Waste Water Treatment (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards
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Contents of human waste
Contents of human waste
Harmful bacteria & high 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 & pesticides
Purpose of coarse filter in water treatment
Purpose of coarse filter in water treatment
Remove large particles & debris (first step)
Sedimentation process
Sedimentation process
Larger solid particles settle under gravity
Sewage sludge definition
Sewage sludge definition
Solid waste that settles at bottom during sedimentation
Effluent definition
Effluent definition
Liquid on top after sedimentation with dissolved pollutants
Fine filtration materials
Fine filtration materials
Layers of sand & gravel to remove small insoluble particles
Products of anaerobic digestion of sludge
Products of anaerobic digestion of sludge
Reduced sludge volume & biogas (renewable energy)
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
Environmental benefit of wastewater treatment
Environmental benefit of wastewater treatment
Protects natural water bodies from pollution & ecological damage
Public health benefit of wastewater treatment
Public health benefit of wastewater treatment
Prevents disease spread & protects from harmful chemicals
Sustainability aspect of wastewater treatment
Sustainability aspect of wastewater treatment
Key to managing water resources sustainably in scarce areas