Heavy metal removal and crude bio-oil upgrade from Sedum alfredii Hance harvest using hydrothermal upgrading

In this study, heavy metals were removed and crude bio-oil was yielded from a heavy metal hyperaccumulator harvest, Sedum alfredii Hance, through hydrothermal upgrading process. This paper reports on the optimization of process parameters for the removal of heavy metals (zinc, lead, and copper) and...

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Bibliographic Details
Published in:Journal of hazardous materials 2010-07, Vol.179 (1), p.1037-1041
Main Authors: Yang, Jian-guang, Tang, Chao-bo, He, Jing, Yang, Sheng-Hai, Tang, Mo-tang
Format: Article
Language:English
Subjects:
Applied sciences
Biofuels - analysis
Biomass
Derivatives
Exact sciences and technology
Gas Chromatography-Mass Spectrometry
Heavy metals
Hot Temperature
Hydrocarbons
Hydrothermal upgrading process
Hyperaccumulator
Legislation
Metals, Heavy - isolation & purification
Optimization
Other industrial wastes. Sewage sludge
Pollution
Pressure
Reproducibility of Results
Residues
Sedum - chemistry
Sedum alfredii
Sedum alfredii Hance
Solid phases
Temperature
Thermodynamics
Upgrading
Wastes
Water
Zinc
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Summary:In this study, heavy metals were removed and crude bio-oil was yielded from a heavy metal hyperaccumulator harvest, Sedum alfredii Hance, through hydrothermal upgrading process. This paper reports on the optimization of process parameters for the removal of heavy metals (zinc, lead, and copper) and for the upgrading of crude bio-oil from this biomass in an autoclave. Parameters such as granularity, temperature, pressure, and duration were examined for their effect on the removal efficiency of heavy metals and upgrading efficacy of crude bio-oil. Maximum heavy metal removal efficiency of >99% and crude bio-oil upgrading efficiency of >60% were attained with an 18 mesh (1 mm) granularity, and 22.1 MPa at 370 °C in the presence of 10 mg/L additives (K 2CO 3) for 60 s. Under these optimized conditions, an oil phase (mostly composed of phenolic hydrocarbons and derivatives), a water phase raffinate (containing Zn 2+ (0.39 g/L), Pb 2+ (0.10 g/L), Cu 2+ (0.15 g/L)), and a solid phase (the hydrothermal upgrading residue, which completely satisfies the limit set by China legislation related to biosolids disposal) were obtained.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2010.03.109