Waste Water Treatment (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards
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13 cards from this deck
Contents of human waste
Contents of human waste
Harmful bacteria & high nitrogen compounds
Impact of human waste on ecosystems
Impact of human waste on 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 & pesticides
Impact of agricultural waste
Impact of agricultural waste
Nutrient pollution, algal blooms, biodiversity loss
Purpose of coarse filter
Purpose of coarse filter
Remove large particles & debris (1st treatment step)
Sedimentation process
Sedimentation process
Larger solid particles settle under gravity
Sewage sludge definition
Sewage sludge definition
Solid waste settling at bottom during sedimentation
Effluent definition
Effluent definition
Liquid on top after sedimentation w/ dissolved pollutants
Purpose of anaerobic digestion
Purpose of anaerobic digestion
Reduce sludge volume & produce biogas (renewable energy)
Conditions for anaerobic digestion
Conditions for anaerobic digestion
Bacteria break down sludge without oxygen
Purpose of aerobic treatment
Purpose of aerobic treatment
Bacteria break down organic matter in effluent using oxygen
Purpose of chlorination
Purpose of chlorination
Kill bacteria, prevent disease, make water safe to drink