Pseudo Bond Graph modelling and on-line estimation of unknown kinetics for a wastewater biodegradation process |
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Authors: | Dan Seli?teanu Monica Roman Dorin ?endrescu |
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Affiliation: | 1. Musculoskeletal Quantitative Imaging Research, Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA 94158, USA;2. Department of Orthopaedic Surgery at the University of California, San Francisco, CA, USA;1. Department of Chemical and Biochemical Engineering, Søltofts Plads, Building 229, Technical University of Denmark, DK-2800 Lyngby, Denmark;2. Department of chemical Engineering, 162 Texas A&M Engineering building, Texas A&M University at Qatar, 23874 Doha, Qatar |
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Abstract: | This paper deals with the problem of modelling and on-line estimation of kinetics for a biomethanation process. This bioprocess is in fact a wastewater biodegradation process with production of methane gas, which takes place inside a Continuous Stirred Tank Bioreactor. The reaction scheme and the analysis of biochemical phenomena inside the bioreactor are used in order to obtain a nonlinear dynamic model of the bioprocess, by means of the pseudo Bond Graph method. Two nonlinear estimation strategies are developed for the identification of unknown kinetics of the bioprocess. First, an estimator is developed by using a state observer based technique. Second, an observer based on high-gain approach is designed and implemented. Several numerical simulations are performed in order to analyse and compare the behaviour and the performance of the proposed estimators. |
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