Production factors controlling the physical characteristics of biochar derived from phytoremediation willow for agricultural applications

Ashleigh Fletcher, Malcolm Smith, Andreas Heinemeyer, Richard Lord, Chris Ennis, Edward Hodgson, Kerry Farrar

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Willow, a leading bioenergy feedstock, may be planted for bioremediation and has been used, more recently, as the biomass feedstock in the manufacture of biochar for agricultural applications. Here, we present a detailed study of the physical and chemical factors affecting willow char properties, where the feedstock is a by-product of bioremediation, potentially transferring pollutants such as heavy metals to the wood feed. Biochar samples were produced via pyrolysis of short-rotation coppice willow, grown on contaminated land, using several treatment times at heat treatment temperatures (HTTs) in the range 350–650 °C, under a constant flow of argon, set at either 100 or 500 mL.min−1. The samples were analysed for yield, elemental analysis and structural characteristics, including surface area and pore size distribution, surface functionality and metal content. All chars obtained
have high fixed carbon contents but vary in surface characteristics with a marked increase in basic character with increasing HTT, ascribed to the removal of surface oxygen moieties. Results indicate a minimum pyrolysis temperature of 450 °C is required to produce a defined mesoporous structure, as required to facilitate oxygen transport, HTT≥550 °C produces total surface area of >170 m2.g−1 and, more importantly, an appreciable external surface area suitable for microbial colonisation. The data show that selection and optimisation of char properties is possible; however, the interplay of factors may mean some compromise is required.
LanguageEnglish
Pages371-380
Number of pages10
JournalBioEnergy Research
Volume7
Issue number1
Early online date29 Sep 2013
DOIs
Publication statusPublished - 1 Mar 2014

Fingerprint

biochar
production economics
phytoremediation
Agriculture
feedstocks
surface area
bioremediation
pyrolysis
heat treatment
Feedstocks
temperature
Bioremediation
Heat treatment
microbial colonization
oxygen
Pyrolysis
bioenergy
Temperature
manufacturing
heavy metals

Keywords

  • heavy metals
  • surface texture
  • biomass
  • pyrolysis
  • carbon sequestration
  • energy crop

Cite this

Fletcher, Ashleigh ; Smith, Malcolm ; Heinemeyer, Andreas ; Lord, Richard ; Ennis, Chris ; Hodgson, Edward ; Farrar, Kerry. / Production factors controlling the physical characteristics of biochar derived from phytoremediation willow for agricultural applications. In: BioEnergy Research. 2014 ; Vol. 7, No. 1. pp. 371-380.
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Production factors controlling the physical characteristics of biochar derived from phytoremediation willow for agricultural applications. / Fletcher, Ashleigh; Smith, Malcolm ; Heinemeyer, Andreas; Lord, Richard; Ennis, Chris; Hodgson, Edward; Farrar, Kerry.

In: BioEnergy Research, Vol. 7, No. 1, 01.03.2014, p. 371-380.

Research output: Contribution to journalArticle

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AU - Farrar, Kerry

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