Wastewater treatment PPT AND PDF

1. SEMINAR PRESENTATION ON:
WASTE WATER TREATMENT
Submitted to: Submitted by:
Mr. S.C. Verma sir Abhishek Ghildiyal
Civil Engg. Dept. Civil Engg.-4th year
COER Section- E
Rollno.- 02

2. Wastewater Treatment: An Introduction
The term waste water treatment refers to
the application various engg techniques to
change their properties(either physical,
chemical or biological) suitable for any
purposes or suitable to be disposed off
without the risk of any kind as per
mentioned in the EPA rules and
regulations.

3. Wastewater Treatment:Purpose
 To manage water discharged from homes, businesses,
and industries to reduce the threat of water pollution.
 To reuse the water discharged form various sources
either for drinking or agricultural purpose.
 To reuse the water for easily recharging the ground
water bodies.
 To safely dispose off the treated water to natural not
causing any harm to living bodies inside or near the
water .

4.  Pre-treatment
 Preliminary treatment
 Primary treatment
 Secondary treatment
 Advanced water treatment
Wastewater Treatment

5. Wastewater Treatment

6. Pre-treatment
 Pre-treatment of waste water is required in
almost at all places except a few .
 Pre-treatment of water means removing
the floating materials from the waste water.
 This treatment includes removing of
floating materials by bars and screening

7. Preliminary Treatment
Preliminary Treatment
- removes large objects and non-
degradable materials
- protects pumps and equipment from
damage
- bar screen and grit chamber

8. Preliminary Treatment
Bar Screen
- catches large
objects that have
gotten into sewer
system such as
bricks, bottles,
pieces of wood, etc.

9. Preliminary Treatment
Grit Chamber
- removes rocks, gravel, broken glass,
etc.
Mesh Screen
- removes diapers, combs, towels,
plastic bags, syringes, etc.

10. Wastewater Treatment
 Preliminary Treatment

11. Primary 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

12. Wastewater Treatment
Primary Treatment

13. Wastewater Treatment
Primary Treatment

14. Sludge from the primary sedimentation
tanks is pumped to the sludge
thickener.
- more settling occurs to concentrate
the sludge prior to disposal
Primary sedimentation tank

15. Primary Treatment:cons
 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.

16.  Secondary Treatment

17. 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.

18. Secondary Treatment
Secondary treatment is performed by :
 Trickling filter
 Rotating Biological contactor
 Oxidation Ponds
Above processes can be performed in different
ways:
 Aerobic decomposition
 An-aerobic decomposition

19. 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.

20. Wastewater Treatment
The final clarifiers
remove additional
sludge and further
reduce
suspended solids
and B.O.D.

21. 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

22. 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

23. 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

24. 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

25. Wastewater Treatment
Governmental Agencies monitor
wastewater treatment plants
U.S. Environmental Protection Agency
Missouri Department of Natural Resources

26. References:
“Environmental engg.”-by Mackanzie L. Davis
“Waste water Treatment”- by S.K. Garg
“waste water Treatment”- by B.C. Punmia‘
www.google.com
www.wikipedia.com
www.waterresouce.org
www.nihw.org