Estimation of hydrogen production in genetically modified E. coli fermentations using an artificial neural network
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Biological hydrogen production is an active research area due to the importance of this gas as an energy carrier and the advantages of using biological systems to produce it. A cheap and practical on-line hydrogen determination is desired in those processes. In this study, an artificial neural network (ANN) was developed to estimate the hydrogen production in fermentative processes. A back propagation neural network (BPNN) of one hidden layer with 12 nodes was selected. The BPNN training was done using the conjugated gradient algorithm and on-line measurements of dissolved CO2, pH and oxidation-reduction potential during the fermentations of cheese whey by Escherichia coli ΔhycA ΔlacI (WDHL) strain with or without pH control. The correlation coefficient between the hydrogen production determined by gas chromatography and the hydrogen production estimated by the BPNN was 0.955. Results showed that the BPNN successfully estimated the hydrogen production using only on-line parameters in genetically modified E. coli fermentations either with or without pH control. This approach could be used for other hydrogen production systems. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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Back propagation neural network; Cheese whey; Dissolved CO2; Hydrogen; pH; Redox potential Artificial Neural Network; Back propagation neural networks; Biological hydrogen production; Cheese whey; Conjugated gradient; Correlation coefficient; Dissolved CO2; E. coli; Energy carriers; Fermentative process; Genetically modified; Hidden layers; Hydrogen determination; Hydrogen production systems; On-line measurement; On-line parameter; Oxidation-reduction potentials; PH control; Redox potentials; Research areas; Backpropagation; Dissolution; Escherichia coli; Fermentation; Gas chromatography; Gas producers; Neural networks; Predictive control systems; Redox reactions; Secondary batteries; Hydrogen production
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