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Estimation of neutral lipid and carbohydrate quotas in microalgae using adaptive interval observers

Francis Mairet 1 Marcelo Moisan 2 Olivier Bernard 3
3 BIOCORE - Biological control of artificial ecosystems
LOV - Laboratoire d'océanographie de Villefranche, CRISAM - Inria Sophia Antipolis - Méditerranée , INRA - Institut National de la Recherche Agronomique
Abstract : Under stress conditions, microalgae are known to accumulate large amounts of neutral lipids and carbohydrates, which can be used for biofuel production. However, on-line measurement of microalgal biochemical composition is a difficult task which makes the microalgal process rather difficult to manage. In this paper, we propose a so called adaptive interval observer for the on-line estimation of neutral lipid and carbohydrate quotas in microalgae. The observer is based on a change of coordinates that involves a time-varying gain. We introduce dynamics for the gain, whose trajectory converges toward a predefined optimal value (which maximizes the convergence rate of the observer). The observer performance is illustrated with experimental data of Isochrysis sp. cultures under nitrogen limitations and day-night cycle. The proposed observer design appears to be a suitable robust estimation technique.
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Francis Mairet, Marcelo Moisan, Olivier Bernard. Estimation of neutral lipid and carbohydrate quotas in microalgae using adaptive interval observers. Bioprocess and Biosystems Engineering, Springer Verlag, 2014, 37 (1), pp.51-61. ⟨10.1007/s00449-013-0913-7⟩. ⟨hal-00854476⟩

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