Biological hydrogen production in suspended and attached growth anaerobic reactor systems

Gavala, Hariklia N.; Skiadas, Ioannis V.; Ahring, Birgitte Kiær

doi:10.1016/j.ijhydene.2005.09.009

Cited by 155 publications

(59 citation statements)

References 36 publications

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“…State-of-the-art technologies, such as granulation, attached growth systems, and anaerobic membrane bioreactors, retain biomass, separating the solids (or biomass) retention time (SRT) from the hydraulic retention time (HRT); this reduces the risk of biomass washout and enables more flexible process control. 7,13,14,[19][20][21] These systems, however, still provide little control over the microbial community present or biomass concentration. 22,23 This leads to organisms outcompeting desired phenotypes with a loss of resource production.…”

Section: Introductionmentioning

confidence: 99%

Achieving high-rate hydrogen recovery from wastewater using customizable alginate polymer gel matrices encapsulating biomass

Zhu

Arnold

Sakkos

et al. 2018

Environ. Sci.: Water Res. Technol.

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aIn addition to methane gas, higher-value resources such as hydrogen gas are produced during anaerobic wastewater treatment. They are, however, immediately consumed by other organisms. To recover these high-value resources, not only do the desired phenotypes need to be retained in the anaerobic reactor, but the undesired ones need to be washed out. In this study, a well-established alginate-based polymer gel, with and without a coating layer, was used to selectively encapsulate hydrogen-producing biomass in beads to achieve high-rate recovery of hydrogen during anaerobic wastewater treatment. , as well as a composite coating on the beads, consisting of alternating layers of polyethylenimine and silica hydrogel, were investigated with respect to their performance, specifically, their mass transfer characteristics and their differential ability to retain the encapsulated biomass. Although the coating reduced the escape rate of encapsulated biomass from the beads, all alginate polymer matrices without coating effectively retained biomass. Fast diffusion of dissolved organic carbon (DOC) through the polymer gel was observed in both Ca-alginate and Sr-alginate without coating. The coating, however, decreased either the diffusivity or the permeability of the DOC depending on whether the DOC was from synthetic wastewater (more lipids and proteins) or real brewery wastewater (more sugars). Consequently, the encapsulation system with coating became diffusion limited when brewery wastewater with high chemical oxygen demand was fed, resulting in a lower hydrogen production rate than the uncoated encapsulation systems. In all cases the encapsulated biomass was able to produce hydrogen, even at a hydraulic residence time of 45 min. Although there are limitations to this system, the used of encapsulated biomass for resource recovery from wastewater shows promise, particularly for highrate systems in which the retention of specific phenotypes is desired.

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Section: Introductionmentioning

confidence: 99%

Achieving high-rate hydrogen recovery from wastewater using customizable alginate polymer gel matrices encapsulating biomass

Zhu

Arnold

Sakkos

et al. 2018

Environ. Sci.: Water Res. Technol.

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“…At a pH of 6, the high hydrogen production was no longer observed when acetic and butyric acids were present in high quantities. The lower hydrogen production even with a high acetate production could be explained by the microbial transformation of glucose into acetate, as shown in equation 1, explained by Gavala et al [27]. When the system was tested at a pH lower than 5, slightly lower hydrogen production was observed.…”

Section: Role Of Operating Ph On Hydrogen Productionmentioning

confidence: 84%

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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“…For higher loadings the observed ethanol production rate diminishes either due to a metabolic shift of the biomass or due to its consumption. Ethanol has also been detected in other hydrogen producing systems operated at pH 5.5 and various HRT and OLR (Gavala et al, 2006;Karadag & Puhakka, 2010a;Kim et al, 2006;Shen et al, 2009) as a product either of enterobacterial (Hallenbeck, 2005), clostridial hydrogen production (Akutsu et al, 2009;Lin & Lay, 2004), or heterolactic bacteria (Kandler, 1983). In the case of clostridia, it has been suggested that ethanol is produced during the late growth phase during which no hydrogen is produced, while H2 production is favored during the exponential growth phase, during which the organic acids are produced (Nath & Das, 2004), yielding at the end of a batch fermentation a ratio of 1:1.…”

Section: Reactor Operationmentioning

confidence: 97%

Fermentative Hydrogen Production by Molasses; Effect of Hydraulic Retention Time, Organic Loading Rate and Microbial Dynamics

Mariakakis¹,

Meyer²,

Steinmetz³

2012

Hydrogen Energy - Challenges and Perspectives

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Biological hydrogen production in suspended and attached growth anaerobic reactor systems

Cited by 155 publications

References 36 publications

Achieving high-rate hydrogen recovery from wastewater using customizable alginate polymer gel matrices encapsulating biomass

Achieving high-rate hydrogen recovery from wastewater using customizable alginate polymer gel matrices encapsulating biomass

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

Fermentative Hydrogen Production by Molasses; Effect of Hydraulic Retention Time, Organic Loading Rate and Microbial Dynamics

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