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12 questions from this quiz
Harmful bacteria and nitrogen compounds
Depletes oxygen and promotes algae growth
Harmful chemicals and toxic metal compounds
Algal blooms and loss of biodiversity
Remove large particles and debris
Sewage sludge and effluent
Solid waste settling at the bottom
Liquid remaining with dissolved pollutants
Layers of sand and gravel
Biogas for renewable energy
Bacteria that require oxygen
Kill bacteria and make water safe to drink
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