Model of Bacterial-Supplement Kinetics
Publication: Journal of Environmental Engineering
Volume 123, Issue 8
Abstract
A steady-state model for a suspended-growth reactor charged with bacterial supplements is developed. This model, following Monod kinetics and mass conservative principles, considers bacterial supplements (Xo) as a process parameter while maintaining the conventional one of solids retention time (θc), which can be used for design and analysis of charged reactors. Model solutions are easily obtained by direct computation, provided that four of the six parameters So, Xo, θc, θ, S, and X are put into predicting equations. The great merit of this model is that it predicts two extreme operations exist—θc lower than θmin and S below Smin—when the reactor is properly controlled by Xo and θc. Relative importance of Xo to θc in process control is clarified: at higher So process performance is dominated by the control of θc alone; but when So is decreasing, the θc gradually loses its dominance and the Xo increasingly acquires its importance. Illustrative examples are provided to demonstrate the usefulness of this model.
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References
1.
Daigger, G. T., Norton, L. E., Watson, R. S., Crawford, D., and Sieger, R. B.(1993). “Process and kinetic analysis of nitrification in coupled trickling filter/activated sludge processes.”Water Envir. Res., 65(6), 750–758.
2.
Garrett, M. T. Jr.(1958). “Hydraulic control of activated sludge growth rate.”Sewage and Industrial Wastes, 30(3), 253–261.
3.
Gaudy, A. F. Jr., Srinivasaraghavan, R., and Saleh, M.(1977). “Conceptual model for activated sludge processes.”J. Envir. Engrg., ASCE, 103(1), 71–85.
4.
Harrison, J. R., Daigger, G. T., and Filbert, J. W.(1984). “A survey of combined trickling filter and activated sludge processes.”J. Water Pollution Control Fed., 56(10), 1073–1079.
5.
Lawrence, A. W., and McCarty, P. L.(1970). “Unified basis for biological treatment design and operation.”J. Sanitary Engrg. Div., ASCE, 96(3), 757–779.
6.
Lee, C. Y.(1992). “Model for biological reactors having suspended and attached growths.”J. Envir. Engrg., ASCE, 118(6), 982–987.
7.
Lee, C. Y.(1997). “Discussion of `How input active biomass affects sludge age and process stability' by B. E. Rittmann.”J. Envir. Engrg., ASCE, 123(1), 101–103.
8.
Matasci, R. N., Kaempfer, C., and Heidman, J. A.(1986). “Full-scale studies of the trickling filter/solids contact process.”J. Water Pollution Control Fed., 58(11), 1043–1049.
9.
Newbry, B. W., Daigger, G. T., and Taniguchi-Denis, D.(1988). “Unit process tradeoffs for combined trickling filter and activated sludge processes.”J. Water Pollution Control Fed., 60(10), 1813–1821.
10.
Rittmann, B. E.(1996). “How input active biomass affects sludge age and process stability.”J. Envir. Engrg., ASCE, 122(1), 4–8.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 123 • Issue 8 • August 1997
Pages: 809 - 812
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Aug 1, 1997
Published in print: Aug 1997
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