Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Effect of the Growth Period on Bioethanol Production from the Branches of Woody Crops Cultivated in Short-rotation Coppices

  • Jo, Jong-Soo (Department of Interior Materials Engineering, Gyeongnam National University of Science and Technology) ;
  • Jung, Ji Young (Division of Environmental Forest Science and Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Yang, Jae-Kyung (Division of Environmental Forest Science and Institute of Agriculture & Life Science, Gyeongsang National University)
  • Received : 2019.03.18
  • Accepted : 2019.05.13
  • Published : 2019.05.25
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Abstract

Woody crops cultivated in short-rotation coppices are attractive sources of lignocellulosic materials for bioethanol production, since they are some of the most abundant renewable resources. In this study, we evaluated the effects of the growth period on bioethanol production using short-rotation woody crops (Populus nigra ${\times}$ Populus maxiwiczii, Populus euramericana, Populus alba ${\times}$ Populus glandulosa, and Salix alba). The carbohydrate contents of 3-year-old and 12-year-old short-rotation woody crop branches were 62.1-68.5% and 64.0-67.1%, respectively. The chemical compositions of 3-year-old and 12-year-old short-rotation woody crop branches did not vary significantly depending upon the growth period. However, the 3-year-old short-rotation woody crop branches (glucose conversion: 26-40%) were hydrolyzed more easily than their 12-year-old counterparts (glucose conversion: 19-24%). Furthermore, following the fermentation of enzymatic hydrolysates from the crop branch samples (by Saccharomyces cerevisiae KCTC 7296) to ethanol, the ethanol concentration of short rotation coppice woody crops was found to be higher in the 3-year-old branch samples (~ 0.18 g/g dry matter) than in the 12-year-old branch samples (~ 0.14 g/g dry matter). These results suggest that immature wood (3-year-old branches) from short-rotation woody crops could be a promising feedstock for bioethanol production.

Keywords

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Fig. 1. Woody crops cultivated in short-rotation coppices. (a) 3-year-old P. nigra × P. maxiwiczii branch, (b) 3-year-old P. euramericana branch, (c) 3-year-old P. alba × P. glandulosa branch, (d) 3-year-old S. alba branch, (e) 12-year-old P. nigra × P. maxiwiczii branch, (f) 12-year-old P. euramericana branch, (g) 12-year-old P. alba × P. glandulosa branch, (h) 12-year-old S. alba branch.

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Fig. 2. Effects of crop growth periods on glucose conversion in 3-year-old and 12-year-old P. nigra × P. maxiwiczii, P. euramericana, P. alba × P. glandulosa, and S. alba branches. Enzymatic hydrolysis conditions: Cellulase (65 FPU/g), β-glucosidase (24 CBU/g), pH 4.8, 50℃, 150 rpm, 96 hours. The data are expressed as the mean ± SD (n = 3).

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Fig. 3. Fermentation kinetics during ethanol production from P. nigra× P. maxiwiczii branches by S. cerevisiae KCTC 7296 using batch fermentation. (a) 3-year-old P. nigra× P. maxiwiczii branches, (b) 12-year-old P. nigra× P. maxiwiczii branches. The data are expressed as the mean ± SD (n = 3).

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Fig. 4. Fermentation kinetics during ethanol production from P. euramericana by S. cerevisiae KCTC 7296 using batch fermentation. (a) 3-year-old P. euramericana branches, (b) 12-year-old P. euramericana branches. The data are expressed as the mean ± SD (n = 3).

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Fig. 5. Fermentation kinetics during ethanol production from P. alba × P. glandulosa by S. cerevisiae KCTC 7296 using batch fermentation. (a) 3-year-old P. alba × P. glandulosa branches, (b) 12-year-old P. alba × P. glandulosa branches. The data are expressed as the mean ± SD (n = 3).

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Fig. 6. Fermentation kinetics during ethanol production from S. alba by S. cerevisiae KCTC 7296 using batch fermentation. (a) 3-year-old S. alba branches, (b) 12-year-old S. alba branches. The data are expressed as the mean ± SD (n = 3).

Table 1. Chemical compositions of 3-year-old and 12-year-old woody crop branchesa

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