Welcome to the Quiz!
This quiz contains 8 questions from a mix of 1 subtopics.
Is nutrient run-off from fields an example of domestic, agricultural, or industrial waste?
Industrial
Domestic
Agricultural
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Is used shower water an example of domestic, agricultural, or industrial waste?
Industrial
Agricultural
Domestic
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Are the chemicals released from manufacturing factories an example of domestic, agricultural, or industrial waste?
Domestic
Industrial
Agricultural
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True or false? Waste water is usually returned to the environment without processing.
True
False
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Which two of the following are removed from sewage and agricultural waste water before the water is returned to the environment?
Harmful microbes
Salts
Organic matter
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Steps in the treatment of sewage
sealed / oxygen / nitrogen / large / effluent / sludge
- Screening - The sewage is passed through gratings and meshes to remove anything .
- Sedimentation - The sewage is left to sit in a settlement tank, so that the heavier particles settle at the bottom as , while the lighter particles settle at the top as .
- Aerobic digestion - Air is pumped through the effluent to supply the bacteria with
- Anaerobic digestion - The sludge is in a container to prevent the entry of air, which ensures anaerobic respiration.
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Which gaseous product does the anaerobic digestion of sludge produce?
Nitrogen
Sulfur dioxide
Oxygen
Methane
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True or false? Anaerobic digestion of sludge results in fertiliser that be spread on fields.
True
False
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