Pyrolysis of heavy metal contaminated biomass pre-treated with ferric salts: product characterisation and heavy metal deportment

He, Jing, Strezov, Vladimir, Zhou, Xiaoteng, Kumar, Ravinder, and Kan, Tao (2020) Pyrolysis of heavy metal contaminated biomass pre-treated with ferric salts: product characterisation and heavy metal deportment. Bioresource Technology, 313. p. 123641.

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Abstract

The metal(loid)-enriched Avicennia marina biomass obtained from phytoremediation was impregnated with two ferric salts (FeCl3 and Fe(NO3)3) prior to pyrolysis at 300–700 °C, aiming to study the influence on pyrolytic product properties and heavy metal(loid) deportment. Results showed that the impregnated ferric salts increased the fixed carbon content of biochars, hydrocarbon fractions in bio-oils, and the evolution of CO and H2 in gases. Cd in biomass could be effectively removed from the biomass by FeCl3 impregnation. During pyrolysis, the ferric salts enhanced the elemental recovery of As, Cr, Ni and Pb in the biochars and decreased their distribution in gases. Notably, the ferric salt pre-treatment inhibited the mobility and bio-availability of most elements in the biochars. This study indicated that ferric salt impregnation catalysed the pyrolysis process of metal(loid) contaminated biomass, enabled the operation temperature at 500–700 °C with minimal environmental risks, providing a safe and value-added way to the phytoremediation-pyrolysis scheme.

Item ID: 75016
Item Type: Article (Research - C1)
ISSN: 1873-2976
Keywords: Biomass, Ferric salt pre-treatment, Heavy metal, Leaching, Pyrolysis
Copyright Information: © 2020 Elsevier Ltd. All rights reserved.
Date Deposited: 02 Aug 2022 03:11
FoR Codes: 40 ENGINEERING > 4004 Chemical engineering > 400402 Chemical and thermal processes in energy and combustion @ 100%
SEO Codes: 17 ENERGY > 1708 Renewable energy > 170801 Biofuel energy @ 100%
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