Metal contamination in recovered waste wood used as energy source in Sweden.
2004 (English)In: Resources, Conservation and Recycling, ISSN 0921-3449, Vol. 41, no 1, 1-14 p.Article in journal (Refereed) Published
Large amounts of recovered waste wood (RWW) originating from construction and demolition activities (C&DWW) and industrial activities (IWW) are annually generated in Sweden. RWW is also imported for use as an energy source at biofuel boilers. Increased use of biomass is one strategy to decrease environmental impact, in general, and the emissions of green house gases, in particular. This study addresses the environmental and resource implications of metal occurrence in RWW that is used as an energy source at biofuel boilers. RWW contains elevated concentrations of arsenic, chromium, copper, zinc, mercury, nickel, lead and possibly cadmium. The metal composition of Swedish and imported RWW differs in that Swedish RWW contains higher concentrations of arsenic, chromium, zinc, nickel and copper, while imported RWW contains higher concentrations of lead, mercury and cadmium. Ashes from combustion of RWW are nowadays generally disposed in landfills due to their elevated metal concentrations. This practice makes it impossible to use these ashes as filler material thereby replacing extraction of raw materials and decreasing the need for landfill space. Furthermore, landfilling leads to accumulation of hazardous heavy metals that poses a future environmental and health problem. If RWW from construction and demolition should contribute optimally to a sustainable energy system, cleaner waste wood flows are a prerequisite. The elementary measure is to track potential pollution sources in this waste stream and find out which are significant. Furthermore, since most of the RWW is untreated and unpolluted wood, there is a great environmental potential to separate this flow through the waste management system. Such an approach might lead to decreased environmental pollution of heavy metals and an improved resource management.
Place, publisher, year, edition, pages
2004. Vol. 41, no 1, 1-14 p.
Heavy metal pollution, Demolition waste, Recovered waste wood, Industrial waste streams, Sustainable development, Waste bioenergy
Other Environmental Engineering Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-14069DOI: 10.1016/S0921-3449(03)00100-9OAI: oai:DiVA.org:liu-14069DiVA: diva2:22568