Abstract
The objective of this study was to develop a model-based estimator of biodegradation in unsaturated soil. This would allow real-time assessment of the efficiency of treatment bioprocesses, such as bioventilation and biopile, and eventually permit optimization through the implementation of control strategies. Based on a reduced-order model, an asymptotic observer was designed to estimate on-line the contaminant concentration, using carbon dioxide measurement. Two observer-based estimators were built to approximate: (1) the specific microbial growth rate; and (2) the biocontact kinetics representing the soil resistance to contaminant biodegradation. State observers and parameter estimators were confronted with the experimental results of biodegradation in microcosms. Hexadecane was used as the model compound, representing petroleum hydrocarbons. Three water contents, corresponding to 20%, 50% and 80% of the water-holding capacity, were tested. The asymptotic observer is able to predict hexadecane depletion with an error on the overall time trajectories of 13%, 8% and 4% for the dry, intermediate and wet soils, respectively, which is acceptable given that all the biokinetic parameters were identified from a biodegradation experiment in liquid phase. The observer-based estimator of the specific microbial growth rate, based on the CO2 measurement, was successfully calibrated using the off-line measurements of hexadecane as validation data, and allowed estimation of the time when biodegradation switched from a microbial to a biocontact limitation. The biocontact kinetics was also identified on-line, using an estimator based on the hexadecane not in biocontact. These results are very encouraging with respect to the potential for on-line assessment of the performance of treatment bioprocesses in unsaturated soils.
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Acknowledgements
The authors acknowledge the financial support from the partners of the Industrial Chair in Site Remediation and Management (Alcan, EDF/GDF, Bell Canada, Cambior, Canadian Pacific Railway, Centre Expertise Analyse Environnementale du Québec (CEAEQ), City of Montreal, Total Fina Elf, Hydro-Québec, Natural Science and Engineering Research Council (NSERC), Petro-Canada and Solvay) and from the Belgian Programme on Interuniversity Attraction Poles, initiated by the Belgian State, Prime Minister's Office for Science, Technology and Culture. The scientific responsibility rests with the authors.
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Schoefs, O., Perrier, M., Dochain, D. et al. On-line estimation of biodegradation in an unsaturated soil. Bioprocess Biosyst Eng 26, 37–48 (2003). https://doi.org/10.1007/s00449-003-0336-y
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DOI: https://doi.org/10.1007/s00449-003-0336-y