Hydrothermal treatment of wheat straw at pilot plant scale using a three-step reactor system aiming at high hemicellulose recovery, high cellulose digestibility and low lignin hydrolysis |
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Authors: | Thomsen Mette Hedegaard Thygesen Anders Thomsen Anne Belinda |
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Institution: | Biosystems Department, Ris? National Laboratory, Technical University of Denmark P.O. Box 49, DK-4000 Roskilde, Denmark. |
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Abstract: | A pilot plant (IBUS) consisting of three reactors was used for hydrothermal treatment of wheat straw (120-150 kg/h) aiming at co-production of bioethanol (from sugars) and electricity (from lignin). The first reactor step was pre-soaking at 80 degrees C, the second extraction of hemicellulose at 170-180 degrees C and the third improvement of the enzymatic cellulose convertibility at 195 degrees C. Water added to the third reactor passed countercurrent to straw. The highest water addition (600 kg/h) gave the highest hemicellulose recovery (83%). With no water addition xylose degradation occurred resulting in low hemicellulose recovery (33%) but also in high glucose yield in the enzymatic hydrolysis (72 g/100g glucose in straw). Under these conditions most of the lignin was retained in the fibre fraction, which resulted in a lignin rich residue with high combustion energy (up to 31 MJ/kg) after enzymatic hydrolysis of cellulose and hemicellulose. |
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