On the use of an adsorption model to represent the effect of steam explosion pretreatment on the enzymatic hydrolysis of lignocellulosic substances

Pressure, temperature, and retention time are the most studied parameters in steam explosion pretreatment. However, this work aimed to fix these parameters and to evaluate the influences of several less investigated steam explosion parameters on the saccharification yield in hydrolysis. In this study, firstly, pinewood samples smaller than 200 µm were treated with steam explosion at 190 °C for 10 min. The variable parameters were biomass loading, N2 pressure, and release time. Steam-exploded samples were hydrolyzed with the Trichoderma reesei enzyme for saccharification for 72 h. The sugar content of the resultant products was analyzed to estimate the yield of sugars (such as glucose, xylose, galactose, mannose, and arabinose). The best glucose yield in the pulp was achieved with 4 g of sample, N2 pressure of 0.44 MPa, and short release time (22 s). These conditions gave a glucose yield of 97.72% in the pulp, and the xylose, mannose, galactose, and arabinose yields in the liquid fraction were found to be 85.59%, 87.76%, 86.43%, and 90.3%, respectively.

Download Full-text

Effect of steam explosion pretreatment on treatment with Pleurotus ostreatus for the enzymatic hydrolysis of rice straw

Journal of Bioscience and Bioengineering ◽

10.1016/j.jbiosc.2010.04.014 ◽

2010 ◽

Vol 110 (4) ◽

pp. 449-452 ◽

Cited By ~ 30

Author(s):

Masayuki Taniguchi ◽

Daisuke Takahashi ◽

Daisuke Watanabe ◽

Kenji Sakai ◽

Kazuhiro Hoshino ◽

...

Keyword(s):

Enzymatic Hydrolysis ◽

Rice Straw ◽

Pleurotus Ostreatus ◽

Steam Explosion ◽

Steam Explosion Pretreatment ◽

Hydrolysis Of

Download Full-text

Steam Explosion Pretreatment of Beechwood. Part 1: Comparison of the Enzymatic Hydrolysis of Washed Solids and Whole Pretreatment Slurry at Different Solid Loadings

Energies ◽

10.3390/en13143653 ◽

2020 ◽

Vol 13 (14) ◽

pp. 3653 ◽

Cited By ~ 1

Author(s):

Robert Balan ◽

Andrzej Antczak ◽

Simone Brethauer ◽

Tomasz Zielenkiewicz ◽

Michael H. Studer

Keyword(s):

Enzymatic Hydrolysis ◽

Lignocellulosic Biomass ◽

Steam Explosion ◽

Optimization Procedure ◽

Reaction Conditions ◽

Steam Explosion Pretreatment ◽

Pretreatment Temperature ◽

Pretreatment Conditions ◽

Whole Slurry ◽

Hydrolysis Of

Steam explosion is a well-known process to pretreat lignocellulosic biomass in order to enhance sugar yields in enzymatic hydrolysis, but pretreatment conditions have to be optimized individually for each material. In this study, we investigated how the results of a pretreatment optimization procedure are influenced by the chosen reaction conditions in the enzymatic hydrolysis. Beechwood was pretreated by steam explosion and the resulting biomass was subjected to enzymatic hydrolysis at glucan loadings of 1% and 5% employing either washed solids or the whole pretreatment slurry. For enzymatic hydrolysis in both reaction modes at a glucan loading of 1%, the glucose yields markedly increased with increasing severity and with increasing pretreatment temperature at identical severities and maximal values were reached at a pretreatment temperature of 230 °C. However, the optimal severity was 5.0 for washed solids enzymatic hydrolysis, but only 4.75 for whole slurry enzymatic hydrolysis. When the glucan loading was increased to 5%, glucose yields hardly increased for pretreatment temperatures between 210 and 230 °C at a given severity, and a pretreatment temperature of 220 °C was sufficient under these conditions. Consequently, it is important to precisely choose the desired conditions of the enzymatic hydrolysis reaction, when aiming to optimize the pretreatment conditions for a certain biomass.

Download Full-text

Steam explosion pretreatment and enzymatic hydrolysis of eucalyptus wood

Bioresource Technology ◽

10.1016/0960-8524(96)00019-3 ◽

1996 ◽

Vol 57 (2) ◽

pp. 107-110 ◽

Cited By ~ 27

Author(s):

A Nunes

Keyword(s):

Enzymatic Hydrolysis ◽

Steam Explosion ◽

Steam Explosion Pretreatment ◽

Eucalyptus Wood ◽

Hydrolysis Of

Download Full-text

Combination of steam explosion pretreatment and anaerobic alkalization treatment to improve enzymatic hydrolysis of Hippophae rhamnoides

Bioresource Technology ◽

10.1016/j.biortech.2019.121693 ◽

2019 ◽

Vol 289 ◽

pp. 121693 ◽

Cited By ~ 5

Author(s):

Liwen He ◽

Cheng Wang ◽

Honghui Shi ◽

Wei Zhou ◽

Qing Zhang ◽

...

Keyword(s):

Enzymatic Hydrolysis ◽

Steam Explosion ◽

Hippophae Rhamnoides ◽

Hippophaë Rhamnoides ◽

Steam Explosion Pretreatment ◽

Hydrolysis Of

Download Full-text

Steam Explosion Pretreatment of Beechwood. Part 2: Quantification of Cellulase Inhibitors and Their Effect on Avicel Hydrolysis

Energies ◽

10.3390/en13143638 ◽

2020 ◽

Vol 13 (14) ◽

pp. 3638

Author(s):

Simone Brethauer ◽

Andrzej Antczak ◽

Robert Balan ◽

Tomasz Zielenkiewicz ◽

Michael H. Studer

Keyword(s):

Acetic Acid ◽

Enzymatic Hydrolysis ◽

Steam Explosion ◽

Biomass Pretreatment ◽

Reaction Conditions ◽

Steam Explosion Pretreatment ◽

Wide Range ◽

Pretreatment Conditions ◽

Whole Slurry ◽

Hydrolysis Of

Biomass pretreatment is a mandatory step for the biochemical conversion of lignocellulose to chemicals. During pretreatment, soluble compounds are released into the prehydrolyzate that inhibit the enzymatic hydrolysis step. In this work, we investigated how the reaction conditions in steam explosion pretreatment of beechwood (severity: 3.0–5.25; temperature: 160–230 °C) influence the resulting amounts of different inhibitors. Furthermore, we quantified the extent of enzyme inhibition during enzymatic hydrolysis of Avicel in the presence of the prehydrolyzates. The amounts of phenolics, HMF, acetic acid and formic acid increased with increasing pretreatment severities and maximal quantities of 21.6, 8.3, 43.7 and 10.9 mg/gbeechwood, respectively, were measured at the highest severity. In contrast, the furfural concentration peaked at a temperature of 200 °C and a severity of 4.75. The presence of the prehydrolyzates in enzymatic hydrolysis of Avicel lowered the glucose yields by 5–26%. Mainly, the amount of phenolics and xylose and xylooligomers contributed to the reduced yield. As the maximal amounts of these two inhibitors can be found at different conditions, a wide range of pretreatment severities led to severely inhibiting prehydrolyzates. This study may provide guidelines when choosing optimal pretreatment conditions for whole slurry enzymatic hydrolysis.

Download Full-text