Wastewater
Treatment
Wastewater Treatment
Purpose:
To manage water discharged from
homes, businesses, and industries
to reduce the threat of w...
 Pre-treatment
 Preliminary treatment
 Primary treatment
 Secondary treatment
 Sludge (biosolids) disposal
Wastewater...
Wastewater Treatment
 Pre-treatment
- Occurs in business or industry
prior to discharge
- Prevention of toxic chemicals o...
Wastewater Treatment
Water discharged from homes, businesses,
and industry enters sanitary sewers
Water from rainwater o...
Wastewater Treatment
Water moves toward the
wastewater plant primarily by
gravity flow
Lift stations pump water from low...
Wastewater Treatment
Wastewater Treatment
Preliminary Treatment
- removes large objects and non-
degradable materials
- protects pumps and equ...
Wastewater Treatment
Bar Screen
- catches large
objects that have
gotten into sewer
system such as
bricks, bottles,
piece...
Wastewater Treatment
Grit Chamber
- removes rocks, gravel, broken glass,
etc.
Mesh Screen
- removes diapers, combs, towe...
Wastewater Treatment
 Preliminary Treatment
Wastewater Treatment
Measurement and sampling at the inlet
structure
- a flow meter continuously records the
volume of wa...
Wastewater Treatment
Suspended Solids – the quantity of solid
materials floating in the water column
B.O.D. = Biochemica...
Wastewater Treatment
Measurements of Suspended Solids and
B.O.D. indicate the effectiveness of
treatment processes
Both ...
Wastewater Treatment
Primary Treatment
-- a physical process
-- wastewater flow is slowed down and
suspended solids settl...
Wastewater Treatment
Primary Treatment
Wastewater Treatment
Primary Treatment
Wastewater Treatment
Primary Treatment
Sludge from the primary sedimentation
tanks is pumped to the sludge
thickener.
- more settling occurs to concentrate
the ...
Wastewater Treatment
Primary treatment reduces the suspended solids
and the B.O.D. of the wastewater.
From the primary t...
Wastewater Treatment
Secondary Treatment
Wastewater Treatment
Secondary Treatment
Secondary treatment is a biological process
Utilizes bacteria and algae to met...
Wastewater Treatment
Secondary Treatment
 the trickling filter does not “filter” the
water
 water runs over a plastic m...
Wastewater Treatment
From secondary treatment on the trickling filter
water flows to the final clarifiers for further
rem...
Wastewater Treatment
The final clarifiers
remove additional
sludge and further
reduce
suspended solids
and B.O.D.
Wastewater Treatment
Disposal of Sludge or Biosolids
-- the sludge undergoes lime
stabilization (pH is raised by addition...
Wastewater Treatment
Disposal of Sludge or Biosolids
-- in the past, Cape Girardeau disposed of
the sludge by landfill or...
Wastewater Treatment
The final part of the field trip tour
will be in the treatment plant lab.
Wastewater Treatment
The wastewater plant lab conducts a
number of measurements and tests
on the water.
suspended solids ...
Wastewater Treatment
In addition to test performed at the
wastewater lab, an off-site contract
lab performs additional te...
Wastewater Treatment
Governmental Agencies monitor
wastewater treatment plants
U.S. Environmental Protection Agency
Misso...
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Wastewater treatment bs 105 sp2013

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Wastewater treatment bs 105 sp2013

  1. 1. Wastewater Treatment
  2. 2. Wastewater Treatment Purpose: To manage water discharged from homes, businesses, and industries to reduce the threat of water pollution.
  3. 3.  Pre-treatment  Preliminary treatment  Primary treatment  Secondary treatment  Sludge (biosolids) disposal Wastewater Treatment
  4. 4. Wastewater Treatment  Pre-treatment - Occurs in business or industry prior to discharge - Prevention of toxic chemicals or excess nutrients being discharged in wastewater
  5. 5. Wastewater Treatment Water discharged from homes, businesses, and industry enters sanitary sewers Water from rainwater on streets enters storm water sewers Combined sewers carry both sanitary wastes and storm water
  6. 6. Wastewater Treatment Water moves toward the wastewater plant primarily by gravity flow Lift stations pump water from low lying areas over hills
  7. 7. Wastewater Treatment
  8. 8. Wastewater Treatment Preliminary Treatment - removes large objects and non- degradable materials - protects pumps and equipment from damage - bar screen and grit chamber
  9. 9. Wastewater Treatment Bar Screen - catches large objects that have gotten into sewer system such as bricks, bottles, pieces of wood, etc.
  10. 10. Wastewater Treatment Grit Chamber - removes rocks, gravel, broken glass, etc. Mesh Screen - removes diapers, combs, towels, plastic bags, syringes, etc.
  11. 11. Wastewater Treatment  Preliminary Treatment
  12. 12. Wastewater Treatment Measurement and sampling at the inlet structure - a flow meter continuously records the volume of water entering the treatment plant - water samples are taken for determination of suspended solids and B.O.D.
  13. 13. Wastewater Treatment Suspended Solids – the quantity of solid materials floating in the water column B.O.D. = Biochemical Oxygen Demand - a measure of the amount of oxygen required to aerobically decompose organic matter in the water
  14. 14. Wastewater Treatment Measurements of Suspended Solids and B.O.D. indicate the effectiveness of treatment processes Both Suspended Solids and B.O.D. decrease as water moves through the wastewater treatment processes
  15. 15. Wastewater Treatment Primary Treatment -- a physical process -- wastewater flow is slowed down and suspended solids settle to the bottom by gravity -- the material that settles is called sludge or biosolids
  16. 16. Wastewater Treatment Primary Treatment
  17. 17. Wastewater Treatment Primary Treatment
  18. 18. Wastewater Treatment Primary Treatment
  19. 19. Sludge from the primary sedimentation tanks is pumped to the sludge thickener. - more settling occurs to concentrate the sludge prior to disposal Wastewater Treatment
  20. 20. Wastewater Treatment Primary treatment reduces the suspended solids and the B.O.D. of the wastewater. From the primary treatment tanks water is pumped to the trickling filter for secondary treatment. Secondary treatment will further reduce the suspended solids and B.O.D. of the wastewater.
  21. 21. Wastewater Treatment Secondary Treatment
  22. 22. Wastewater Treatment Secondary Treatment Secondary treatment is a biological process Utilizes bacteria and algae to metabolize organic matter in the wastewater In Cape Girardeau secondary treatment occurs on the trickling filter
  23. 23. Wastewater Treatment Secondary Treatment  the trickling filter does not “filter” the water  water runs over a plastic media and organisms clinging to the media remove organic matter from the water
  24. 24. Wastewater Treatment From secondary treatment on the trickling filter water flows to the final clarifiers for further removal of sludge. The final clarifiers are another set of primary sedimentation tanks. From the final clarifiers the water is discharged back to the Mississippi River.
  25. 25. Wastewater Treatment The final clarifiers remove additional sludge and further reduce suspended solids and B.O.D.
  26. 26. Wastewater Treatment Disposal of Sludge or Biosolids -- the sludge undergoes lime stabilization (pH is raised by addition of lime) to kill potential pathogens -- the stabilized sludge is land applied by injection into agricultural fields
  27. 27. Wastewater Treatment Disposal of Sludge or Biosolids -- in the past, Cape Girardeau disposed of the sludge by landfill or incineration -- landfill disposal discontinued to the threat of leachate -- incineration discontinued because of the ineffectiveness and cost
  28. 28. Wastewater Treatment The final part of the field trip tour will be in the treatment plant lab.
  29. 29. Wastewater Treatment The wastewater plant lab conducts a number of measurements and tests on the water. suspended solids temperature B.O.D. nitrogen pH phosphorus
  30. 30. Wastewater Treatment In addition to test performed at the wastewater lab, an off-site contract lab performs additional tests heavy metals priority pollutants W.E.T (Whole Effluent Toxicity) tests
  31. 31. Wastewater Treatment Governmental Agencies monitor wastewater treatment plants U.S. Environmental Protection Agency Missouri Department of Natural Resources
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