Simple Equations to Express Settling Column Data
This article has a reply.
VIEW THE REPLYPublication: Journal of Environmental Engineering
Volume 120, Issue 3
Abstract
Settling column test data are used in the design of settling tanks. The traditional method of analyzing test data graphically is sensitive to inaccuracies in individual data points. Curve fitting can be used instead, in which the entire data set is characterized analytically. If the analytic form adequately represents the trends in the data, errors due to inaccuracies in a few experimental data points are minimized. In this study, two simple equations are developed to express percentage concentration as a function of settling time and depth, and published data are used to test the accuracy of the equations. Removal efficiency equations are obtained by integrating the fitted equations. The removal efficiencies for ideal settling tanks are easily calculated using the method given in this study and are in good agreement with those obtained by graphical methods. The critical time beyond which efficiency does not increase substantially for a given depth is defined, which can be useful in the design of settling tanks.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Berthouex, P. M., and Stevens, D. K. (1982). “Computer analysis of settling data.” J. Envir. Engrg. Div., ASCE, 108(5).
2.
Camp, T. R (1946). “Sedimentation and design of settling tanks.” Trans., ASCE, 111, 895–958.
3.
Eckenfelder, W. W., Jr. (1966). Industrial water pollution control. McGraw‐Hill Book Co., New York, N.Y.
4.
Huisman, L. (1972). Sedimentation and flotation mechanical filtration. Delft University of Technology, Delft, The Netherlands.
5.
Jeans, S. W., and McPherson, M. B. (1964). “Hydrology of urban areas.” Handbook of applied hydrology, V. T. Chow, ed., Section 20, 1–45.
6.
O'Connor, D. J., and Eckenfelder, W. W., Jr. (1961). Biological waste treatment. Pergamon Press, New York, N.Y.
7.
Ryan, T. A., Joiner, B. L., and Ryan, B. F. (1985). Minitab handbook. Duxbury Press, Boston, Mass.
8.
Weber, W. J., Jr. (1972). Physicochemical processes. John Wiley and Sons, Inc., New York, N.Y.
9.
Zanoni, A. E., and Blomquist, M. W. (1975). “Column settling tests for flocculent suspensions.” J. Envir. Engrg. Div., ASCE, 101(3), 309–318.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 120 • Issue 3 • May 1994
Pages: 677 - 682
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Sep 8, 1992
Published online: May 1, 1994
Published in print: May 1994
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.