The effect of direct and counter-current flow-through delignification on enzymatic hydrolysis of wheat straw, and flow limits due to compressibility

Ville Pihlajaniemi (Corresponding Author), Mika Sipponen, Ossi Pastinen, Antti Nyyssölä, Simo Laakso

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

This article compares the processes for wheat straw lignocellulose fractionation by percolation, counter‐current progressing batch percolation and batch reaction at low NaOH‐loadings (3–6% of DM). The flow‐through processes were found to improve delignification and subsequent enzymatic saccharification, reduce NaOH‐consumption and allow reduction of thermal severity, whereas hemicellulose dissolution was unaffected. However, contrary to previous expectations, a counter‐current process did not provide additional benefits to regular percolation. The compressibility and flow properties of a straw bed were determined and used for simulation of the packing density profile and dynamic pressure in an industrial scale column. After dissolution of 30% of the straw DM by delignification, a pressure drop above 100 kPa m−1 led to clogging of the flow due to compaction of straw. Accordingly, the maximum applicable feed pressure and volumetric straw throughput was determined as a function of column height, indicating that a 10 m column can be operated at a maximum feed pressure of 530 kPa, corresponding to an operation time of 50 min and a throughput of 163 kg m−3 h−1.
Original languageEnglish
Pages (from-to)2605-2613
JournalBiotechnology and Bioengineering
Volume113
Issue number12
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • compressibility
  • counter-current
  • delignification
  • flow-through
  • lignocellulose
  • percolation

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