Up-flow Sludge Blanket Flocculator™ Jim Wan Flocculating since 2005 ®

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Presentation transcript:

Up-flow Sludge Blanket Flocculator™ Jim Wan Flocculating since 2005 ®

Coagulation & Flocculation Coagulation- Charge neutralization and “sweep floc” Flocculation- Hydraulic shear forces lead to collisions between unstable particles

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

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

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

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

Methods Varying Flow Rates Varying Sludge Blanket Height See Diagram 

Calculations Alum Calculation Clay Calculation

Experimental Setup

Summary of Experiment DateFlow Rate (ml/min)Sludge Blanket Height Tap WaterClayAlum(cm) 14-Nov Nov Nov Nov Nov Nov Nov Nov Nov Nov Nov Dec Dec Dec

Results Effects of Sludge Blanket Height on Final Turbidity

Results Effects of Sludge Blanket Height on Final Turbidity

Results Effects of Up-flow Velocity on Final Turbidity Flow Rate Up-flow Velocity ml/minm/d

Results Effects of Up-flow Velocity on Final Turbidity

Hydraulic Residence Time Flow rate Up-flow Velocity HRT Sludge height HRT ml/minm/dmincmmin

Results

Conclusion Sludge blanket acts as unstable filter Flow rates ml/min (Up-flow velocity of m/d) are optimum Sludge blanket height is important Creating flocs without mechanical/hydraulic mixing

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

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. [3] Luu, Kim. (2000). Study of Coagulation and Settling Processes for Implementation in Nepal, Massachusetts Institute of Technology. f [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.

Acknowledgement Monroe Weber-Shirk Everyone