Underground Waste Repositories in Exhausted Coal Mines – Recent Developments
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Due to the general lack of appropriate surface waste dumpsites in North-Rhine-Westphalia (Germany), placing filter ashes and desulphurisation residues from power plants in underground coal mines has become an attractive alternative. The residues can be injected as a hydraulic suspension into exploited coal seams. In this paper, we summarize the fundamental geotechnical aspects that define the hydrochemical barriers for underground repositories. The environmental advantages and disadvantages of this concept are discussed. Laboratory and field investigations as well as modelling are presented in order to establish the environmental reliability of such repositories.
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