Dynamic simulation of pH in anaerobic processes
- 149 Downloads
With the objective of contributing to the buildup of mathematical tools for anaerobic process simulation, an algorithm for the dynamic simulation of pH was developed. The dynamic simulation of the gaseous phase variables was also considered. The pH algorithm was validated for a watery system, obtaining good agreement between predicted and experimental data. The applied methodology provides a differential equation that allows the inclusion of pH as a state variable of the system that can be easily included in a general mathematical model of anaerobic digestion using matrix notation. This methodology also allows a noticeable decrease in computing time in simulations. A dynamic anaerobic digestion model of complex substrates taken from the literature was completed with the developed algorithms, and it was used to predict the response of an anaerobic reactor against overloading and against the presence of pH-dependent inhibitors with satisfactory results.
Index EntriesAnaerobic digestion model pH simulation ammonia inhibition physical-chemical processes dynamical modeling
Unable to display preview. Download preview PDF.
- 2.Batstone, D. J., Keller, J., Angelidaki, R. I., Kalyuzhny, S. V., Pavlostathis, S. G., Rozzi, A., Sanders, W. T. M., Siegrist, H., and Vavilin, V.-A. (2002), Scientific and Technical Report No. 13, International Water Association, London.Google Scholar
- 3.Clark, R. H. and Speece, R. E. (1970), in Advances in Water Pollution Research, Proceedings of the 5th International Conference, vol. II(27), Jenkins, S. H., ed., Pergamon, Oxford, pp. 1–14.Google Scholar
- 8.Ahring, B. K. and Westermann, P. (1988), Appl. Environ. Microbiol. 54, 2393–2397.Google Scholar
- 9.Fukuzaki, S., Nishio, N., Shobayashi, M., and Nagai, S. (1990), Appl. Environ. Microbiol. 56, 719–723.Google Scholar
- 10.Andrews, J. F. and Graef, S. P. (1971), in Anaerobic Biological Treatment Processes, Advances in Chemistry Series 105, Pohland, F. G., ed., American Chemical Society, Washington, DC, pp. 126–162.Google Scholar
- 12.Siegrist, H., Renggli., D., and Gujer, W. (1993), Water Sci. Technol. 27(2), 25–36.Google Scholar
- 16.Lide, D. (1993), CRC Handbook of Chemistry and Physics, 73rd ed., CRC Press, Boca Raton, FL.Google Scholar
- 17.Aguilar Sanjuán, M. (1993), Introduccion a los equilibrios iónicos, Cpda-etseib, Barcelona.Google Scholar
- 22.Sewell, G. (1988), The Numerical Solution of Ordinary and Partial Differential Equations, Academic, London.Google Scholar
- 27.Campos, E. (2001), PhD thesis, University of Lleida, Lleida, Spain.Google Scholar