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Wastewater Treatment

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Wastewater Treatment CE 326 Principles of Environmental Engineering Prof. Tim Ellis Spring 2008 Wastewater generation Collection Systems Separate sewers Combined ... – PowerPoint PPT presentation

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Title: Wastewater Treatment


1
Wastewater Treatment
  • CE 326 Principles of Environmental Engineering
  • Prof. Tim Ellis
  • Spring 2008

2
Wastewater generation
3
Collection Systems
  • Separate sewers
  • Combined sewers

Combined sewer overflows
Photo courtesy of Water Environment Federation
Collection Systems Committee cMOM Subcommittee
4
Regulations Federal Water Pollution Control
Legislation, US
Federal Water Pollution Control Act Amendments
of 1972(Clean Water Act)
Federal Water Pollution Control Act of 1956
Clean Water Act of 1977
Water Quality Act of 1965
Ocean Dumping Ban Act of 1988
Refuse Act of 1899
Clean Water Restoration Act of 1966
Water Quality Act of 1987
Water Pollution Control Act of 1948
Amendments to the FWPCA of 1961
Municipal Wastewater Treatment Construction Grant
Amendments of 1981
5
(No Transcript)
6
Four levels of wastewater treatment
  • P_______________
  • Screens
  • Grit removal
  • P_______________
  • Solids settling
  • S_______________
  • Biological treatment
  • Settling of biological solids
  • T______________
  • Filtration

7
Wastewater TreatmentPreliminary Treatment
  • Screens
  • sticks, rocks, logs, shoes, dead animals, etc.
  • Grit Removal
  • grit causes undue wear downstream unit processes

8
Preliminary TreatmentScreens
  • Bar Screens
  • Bar Racks

9
Preliminary Treatment grit removal
10
Secondary Treatment
  • Biological treatment
  • Classification of microorganisms by their c______
    and e______ source.

11
Secondary Treatment
  • H________________
  • Utilize organic matter to supply their carbon and
    energy needs.
  • These are the predominant organisms in biological
    wastewater treatment plants, responsible for
    converting organic pollutants to
  • carbon dioxide,
  • water, and
  • additional heterotrophic biomass.

12
Secondary Treatment
  • A________________
  • get their energy from an inorganic source and
  • their carbon from carbon dioxide.
  • An example of autotrophs in wastewater treatment
    is nitrifying bacteria.
  • Nitrifiers use ammonia for energy and carbon
    dioxide for a carbon source.
  • End products of nitrification are
  • nitrate,
  • water, and
  • hydrogen ions
  • additional nitrifying (autotrophic) biomass.

13
Biological Treatment
  • Classification of microorganisms by their
    t__________ e__________ a__________

14
Terminal electron acceptor
  • A___________
  • microorganisms transfer electrons from the energy
    source to oxygen, O2.
  • In the process oxygen and organic matter is
    converted to carbon dioxide, CO2, and water, H2O.
  • Oxygen is termed the terminal electron acceptor
    or TEA.

15
Terminal electron acceptor
  • A___________
  • microorganisms utilize some other oxidized
    compound to accept electrons.
  • In the case of denitrifying microorganisms,
    nitrate, NO3-, serves as the TEA, as nitrate is
    converted to nitrogen gas, N2

16
Terminal electron acceptor
  • A___________
  • utilize CO2 and organic compounds as terminal
    electron acceptors.
  • In this process, organic compounds are converted
    to fermentation products and carbon dioxide.
  • In anaerobic digestion of wastewater solids, the
    fermentation products are converted to
  • methane,
  • CH4,
  • and carbon dioxide

17
Terminal Electron Acceptor (TEA)
Examples
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