Untersuchungen über Emissionen bei der thermischen Verwertung von holzschutzmittelhaltigen Holzresten

Since the introduction of strict legal conditions, the disposal of used wood and wood residues treated with wood preservatives became subject of many and diverse discussions. An alternative to disposal and recycling in principle is the thermal utilization, the application of which, however, is ruled by the emission behaviour of the individual fuel components during the combustion process. Due to the fact that up to now only few experimental findings on emissions of organic and inorganic substances during the combustion of wood treated with wood preservatives were known, the combustion behaviour of wood residues and used wood containing wood preservatives, after mixing with untreated wood in a ratio of 1∶4, was investigated in several test series. The presented results for organic solvents, creosote, Cu-HDO and CCB show that the concentrations of the harmful chemicals occuring in the exhaust gas correspond approximately to those registered for untreated wood. Even properties decreasing the emissions were found for Cu-HDO and CCB. The fixed limit values for polychlorinated dibenzodioxins and dibenzofurans also can be observed provided there exist good combustion conditions.