reverse osmosis
Why desalination is expensive
Why desalination is expensive
Requires lots of energy
Wastewater
Wastewater
Dirty water from homes and factories with organic matter and microbes
Sewage treatment Stage 1
Sewage treatment Stage 1
Screening and removing grit
Sewage treatment Stage 2
Sewage treatment Stage 2
Sedimentation - solids settle to bottom
Sewage treatment Stage 3
Sewage treatment Stage 3
Anaerobic digestion - microbes break down solids without air
Sewage treatment Stage 4
Sewage treatment Stage 4
Aerobic treatment - microbes with air, produces clean effluent