Effects of preheating on briquetting and subsequent hydrothermal pretreatment for enzymatic saccharification of wheat straw
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Effects of preheating on briquetting and subsequent hydrothermal pretreatment for enzymatic saccharification of wheat straw. / Gong, Chunxiao; Thomsen, Sune Tjalfe; Thygesen, Lisbeth G.; Felby, Claus.
In: Biotechnology Progress, Vol. 35, No. 4, e2808, 2019.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Effects of preheating on briquetting and subsequent hydrothermal pretreatment for enzymatic saccharification of wheat straw
AU - Gong, Chunxiao
AU - Thomsen, Sune Tjalfe
AU - Thygesen, Lisbeth G.
AU - Felby, Claus
PY - 2019
Y1 - 2019
N2 - Briquetting of plant biomass with low bulk density is an advantage for handling, transport, and storage of the material, and heating of the biomass prior to the briquetting facilitates the densification process and improves the physical properties of the briquettes. This study investigates the effects of preheating prior to briquetting of wheat straw (WS) on subsequent hydrothermal pretreatment and enzymatic conversion to fermentable sugars. WS (11% moisture content) was densified to briquettes under different conditions; without preheating or with preheating at 75 or 125°C for either 5 or 10 min. Subsequent hydrothermal pretreatment was done for both un-briquetted WS and for briquettes. Enzymatic saccharification was afterwards performed for all samples. The results showed that as expected, nonpretreated WS briquettes gave very low sugar yields (22–29% of the cellulose content), even though preheating at 125°C prior to briquetting (without pretreatment) improved sugar yields somewhat. When combined with pretreatment, briquetting with preheating showed neutral or negative effects on sugar yield. This result suggests that moderate preheating (75°C for 5 min) before briquetting improved bulk density and compressive resistance of briquettes without impeding subsequent enzymatic conversion. However, excessive preheating (75 or 125°C for 10 min) before briquetting may result in irreversible structural modifications that hinder the interaction between biomass and water during pretreatment, thereby decreasing the accessibility of cellulose to enzymatic saccharification.
AB - Briquetting of plant biomass with low bulk density is an advantage for handling, transport, and storage of the material, and heating of the biomass prior to the briquetting facilitates the densification process and improves the physical properties of the briquettes. This study investigates the effects of preheating prior to briquetting of wheat straw (WS) on subsequent hydrothermal pretreatment and enzymatic conversion to fermentable sugars. WS (11% moisture content) was densified to briquettes under different conditions; without preheating or with preheating at 75 or 125°C for either 5 or 10 min. Subsequent hydrothermal pretreatment was done for both un-briquetted WS and for briquettes. Enzymatic saccharification was afterwards performed for all samples. The results showed that as expected, nonpretreated WS briquettes gave very low sugar yields (22–29% of the cellulose content), even though preheating at 125°C prior to briquetting (without pretreatment) improved sugar yields somewhat. When combined with pretreatment, briquetting with preheating showed neutral or negative effects on sugar yield. This result suggests that moderate preheating (75°C for 5 min) before briquetting improved bulk density and compressive resistance of briquettes without impeding subsequent enzymatic conversion. However, excessive preheating (75 or 125°C for 10 min) before briquetting may result in irreversible structural modifications that hinder the interaction between biomass and water during pretreatment, thereby decreasing the accessibility of cellulose to enzymatic saccharification.
KW - bioethanol
KW - briquetting
KW - hydrothermal pretreatment
KW - preheating
KW - wheat straw
U2 - 10.1002/btpr.2808
DO - 10.1002/btpr.2808
M3 - Journal article
C2 - 30891956
AN - SCOPUS:85063576174
VL - 35
JO - Biotechnology Progress
JF - Biotechnology Progress
SN - 8756-7938
IS - 4
M1 - e2808
ER -
ID: 224810269