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15 cards from this deck
Harmful bacteria & high nitrogen compounds
Depletes oxygen levels & promotes excessive algae growth
Harmful chemicals & toxic metal compounds
Fertilisers & pesticides
Removes 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 smaller particles
Bacteria break down sewage sludge without oxygen
Reduced sludge volume & biogas (renewable energy)
Aerobic bacteria (need oxygen) break down organic matter
Kills bacteria, prevents disease, makes water safe to drink
Protects natural water bodies from pollution & ecological damage
Manages water resources sustainably, esp. where water is scarce
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