The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Ufuk Gündüz - One of the best experts on this subject based on the ideXlab platform.
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photofermentative hydrogen production from Volatile Fatty Acids present in dark fermentation effluents
International Journal of Hydrogen Energy, 2009Co-Authors: Basar Uyar, Meral Yücel, Inci Eroglu, Ufuk GündüzAbstract:Abstract 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 (VFA) 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 /l 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.
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Photofermentative hydrogen production from Volatile Fatty Acids present in dark fermentation effluents
International Journal of Hydrogen Energy, 2009Co-Authors: Basar Uyar, Meral Yücel, Inci Eroglu, Ufuk GündüzAbstract: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 (VFA) 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 mlhydrogen/lreactor 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. © 2008 International Association for Hydrogen Energy.
Wenquan Ruan - One of the best experts on this subject based on the ideXlab platform.
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in situ Volatile Fatty Acids influence biogas generation from kitchen wastes by anaerobic digestion
Bioresource Technology, 2014Co-Authors: Zhiyang Xu, Hengfeng Miao, Zhenxing Huang, Mingxing Zhao, Wenquan RuanAbstract:Abstract Anaerobic digestion is considered to be an efficient way of disposing kitchen wastes, which can not only reduce waste amounts, but also produce biogas. However, the excessive accumulation of Volatile Fatty Acids (VFA) caused by high organic loads will inhibit anaerobic digestion intensively. Effects of the VFA composition on biogas generation and microbial community are still required for the investigation under various organic loads of kitchen wastes. Our results showed that the maximum specific methane production was 328.3 ml g TS−1, and acetic acid was the main inhibitor in methanogenesis. With the increase of organic load, aceticlastic methanogenesis was more sensitive to acetic acid than hydrogenotrophic methanogenesis. Meanwhile, methanogenic microbial community changed significantly, and few species grew well under excessive organic loads. This study provides an attempt to reveal the mechanism of VFA inhibition in anaerobic digestion of kitchen wastes.
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In situ Volatile Fatty Acids influence biogas generation from kitchen wastes by anaerobic digestion
Bioresource Technology, 2014Co-Authors: Zhiyang Xu, Hengfeng Miao, Shumei Gao, Zhenxing Huang, Mingxing Zhao, Wenquan RuanAbstract:Anaerobic digestion is considered to be an efficient way of disposing kitchen wastes, which can not only reduce waste amounts, but also produce biogas. However, the excessive accumulation of Volatile Fatty Acids (VFA) caused by high organic loads will inhibit anaerobic digestion intensively. Effects of the VFA composition on biogas generation and microbial community are still required for the investigation under various organic loads of kitchen wastes. Our results showed that the maximum specific methane production was 328.3mlgTS-1, and acetic acid was the main inhibitor in methanogenesis. With the increase of organic load, aceticlastic methanogenesis was more sensitive to acetic acid than hydrogenotrophic methanogenesis. Meanwhile, methanogenic microbial community changed significantly, and few species grew well under excessive organic loads. This study provides an attempt to reveal the mechanism of VFA inhibition in anaerobic digestion of kitchen wastes. © 2014 Elsevier Ltd.
Basar Uyar - One of the best experts on this subject based on the ideXlab platform.
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photofermentative hydrogen production from Volatile Fatty Acids present in dark fermentation effluents
International Journal of Hydrogen Energy, 2009Co-Authors: Basar Uyar, Meral Yücel, Inci Eroglu, Ufuk GündüzAbstract:Abstract 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 (VFA) 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 /l 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.
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Photofermentative hydrogen production from Volatile Fatty Acids present in dark fermentation effluents
International Journal of Hydrogen Energy, 2009Co-Authors: Basar Uyar, Meral Yücel, Inci Eroglu, Ufuk GündüzAbstract: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 (VFA) 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 mlhydrogen/lreactor 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. © 2008 International Association for Hydrogen Energy.
Zhiyang Xu - One of the best experts on this subject based on the ideXlab platform.
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in situ Volatile Fatty Acids influence biogas generation from kitchen wastes by anaerobic digestion
Bioresource Technology, 2014Co-Authors: Zhiyang Xu, Hengfeng Miao, Zhenxing Huang, Mingxing Zhao, Wenquan RuanAbstract:Abstract Anaerobic digestion is considered to be an efficient way of disposing kitchen wastes, which can not only reduce waste amounts, but also produce biogas. However, the excessive accumulation of Volatile Fatty Acids (VFA) caused by high organic loads will inhibit anaerobic digestion intensively. Effects of the VFA composition on biogas generation and microbial community are still required for the investigation under various organic loads of kitchen wastes. Our results showed that the maximum specific methane production was 328.3 ml g TS−1, and acetic acid was the main inhibitor in methanogenesis. With the increase of organic load, aceticlastic methanogenesis was more sensitive to acetic acid than hydrogenotrophic methanogenesis. Meanwhile, methanogenic microbial community changed significantly, and few species grew well under excessive organic loads. This study provides an attempt to reveal the mechanism of VFA inhibition in anaerobic digestion of kitchen wastes.
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In situ Volatile Fatty Acids influence biogas generation from kitchen wastes by anaerobic digestion
Bioresource Technology, 2014Co-Authors: Zhiyang Xu, Hengfeng Miao, Shumei Gao, Zhenxing Huang, Mingxing Zhao, Wenquan RuanAbstract:Anaerobic digestion is considered to be an efficient way of disposing kitchen wastes, which can not only reduce waste amounts, but also produce biogas. However, the excessive accumulation of Volatile Fatty Acids (VFA) caused by high organic loads will inhibit anaerobic digestion intensively. Effects of the VFA composition on biogas generation and microbial community are still required for the investigation under various organic loads of kitchen wastes. Our results showed that the maximum specific methane production was 328.3mlgTS-1, and acetic acid was the main inhibitor in methanogenesis. With the increase of organic load, aceticlastic methanogenesis was more sensitive to acetic acid than hydrogenotrophic methanogenesis. Meanwhile, methanogenic microbial community changed significantly, and few species grew well under excessive organic loads. This study provides an attempt to reveal the mechanism of VFA inhibition in anaerobic digestion of kitchen wastes. © 2014 Elsevier Ltd.
Meral Yücel - One of the best experts on this subject based on the ideXlab platform.
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photofermentative hydrogen production from Volatile Fatty Acids present in dark fermentation effluents
International Journal of Hydrogen Energy, 2009Co-Authors: Basar Uyar, Meral Yücel, Inci Eroglu, Ufuk GündüzAbstract:Abstract 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 (VFA) 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 /l 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.
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Photofermentative hydrogen production from Volatile Fatty Acids present in dark fermentation effluents
International Journal of Hydrogen Energy, 2009Co-Authors: Basar Uyar, Meral Yücel, Inci Eroglu, Ufuk GündüzAbstract: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 (VFA) 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 mlhydrogen/lreactor 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. © 2008 International Association for Hydrogen Energy.
