Surface Water Pretreatment Using Floating Media Filter
Publication: Journal of Environmental Engineering
Volume 122, Issue 1
Abstract
Laboratory-scale experiments were conducted in contact flocculation filtration using a dual media filter operating in the upflow, saturated mode. The filter media was lighter than water; thus, the bed floated. Since coarse media remained at the bottom, the flow direction was upflow, which had the added advantage of the flow being in the direction of grain compression. Polypropylene and Polystyrene were the optimum combination of media, which due to their large density difference did not intermix even under severe agitation, thus eliminating the media intermixing problem common to dual media filters. The influent concentrations were kept constant and the flow velocity, and filter media size and shape were varied. The headloss variation along the filter, the influent quality of two filter layers, and the effluent quality were studied. Filter runs exceeding 40 h were achieved before reaching breakthrough at conventional rapid sand filtration rates. Floating media obtained turbidity removal per unit headloss in comparison to sand media, and floating media are proposed as a prefilter in surface-water filtration.
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References
1.
Adin, A., and Rebhun, M.(1974). “High rate contact flocculation filtration with cationic polyelectrolyte.”J. AWWA, 66(2), 109–117.
2.
Clark, S. C., Lawler, D. F., and Cushing, R. S.(1992). “Contact filtration, particle size and ripening.”J. AWWA, 84(12), 61–71.
3.
Daniel, E. R., and Garton, J. E.(1969). “An automated upflow filter for domestic water supplies.”Trans. ASAE, 12(4), 556–558.
4.
Diaper, E. W. J., and Ives, K. J. (1965). “Filtration through size graded media.”J. Sanit. Engrg. Div., ASCE, 91(S3), 89–114.
5.
Haberer, K. (1972). “Filtration flocculation processes for coagulation filters.”Vom Wasser, Vol. 39, 147 (in German).
6.
Haberer, K., and Schmidt, S. N.(1991). “The Haberer process: combining contact flocculation, filtration & PAC adsorption.”J. AWWA, 83(9), 82–89.
7.
Hamann, C. L., and McKinny, R. E.(1968). “Upflow filtration process.”J. AWWA, 60(9), 1023–1039.
8.
Haney, B. J., and Steimle, S. E. (1974). “Potable water supply by means of upflow filtration (L'Eau Claire process).”J. AWWA, 66(2), 117–123.
9.
Hutchison, W. R. (1975). “Operational variables and limitations of direct filtration.”Res. Rep. No. W54, Ministry of the Environment, Toronto, Ont., Canada.
10.
Quaye, B. A. (1991). “Contact filtration of surface water,”Water Supply, 9(1), S 59–S 63.
11.
Rice, C. E., Magnuson, M. L., and Garton, J. E.(1980). “Upflow water filtration unit, test results.”Trans. ASAE, 23(5), 1143–1146.
12.
Rogalla, F., Badard, M., Hansen, F., and Dansholm, P. (1992). “Upscaling a compact nitrogen removal process,”Proc., Water Quality Int.
13.
Shea, T. G., Gates, W. E., and Argaman, Y. A.(1971). “Experimental evaluation of operating variables in contact flocculation filtration.”J. AWWA, 63(1), 41–48.
14.
Stuckenberg, J. R., and Hesby, J. C.(1991). “Pilot testing the Haberer process in the United States.”J. AWWA, 83(9), 90–96.
15.
Werellagama, D. R. I. B. (1993). “Application of the floto filter unit for contact flocculation filtration of surface waters.” ME thesis, Asian Inst. of Technol., Bangkok, Thailand.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 122 • Issue 1 • January 1996
Pages: 25 - 33
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Jan 1, 1996
Published in print: Jan 1996
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