Enhancement of hydrogen production from glucose by nitrogen gas sparging

Muta, Osamu; Dinsdale, Richard M.; Hawkes, Freda R.; Hawkes, D.L.; Noike, Tatsuya

doi:10.1016/s0960-8524(99)00130-3

Cited by 507 publications

(203 citation statements)

References 26 publications

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“…In this case PFOR cleaves pyruvate to acetyl-CoA and CO 2 , transferring electrons to ferredoxin, which is coupled to a reversible hydrogenase to produce H 2 . In this situation, all H 2 is produced by a single reversible reaction and it is even more important to maintain a low pH 2 (Kataoka et al 1997;Mizuno et al 2000). Advances in gas separation technology may permit a purgegas recycle system to remove the need for large quantities of inert, anaerobic purge gas for H 2 removal (Nielsen et al 2001;Liang et al 2002;Teplyakov et al 2002).…”

Section: Axenic Dark Fermentationsmentioning

confidence: 99%

Integrating dark and light bio-hydrogen production strategies: towards the hydrogen economy

Redwood

Paterson-Beedle

Macaskie

2008

Rev Environ Sci Biotechnol

138

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Biological methods of hydrogen production are preferable to chemical methods because of the possibility to use sunlight, CO 2 and organic wastes as substrates for environmentally benign conversions, under moderate conditions. By combining different microorganisms with different capabilities, the individual strengths of each may be exploited and their weaknesses overcome. Mechanisms of bio-hydrogen production are described and strategies for their integration are discussed. Dual systems can be divided broadly into wholly light-driven systems (with microalgae/cyanobacteria as the 1 st stage) and partially light-driven systems (with a dark, fermentative initial reaction). Review and evaluation of published data suggests that the latter type of system holds greater promise for industrial application. This is because the calculated land area required for a wholly light-driven dual system would be too large for either centralised (macro-) or decentralised (micro-)energy generation. The potential contribution to the hydrogen economy of partially light-driven dual systems is overviewed alongside that of other bio-fuels such as bio-methane and bio-ethanol.Redwood et al. -Dual systems for Bio-H 2 -Reviews in Environ. Sci. Bio/Technol. 8:149 http://dx

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Section: Axenic Dark Fermentationsmentioning

confidence: 99%

Integrating dark and light bio-hydrogen production strategies: towards the hydrogen economy

Redwood

Paterson-Beedle

Macaskie

2008

Rev Environ Sci Biotechnol

138

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“…The reactor was mixed at 200 rpm using a magnetic stirrer and run at room temperature (23jC). Oxygen in the influent was removed by gas (N 2 ) sparging for 10 min (Mizuno et al, 2000). The reactor was operated under steady-state conditions at each loading rate for 20 days or longer prior to collection and analysis of flocs.…”

Section: Reactor Operationmentioning

confidence: 99%

“…Harvesting hydrogen from organic waste by an anaerobic process has drawn increased attention in recent years (Kataoka et al, 1997;Lin and Chang, 1999;Mizuno et al, 2000;Lay, 2000;Logan et al, 2002). While pure cultures can be used to make hydrogen, it is also known that mixed cultures can also be used as long as hydrogen consumption by methanogens and other bacteria is inhibited through control of reactor detention time, temperature, and pH (Tanisho et al, 1989;Dabrock et al, 1992;Nakamura et al, 1993;Logan et al, 2002;Oh et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Physical and hydrodynamic properties of flocs produced during biological hydrogen production

Zhang¹,

Li²,

Oh³

et al. 2004

Biotech & Bioengineering

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Dense flocs readily form in continuous culture bioreactors used for hydrogen production, but the fractal and hydrodynamic properties of these flocs have not been previously analyzed. We therefore examined the size distribution, fractal dimension, and hydrodynamic properties of flocs formed in a continuous flow, well-mixed reactor treating synthetic wastewater at a fixed condition of a 4.5 h hydraulic detention time (23jC, pH 5.5). The reactor was operated for a total of 3 months at three different organic loading rates (27, 53, and 80 g-COD/L-d) with influent glucose concentrations of 5, 10, and 15 g-COD/L. At all three loading rates the removal of glucose was nearly complete (98.6 -99.4%) and biomass was produced in proportion to the organic loading rate (0.86 F 0.11, 2.40 F 0.26, and 4.59 F 1.55 g/L of MLVSS in the reactor). Overall conversion efficiencies of glucose to hydrogen, evaluated on the basis of a maximum of 4 mol-H 2 /molglucose, increased with organic loading rates in the order 17.7%, 23.1%, and 25.6%. The gas contained 56.1 F 4.9% hydrogen, with the balance as carbon dioxide. No methane gas was detected. Under these conditions, flocs were produced with mean sizes that increased with organic loading, in the order 0.12 cm (5 g-COD/L), 0.35 cm (10 g-COD/L), and 0.58 cm (15 g-COD/L). As the average floc size increased, the flocs became on average denser and less fractal, with fractal dimensions increasing from 2.11 F 0.17 to 2.48 F 0.13. Floc porosities ranged from 0.75 -0.96, and resulted in aggregate densities that allowed little intra-aggregate flow through the floc. As a result, average settling velocities were not appreciably larger than those predicted by Stokes' law for spherical, impermeable flocs. Our results demonstrate that dense, relatively impermeable flocs are produced in biohydrogen reactors that have settling properties in reasonable agreement with Stokes' law. B 2004 Wiley Periodicals, Inc.

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“…organic acids). Hence, dark fermentation is the most commonly used method in biological hydrogen production, especially when combined with waste treatment [3].…”

Section: Introductionmentioning

confidence: 99%

Bio-hydrogen production from thin stillage using conventional and acclimatized anaerobic digester sludge

Nasr

Elbeshbishy

Hafez

et al. 2011

International Journal of Hydrogen Energy

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Enhancement of hydrogen production from glucose by nitrogen gas sparging

Cited by 507 publications

References 26 publications

Integrating dark and light bio-hydrogen production strategies: towards the hydrogen economy

Integrating dark and light bio-hydrogen production strategies: towards the hydrogen economy

Physical and hydrodynamic properties of flocs produced during biological hydrogen production

Bio-hydrogen production from thin stillage using conventional and acclimatized anaerobic digester sludge

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