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12 questions from this quiz
High levels of nitrogen compounds
Depletes oxygen & promotes algae growth
Harmful chemicals & toxic metal compounds
Nutrient pollution & algal blooms
To remove large particles and debris
Sewage sludge and effluent
Layers of sand and gravel
In the absence of oxygen
Biogas as renewable energy
Remaining organic matter
To kill bacteria and prevent disease
It manages water resources, key where scarce
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