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Waste Management & Research, Vol. 23, No. 2, 126-132 (2005)
DOI: 10.1177/0734242X05051195

Heavy metal content of combustible municipal solid waste in Denmark

Christian Riber

Environment & Resources DTU, Technical University of Denmark, Kongens Lyngby, Denmark, chr{at}er.dtu.dk

Gry S. Fredriksen

Environment & Resources DTU, Technical University of Denmark, Kongens Lyngby, Denmark

Thomas H. Christensen

Environment & Resources DTU, Technical University of Denmark, Kongens Lyngby, Denmark

Data on the heavy metal composition of outlets from Danish incinerators was used to estimate the concentration of Zn, Cu, Pb, Cr, Ni, Cd, As and Hg in combustible waste (wet as received) at 14 Danish incinerators, representing about 80% of the waste incinerated in Denmark. Zn (1020 mg kg-1), Cu (620 mg kg-1) and Pb (370 mg kg-1) showed the highest concentration, whereas Hg (0.6 mg kg-1) showed the lowest concentration. The variation among the incinerators was in most cases within a factor of two to three, except for Cr that in two cases showed unexplained high concentrations. The fact that the data represent many incinerators and, in several cases, observations from a period of 4 to 5 years provides a good statistical basis for evaluating the content of heavy metals in combustible Danish waste. Such data may be used for identifying incinerators receiving waste with high concentrations of heavy metals suggesting the introduction of source control, or, if repeated in time, the data must also be used for monitoring the impacts of national regulation controlling heavy metals. It is recommended that future investigations consider the use of sample digestion methods that ensure complete digestion in order to use the data for determining the total heavy metal content of waste.

Key Words: Waste characterization • heavy metal content • solid waste incineration • wmr 772-3


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