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Upflow Sludge Blanket Flocculator

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Flocculation- Hydraulic shear forces lead ... [2] Zeta-Meter, Inc. ( 1993) ... to Know About Coagulation and Flocculation, 4th ed., Zeta-Meter, Inc, Virginia. ... – PowerPoint PPT presentation

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Title: Upflow Sludge Blanket Flocculator


1
Up-flow Sludge Blanket Flocculator
  • Jim
  • Wan
  • Flocculating since 2005

2
Coagulation Flocculation
  • Coagulation- Charge neutralization and sweep
    floc
  • Flocculation- Hydraulic shear forces lead to
    collisions between unstable particles

3
Sludge Blanket
  • Acts as a filter to remove turbidity from the
    influent
  • Proportional to the hydraulic residence time of
    the influent
  • An increased height of the sludge blanket will
    increase hydraulic time thus allow more floc to
    get trapped in bigger floc

4
Why?
  • Cheap
  • Remove high levels of turbidity
  • Construction materials readily available

5
Main Goal
  • Developing alternative treatment technologies for
    high turbidity drinking water in regions of the
    world where conventional flocculation,
    sedimentation, filtration processes are not yet
    sustainable

6
Research Objectives
  • Test the ability for a self-forming conical
    system to produce flocculent at a varying up-flow
    velocity
  • Find the optimum height of sludge blanket

7
Methods
  • Varying Flow Rates
  • Varying Sludge Blanket Height
  • See Diagram?

8
Calculations
Clay Calculation
Alum Calculation
9
Experimental Setup
10
Summary of Experiment
11
Results
Effects of Sludge Blanket Height on Final
Turbidity
12
Results
Effects of Sludge Blanket Height on Final
Turbidity
13
Results
Effects of Up-flow Velocity on Final Turbidity
14
Results
Effects of Up-flow Velocity on Final Turbidity
15
Hydraulic Residence Time
16
Results
17
Conclusion
  • Sludge blanket acts as unstable filter
  • Flow rates 300-400 ml/min (Up-flow velocity of
    57-77 m/d) are optimum
  • Sludge blanket height is important
  • Creating flocs without mechanical/hydraulic mixing

18
Future work
  • Different location, different characteristics
  • pH, Alkalinity (coagulant chemistry)
  • Phosphorus alum
  • Density formation of flocs
  • Solid retention time
  • Different influent turbidity

19
References
  • 1 Tchobanoglous, G., Burton, F., and H.
    Stensel. (2003). Wastewater Engineering
    Treatment and Reuse, 4th ed., McGraw Hill, New
    York.
  • 2 Zeta-Meter, Inc. (1993). Everything You Need
    to Know About Coagulation and Flocculation, 4th
    ed., Zeta-Meter, Inc, Virginia.
    http//www.zeta-meter.com/coag.pdf
  • 3 Luu, Kim. (2000). Study of Coagulation and
    Settling Processes for Implementation in Nepal,
    Massachusetts Institute of Technology.
    http//web.mit.edu/watsan/Docs/Student20Theses/Ne
    pal/Luu2000.pdf
  • 4 Rog K. and M. Wilson. (2005). Jar Test for
    Laboratory Research in Environmental Engineering.
    In press.
  • 5 Yukselen, M.A. and J. Gregory. (2002).
    Breakage and Re-formation of alum flocs.
    Environmental Engineering Science. 19 (4), 229.
  • 6 Lee, C.C. and S. Dar Lin (eds.). (2000).
    Handbook of Environmental Engineering
    Calculations, McGraw Hill, New York.

20
Acknowledgement
  • Monroe Weber-Shirk
  • Everyone
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