Approaches for the Restoration of Strongly Acidic Mining Lakes
The acid lakes in Germany are the final result of lignite mining that lasted for decades. The overburden:lignite ratio ranges from 3:1 to 6:1; the resulting material deficit accumulates as mining progresses. In addition, at some sites, the overburden removed during the initial excavation was piled up and revegetated; had this material been replaced in the final cut, the lake volume would be significantly reduced. Also, at some sites, some of the overburden was removed for use as sand and gravel, adding again to the material deficits. For all of these reasons, some of the lakes are very large (over 9 km2).
KeywordsSugar Sulfide Sludge Acidity Sewage
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