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15 cards from this deck
Harmful bacteria & high nitrogen compounds
Depletes oxygen & promotes excessive algae growth
Harmful chemicals & toxic metal compounds
Fertilisers & pesticides
Remove large particles & debris (first step)
Larger solid particles settle under gravity
Solid waste that settles at bottom during sedimentation
Liquid on top after sedimentation with dissolved pollutants
Layers of sand & gravel to remove small insoluble particles
Reduced sludge volume & biogas (renewable energy)
Aerobic bacteria break down remaining organic matter
Kill bacteria, prevent disease, make water safe to drink
Protects natural water bodies from pollution & ecological damage
Prevents disease spread & protects from harmful chemicals
Key to managing water resources sustainably in scarce areas
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