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Contenuto archiviato il 2024-06-10

Rehabilitation & revegetation of mining waste-dumps by the use of industrial&domestic sewage sludges from waste-water purification plants

Obiettivo



The utilization of waste as secondary raw material is a fundamental principle of the so called sustainable development, worldwide. Prerequisite for the usage of pollutant bearin } material isz that a negative impact on the environment can be excluded. Waste dumps resulting from open-cast and underground mining operations constitute a serious environmental problem if thev are not properly rehabilitated and revegetated. because untreated dump-sites form a source of continuous emission of dust fumes and a source of possible groundwater pollution. One significant cost-factor of the rehabilitation results from the neccessity of purchasing soils, if in situ soil is not available. This cost-factor could be substantially reduced by using the positiv physical, chemical and biological properties of mixtures based upon industrial residues (fly ash from power stations, red mud from alumina production, flotation tailings) and slewage sludges as a fertile component. Caping the waste dumps and at the same time create a fertile substratum for revegetation can contribute to the solution of safe diposal/utilisation of industrial residues and rehabilitation of waste dumps resulting from the mining industry. Additionally the usage of these residues as secondary raw material save natural resources and avoid the demand of disposal-site volume. Sludges, especially sewage sludges and industrial waste contains a large number of different potential contaminants, which causes environmental problems. This requires a methodology to deposit the artifical top soil in place and mix it with the uppermost layer of the waste dump and to prevent the toxic components of the mixture from being leached out of the soil. As a basic research project, the research aims at developing the initial artifical top soil mixtures in the laboratory under consideration of the geogenic conditions, followed by field testing of the mixtures in designated test beds provided by industrial partner and the development of a probably coupled 3D Finite Difference-Finit Element Model model for the contaminant sorption and transport to investigate the long-term behavior. The project involves seven research partners (three universities. four industrial partners) from Germany, United Kingdom and Ukraine who will carry out research into elements that lead to the development of this integrated and probably environmentallv acceptable method. Given that the laboratory test and field tests prove the safe applicability of this technique and. if the predictions of the groundwater model also indicate long terrn stability to the pollutant components in the mixtures, the developed technique can be considered for fullscale industrial trials in an industrial project.

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Coordinatore

Technische Universität Berlin
Contributo UE
Nessun dato
Indirizzo
135,Stasse des 17 Juni
10623 Berlin
Germania

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