Waste Water Treatment (AQA GCSE Chemistry Combined Science): Flashcards
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What does human waste contain?
What does human waste contain?
Harmful bacteria and high levels of nitrogen compounds
What is the impact of human waste on aquatic ecosystems?
What is the impact of human waste on aquatic ecosystems?
Depletes oxygen levels and promotes excessive algae growth
What do industrial waste waters contain?
What do industrial waste waters contain?
Harmful chemicals including toxic metal compounds
What does agricultural waste water contain?
What does agricultural waste water contain?
Fertilisers and pesticides
What is the impact of agricultural waste on ecosystems?
What is the impact of agricultural waste on ecosystems?
Nutrient pollution, algal blooms, loss of biodiversity
What is the purpose of coarse filter in waste water treatment?
What is the purpose of coarse filter in waste water treatment?
Remove large particles and debris from wastewater
What happens during sedimentation?
What happens during sedimentation?
Larger solid particles settle under gravity
What are the two products of sedimentation?
What are the two products of sedimentation?
Sewage sludge (solid waste) and effluent (liquid)
What materials are used in fine filtration?
What materials are used in fine filtration?
Layers of sand and gravel
What are the conditions for anaerobic digestion of sewage sludge?
What are the conditions for anaerobic digestion of sewage sludge?
Bacteria break down sludge in absence of oxygen
What are the products of anaerobic digestion?
What are the products of anaerobic digestion?
Reduced sludge volume and biogas (renewable energy)
What is the purpose of aerobic treatment of effluent?
What is the purpose of aerobic treatment of effluent?
Bacteria break down remaining organic matter using oxygen
What is the purpose of chlorination in water treatment?
What is the purpose of chlorination in water treatment?
Kill bacteria and make water safe to drink