Photofermentative hydrogen production from volatile fatty acids present in dark fermentation effluents

Date

2009-05-01

Author

Uyar, Basar
Eroglu, Inci
Yucel, Meral
Gündüz, Ufuk

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

157
views

0
downloads

In the present study, the growth and hydrogen production of Rhodobacter sphaeroides O.U. 001, was investigated in media containing five different volatile fatty acids (VIA) individually (malate, acetate, propionate, butyrate and lactate) and in media containing mixtures of these acids that reflect the composition of dark fermentation effluents. The highest hydrogen production rate was obtained in malate (24 ml(hydrogen)/I(reactor)h) and the highest biomass concentration was obtained in acetate containing media (1.65 g/l). The substrate conversion efficiencies for different volatile fatty acids were found to vary between 14 and 50%. The malate and butyrate consumption rates were first order with consumption rate constants of 0.026 h(-1) and 0.015 h(-1), respectively. In the case of substrate mixtures, it was observed that the bacteria consumed acetate first, followed by propionate and then butyrate. It was also found that the consumption rate of the main substrate significantly increased when the minor substrates were depleted. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

Subject Keywords

Rhodobacter sphaeroides, Photofermentation, Dark fermentation, Volatile fatty acid, Substrate conversion efficiency

URI

https://hdl.handle.net/11511/30038

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

DOI

https://doi.org/10.1016/j.ijhydene.2008.07.057

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Photoproduction of hydrogen by Rhodobacter capsulatus from thermophilic fermentation effluent Uyar, Basar; Schumacher, Matthias; Gebicki, Jakub; Modigell, Michael (2009-08-01) Rhodobacter capsulatus was used for the phototrophic hydrogen production on effluent solution derived from the thermophilic fermentation of Miscanthus hydrolysate by Thermotoga neapolitana. Pretreatments such as centrifugation, dilution, buffer addition, pH adjustment and sterilization were suggested for the effluent before being fed to the photofermentation. Batch-wise experiments showed that R. capsulatus grows and produces hydrogen on the pretreated effluent solution. Moreover, it was found that the hydr...
Estimation of lipid properties related to supercritical fluid extraction Yener, Meryem Esra (2001-01-01) The correlations for vapor pressures of fatty acids, fatty acid methyl and ethyl esters, and simple triglycerides were given based on the available data in the literature. The developed equations enable easy estimation of the critical properties. The group contribution methods were used to develop the estimation method. The estimated properties of the most common lipids were tabulated and the differences between the estimation methods were critically discussed.
Pretreatment processes of molasses for the utilization in fermentation processes Çalık, Pınar; Boyaci, FG; Takac, S; Ozdamer, TH (2001-01-01) The composition of beet molasses was modified by 14 pretreatment processes which were the combination of physical, physicochemical, and chemical processes, i.e. acid hydrolysis of sucrose, precipitation of metal ions, removal of organic acids by ion exchange resins, and entrapment of metal ions in solution. Acid hydrolysis was favourable for glutamic acid fermentation, while the use of diluted and centrifuged molasses was advantageous for alkaline protease fermentation.
Hydrogen productivity of photosynthetic bacteria on dark fermenter effluent of potato steam peels hydrolysate Afsar, Nilufer; Ozgur, Ebru; Gurgan, Muazzez; Akkose, Sevilay; Yucel, Meral; Gündüz, Ufuk; Eroglu, Inci (2011-01-01) Hydrogen productivities of different photosynthetic bacteria have been searched on real thermophilic dark fermentation effluents (DFE). The results obtained with potato steam peels hydrolysate (PSP) DFE were compared to glucose DFE. Photobiological hydrogen production has been carried out in indoor, batch photobioreactors using several strains of purple non-sulfur (PNS) bacteria such as Rhodobacter capsulatus (DSM1710), Rhodobacter capsulatus hup- (YO3), Rhodobacter sphaeroides O.U.001 (DSM5864), Rb. sphaer...
Photocatalytic degradation of the herbicide imazapyr: do the initial degradation rates correlate with the adsorption kinetics and isotherms? Atitar, M. Faycal; Bouzıanı, Asmae; Dillert, Ralf; El Azzouzi, Mohamed; Bahnemann, Detlef W. (2018-02-01) The objective of this work is to correlate the photocatalytic degradation of the herbicide imazapyr in aqueous suspensions of the commercially available Evonik Aeroxide TiO2 P25 with the dark adsorption phenomena considering both the equilibrium state and the kinetics of adsorption. The results of this study show that the adsorption of imazapyr onto the TiO2 surface is a second-order reaction and satisfies the criteria required by the Langmuir model. The adsorbed amount of imazapyr is found to be high at pH...

Citation Formats

B. Uyar, I. Eroglu, M. Yucel, and U. Gündüz, “Photofermentative hydrogen production from volatile fatty acids present in dark fermentation effluents,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, pp. 4517–4523, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30038.