C14.3 - Treating waste water
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Last updated 7:47 PM on 1/6/26
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5 Terms
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Screening
Large objects removed from the sewage using a metal grid
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Primary treatment
Solid sediments allowed to settle and the sludge is pumped to a storage tank. The effluent moves to the next tank
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Secondary treatment
Useful bacteria added to break down harmful microorganisms aerobically
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Final treatment
Useful bacteria allowed to settle and can be reused or put with sludge
It can be put through a bed of sand and sterilised with UV light or chlorine
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Uses of sludge
Can be dried and used for:
burn to generate electricity
fertiliser
