Bioethanol

Groenestijn, J.W. van; Abubackar, Haris Nalakath; Veiga, María C.; Kennes, Christian

doi:10.1002/9781118523360.ch18

Cited by 10 publications

(9 citation statements)

References 86 publications

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“…In the bottle experiments, ethanol and acetic acid production started immediately, without any lag phase ( Figure S1 ). It could be concluded that in these experiments the Clostridium strain follows the metabolic route that converts acetyl-CoA to acetaldehyde, followed by reduction to ethanol via a bifunctional acetaldehyde/ethanol dehydrogenase ( Figure 1 ) [ 1 ]. Hence, in this CO fermentation, there were no differentiated acetogenic or ethanologenic phases.…”

Section: Resultsmentioning

confidence: 99%

“…Carbon monoxide (CO) is emitted in large amounts in the form of industrial waste gases generated during the incomplete combustion of carbon-containing materials. It is also a major component of synthesis gas [ 1 ]. Some anaerobic bacteria have the ability to grow on CO as their sole carbon source and metabolize it to a variety of fuels and chemicals [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

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Ethanol and Acetic Acid Production from Carbon Monoxide in a Clostridium Strain in Batch and Continuous Gas-Fed Bioreactors

Abubackar

Veiga

Kennes

2015

IJERPH

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The effect of different sources of nitrogen as well as their concentrations on the bioconversion of carbon monoxide to metabolic products such as acetic acid and ethanol by Clostridium autoethanogenum was studied. In a first set of assays, under batch conditions, either NH4Cl, trypticase soy broth or yeast extract (YE) were used as sources of nitrogen. The use of YE was found statistically significant (p < 0.05) on the product spectrum in such batch assays. In another set of experiments, three bioreactors were operated with continuous CO supply, in order to estimate the effect of running conditions on products and biomass formation. The bioreactors were operated under different conditions, i.e., EXP1 (pH = 5.75, YE 1g/L), EXP2 (pH = 4.75, YE 1 g/L) and EXP3 (pH = 5.75, YE 0.2 g/L). When compared to EXP2 and EXP3, it was found that EXP1 yielded the maximum biomass accumulation (302.4 mg/L) and products concentrations, i.e., acetic acid (2147.1 mg/L) and ethanol (352.6 mg/L). This can be attributed to the fact that the higher pH and higher YE concentration used in EXP1 stimulated cell growth and did, consequently, also enhance metabolite production. However, when ethanol is the desired end-product, as a biofuel, the lower pH used in EXP2 was more favourable for solventogenesis and yielded the highest ethanol/acetic acid ratio, reaching a value of 0.54.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ethanol and Acetic Acid Production from Carbon Monoxide in a Clostridium Strain in Batch and Continuous Gas-Fed Bioreactors

Abubackar

Veiga

Kennes

2015

IJERPH

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“…Ethanol is an oxygenated, water‐free, high octane alcohol that can replace gasoline or it can be mixed with it at different ratios . Butanol is more similar to gasoline than ethanol, besides being less hygroscopic, less corrosive and having a higher caloric content than ethyl alcohol . It can be blended with gasoline at higher concentrations than ethanol without the need for modifying existing engines .…”

Section: Introductionmentioning

confidence: 99%

Effect of pH control on the anaerobic H‐B‐E fermentation of syngas in bioreactors

Fernández-Naveira

Veiga

Kennes

2017

J of Chemical Tech & Biotech

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BACKGROUND Syngas and some waste gases are composed mainly of carbon monoxide, carbon dioxide and hydrogen, which can be used by some acetogenic bacteria to produce ethanol, butanol or hexanol, and represents an attractive alternative to the conventional ABE (acetone–butanol–ethanol) fermentation. Experiments were carried out in bioreactors under different conditions (pH 5.75 and 4.75) with continuous supply of a mixture of CO/CO2/H2/N2 converted by Clostridium carboxidivorans into hexanol, butanol and ethanol (H‐B‐E fermentation). RESULTS Applying different pH control strategies will affect the syngas fermentation pattern, among others in terms of bioconversion rates as well as final concentrations of acids and alcohols. The highest concentrations of alcohols were obtained at pH 5.75, i.e. 2.7 g L−1 ethanol, 1.9 g L−1 butanol and 0.85 g L−1 hexanol, whereas the maximum production rates were observed at pH 4.75, reaching 0.048 g‐ethanol h−1 g−1‐biomass, 0.037 g‐butanol h−1 g−1‐biomass, and 0.026 g‐hexanol h−1 g−1‐biomass. However, a low pH negatively affects growth and acids production in the first metabolic step, with lower growth and acids production at pH 4.75 than 5.75. Growth rates reached 0.0057 h−1 and 0.072 h−1, respectively, at pH 4.75 and 5.75. CONCLUSIONS Maintaining initially a higher pH of 5.75 allows accumulating higher concentrations of acids than when natural acidification takes place. Such higher concentrations of acids allow the production of higher amounts of alcohols as end metabolites, showing the importance of pH on bioconversion and biomass growth. © 2017 Society of Chemical Industry

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“…Significant progress has been made with mixtures of hydrogen gas and carbon monoxide for the biological production of ethanol. 64 Lanzatech operates a number of pilot plants in China that can produce 300 tons of ethanol per…”

Section: This a Relatively New Development But Is Already Operating Omentioning

confidence: 99%

Biomass for the Circular Economy : Everything you wanted to know about biomass but were afraid to ask

Groenestijn¹,

Chains²,

Harmsen³

et al. 2019

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Bioethanol

Cited by 10 publications

References 86 publications

Ethanol and Acetic Acid Production from Carbon Monoxide in a Clostridium Strain in Batch and Continuous Gas-Fed Bioreactors

Ethanol and Acetic Acid Production from Carbon Monoxide in a Clostridium Strain in Batch and Continuous Gas-Fed Bioreactors

Effect of pH control on the anaerobic H‐B‐E fermentation of syngas in bioreactors

Biomass for the Circular Economy : Everything you wanted to know about biomass but were afraid to ask

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