Modeling and optimization of anaerobic digested sludge converting starch to hydrogen

Lay, Jiunn‐Jyi

doi:10.1002/(sici)1097-0290(20000505)68:3<269::aid-bit5>3.0.co;2-t

Cited by 434 publications

(203 citation statements)

References 28 publications

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“…The optimal pH values were reported for hydrogen production from sludge, i.e. pH 5.0-5.5 and pH 7.0 for batch fermentation of wastewater sludge [10][11][12][13] and waste activated sludge 1) , respectively. However, in this study, the optimal pH value of hydrogen production from alkali-pretreated sludge was 9.5.…”

Section: Effect Of Initial Ph On Hydrogen Productionmentioning

confidence: 99%

“…Pretreatments, like mechanical disintegrations, thermal hydrolysis, and chemical or thermo-chemical hydrolysis, can disrupt the cells effectively and have been used to promote the anaerobic digestion of sludge [2,[7][8][9] and the hydrogen production from anaerobic fermentation of sludge [10][11][12] . After pretreatment (ultrasonication, acidification, sterilization, or freezing/ thawing), the sludge was applied to producing hydrogen by Clostridium bifermentans [11][12][13] . Lin et al 2) had succeeded in using alkaline-hydrolyzed waste activated sludge to produce hydrogen with heated sludge as seed, and the hydrogen yield reached 1.7 g·kg TCOD -1…”

mentioning

confidence: 99%

“…pH value is an important factor that affects the biological hydrogen production. The effect of pH value on the hydrogen production of carbohydrates has been studied by many researchers [13][14][15] . However, little work discussed the effect of pH even though it is really a critical factor ruling over the anaerobic reactions.…”

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pH dependency of hydrogen fermentation from alkali-pretreated sludge

Xiao

Liu

2006

CHINESE SCI BULL

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Batch tests were carried out to study the possibility of hydrogen production from alkali-pretreated sludge without seed and the pH dependency of hydrogen fermentation from alkali-pretreated sludge. Experimental results showed that the sewage sludge with alkali-pretreatment could be successfully applied to biologically producing hydrogen without seed and extra-feed. The results also showed that the initial pH value of sewage sludge was an important factor throughout the hydrogen fermentation of alkali-pretreated sludge. The maximum hydrogen yield was obtained at initial pH value of 11.0 (14.4 mL·g VS -1 ). The hydrogen yield of alkali-pretreated sludge at alkaline initial pH value was much higher than that of acidic or neutral initial pH value. The optimal pH value of hydrogen production from alkalipretreated sludge was approximately 9.5. The consumption of hydrogen could be inhibited when the pH value of sludge was above 8.5. The change of hydrogen yield at various initial pH values was similar to that of sludge SCOD. The change of sludge pH value was slow and acetate was the major component of volatile fatty acids produced in the process of hydrogen production. The yield and the constitution of volatile fatty acids were sensitive to the initial pH value.

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Section: Effect Of Initial Ph On Hydrogen Productionmentioning

confidence: 99%

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confidence: 99%

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pH dependency of hydrogen fermentation from alkali-pretreated sludge

Xiao

Liu

2006

CHINESE SCI BULL

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“…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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“…This includes molasses [31,32] and cheese whey [33,34], which have been evaluated under continuous stirred tank reactor (CSTR) and immobilized system configurations. Besides, H2 production from soluble and particulate starch and cellulose [35,36], xylose [37], sugar beet [38], wastewater from a sugar beet refinery [39] and the bottom layer from a beer manufacturing plant [40] has also been demonstrated.…”

Section: Biohydrogen Production Systemsmentioning

confidence: 99%

Biohydrogen Production from Lignocellulosic Biomass: Technology and Sustainability

et al. 2015

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Among the various renewable energy sources, biohydrogen is gaining a lot of traction as it has very high efficiency of conversion to usable power with less pollutant generation. The various technologies available for the production of biohydrogen from lignocellulosic biomass such as direct biophotolysis, indirect biophotolysis, photo, and dark fermentations have some drawbacks (e.g., low yield and slower production rate, etc.), which limits their practical application. Among these, metabolic engineering is presently the most promising for the production of biohydrogen as it overcomes most of the limitations in other technologies. Microbial electrolysis is another recent technology that is progressing very rapidly. However, it is the dark fermentation approach, followed by photo fermentation, which seem closer to commercialization. Biohydrogen production from lignocellulosic biomass is particularly suitable for relatively small and decentralized systems and it can be considered as an important sustainable and renewable energy source. The comprehensive life cycle assessment (LCA) of biohydrogen production from lignocellulosic biomass and its comparison with other biofuels can be a tool for policy decisions. In this paper, we discuss the various possible approaches for producing biohydrogen from lignocellulosic biomass which is an globally available abundant resource. The main technological challenges are discussed in detail, followed by potential solutions.

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Modeling and optimization of anaerobic digested sludge converting starch to hydrogen

Cited by 434 publications

References 28 publications

pH dependency of hydrogen fermentation from alkali-pretreated sludge

pH dependency of hydrogen fermentation from alkali-pretreated sludge

Physical and hydrodynamic properties of flocs produced during biological hydrogen production

Biohydrogen Production from Lignocellulosic Biomass: Technology and Sustainability

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