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Continuous Ethanol Fermentation of Pretreated Lignocellulosic Biomasses, Waste Biomasses, Molasses and Syrup Using the Anaerobic, Thermophilic Bacterium Thermoanaerobacter italicus Pentocrobe 411.

Andersen RL, Jensen KM, Mikkelsen MJ - PLoS ONE (2015)

Bottom Line: However, challenges are still to be overcome throughout the process and particularly for the fermentation of the complex sugar mixtures resulting from the hydrolysis of hemicellulose.All fermentations resulted in close to maximum theoretical ethanol yields of 0.47-0.49 g/g (based on glucose, xylose, and arabinose), volumetric ethanol productivities of 1.2-2.7 g/L/h and a total sugar conversion of 90-99% including glucose, xylose and arabinose.The results solidify the potential of Thermoanaerobacter strains as candidates for lignocellulose bioconversion.

View Article: PubMed Central - PubMed

Affiliation: Estibio ApS, Ballerup, Denmark.

ABSTRACT
Lignocellosic ethanol production is now at a stage where commercial or semi-commercial plants are coming online and, provided cost effective production can be achieved, lignocellulosic ethanol will become an important part of the world bio economy. However, challenges are still to be overcome throughout the process and particularly for the fermentation of the complex sugar mixtures resulting from the hydrolysis of hemicellulose. Here we describe the continuous fermentation of glucose, xylose and arabinose from non-detoxified pretreated wheat straw, birch, corn cob, sugar cane bagasse, cardboard, mixed bio waste, oil palm empty fruit bunch and frond, sugar cane syrup and sugar cane molasses using the anaerobic, thermophilic bacterium Thermoanaerobacter Pentocrobe 411. All fermentations resulted in close to maximum theoretical ethanol yields of 0.47-0.49 g/g (based on glucose, xylose, and arabinose), volumetric ethanol productivities of 1.2-2.7 g/L/h and a total sugar conversion of 90-99% including glucose, xylose and arabinose. The results solidify the potential of Thermoanaerobacter strains as candidates for lignocellulose bioconversion.

No MeSH data available.


Related in: MedlinePlus

Time course of continuous fermentation of un-detoxified corn cob hydrolysate using the thermophilic anaerobic bacterium Thermoanaerobacter Pentocrobe 411X.Inf: HPLC data from the influent bottle. Eff: HPLC data from the reactor effluent. Ethanol (eff) is a combination of ethanol in the reactor effluent and ethanol from the gas phase exiting the reactor system. The conversion of sugars in % is based on the concentration in the reactor relative to the concentration in the influent. HRT: Hydraulic retention time.
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pone.0136060.g003: Time course of continuous fermentation of un-detoxified corn cob hydrolysate using the thermophilic anaerobic bacterium Thermoanaerobacter Pentocrobe 411X.Inf: HPLC data from the influent bottle. Eff: HPLC data from the reactor effluent. Ethanol (eff) is a combination of ethanol in the reactor effluent and ethanol from the gas phase exiting the reactor system. The conversion of sugars in % is based on the concentration in the reactor relative to the concentration in the influent. HRT: Hydraulic retention time.

Mentions: The values are an average of data collected over five residence times at steady-state. Csugar(max): Average total concentration of glucose, xylose, arabinose, and sucrose in the period of data collection. The ratio between sugars can be derived from Table 1. The time course profiles of the WS97-N2, WS80, CC02-N2, and CS02-N2 fermentations are shown in Figs 1, 2, 3, and 4, respectively. CEtOH: Concentration of ethanol corrected for loss of ethanol based on redox balance. QEtOH: Volumetric ethanol productivity. YEtOH(GXA): Yield of ethanol based on influent glucose, xylose, and arabinose. YEtOH(GX): Yield of ethanol based on influent glucose and xylose. DMmax: The biomass dry matter after pretreatment corresponding to the total sugar applied in the data collection period. Conv(GXA): Conversion of glucose, xylose and arabinose in based on effluent levels relative to influent levels. HRT: Hydraulic retention time.


Continuous Ethanol Fermentation of Pretreated Lignocellulosic Biomasses, Waste Biomasses, Molasses and Syrup Using the Anaerobic, Thermophilic Bacterium Thermoanaerobacter italicus Pentocrobe 411.

Andersen RL, Jensen KM, Mikkelsen MJ - PLoS ONE (2015)

Time course of continuous fermentation of un-detoxified corn cob hydrolysate using the thermophilic anaerobic bacterium Thermoanaerobacter Pentocrobe 411X.Inf: HPLC data from the influent bottle. Eff: HPLC data from the reactor effluent. Ethanol (eff) is a combination of ethanol in the reactor effluent and ethanol from the gas phase exiting the reactor system. The conversion of sugars in % is based on the concentration in the reactor relative to the concentration in the influent. HRT: Hydraulic retention time.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4546601&req=5

pone.0136060.g003: Time course of continuous fermentation of un-detoxified corn cob hydrolysate using the thermophilic anaerobic bacterium Thermoanaerobacter Pentocrobe 411X.Inf: HPLC data from the influent bottle. Eff: HPLC data from the reactor effluent. Ethanol (eff) is a combination of ethanol in the reactor effluent and ethanol from the gas phase exiting the reactor system. The conversion of sugars in % is based on the concentration in the reactor relative to the concentration in the influent. HRT: Hydraulic retention time.
Mentions: The values are an average of data collected over five residence times at steady-state. Csugar(max): Average total concentration of glucose, xylose, arabinose, and sucrose in the period of data collection. The ratio between sugars can be derived from Table 1. The time course profiles of the WS97-N2, WS80, CC02-N2, and CS02-N2 fermentations are shown in Figs 1, 2, 3, and 4, respectively. CEtOH: Concentration of ethanol corrected for loss of ethanol based on redox balance. QEtOH: Volumetric ethanol productivity. YEtOH(GXA): Yield of ethanol based on influent glucose, xylose, and arabinose. YEtOH(GX): Yield of ethanol based on influent glucose and xylose. DMmax: The biomass dry matter after pretreatment corresponding to the total sugar applied in the data collection period. Conv(GXA): Conversion of glucose, xylose and arabinose in based on effluent levels relative to influent levels. HRT: Hydraulic retention time.

Bottom Line: However, challenges are still to be overcome throughout the process and particularly for the fermentation of the complex sugar mixtures resulting from the hydrolysis of hemicellulose.All fermentations resulted in close to maximum theoretical ethanol yields of 0.47-0.49 g/g (based on glucose, xylose, and arabinose), volumetric ethanol productivities of 1.2-2.7 g/L/h and a total sugar conversion of 90-99% including glucose, xylose and arabinose.The results solidify the potential of Thermoanaerobacter strains as candidates for lignocellulose bioconversion.

View Article: PubMed Central - PubMed

Affiliation: Estibio ApS, Ballerup, Denmark.

ABSTRACT
Lignocellosic ethanol production is now at a stage where commercial or semi-commercial plants are coming online and, provided cost effective production can be achieved, lignocellulosic ethanol will become an important part of the world bio economy. However, challenges are still to be overcome throughout the process and particularly for the fermentation of the complex sugar mixtures resulting from the hydrolysis of hemicellulose. Here we describe the continuous fermentation of glucose, xylose and arabinose from non-detoxified pretreated wheat straw, birch, corn cob, sugar cane bagasse, cardboard, mixed bio waste, oil palm empty fruit bunch and frond, sugar cane syrup and sugar cane molasses using the anaerobic, thermophilic bacterium Thermoanaerobacter Pentocrobe 411. All fermentations resulted in close to maximum theoretical ethanol yields of 0.47-0.49 g/g (based on glucose, xylose, and arabinose), volumetric ethanol productivities of 1.2-2.7 g/L/h and a total sugar conversion of 90-99% including glucose, xylose and arabinose. The results solidify the potential of Thermoanaerobacter strains as candidates for lignocellulose bioconversion.

No MeSH data available.


Related in: MedlinePlus