Effects of pretreatment conditions and post–pretreatment washing on ethanol production from dilute acid pretreated rice straw

Lee, Christopher; Zheng, Yi; VanderGheynst, Jean S.

doi:10.1016/j.biosystemseng.2015.07.001

Cited by 31 publications

(7 citation statements)

References 22 publications

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“…Dilute acid treatment is one of the most widely used methods for lignocellulosic biomass (Kumar et al 2009). Monomeric sugars (glucose, xylose and arabinose) can be obtained after exposing the biomass to harsh physicochemical conditions of dilute acid treatment (Lee et al 2015). In this study, rice straw was hydrolysed by dilute sulphuric acid and high pressure steam.…”

Section: Analysis Of Rice Straw Hydrolysatementioning

confidence: 99%

Improving probiotic spore yield using rice straw hydrolysate

Yin

Chen

Zeng

et al. 2020

Lett Appl Microbiol

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Spore‐forming Bacillus sp. has been extensively studied for their probiotic properties. In this study, an acid‐treated rice straw hydrolysate was used as carbon source to produce the spores of Bacillus coagulans. The results showed that this hydrolysate significantly improved the spore yield compared with other carbon sources such as glucose. Three significant medium components including rice straw hydrolysate, MnSO4 and yeast extract were screened by Plackett–Burman design. These significant variables were further optimized by response surface methodology (RSM). The optimal values of the medium components were rice straw hydolysate of 27% (v/v), MnSO4 of 0·78 g l−1 and yeast extract of 1·2 g l−1. The optimized medium and RSM model for spore production were validated in a 5 l bioreactor. Overall, this sporulation medium containing acid‐treated rice straw hydrolysate has a potential to be used in the production of B. coagulans spores.

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Section: Analysis Of Rice Straw Hydrolysatementioning

confidence: 99%

Improving probiotic spore yield using rice straw hydrolysate

Yin

Chen

Zeng

et al. 2020

Lett Appl Microbiol

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“…To address the challenge of biomass recalcitrance, many research groups have made significant advances during the past three decades. Tremendous pretreatment technologies have been developed to render carbohydrates (cellulose and hemicellulose) more amenable to enzymatic and microbial attacks. − Although the resultant biomass is efficiently accessible to enzymes with high ethanol conversion yield, it can be observed that the pretreated biomass is often separated from the liquid fraction and then subjected to excessive water washing. − The resultant liquid fraction is generally discarded as wastewater. , This common process inevitably results in large amounts of water consumption, wastewater generation, and chemical loss. The reason for postwashing and wastewater discarding can be attributed to the inhibitory compounds (furans, phenols, and residual chemical reagents). − However, furans are high-value platform molecules that can be catalyzed to fuels and a wide assortment of chemicals. − To recover the furans from the aqueous phase, various organic extraction solvents such as methyl isobutyl ketone, dichloromethane, toluene, and tetrahydrofuran have been investigated. − Moreover, lignin has the potential to be used as a starting material for the production of value-added polymeric materials and chemicals. , In this regard, LignoBoost, LignoForce, and aqueous lignin purification with acetic acid (HOAc) or ethanol solvent have been developed to recover raw bulk lignin from alkaline black-liquor byproducts. − In our previous studies, integrating HOAc and sodium hydroxide (NaOH) pretreated biomass and their mixed filtrate for enzymatic hydrolysis has been demonstrated to minimize water and chemical consumption. , Moreover, the direct combination of HOAc and NaOH pretreated filtrates was able to precipitate lignin and boost sugar concentration. , Therefore, it is worth exploring whether integrating sulfuric acid (H 2 SO 4 ) and NaOH pretreatments can achieve better results than conventional H 2 SO 4 pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Technoeconomic Analysis of Multiple-Stream Ethanol and Lignin Production from Lignocellulosic Biomass: Insights into the Chemical Selection and Process Integration

Zhao

Weiß

Wang

2021

ACS Sustainable Chem. Eng.

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Technoeconomic analysis of multiple-stream lignin and ethanol production from 100 Mt/h of industrial hemp biomass is conducted based on three scenarios: I, H2SO4 pretreatment and NaOH neutralization; II, parallel HOAc and NaOH pretreatments, solid separation, and liquid integration; and III, parallel H2SO4 and NaOH pretreatments, solid separation, and liquid integration. The technical and economic advantages and disadvantages of the three processing scenarios with different production technologies are discussed. A discounted cash flow rate of return assessment is executed to ascertain the ethanol minimum selling price (MSP). The chemical reagent used for pretreatment is found to have a significant impact on economic aspects with an annual operating cost of $628.34 million for scenario II, which is strikingly higher than $367.97 million for scenario I and $347.86 million for scenario III. The advantage of the largest lignin and ethanol output with a total revenue of $190.53 million annually for scenario II is offset by its high total capital investment and operating cost. Scenario III reaches the lowest ethanol MSP of $6.16/gal compared to $9.04/gal from scenario I and $10.26/gal from scenario II, indicating that parallel H2SO4 and NaOH pretreatments with subsequent integration are more efficient than a single H2SO4 pretreatment. Sensitivity analyses identify biomass and reagent costs and glucose-to-ethanol yield as the dominant contributors to the ethanol MSP. Although the present biorefineries are not profitable yet, this study might provide new perspectives for biomass valorization in terms of chemical selection and engineering design.

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“…Zhang et al found that increasing the H 2 O 2 loading during pretreatment led to the enhancement of substrate digestibility, whereas the alkali (only NaOH)-pretreated solid generated a higher glucose yield than that pretreated with autohydrolysis with a lower loading of H 2 O 2 [ 8 ]. The different reagents that were used to extract lignocellulose can significantly change its physical and chemical properties, for instance reducing the lignin content in the cell wall, changing the functional group of lignin, increasing or reducing the hydrophobicity, and changing the crystallinity of cellulose [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pretreatments on the Enzymatic Hydrolysis of High-Yield Bamboo Chemo-Mechanical Pulp by Changing the Surface Lignin Content

et al. 2021

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Hydrogen peroxide chemo-mechanical pulp (APMP), sulfonated chemo-mechanical pulp (SCMP), and chemical thermomechanical pulp (CTMP) were used as raw materials to explore the effects of hydrogen peroxide (HP), Fenton pretreatment (FP), and ethanol pretreatment (EP) on the enzymatic hydrolysis of high-yield bamboo mechanical pulp (HBMP). The surface lignin distribution and contents of different HBMPs were determined using confocal laser scanning microscopy (CLSM) and X-ray photoelectron spectroscopy (XPS). The correlation between the surface lignin and the enzymatic hydrolysis of HBMP was also investigated. The residue of enzymatic hydrolysis was used to adsorb methylene blue (MB). The results showed that the cracks and fine fibers on the surface of APMP, SCMP, and CTMP increased after FP, when compared to HP and EP. The total removal content of hemicellulose and lignin in SCMP after FP was higher than with HP and EP. Compared to SCMP, the crystallinity increased by 15.4%, and the surface lignin content of Fenton-pretreated SCMP decreased by 11.7%. The enzymatic hydrolysis efficiency of HBMP after FP was higher than with HP and EP. The highest enzymatic hydrolysis of Fenton-pretreated SCMP was 49.5%, which was higher than the enzymatic hydrolysis of Fenton-pretreated APMP and CTMP. The removal rate of MB reached 94.7% after the adsorption of the enzymatic hydrolysis residue of SCMP. This work provides an effective approach for a high value-added utilization of high-yield bamboo pulp.

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Effects of pretreatment conditions and post–pretreatment washing on ethanol production from dilute acid pretreated rice straw

Cited by 31 publications

References 22 publications

Improving probiotic spore yield using rice straw hydrolysate

Improving probiotic spore yield using rice straw hydrolysate

Technoeconomic Analysis of Multiple-Stream Ethanol and Lignin Production from Lignocellulosic Biomass: Insights into the Chemical Selection and Process Integration

Effect of Pretreatments on the Enzymatic Hydrolysis of High-Yield Bamboo Chemo-Mechanical Pulp by Changing the Surface Lignin Content

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