Water treatment (Edexcel GCSE Chemistry): Flashcards
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13 cards from this deck
Contents of human waste
Contents of human waste
Harmful bacteria & high levels of nitrogen compounds
Impact of human waste on aquatic ecosystems
Impact of human waste on aquatic ecosystems
Depletes oxygen & promotes excessive algae growth
Contents of industrial waste water
Contents of industrial waste water
Harmful chemicals & toxic metal compounds
Contents of agricultural waste water
Contents of agricultural waste water
Fertilisers and pesticides
Impact of agricultural waste
Impact of agricultural waste
Nutrient pollution, algal blooms, loss of biodiversity
Purpose of coarse filter
Purpose of coarse filter
Remove large particles & debris
Sedimentation process
Sedimentation process
Larger solid particles settle under gravity
Sewage sludge
Sewage sludge
Solid waste that settles at the bottom
Effluent
Effluent
Liquid on top with dissolved pollutants
Materials used in fine filtration
Materials used in fine filtration
Layers of sand and gravel
Anaerobic digestion of sewage sludge
Anaerobic digestion of sewage sludge
Bacteria break down sludge without oxygen, produce biogas
Purpose of aerobic treatment of effluent
Purpose of aerobic treatment of effluent
Aerobic bacteria break down remaining organic matter
Purpose of chlorination
Purpose of chlorination
Kill bacteria, prevent disease, make water safe to drink