Slow pyrolysis of metal(loid)-rich biomass from phytoextraction

characterisation of biomass, biochar and bio-oil

Jing He*, Vladimir Strezov, Tao Kan, Haftom Weldekidan, Ravinder Kumar

*Corresponding author for this work

Research output: Contribution to journalConference paper

1 Citation (Scopus)
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Abstract

Plants have successfully been used for phytoextraction of metal contaminated soils, however the use of these plants for energy production has been a subject of debates due to the potential conversion of the metals in the plants into airborne respirable particles. The aim of this study was to investigate the deportment of metal(loid)s during pyrolysis of a biomass cultivated in a highly contaminated soil in order to engineer best practice environmental approach for utilization of this biomass. A heavy metal(loid) contaminated mangrove (Avicennia marina var. australasica) biomass was used as a feedstock in this study. The biomass was subjected to slow pyrolysis under the heating rate of 60 ℃/min and different pyrolysis temperatures. Inductively coupled plasma mass spectrometry, thermogravimetric analysis, Fourier-transform infrared spectroscopy, X-ray fluorescence spectroscopy and gas chromatography–mass spectrometry were introduced to characterise the biomass, biochar and bio-oil samples. Results showed that biochar yield decreased from 57.4 % to 35.3 % with the increase in pyrolysis temperature from 300 to 700 ℃. Heavy metal(loid)s (chromium, manganese, iron, copper, zinc, arsenic and lead) were mainly bound in the biochar produced at 300 ℃, while the recovery decreased substantially with the increase of pyrolysis temperature. Phenols, carboxylic acids and alcohols were the dominant compounds in all bio-oil samples. This study suggested further requirements of biochar quality and environmental risk assessment to provide a safe and value-added way of phytoextraction residual applications.

Original languageEnglish
Pages (from-to)178-185
Number of pages8
JournalEnergy Procedia
Volume160
DOIs
Publication statusPublished - Feb 2019
Event2nd International Conference on Energy and Power, ICEP2018 - Sydney, Australia
Duration: 13 Dec 201815 Dec 2018

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Copyright the Author(s) 2019. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • Bio-oil
  • Biochar
  • Heavy metals
  • Pyrolysis
  • Temperature

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