Waste Water

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15 Terms

1
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What are the three main sources of waste water
Domestic, agricultural and industrial
2
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What is the first step of sewage treatment
Screening to remove any large objects
3
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What process occurs in stage 2 of sewage treatment
Sedimentation
4
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What is sedimentation
Where heavier parts of the sewage sink to the bottom and lighter parts sit at the top of the tank
5
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What two things are we left with after sedimentation
Sludge and effluent
6
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What breaks down the effluent and the sludge
Microorganisms
7
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What condition is the effluent in during breakdown
Aerobic
8
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What condition is the sludge in during breakdown
Anaerobic
9
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After breakdown has occurred, what happens to the effluent
Released back into the environment
10
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What does anaerobic respiration of the sludge produce
Methane
11
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What is the methane used for
Burnt as an energy source
12
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What is the remaining waste from the sludge used for
Fertilisers
13
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Why is it good to use as a fertiliser
Rich in nutrients
14
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What two ways are used to remove toxic substances from water
Adding chemicals or UV
15
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What is the benefit of sewage treatment over desalination
Easier