Characterisation of charcoal concerning organic and inorganic substances - comparative values to discuss 'biochar'

摘要

Due to new processes of biomass transformation like gasification, pyrolysis or hydrothermal carbonization there are coal-like residues or coal-like products. For those substances, commonly called "biochar", standardized definitions are not available at the moment. The gasification of wood and subsequent conversion into electricity via gas engines is currently the system most in use. The recyclability of coal-like residues or coal-like products will have a considerable effect on economic viability and social acceptance of the technology. Specific rules to evaluate the possibilities of recycling or other types of recovery, in particular for energy purposes are missing. Also literature data on the chemical composition of charcoal, to use for comparison with "biochar", is not available. The publication describes the characterisation of charcoal concerning organic and inorganic harmful substances. An initial evaluation of analytical data, also based on a comparison with values found at previous studies of "biochar", is made. The difference in the assessments of residues, generated in different stages of process is essential.