首页|REMOVAL OF HEAVY METALS AND UPGRADING CRUDE BIO-OIL FROM PTERIS VITTATA STEMS AND LEAVES HARVEST USING HYDROTHERMAL UPGRADING PROCESS
REMOVAL OF HEAVY METALS AND UPGRADING CRUDE BIO-OIL FROM PTERIS VITTATA STEMS AND LEAVES HARVEST USING HYDROTHERMAL UPGRADING PROCESS
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NETL
Hyperaccumulator biomass harvested after heavy-metal phytoremediation must be considered as hazardous waste that should be contained or treated appropriately before disposal or reuse。 As a potential method to detoxify the biomass and to convert this material to a suitable bio-energy resource， the hydrothermal upgrading process was applied to remove heavy metals and upgrading crude bio-oil from Pteris vittata stems and leaves harvest。 Parameters such as material granularity， temperature， Liquid/Solid (L/S， ml/g)， pressure， duration and catalysts were examined for their effect on the removal efficiency of heavy metals and upgrading efficiency of crude bio-oil。 Maximum heavy metal removal efficiency of ＞99% and crude bio-oil upgrading efficiency of 83% were attained with an 200 mesh (75 μm) granularity， L/S 40:1 and 23 MPa at 380℃ in the presence of 0。1 mol L~(-1) K_2CO_3 for 30 min。 GC-MS analysis results show that the resulting bio-oil mainly consists of benzene 11%， ketone 42%， alcohols 14%， alkene 15% and ester 11%， etc。， and the relative molecular weight distribution lies in 94～282， carbon number distribution lies in 6～18， calorific value is 32 MJ kg~(-1)。
Pteris vittataHeavy metals hyperaccumulatorHydrothermal upgrading process
Yang Jian-guang、Deng Zi-xiang、Li Jun-yuan、Zhang Xu-liang
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Department of Metallurgy and Environment, Central South University, Changsha, 410083, China
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