The process allows for exceptionally high glucose yields from enzymatic conversion, especially if the scavenger is added by impregnation, and outperforms every process in the total glucose yield. Authors contributing to RSC publications (journal articles, books or book chapters) Comparison of SO2 and H2SO4 impregnation of softwood prior to steam pretreatment on ethanol production. b Steam explosion pretreatment with admixed 2-naphthol, carried out with and without explosive decompression. 0 = 5.3). Digestibility is expressed as glucose yield of pretreated biomass content. Bioresour Technol. It also exceeds the total sugar yield of most acid-catalyzed one-stage pretreatments and even reaches the total sugar yields of two-stage pretreatments. Burkhardt S, Kumar L, Chandra R, Saddler J. In contrast to adding the scavenger by mixing (compare Fig. This can be achieved by the addition of a carbocation scavenger that reacts with lignin carbocations, which are formed in the lignin polymer due to the acidic conditions created by the release of acidic hemicellulose side groups. The effect is particularly high at the lowest enzyme dosage of 15 FPU g−1 cellulose, where the digestibility could be enhanced by up to 179% relatively compared to the control (logR Söderström J, Pilcher L, Galbe M, Zacchi G. Two-step steam pretreatment of softwood with SO2 impregnation for ethanol production. Tomás-Pejó E, Alvira P, Ballesteros M, Negro MJ. Flavier, F.R.P. Golden: National Renewable Energy Laboratory; 2005. In: Zhu J, Zhang X, Pan X, editors. Golden: National Renewable Energy Laboratory; 2008. In this respect, the resulting lignin from a scavenger process represents an interesting feedstock, owing to its lower and more uniform molecular weight, its low content in repolymerized aromatic C–C bonds, and an increased aromatic functionality due to the integration of the aromatic scavenger into the lignin structure [20]. Héctor A. Ruiz, Marc Conrad, Shao-Ni Sun, Arturo Sanchez, George J.M. The approach allows for remarkably high glucose yields in enzymatic hydrolysis without using harsh acids or removing lignin from the biomass. Steam explosion pretreatment. 0 = 5.3). Fundamental factors affecting enzymatic hydrolysis of lignocellulosic biomass. 2003;24:475–86. 2005;96:673–86. Chornet E, Overend RP. The evaporation of the acetone and ethanol impregnation solution lasted 1 and 3 days, respectively. Li-Mei Qie, Zeng-Yu Yao, Guo-Wei Li, Sang-Bin Xie, Qi Yang, Jian-Hua Qi. Corresponding authors, a Pilot-scale steam explosion pretreatment with 2-naphthol to overcome high softwood recalcitrance. You have to login with your ACS ID befor you can login with your Mendeley account. 2-Naphthol has a very low water solubility of 0.75 g l−1 at 25 °C, which increases however exponentially with rising temperature [41]. 2010;101:4992–5002. A ball valve at the bottom of the reactor allows for the discharge of the biomass into the blow tank. It has already been observed, though, that intense lignin repolymerization may also shield the cellulose from enzymatic attack, which can be prevented by the use of a scavenger [40]. In the overall process cost of a scavenger process, the 2-naphthol additive ranked third after biomass and enzymes. 4c, d) nor on the pH of the pretreatment liquor (Additional file 1: Figure S1). 2010;44:173. Jérémie Damay, Iulian-Zoltan Boboescu, Xavier Duret, Olivier Lalonde, Jean-Michel Lavoie. The moisture content of the biomass alone would be sufficient for dissolving all added 2-naphthol at a temperature of 127 °C,Footnote 1 showing that the experiments at 235 °C were carried out well above the solubility limit of 2-naphthol. Bioresour Technol. You’ve supercharged your research process with ACS and Mendeley! 4c). 2-Naphthol solubility 43 g l−1, exponential interpolation of data from Moyle et al. Assessment of pretreatment effects on anaerobic digestion of switchgrass: Economics-energy-environment (3E) analysis. Appl Biochem Biotechnol. The suitability of other solvents is however of interest, too. Comparative evaluation of lignocellulosic biorefinery scenarios under a life-cycle assessment approach. This perception is supported by the observation that in experiments without explosion, the enzyme dosage did practically not influence glucose yields. Sluiter A, Ruiz R, Scarlata C, Sluiter J, Templeton D. NREL/TP-510-42619. P.V. Biochem Eng J. Ethanol production from residual lignocellulosic fibers generated through the steam treatment of whole sorghum biomass. Please note: If you switch to a different device, you may be asked to login again with only your ACS ID. Guillaume Maniet, Quentin Schmetz, Nicolas Jacquet, Michaël Temmerman, Sébastien Gofflot, Aurore Richel. steam explosion pretreatment reduced cellulose DP to level off values (LODP), which is. statement and Hongqiang Li, Yongshui Qu, Yongqing Yang, Senlin Chang, Jian Xu. This is in particular true for the two-stage treatments, which dissolve up to 57% cellulose (compare Table 2). b Steam explosion pretreatment without additive (control) and with 2-naphthol impregnation using ethanol as solvent. For a better comparability of the different processes with additive, their glucose yields obtained in enzymatic hydrolysis and their total sugar yield are shown as a function of the used enzyme dosage in Fig. Cookies policy. It is further interesting to note that the acid-catalyzed pretreatment studies show a—sometimes dramatical—decrease of cellulose digestibility for high pretreatment severities [48, 50,51,52]. Zhenyong Miao, Mingqiang Gao, Keji Wan, Zhen Pei, Qiongqiong He, Pengchao Ji. 2002;98:5–21. Results are shown for different pretreatment severities (logR Sara Bello, Carmen Ríos, Gumersindo Feijoo, María Teresa Moreira. Although the processing of lignocellulosic biomass is more challenging, continuous improvements of its biochemical conversion have recently allowed the first commercial plants to enter production [3]. Energy requirements for the size reduction of poplar and aspen wood. Such a solvent should therefore not interfere with the downstream processing even if not completely removed from the biomass before pretreatment, which however was not the case in this study. After a pretreatment time of 2.5, 5, 10 or 20 min, the biomass was exploded/discharged into the blow tank. Steam Explosion as a Pretreatment of Cynara cardunculus Prior to Delignification. A sieving analysis of the pretreated biomass showed that the 2-naphthol did not have any influence on the particle size of the exploded biomass (results not shown). Woody raw materials offer flexible harvesting times, moderate transportation costs due to their high density and have a very low ash content compared to other types of lignocellulosic biomass, which facilitates their biochemical processing [5, 8]. Assessment on temperature-pressure severally controlled explosion pretreatment of poplar. of Energy; 2005. In one experimental set, 2-naphthol was added by blending the wood chips with the 2-naphthol flakes (≤0.5 mm). Microwave irradiation – A green and efficient way to pretreat biomass. Cellul Chem Technol. Glucose,EH sample is the mass of glucose released during the enzymatic hydrolysis experiment and m Sugar yields in pretreatment liquor (a, b) and biomass composition (c, d) after steam explosion pretreatments without additive and with 2-naphthol addition by mixing and impregnation. The solvent was then allowed to evaporate at room temperature in a vented fume hood with frequent mixing to assure even impregnation. In average, 91.5% of the cellulose was recovered after pretreatment and the highest severity (logR Woody biomass pretreatment for cellulosic ethanol production: technology and energy consumption evaluation. Steam explosion pretreatment of softwood: the effect of the explosive decompression on enzymatic digestibility. contained in this article in third party publications Finding a method for reducing the high softwood recalcitrance via cost-effective pretreatment methods would therefore be of great benefit. Methods of modification. Accellerase 1500 (Genencor; lot number 4901298419), with an activity of 26 filter paper units (FPU) ml−1 measured according to the NREL method [37] was used with final concentrations of 15, 30, and 60 FPU g−1 cellulose in the sample preparation. Therefore, softwood is currently processed only via thermochemical technologies on a commercial scale [3], where its recalcitrance to biological processing does not play a role. Biomass Pretreatment with the Szego Mill™ for Bioethanol and Biogas Production. Additional file containing the Figure S1 and Tables S1–S2 is available online. By using this website, you agree to our Acid-catalyzed steam explosion is the most common steam pretreatment for woody biomass [5] and has been described as the most suitable method for softwood in a review by Galbe and Zacchi [11]. Steam explosion is a thermo-mechanicochemical pretreatment which allows the breakdown of lignocellulosic structural components by the action of heating, formation of organic acids during the process, and shearing forces resulting in the expansion of the moisture. Ida Aarum, Hanne Devle, Dag Ekeberg, Svein J. Horn. Furthermore, SE showed potential in improving the antiproliferative activity of the total phenolic extract against Caco-2 cells as well as the bound phenolic extract against HepG2 cells in vitro. Cite this article. Industrial & Engineering Chemistry Research. An overview of the experimental conditions and pretreatment severities is shown in Table 1. Further development of the approach should focus on the optimization of the scavenger addition method and the implementation in a two-stage pretreatment. Spruce wood chips were prepared from a roughly 30-year-old tree, cut in summer 2014 in Biberist (canton of Solothurn, Switzerland) by chopping through a 30-mm screen. Efforts to implement a two-stage pretreatment should allow for exceptionally high total sugar yields from softwood. mingjian1972@163.com, food_mj@swu.edu.cn Your Mendeley pairing has expired. Biotechnol Biofuels. It therefore offers the possibility of obtaining high sugar yields from softwood in a simplified biorefinery concept. At the highest severity of logR In all cases the Ref. Pretreatment conditions: T = 235 °C, t = 2.5–20 min, Δp explosion = 30 bar, 1.5 kg wood chips, 35.36 g 2-naphthol; hydrolysis conditions: 1% w/w cellulose, 15/30/60 FPU g−1 cellulose. Fast and efficient alkaline peroxide treatment to enhance the enzymatic digestibility of steam-exploded softwood substrates. It is pointed out that the scavenger process does not remove lignin from the biomass and increases the biomass digestibility in that way. of the whole article in a thesis or dissertation. where t is the pretreatment time in minutes and T the pretreatment temperature in degrees Celsius [30]. Ida Aarum, Anders Solli, Hördur Gunnarsson, Dayanand Kalyani, Hanne Devle, Dag Ekeberg, Yngve Stenstrøm. 2015;69:572–81. Glucose,Pretreatment liquor is the mass of glucose in the recovered pretreatment liquor. Article  Zhu JY, Pan XJ. Producing biofuels via the sugar platform. Hu F, Ragauskas A. Pretreatment and lignocellulosic chemistry.

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