Impact of vegetation type and pre-processing on product yields and properties following hydrothermal conversion of conservation biomass

John Corton, Iain Donnison, Andrew Ross, Amanda Lea-Langton, Michael Wachendorf, Mariecia Fraser

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Abstract

Changes in agricultural practices and land abandonment across less favoured areas have led to an increase in land management for nature conservation. Substantial areas of vegetation are cut annually for habitat management, but the conservation biomass generated is generally discarded. Samples of two types of conservation biomass harvested from marginal sites dominated by rushes (Juncus spp) or bracken (Pteridium aquilinum) were washed and pressed to generate fluid and fibrous process streams using the Integrated Generation of Solid Fuel and Biogas from Biomass (IFBB) process. Previous work established the fluid from the IFBB process could be anaerobically digested to generate enough energy for the washing and pressing stages. The current study focussed on the fibrous process stream, subjecting material to hydrothermal conversion and investigated the extent to which i) vegetation type, ii) the impact of pre-treatment by hot water washing and pressing (partial demineralisation) and iii) hydrothermal conversion route (hydrothermal carbonisation or hydrothermal liquefaction) affected the yields, relative proportions, and characteristics of products generated. Feedstock source had substantially more effect on product chemistry than product yields. The most effective process route for combustion fuel production was based on hydrothermal carbonisation of pre-processed feedstock. However, if bio-oil production was to be the priority product in a biorefinery, then biomass pre-processing would not be required.
Original languageEnglish
Article number110462
Number of pages9
JournalRenewable and Sustainable Energy Reviews
Volume137
Early online date22 Oct 2020
DOIs
Publication statusPublished - 31 Mar 2021

Keywords

  • Bioenergy
  • Conservation biomass
  • Ecosystem services
  • Habitat management
  • Hydrothermal carbonisation
  • Hydrothermal liquefaction

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