Water treatment (Edexcel GCSE Chemistry Combined Science): Flashcards
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Practise the cards
15 cards from this deck
Substances in human waste
Substances in human waste
Harmful bacteria & high nitrogen compounds
Impact of human waste on aquatic ecosystems
Impact of human waste on aquatic ecosystems
Depletes oxygen levels & 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
Purpose of coarse filter in water treatment
Purpose of coarse filter in water treatment
Removes large particles & debris (first step)
What happens during sedimentation
What happens during sedimentation
Larger solid particles settle under gravity
What is sewage sludge
What is sewage sludge
Solid waste that settles at bottom during sedimentation
What is effluent
What is effluent
Liquid on top after sedimentation with dissolved pollutants
What does fine filtration use
What does fine filtration use
Layers of sand & gravel to remove smaller particles
Process of anaerobic digestion
Process of anaerobic digestion
Bacteria break down sewage sludge without oxygen
Products of anaerobic digestion of sludge
Products of anaerobic digestion of sludge
Reduced sludge volume & biogas (renewable energy)
Process of aerobic treatment of effluent
Process of aerobic treatment of effluent
Aerobic bacteria (need oxygen) break down organic matter
Purpose of chlorination in water treatment
Purpose of chlorination in water treatment
Kills bacteria, prevents disease, makes water safe to drink
Why is wastewater treatment environmentally important
Why is wastewater treatment environmentally important
Protects natural water bodies from pollution & ecological damage
Sustainability benefit of wastewater treatment
Sustainability benefit of wastewater treatment
Manages water resources sustainably, esp. where water is scarce