Sewage Treatment

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6 Terms

1
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Why is treating sewage important? What is eutrophication?

  • prevents the spread of diseases

  • eutrophication = too many nutrients dumped form sewage = algae grow out of control and consume all the oxygen, fishes die .

2
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What happens during the primary treatment? What is sludge?

  • getting rid of large solids

  • Sludge = large stuff that settles

3
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What happens during secondary treatment?

  • Remove biological material

  • Stater cultures of activated sludge are sued to start new tanks

  • Bacteria aerobically consume most of the remaining BOD

4
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What happens after secondary treatment? Is water ready to be released? 

  • If released into water supply , chlorination only 

  • If reused as drinking water, additional steps: 

    • membrane filter 

    • ozone treatment 

5
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What is tertiary treatment? 

additional removal of BOD in man-made lagoons or wetlands. 

6
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What is sludge digestion? Is it aerobic or anaerobic? What done with the final, treated sludge?

  • sludge is collected in anaerobic sludge digesters

  • methane gas produced

  • stabilized sludge is disposed of in landfills