- Synthetic Biology: A Promising Technology for Biofuel Production

doi:10.1201/b18537-7

Cited by 21 publications

(23 citation statements)

References 104 publications

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“…furfural and lignin degradation products). 85,86 Pretreatment with just water minimizes oligosaccharide hydrolysis, while hydrating their structure by liquid water above the saturation vapor pressure of water at the operational temperature. 8 However, the high fraction of oligomers reduces the opportunity for monosaccharides to rapidly degrade to aldehydes during high temperature pretreatment, thereby increasing soluble saccharide yields.…”

Section: Flowthrough Improves Hydrothermal Pretreatmentmentioning

confidence: 99%

Strengths, challenges, and opportunities for hydrothermal pretreatment in lignocellulosic biorefineries

Yang

Tao

Wyman

2017

Biofuels Bioprod Bioref

127

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Pretreatment prior to or during biological conversion is required to achieve high sugar yields essential to economic production of fuels and chemicals from low cost, abundant lignocellulosic biomass. Aqueous thermochemical pretreatments achieve this performance objective from pretreatment coupled with subsequent enzymatic hydrolysis, but chemical pretreatment can also suffer from additional costs for exotic materials of construction, the need to recover or neutralize the chemicals, introduction of compounds that inhibit downstream operations, and waste disposal, as well as for the chemicals themselves. The simplicity of hydrothermal pretreatment with just hot water offers the potential to greatly improve the cost of the entire conversion process if sugar degradation during pretreatment, production of un-fermentable oligomers, and the amount of expensive enzymes needed to obtain satisfactory yields from hydrothermally pretreated solids can be reduced. Biorefi nery economics would also benefi t if value could be generated from lignin and other components that are currently fated to be burned for power. However, achieving these goals will no doubt require development of advanced hydrothermal pretreatment confi gurations. For example, passing water through a stationary bed of lignocellulosic biomass in a fl owthrough confi guration achieves very high yields of hemicellulose sugars, removes more than 75% of the lignin for potential valorization, and improves sugar release from the pretreated solids with lower enzyme loadings. Unfortunately, the large quantities of water needed to achieve this performance result in very dilute sugars, high energy costs for pretreatment and product recover, and large amounts of oligomers. Thus, improving our understanding of 126

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Section: Flowthrough Improves Hydrothermal Pretreatmentmentioning

confidence: 99%

Strengths, challenges, and opportunities for hydrothermal pretreatment in lignocellulosic biorefineries

Yang

Tao

Wyman

2017

Biofuels Bioprod Bioref

127

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“…The main inhibitors in prehydrolysates were acetic acid, furfural and HMF. Those inhibitors have been reported to inhibit the growth of microorganisms, reducing production of ethanol [6,19]. Other inhibitors such as formic acid and levulinic acid were not detected.…”

Section: Solid Recovery and Components Of Prehydrolysates For Combinementioning

confidence: 96%

Effect of combined inorganic with organic acids pretreatment of rice straw on its structure properties and enzymatic hydrolysis

Feng³

et al. 2017

Env Prog and Sustain Energy

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Rice straw was pretreated with sulfuric acid combined with five organic acids (oxalic acid, acetic acid, tartaric acid, succinic acid, and fumaric acid) at 121°C for 90 min with five different blending ratios. The concentrations of glucose, xylose, arabinose and inhibitors such as acetic acid, furfural and HMF (5‐hydroxymethylfurfural) in the prehydrolysate were analyzed. It demonstrated that the concentrations of both sugars and inhibitors in prehydrolysate decreased with increasing organic acids blending ratio. The different solid residues from pretreatments were subjected to enzymatic hydrolysis process. The results showed that pretreating rice straw using combined sulfuric acid with oxalic acid or fumaric acid resulted in the maximum glucose yield (∼66%) after 72 h enzymatic hydrolysis in sharp contrast to ∼58% glucose yield obtained from pretreatment only with sulfuric acid under the same conditions. Furthermore, the structure of the raw material and the pretreated rice straw were characterized by scanning electron microscopy (SEM) and Fourier transformer infrared (FTIR) spectrum to clarify the effects of the combined sulfuric acid with oxalic or fumaric acid pretreatment on disrupting the fibers, removing hemicellulose and making the cellulose structure loose. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 808–814, 2018

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“…51 Although progress has been made in developing microorganisms that have higher tolerance to inhibition, detoxification of hydrolysate is still more effective at combating the inhibitory effects. 52 Modeling and Analysis: Combined lignocellulosic / waste water bio-refinery NW Burman et al…”

Section: Risks and Opportunitiesmentioning

confidence: 99%

Evaluation of a combined lignocellulosic / waste water bio‐refinery for the simultaneous production of valuable biochemical products and the remediation of acid mine drainage

Burman

Harding

Sheridan

et al. 2018

Biofuels Bioprod Bioref

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The additional costs required for the pre‐treatment of lignocellulosic bio‐mass prior to enzymatic hydrolysis have limited the commercial implementation of lignocellulosic bio‐chemical production. The use of acidic mine drainage (AMD) water as an acid source for lignocellulosic pre‐treatment has recently been investigated. Large quantities of AMD in South Africa suggest that AMD can be obtained cheaply, thus reducing the cost and increasing the potential of lignocellulosic bio‐chemicals. Acidic mine drainage could undergo further remediation using sulfate‐reducing bacteria (SRB) so that the water is suitable for release. The feasibility of such a system could be greatly improved if this process were to be incorporated within a bio‐refinery, such that all fractions of the bio‐mass are used to produce multiple products. This paper investigates such a bio‐refinery system, and evaluates the different options based on the bio‐refinery complexity profile (BCP). Due to the abundance of grass in the regions where AMD is generated, this was found to be the most suitable feedstock. The most feasible bio‐refinery option was found to produce ethanol through fermentation of C6 sugars, although it is recommended that further investigation be conducted into additional high‐value bio‐chemicals from the C6 sugar platform. C5 sugars released in pre‐treatment could be used as a substrate by SRB for AMD remediation. Gasification and direct combustion of lignin had similar BCPs and thus further investigation is required to determine the preferred path. Similarly, further investigation is required for the best processing route for distillery silage. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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- Synthetic Biology: A Promising Technology for Biofuel Production

Cited by 21 publications

References 104 publications

Strengths, challenges, and opportunities for hydrothermal pretreatment in lignocellulosic biorefineries

Strengths, challenges, and opportunities for hydrothermal pretreatment in lignocellulosic biorefineries

Effect of combined inorganic with organic acids pretreatment of rice straw on its structure properties and enzymatic hydrolysis

Evaluation of a combined lignocellulosic / waste water bio‐refinery for the simultaneous production of valuable biochemical products and the remediation of acid mine drainage

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