Simplified Equations for Effectiveness Factors in Anaerobic Biofilms
Publication: Journal of Environmental Engineering
Volume 115, Issue 6
Abstract
The diffusion effects occuring in a biofilm in which a consecutive bioreaction takes place are studied theoretically, and effectiveness factors which evaluate the effect of the diffusion rates on substrate decomposition rates, are represented by a simple algebraic relation expressed in terms of normalized substrate bulk concentrations (B) and normalized characteristic biofilm parameters. On the other hand, the overall decomposition rates of the substrates can be expressed by a Monod‐type equation for the substrate bulk concentration. The apparent half velocity constants in the Monod‐type rate equation are affected by the diffusion and biochemical reaction rates of the substrates. The ratio of the apparent half velocity constants to the corresponding specific half velocity constants (λ) is related to The relationship is expressed in the following equation: The applicability of these theoretical relations is experimentally demonstrated in volatile fatty acids decomposition. This equation may be rationally used for the design and/or performance of biofilm reactors.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Atkinson, B., and Davies, I. J. (1974). “The overall rate of substrate uptake reaction by microbial films.” Trans. Instn. Chem. Engrs., 52, 248–259.
2.
Kuroda, M., Yuzawa, M., and Sakakibara, Y. (1986). “A kinetic model of sewage digestion.” Anaerobic Treatment a Grown‐up Technology, EWPCA Water Treatment Conf., Amsterdam, The Netherlands, 79–87.
3.
Lawrence, A. W., and McCarty, P. L. (1969). “Kinetics of methane fermentation in anaerobic treatment.” JWPCF, 41(2), R1–R17.
4.
Mosey, F. E. (1983). “Mathematical modelling of the anaerobic digestion process: Regulatory mechanisms for the formation of short‐chain volatile fatty acids.” Wat. Sci. Tech. 15, Copenhagen, Denmark, 209–232.
5.
Rittmann, B. E., and McCarty, P. L. (1980). “Model of steady‐state biofilm kinetics.” Biotech. Bioengrg., 22(4), S2343–2357.
6.
Rittmann, B. E., and McCarty, P. L. (1981). “Substrate fluxes into biofilms of any thickness.” J. Envir. Engrg., ASCE, 107(4), 831–848.
7.
Sakakibara, Y., Yuzawa, M., and Kuroda, M. (1985). “Theoretical consideration on the performance of a biofilm reactor in which a consecutive reaction takes place.” Proc. Envir. and Sanitary Engrg. Res., 21, 133–142.
8.
Sakakibara, Y., Yuzawa, M., and Kuroda, M. (1986). “Analysis of acetate removal rates in mefhanogen attached biofilm reactors.” Proc. JSCE, 375(II–6), 311–318.
9.
Sakakibara, Y., Yuzawa, M., and Kuroda, M. (1987). “Theoretical consideration on the treatment characteristics of volatile fatty acids in completely mixed anaerobic biofilm reactors.” Proc. JSCE, 387(II–8), 291–299.
10.
Williamson, K., and McCarty, P. L. (1976). “A model of substrate utilization by bacterial films.” JWPCF, 48(1), 9–24.
Information & Authors
Information
Published In
Copyright
Copyright © 1989 ASCE.
History
Published online: Dec 1, 1989
Published in print: Dec 1989
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.