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13 cards from this deck
Harmful bacteria and high levels of nitrogen compounds
Depletes oxygen levels and promotes excessive algae growth
Harmful chemicals including toxic metal compounds
Fertilisers and pesticides
Nutrient pollution, algal blooms, loss of biodiversity
Remove large particles and debris from wastewater
Larger solid particles settle under gravity
Sewage sludge (solid waste) and effluent (liquid)
Layers of sand and gravel
Bacteria break down sludge in absence of oxygen
Reduced sludge volume and biogas (renewable energy)
Bacteria break down remaining organic matter using oxygen
Kill bacteria and make water safe to drink
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