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Specific growth rate observer for the growing phase of a Polyhydroxybutyrate production process

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Abstract
This paper focuses on the specific growth rate estimation problem in a Polyhydroxybutyrate bioplastic production process by industrial fermentation. The kinetics of the process are unknown and there are uncertainties in the model parameters and inputs. During the first hours of the growth phase of the process, biomass concentration can be measured online by an optical density sensor, but as cell density increases this method becomes ineffective and biomass measurement is lost. An asymptotic observer is developed to estimate the growth rate for the case without biomass measurement based on corrections made by a pH control loop. Furthermore, an exponential observer based on the biomass measurement is developed to estimate the growth rate during the first hours, which gives the initial condition to the asymptotic observer. Error bounds and robustness to uncertainties in the models and in the inputs are found. The estimation is independent of the kinetic models of the microorganism. The characteristic features of the observer are illustrated by numerical simulations and validated by experimental results.
Keywords
Observer, PHB, Estimation, Bioplastics, Software sensor, POLY-BETA-HYDROXYBUTYRATE, MIXED CULTURE, KINETICS, BIOREACTORS, POLYHYDROXYALKANOATES, STATE, PHB

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MLA
Jamilis, Martín et al. “Specific Growth Rate Observer for the Growing Phase of a Polyhydroxybutyrate Production Process.” Ed. Dirk Weuster-Botz. BIOPROCESS AND BIOSYSTEMS ENGINEERING 38.3 (2015): 557–567. Print.
APA
Jamilis, M., Garelli, F., Mozumder, M. S. I., Volcke, E., & De Battista, H. (2015). Specific growth rate observer for the growing phase of a Polyhydroxybutyrate production process. (D. Weuster-Botz, Ed.)BIOPROCESS AND BIOSYSTEMS ENGINEERING, 38(3), 557–567.
Chicago author-date
Jamilis, Martín, Fabricio Garelli, Md. Salatul Islam Mozumder, Eveline Volcke, and Hernán De Battista. 2015. “Specific Growth Rate Observer for the Growing Phase of a Polyhydroxybutyrate Production Process.” Ed. Dirk Weuster-Botz. Bioprocess and Biosystems Engineering 38 (3): 557–567.
Chicago author-date (all authors)
Jamilis, Martín, Fabricio Garelli, Md. Salatul Islam Mozumder, Eveline Volcke, and Hernán De Battista. 2015. “Specific Growth Rate Observer for the Growing Phase of a Polyhydroxybutyrate Production Process.” Ed. Dirk Weuster-Botz. Bioprocess and Biosystems Engineering 38 (3): 557–567.
Vancouver
1.
Jamilis M, Garelli F, Mozumder MSI, Volcke E, De Battista H. Specific growth rate observer for the growing phase of a Polyhydroxybutyrate production process. Weuster-Botz D, editor. BIOPROCESS AND BIOSYSTEMS ENGINEERING. 2015;38(3):557–67.
IEEE
[1]
M. Jamilis, F. Garelli, M. S. I. Mozumder, E. Volcke, and H. De Battista, “Specific growth rate observer for the growing phase of a Polyhydroxybutyrate production process,” BIOPROCESS AND BIOSYSTEMS ENGINEERING, vol. 38, no. 3, pp. 557–567, 2015.
@article{5888663,
  abstract     = {This paper focuses on the specific growth rate estimation problem in a Polyhydroxybutyrate bioplastic production process by industrial fermentation. The kinetics of the process are unknown and there are uncertainties in the model parameters and inputs. During the first hours of the growth phase of the process, biomass concentration can be measured online by an optical density sensor, but as cell density increases this method becomes ineffective and biomass measurement is lost. An asymptotic observer is developed to estimate the growth rate for the case without biomass measurement based on corrections made by a pH control loop. Furthermore, an exponential observer based on the biomass measurement is developed to estimate the growth rate during the first hours, which gives the initial condition to the asymptotic observer. Error bounds and robustness to uncertainties in the models and in the inputs are found. The estimation is independent of the kinetic models of the microorganism. The characteristic features of the observer are illustrated by numerical simulations and validated by experimental results.},
  author       = {Jamilis, Martín and Garelli, Fabricio and Mozumder, Md. Salatul Islam and Volcke, Eveline and De Battista, Hernán},
  editor       = {Weuster-Botz, Dirk},
  issn         = {1615-7591},
  journal      = {BIOPROCESS AND BIOSYSTEMS ENGINEERING},
  keywords     = {Observer,PHB,Estimation,Bioplastics,Software sensor,POLY-BETA-HYDROXYBUTYRATE,MIXED CULTURE,KINETICS,BIOREACTORS,POLYHYDROXYALKANOATES,STATE,PHB},
  language     = {eng},
  number       = {3},
  pages        = {557--567},
  title        = {Specific growth rate observer for the growing phase of a Polyhydroxybutyrate production process},
  url          = {http://dx.doi.org/10.1007/s00449-014-1295-1},
  volume       = {38},
  year         = {2015},
}

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