Effects of preheating on briquetting and subsequent hydrothermal pretreatment for enzymatic saccharification of wheat straw
- 19 March 2019
- journal article
- research article
- Published by Wiley in Biotechnology Progress
- Vol. 35 (4), e2808
- https://doi.org/10.1002/btpr.2808
Abstract
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 on subsequent hydrothermal pretreatment and enzymatic conversion to fermentable sugars. Wheat straw (11% moisture content) was densified to briquettes under different conditions; without preheating or with preheating at 75°C or 125°C for either 5 or 10 min. Subsequent hydrothermal pretreatment was done for both un‐briquetted wheat straw and for briquettes. Enzymatic saccharification was afterwards performed for all samples. The results showed that as expected, non‐pretreated wheat straw 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°C 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.Keywords
Funding Information
- Energistyrelsen
- China Sponsorship Council
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