Abstract
Respirometry consists in the measurement of the biological oxygen consumption rate under well-defined conditions and has been used for the characterization of countless biological processes. In the field of biotechnology and applied microbiology, several respirometry methods are commonly used for the determination of process parameters. Dynamic and static respirometry, which are based on oxygen measurements with or without continuous aeration, respectively, are the methods most commonly used. Additionally to several respirometry methods, different methods have also been developed to retrieve process parameters from respirometric data. Among them, methods based on model fitting and methods based on the injection of substrate pulse at increasing concentration are commonly used. An important question is then; what respirometry and data interpretation methods should be preferably used? So far, and despite a growing interest for respirometry, relatively little attention has been paid on the comparison between the different methods available. In this work, both static and dynamic respirometry methods and both interpretation methods; model fitting and pulses of increasing concentration, were compared to characterize an autotrophic nitrification process. A total of 60 respirometry experiments were done and exhaustively analysed, including sensitivity and error analyses. According to the results obtained, the substrate affinity constant (K S ) was better determined by static respirometry with pulses of increasing concentration and the maximum oxygen uptake rate (OUR ex.max ) was better determined by dynamic respirometry coupled to fitting procedure. The best method for combined K S and OUR ex.max determination was static respirometry with pulses of increasing concentration.
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Acknowledgments
This work was supported by “Consejo Nacional de Ciencia y Tecnología” (Project 59872). We also gratefully acknowledge the “Consejo Nacional de Ciencia y Tecnología” for the financial support to Rocío Ramírez-Vargas and I.Y. Hernández-Paniagua (Grant # 219393 and # 209848, respectively) and to Alberto Ordaz (Postdoc Grant # 290586_IPN). The authors are thankful to Victoria T. Velázquez-Martínez and Joel Alba-Flores for their technical assistance.
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Ramirez-Vargas, R., Ordaz, A., Carrión, M. et al. Comparison of static and dynamic respirometry for the determination of stoichiometric and kinetic parameters of a nitrifying process. Biodegradation 24, 675–684 (2013). https://doi.org/10.1007/s10532-012-9615-0
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DOI: https://doi.org/10.1007/s10532-012-9615-0