Pretreatment of methanogenic granules for immobilized hydrogen fermentation

Hu, Bo; Chen, Shulin

doi:10.1016/j.ijhydene.2007.03.005

Cited by 187 publications

(91 citation statements)

References 21 publications

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“…The results in this study were found to be slightly lower than those found by Chen et al [21], who used a higher substrate concentration and a longer retention time in a CSTR system. However, the results of this study were also found to be slightly higher than the results of Hu et al [22] using glucose as a substrate with a COD concentration of 20 g/L in upflow anaerobic sludge blanket reactor (UASBr). The hydrogen yields from the anaerobic system at both organic concentrations (16 and 1 g/L COD; Run 1 and Run 2) were not significantly different.…”

Section: Hydrogen Production At Different Organic Loadingscontrasting

confidence: 90%

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Hydrogen Production in the Anaerobic Treatment of Domestic-Grade Synthetic Wastewater

et al. 2015

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Abstract:The aim of this study was to evaluate the potential of domestic wastewater for anaerobic hydrogen production. High-strength and ordinary-strength organic loadings of synthetic wastewater, i.e., real-time domestic wastewater with and without a mixture of food waste, were tested. During operation at a high strength loading, the initial pH was maintained at 7 and then gradually decreased, and a pH of 5-5.5 was observed as the best experimental condition. A pH of 5-5.5 was controlled during the operation at an ordinary-strength loading. Maximum hydrogen yields of 1.125 mol H2/mol glucose and 1.01 mol H2/mol glucose were observed during operation at high (48 g COD/L·day) and ordinary (3 g COD/L·day) strength loadings in terms of chemical oxygen demand (COD), respectively, with hydrogen contents of 42%-53%. The operating environment of the hydrogen production system was found to be very crucial because the metabolic pathway of the microorganism and production of intermediates were found to be dynamic with the controlled environment. Smaller COD removals of 30% and 26% were observed in high-strength and ordinarystrength loadings, respectively. Organic mass balance in terms of COD described the distribution of organics in the system via reactor byproducts. The findings of this study can be applied during the design of onsite domestic wastewater and energy recovery systems.

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Section: Hydrogen Production At Different Organic Loadingscontrasting

confidence: 90%

“…Various studies revealed that a pH of 5-6 is ideal in avoiding methanogenesis and solventogenesis, which is a key factor for effective hydrogen generation [21,22]. The result of this study was similarly observed by Fang et al [24] who found maximum hydrogen production at a pH of 5-5.5 with a hydrogen content of 50%-60%.…”

Section: C6h12o6 → 3 Ch3coohsupporting

confidence: 84%

Hydrogen Production in the Anaerobic Treatment of Domestic-Grade Synthetic Wastewater

et al. 2015

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“…In submerged cultures, many filamentous microorganisms tend to aggregate and grow as pellets/granules. They are spherical or ellipsoidal masses of hyphae with variable internal structure, ranging from loosely packed hyphae, forming "fluffy" pellets, to tightly packed, compact, dense granules (Hu and Chen 2007;Hu and Chen 2008;Hu, Zhou et al 2009;Chunjie Xia 2011). Besides merits from the cell immobilization, there are several other advantages, especially for the micro-oil production: a).…”

Section: Cell Harvest and Lipid Extraction 61 Cell Harvest Methodsmentioning

confidence: 99%

Microbial Biodiesel Production - Oil Feedstocks Produced from Microbial Cell Cultivations

Zhang¹,

Hu²

2011

Biodiesel - Feedstocks and Processing Technologies

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“…The acid-shock [12] and base-shock [13] pretreatments suppress the methanogenic activity by the narrow selective growth pH range of the methanogenes (6-7.5), whereas the Clostridium populations survive in the harsh condition due to the spore-forming capability. The chemical shock methods such as chloroform [14] and 2-bromoethanesulfonic acid (BESA) [15] have a complex structure, analog to the methanogenic coenzyme, and it acts as a inhibitor for the methanogenes. This method facilitated the suppression of the methanogenes, whereas the other non-spore-forming hydrogen producers such as Enterobacter sp.…”

Section: Inoculum Pretreatmentmentioning

confidence: 99%

Biohydrogen Production from Wastewaters

Sivagurunathan¹,

Kumar²,

Pugazhendhi³

et al. 2017

Biological Wastewater Treatment and Resource Recovery

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Biohydrogen production technology is an emerging ield for the advanced wastewater treatment with cogeneration of energy. Besides, hydrogen is an excellent candidate with high energy value (122 kJ/g) than other known carbon-based fuels with no adverse efects to the environment as it releases only water vapor as the by-products during the combustion. Biohydrogen production technology can be assisted through two major pathways: (a) light-dependent reaction (biophotolysis and photofermentation) and (b) light-independent reaction (dark fermentation and microbial electrohydrogenesis cells). The light-dependent reaction can be catalyzed by photosynthetic bacteria, whereas the dark fermentation catalyzed by the heterotrophic bacterial group of facultative and obligate anaerobes. The wastewaters are a rich source of organic nutrients which supports the growth of hydrogen producers along with the disposal of waste and energy recovery. In the present chapter, the recent advancements on biohydrogen production technology from wastewaters with respect to the (a) inoculum development, (b) process optimization, (c) scale-up and (d) the challenges and perspectives toward the improvement of this emerging technology for the wastewater treatment.

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Pretreatment of methanogenic granules for immobilized hydrogen fermentation

Cited by 187 publications

References 21 publications

Hydrogen Production in the Anaerobic Treatment of Domestic-Grade Synthetic Wastewater

Hydrogen Production in the Anaerobic Treatment of Domestic-Grade Synthetic Wastewater

Microbial Biodiesel Production - Oil Feedstocks Produced from Microbial Cell Cultivations

Biohydrogen Production from Wastewaters

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