Abstract

At time the influence of the waste input of the quality and the reuse of MSWI bottom ashes as granular material for the building industry is unknown in a great extent. So in 10 MSWI power plants of different process technologies definite volumes of typical wastes of the respective plants are thermal treated for two weeks. In three MSWI power plants additional experiments with different waste inputs are feasibled to minimize the influence of the process technology. In three additional MSWI power plants samples of MSWI raw bottom ashes were taken permanently for a time of 2 weeks to get informations about short time influences of the waste input. Within the framework of this research project the coherence between different waste fractions and the mineralogical, structural engineering and environmental relevant properties of processed and stored MSWI bottom ashes are investigated. The following results are recognizable: A homogenous waste input leads to a homogenous mineralogical composition of the MSWI bottom ashes. Short time variances leads to different mineralogical compositions especially in the finer coarse fraction of the MSWI bottom ashes, which is responsible for the alteration behaviour and the necessary storing time after that a using as granular material in road construction and earthworks is possible. The waste fractions domestic waste and industrial waste leads after thermal treatment to comparable mineralogical compositions of the MSWI bottom ashes whereas the co-combustion of special fractions exert a great influence in comparison. Influences of different process technologies are visible. During processing and storing of the MSWI bottom ashes there are effects of homogenization recognizable, which leads to comparable mineralogical, environmental and structural engineering properties. The technical and environmental requirements for using the MSWI bottom ashes as material in road construction and earthworks are complied.

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