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An optimizing start-up strategy for a bio-methanator

Mihaela Sbarciog, Mia Loccufier UGent and Alain Vande Wauwer (2012) BIOPROCESS AND BIOSYSTEMS ENGINEERING. 35(4). p.565-578
abstract
This paper presents an optimizing start-up strategy for a bio-methanator. The goal of the control strategy is to maximize the outflow rate of methane in anaerobic digestion processes, which can be described by a two-population model. The methodology relies on a thorough analysis of the system dynamics and involves the solution of two optimization problems: steady-state optimization for determining the optimal operating point and transient optimization. The latter is a classical optimal control problem, which can be solved using the maximum principle of Pontryagin. The proposed control law is of the bang–bang type. The process is driven from an initial state to a small neighborhood of the optimal steady state by switching the manipulated variable (dilution rate) from the minimum to the maximum value at a certain time instant. Then the dilution rate is set to the optimal value and the system settles down in the optimal steady state. This control law ensures the convergence of the system to the optimal steady state and substantially increases its stability region. The region of attraction of the steady state corresponding to maximum production of methane is considerably enlarged. In some cases, which are related to the possibility of selecting the minimum dilution rate below a certain level, the stability region of the optimal steady state equals the interior of the state space. Aside its efficiency, which is evaluated not only in terms of biogas production but also from the perspective of treatment of the organic load, the strategy is also characterized by simplicity, being thus appropriate for implementation in reallife systems. Another important advantage is its generality: this technique may be applied to any anaerobic digestion process, for which the acidogenesis and methanogenesis are, respectively, characterized by Monod and Haldane kinetics.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
REACTORS, EFFICIENT, KINETICS, SYSTEMS, Biotechnology, Nonlinear systems, Stability analysis, Optimal control, Bang-bang control, STABILITY, WATER TREATMENT PROCESS, MODEL, ANAEROBIC-DIGESTION PROCESS
journal title
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Bioprocess. Biosyst. Eng.
volume
35
issue
4
pages
565 - 578
Web of Science type
Article
Web of Science id
000303053900009
JCR category
ENGINEERING, CHEMICAL
JCR impact factor
1.869 (2012)
JCR rank
38/132 (2012)
JCR quartile
2 (2012)
ISSN
1615-7591
DOI
10.1007/s00449-011-0629-5
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2053358
handle
http://hdl.handle.net/1854/LU-2053358
date created
2012-02-29 22:43:19
date last changed
2012-10-29 10:44:45
@article{2053358,
  abstract     = {This paper presents an optimizing start-up strategy for a bio-methanator. The goal of the control strategy is to maximize the outflow rate of methane in anaerobic digestion processes, which can be described by a two-population model. The methodology relies on a thorough analysis of the system dynamics and involves the solution of two optimization problems: steady-state optimization for determining the optimal operating point and transient optimization. The latter is a classical optimal control problem, which can be solved using the maximum principle of Pontryagin. The proposed control law is of the bang--bang type. The process is driven from an initial state to a small neighborhood of the optimal steady state by switching the manipulated variable (dilution rate) from the minimum to the maximum value at a certain time instant. Then the dilution rate is set to the optimal value and the system settles down in the optimal steady state. This control law ensures the convergence of the system to the optimal steady state and substantially increases its stability region. The region of attraction of the steady state corresponding to maximum production of methane is considerably enlarged. In some cases, which are related to the possibility of selecting the minimum dilution rate below a certain level, the stability region of the optimal steady state equals the interior of the state space. Aside its efficiency, which is evaluated not only in terms of biogas production but also from the perspective of treatment of the organic load, the strategy is also characterized by simplicity, being thus appropriate for implementation in reallife systems. Another important advantage is its generality: this technique may be applied to any anaerobic digestion process, for which the acidogenesis and methanogenesis are, respectively, characterized by Monod and Haldane kinetics.},
  author       = {Sbarciog, Mihaela  and Loccufier, Mia and Vande Wauwer, Alain},
  issn         = {1615-7591},
  journal      = {BIOPROCESS AND BIOSYSTEMS ENGINEERING},
  keyword      = {REACTORS,EFFICIENT,KINETICS,SYSTEMS,Biotechnology,Nonlinear systems,Stability analysis,Optimal control,Bang-bang control,STABILITY,WATER TREATMENT PROCESS,MODEL,ANAEROBIC-DIGESTION PROCESS},
  language     = {eng},
  number       = {4},
  pages        = {565--578},
  title        = {An optimizing start-up strategy for a bio-methanator},
  url          = {http://dx.doi.org/10.1007/s00449-011-0629-5},
  volume       = {35},
  year         = {2012},
}

Chicago
Sbarciog, Mihaela , Mia Loccufier, and Alain Vande Wauwer. 2012. “An Optimizing Start-up Strategy for a Bio-methanator.” Bioprocess and Biosystems Engineering 35 (4): 565–578.
APA
Sbarciog, M., Loccufier, M., & Vande Wauwer, A. (2012). An optimizing start-up strategy for a bio-methanator. BIOPROCESS AND BIOSYSTEMS ENGINEERING, 35(4), 565–578.
Vancouver
1.
Sbarciog M, Loccufier M, Vande Wauwer A. An optimizing start-up strategy for a bio-methanator. BIOPROCESS AND BIOSYSTEMS ENGINEERING. 2012;35(4):565–78.
MLA
Sbarciog, Mihaela , Mia Loccufier, and Alain Vande Wauwer. “An Optimizing Start-up Strategy for a Bio-methanator.” BIOPROCESS AND BIOSYSTEMS ENGINEERING 35.4 (2012): 565–578. Print.