water treatment
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11 Terms
sedimentation
static water suspended solids settle
screening
metal grills and mesh remove large vegetation and litter
aeration
bubbles of air or water sprays aerate water ensuring a high oxygen content
flocculation
clay particles
electrostatic forces on surface repel neutralised by adding flocculants mixed with water
clarifier tank allowed to settle
filtration
filters used to remove remaining suspended solids
activated carbon filters
particles of carbon used to remove organic chemicals such as pesticides which adsorb onto carbon particles
sterilisation
add uv cl or o3
kills pathogens
ph control
crushed lime
fluoridation
fluorides improve dental health
ion exchange
toxic ions eg lead mercury arsenic can be removed from water using ion exchange resins
toxic ions adsorb onto polymer beads
reverse osmosis
high pressure
partially permeable membrane of very small polyamide tubes
Note 
Flashcards (63)