Homoacetogenesis during hydrogen production by mixed cultures dark fermentation: Unresolved challenge

Saady, Noori M. Cata

doi:10.1016/j.ijhydene.2013.07.122

Cited by 413 publications

(205 citation statements)

References 165 publications

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“…are built up by co-existing and synergic species [24]. However, in most cases, they naturally occur together with H 2 -consumer microorganism such as methanogenic archaea, homoacetogenic (producing acetate from CO 2 and H 2 )-, lactic-and propionic acid bacteria which must certainly be suppressed or more preferentially totally eliminated [25]. As a consequence, regardless the source of mixed inocula, it should undergo initial pretreatment in order to select the desired whole cell biocatalysts.…”

Section: Pretreatment and Stimulationmentioning

confidence: 99%

“…[13]; however some organisms of no utility (e.g. propionic acid and homoacetogenic bacteria) may also survive and reclaim their niche over time [21,25]. Changes in the microbial background can be revealed by the modern technical apparatus of molecular biology [32,33].…”

Section: Pretreatment and Stimulationmentioning

confidence: 99%

“…Besides the adequate substrate composition and loading, temperature, pH and OPR there are other parameters such as hydrogen partial pressure in the bioreactor that may need a control since it is a potential threat that hydrogenotrophic consortial activity may be provoked under high H 2 concentrations [25]. From another point of view, reduced H 2 partial pressure was proven to increase hydrogenase activity and making H 2 formation thermodynamically favorable [47].…”

Section: Pretreatment and Stimulationmentioning

confidence: 99%

See 2 more Smart Citations

Review on the start-up experiences of continuous fermentative hydrogen producing bioreactors

Bakonyi

Nemestóthy

Simon

et al. 2014

Renewable and Sustainable Energy Reviews

110

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a b s t r a c tThe start-up of continuous biohydrogen fermentations is a complex procedure and a key to acceptable hydrogen production performance and successful long-term operation. In this review article, the experiences gained and lessons learned from relevant literature studies dealing with various aspects of H 2 producing bioreactor start-up are comprehensively surveyed. Firstly, the importance of H 2 -forming biosystem start-up including its main steps is outlined. Afterwards, the role of main influencing factors and methods (e.g. strain selection, seed pretreatment and inocula stimulation, switch-over time, bioreactor design, operating conditions) in avoiding the deterioration of starting a reactor is analyzed and presented in detail. Finally, the so far suggested applicable start-up strategies and the corresponding findings are critically discussed pointing out the advantages and disadvantages of each strategy.

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Section: Pretreatment and Stimulationmentioning

confidence: 99%

Section: Pretreatment and Stimulationmentioning

confidence: 99%

Section: Pretreatment and Stimulationmentioning

confidence: 99%

See 1 more Smart Citation

Review on the start-up experiences of continuous fermentative hydrogen producing bioreactors

Bakonyi

Nemestóthy

Simon

et al. 2014

Renewable and Sustainable Energy Reviews

110

View full text Add to dashboard Cite

show abstract

“…and Enterococcus sp. are well-known hydrogen producing bacteria capable of converting and hydrolyzing polysaccharides to short chain VFAs, hydrogen and carbon dioxide as the primary fermentation products in the AD process [38]. A long chain VFAs such as butyrate, propionate can be converted to acetate by Acetoanaerobium sp.…”

Section: Microbial Community and Methane Fermentation Performancementioning

confidence: 99%

Co-Digestion of Napier Grass and Its Silage with Cow Dung for Methane Production

2017

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Methane production from co-digestion of grass with cow dung and silage with cow dung was conducted by a bioaugmentation technique. For self-fermentation, maximum methane yield (MY) of 176.66 and 184.94 mL CH4/g-VSadded were achieved at a ratio of grass to cow dung and silage to cow dung of 1:1, respectively. A higher maximum MY of 179.59 and 208.11 mL CH4/g-VSadded was obtained from co-digestion of grass with cow dung and silage with cow dung bioaugmented with anaerobic sludge at a ratio of 3:1. The solid residue left over after co-digestion at a ratio of 3:1 was pretreated by alkaline plus enzyme before used to produce methane and a maximum MY of 333.63 and 301.38 mL CH4/g-VSadded, respectively, was achieved. Overall power generated from codigestion of grass with cow dung plus pretreated solid residues and co-digestion of silage with cow dung plus pretreated solid residues were 0.0397 and 0.007 watt, respectively.

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“…Although most of the known methanogenic microorganisms grow at near-neutral pH, 38 the hydrogenotrophic genus Methanobacterium was identified in anaerobic fluidized bed reactors operated under low pH conditions (4.0-4.5) from a cassava processing wastewater and glucose mixture. 39 During the anaerobic digestion, methane can be produced from the bioconversion of hydrogen and/or acetic acid by hydrogenotrophic, 40 and acetoclastic archaea, 41 respectively. In our study, the higher methane production (9.56 mmol L -1 ) was obtained in C3.…”

Section: Hydrogen Consumption Routesmentioning

confidence: 99%

Bioconversion of Cellulose Into Hydrogen, Biogas and Organic Acids Using Microbial Consortium From a Pulp and Paper Mill Wastewater Treatment Plant

et al. 2017

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This study evaluated the potential of a microbial consortium collected from a pulp and paper mill wastewater treatment plant (WWTP) for converting cellulose to hydrogen, biogas and organic acids. Fermentation tests were conducted in batch reactors fed with different concentrations of cellulose as substrate: (C1) . The parameters investigated were hydrogen, biogas, organic acids, carbohydrates and pH. The maximum hydrogen production was 14.77, 39.25 and 22.53 mmol L -1 , and the maximum methane was 4.40, 3.72 and 9.56 mmol L -1 , for C1, C2 and C3, respectively. Butyric acid was the main metabolite generated, with maximum concentrations of 2.2, 1.8 and 2.2 g L -1 for C1, C2 and C3, respectively. The decrease in hydrogen production was accompanied by the production of methane, acetic acid and hydrogen sulfide in the three tests, probably related to hydrogenotrophic methanogenesis, homoacetogenesis and sulfidogenesis, respectively. The phylogenetic characterization of the bacterial community was performed by cloning and sequencing analysis. The microorganisms identified in the consortium were similar (> 95%) to Clostridium sp., Klebsiella sp., Routella sp. and Desulfovibrio sp. These genera were associated with hydrogen production, degradation of cellulosic substrates, and/or hydrogen-consuming microorganisms.

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Homoacetogenesis during hydrogen production by mixed cultures dark fermentation: Unresolved challenge

Cited by 413 publications

References 165 publications

Review on the start-up experiences of continuous fermentative hydrogen producing bioreactors

Review on the start-up experiences of continuous fermentative hydrogen producing bioreactors

Co-Digestion of Napier Grass and Its Silage with Cow Dung for Methane Production

Bioconversion of Cellulose Into Hydrogen, Biogas and Organic Acids Using Microbial Consortium From a Pulp and Paper Mill Wastewater Treatment Plant

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