Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/91122
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Type: Journal article
Title: Effect of pH control strategies and substrate concentration on the hydrogen yield from fermentative hydrogen production in large laboratory-scale
Author: Mariakakis, I.
Krampe, J.
Steinmetz, H.
Citation: Water Science and Technology, 2012; 65(2):262-269
Publisher: IWA Publishing
Issue Date: 2012
ISSN: 0273-1223
1996-9732
Statement of
Responsibility: 
I. Mariakakis, J. Krampe and H. Steinmetz
Abstract: A series of batch experiments investigating two different pH control strategies, initial pH adjustment and continuous pH control, have been carried out in large laboratory-scale reactors with working volumes of 30 L. In both cases, pH was varied between 5 and 7.5. Sucrose concentrations were also varied starting from 0 up to 30 g/L. Higher hydrogen production yields can be achieved by batch experiments through continuous pH control than by simple initial pH adjustment. In the case of continuous pH control, maximization of hydrogen yield was acquired for slightly acidic pH of 6.5. Continuous pH control in the neutral pH range of 7.0 and in pH lower than 6.5, induced a reduction in the hydrogen production yield. Sucrose can be completely degraded only for a pH higher than 6. Lower pH values seem to inhibit the hydrogen-producing bacteria. Under the conditions of continuous pH adjustment at pH 6.5 and a sucrose concentration of 25 g/L the maximum hydrogen yield of 1.79 mol H(2)/mol hexose was obtained. These conditions could be applied for the batch start-up of large fermentors.
Keywords: bio-hydrogen; dark fermentation; large lab-scale; pH control; sucrose concentration
Rights: © IWA Publishing 2012
RMID: 0030027766
DOI: 10.2166/wst.2012.777
Appears in Collections:Civil and Environmental Engineering publications

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