Journal
WOOD RESEARCH
Volume 66, Issue 1, Pages 39-48Publisher
SLOVAK FOREST PRODUCTS RESEARCH INST
DOI: 10.37763/wr.1336-4561/66.1.3948
Keywords
Populus trichocarpa; poplar; steam explosion; liquid hot water; liquid fraction; heavy metals
Categories
Funding
- National Centre for Research and Development [BIOSTRATEG2/298241/10/NCBR/2016]
- Foundation for Polish Science
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The study examined the changes in concentration of selected heavy metals in Populus trichocarpa wood before and after steam explosion and liquid hot water pretreatments, finding that except for iron, the concentration of other elements changed minimally after pretreatment. During the pretreatment process, wood biomass absorbed iron emitted from the equipment at high temperatures.
The concentration of selected heavy metals: chromium (Cr), manganese (Mn), iron (Fe), nickel (Ni), copper (Cu) and zinc (Zn) in 5-year-old wood of Populus trichocarpa before and after steam explosion (SE) and liquid hot water (LHW) pretreatments was studied. The concentration of the above heavy metals in the liquid fraction obtained after pretreatments was also studied. The studied problem of heavy metals in lignocellulosic biomass is an interesting and important issue in the context of bioethanol production technology. An X-ray fluorescence spectrometer (XRF) was used to analyse the concentration of heavy metals. The change of concentration of the tested elements in wood biomass after pretreatment was small (except for iron). On the other hand, the average concentration of iron in wood biomass of a 5-year-old Populus trichocarpa, after SE and LHW with duration of the pretreatments 15 and 60 min, increased about 24-fold to 28-fold, comparing to its average concentration in native wood. During the pretreatment process, wood biomass absorbed the iron that at high temperatures passed from the pretreatment equipment to the solution. The average concentration of the elements under research in liquid fraction obtained during SE and LHW of wood biomass with duration of the pretreatments 15 and 60 min was at a low level.
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