Air Binding of Granular Media Filters
Publication: Journal of Environmental Engineering
Volume 130, Issue 10
Abstract
Air bubbles that form in water treatment filters create headloss and can form whenever the total dissolved gas pressure exceeds the local solution pressure. The location of potential bubble formation in filters can be predicted based on measurements of the clean bed headloss with depth, flow rate, and the influent total dissolved gas concentration. Bubble formation within filters can be reduced by increasing the pressure within the filter via greater submergence (water head above the media), lower hydraulic flow rate, or using a more porous media. Bubbles trapped in the bed can be released by “burping,” which can reduce the extent of headloss buildup. Burping is more significant at lower flow rates and within a lower density, higher porosity, hydrophobic anthracite layer.
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References
1.
Appleton, T., Davison, T.S., and Pearce, J. ( 2001). “Rapid gravity filter modeling.” Advances in rapid granular filtration in water treatment, Conf. Proc., The Chartered Institution of Water and Environmental Management, London, 23–32.
2.
HACH Company. (1997). HACH model 2100N laboratory turbidimeter instruction manual.
3.
Harvey, H.H. ( 1975). “Gas disease in fishes—A review.” Proc., Chemistry and Physics of Aqueous Gas Solutions., Electrothermics and Metallurgy and Industrial Electrolytic Divisions, Electrochemical Society, Princeton, N.J., 450–485.
4.
Head, R., and Shepherd, D. ( 2001). “Practical experience of using rapid gravity filter models to improve operational performance at water treatment works.” Advances in rapid granular filtration in water treatment, Con. Proc., The Chartered Institution of Water and Environmental Management, London, 381–390.
11.
, R. D. Letterman, ed. ( 1999). Water quality and treatment: A handbook of community water supplies, 5th Ed., McGraw-Hill, New York.
5.
O’Melia, C. R., and Ali, W. (1978). “The role of retained particles in deep bed filtration.” Prog. Water Technol., 10, 167–187.
6.
Naylor, F., and Millward, A. (1984). “A method of predicting the effect of the dissolved gas content of water on cavitation inception.” Proc. Inst. Mech. Eng., Part C: Mech. Eng. Sci., 198C(12), 163–166.
7.
Ryan, W. L., and Hemmingsen, E. A. (1998). “Bubble formation at porous hydrophobic surfaces.” J. Clim., 197, 101–107.
8.
Scardina, P., and Edwards, M. (2001). “Prediction and measurement of bubble formation in water treatment.” J. Environ. Eng., 127(11), 968–973.
9.
Scardina, P., and Edwards, M. (2002). “Practical implications of bubble formation in conventional treatment.” J. Am. Water Works Assoc., 94(8), 85–85.
10.
Stevenson, D.G. ( 2001). “Exploration of variables in granular media filtration using the filterflex model.” Advances in rapid granular filtration in water treatment, Conf. Proc., The Chartered Institution of Water and Environmental Management, London, 1–10.
12.
Young, F.R. ( 1989). Cavitation, McGraw-Hill, London.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 130 • Issue 10 • October 2004
Pages: 1126 - 1138
Copyright
Copyright © 2004 ASCE.
History
Published online: Oct 1, 2004
Published in print: Oct 2004
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