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Romanus Peter
BEHP1109 1442
Sludge

- organic matter which settles down
in primary and secondary
sedimentation tanks.
Decomposition of organic matter
...


Domestic sewage



Industrial sewage



Water treatment plants


Humus sludge



Activated sludge



Digested sludge


PHYSICAL
includes moisture, density, color, texture,
fluidity and plasticity etc.



CHEMICAL
includes organic matter,...
Main objectives Digestion of organic matter by Common
methods.
 Destruction of pathogenic organisms.
 Safe and aestheti...
•
1.
2.

3.

4.

Thickening or concentration
Reduction of moisture content of raw sludge.
Helps in reducing capacity of di...
•
1.
2.
3.
4.

5.

Digestion or Stabilization
Results in reduction of organic content.
Improved drain ability.
Greatly red...

•

•

Anaerobic digestion—
converts sludge into liquid & gases and also
reduces odor, volume, putrescence & produces
gas...
Temperature of anaerobic digestion
 Mesophilic digestion
 Thermophilic digestion


Dewatering


produces sludge of greater than 10% solid content and
is used after digestion process.
 sludge drying be...


Drying beds are generally used for dewatering
of well digested sludges. Attempts to air dry
raw sludge usually result i...







Partial disposal
Incineration—sludge burnt in incinerator.
Ultimate disposal
disposal by crops land
disposal b...
MISCONCEPTIONS
unimportant additional operation, increase in total cost
of waste water treatment.

IMPORTANCE
represents S...
=
Sludge treatment and disposal
Sludge treatment and disposal
Sludge treatment and disposal
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Sludge treatment and disposal

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  • saprophytic organism - an organism that feeds on dead organic matter especially a fungus or bacterium
  • Transcript of "Sludge treatment and disposal"

    1. 1. Romanus Peter BEHP1109 1442
    2. 2. Sludge - organic matter which settles down in primary and secondary sedimentation tanks. Decomposition of organic matter - foul gas, pollution, health hazards.
    3. 3.  Domestic sewage  Industrial sewage  Water treatment plants
    4. 4.  Humus sludge  Activated sludge  Digested sludge
    5. 5.  PHYSICAL includes moisture, density, color, texture, fluidity and plasticity etc.  CHEMICAL includes organic matter, volatile solids, Nitrogen, phosphate, fats etc.
    6. 6. Main objectives Digestion of organic matter by Common methods.  Destruction of pathogenic organisms.  Safe and aesthetically acceptable disposal of sludge.  By product of methane is used as fuel & and helps in controlling temperature and also generates power.
    7. 7. • 1. 2. 3. 4. Thickening or concentration Reduction of moisture content of raw sludge. Helps in reducing capacity of digestion tank and provides control of digestion condition. It can produce sludge of less than 10% solid content. Units of thickening are gravity thickener, floatation thickener, elutriation thickener.
    8. 8. • 1. 2. 3. 4. 5. Digestion or Stabilization Results in reduction of organic content. Improved drain ability. Greatly reduces odor of the pollutant matter Overall reduction in the volume of the sludge finally to be deposed. Units of digestion are– anaerobic & aerobic
    9. 9.  • • Anaerobic digestion— converts sludge into liquid & gases and also reduces odor, volume, putrescence & produces gases. Bacteria like saprophytic organisms are present that react on complex organic matter and decomposed.
    10. 10. Temperature of anaerobic digestion  Mesophilic digestion  Thermophilic digestion
    11. 11.  Dewatering  produces sludge of greater than 10% solid content and is used after digestion process.  sludge drying beds.  Centrifugation  mechanical methods by vacuum filtration.
    12. 12.  Drying beds are generally used for dewatering of well digested sludges. Attempts to air dry raw sludge usually result in odor problems.  Sludge drying beds consist of perforated or open joint drainage pipe laid within a gravel base.
    13. 13.      Partial disposal Incineration—sludge burnt in incinerator. Ultimate disposal disposal by crops land disposal by oceans
    14. 14. MISCONCEPTIONS unimportant additional operation, increase in total cost of waste water treatment. IMPORTANCE represents SS and BOD loads, impact of biological processes, stabilized sludge considers hygienic and aesthetic requirements, aerobic digestion contains lower BOD value than anaerobic digestion.
    15. 15. =
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