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Results of remediation of hard coal overburden and tailing dumps after a few decades: Insights and conclusions by S. Willscher; T. Hertwig; M. Frenzel; M. Felix; S. Starke is a Engineering article available to read on EtoBox.

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The historical hard coal mining area of the districts of Zwickau and Lugau/Oelsnitz in Saxony (Germany) is a source of heavy metals and arsenic polluting the adjacent ground-and surface waters. Some of the dumps are partially older than 150 years, and some of them were remediated more than 50 years ago. Today we still can learn from the more or less successful remediation measures after some decades of application. In this paper, three different dumps are presented and differences between their remediation measures and longterm success are pointed out. As a result, especially a sealing and covering of a dump turned out as very successful for the prevention of AMD (acid mine drainage) generation. Thus, a reduction of the specific seepage water load of SO 4 2-, Zn 2+ , Ni 2+ and Cd 2+ up to 85%, 98.6%, 98.5% and 99.98%, respectively, compared to a revegetated, but not additionally covered dump could be achieved. The covered dump has been stable since more than 50 years; only a low pyrite oxidation grade was detected. But also the infiltration of oxygen consuming organic substance from the top of the dumps and/or by inflowing groundwaters makes a further contribution to the long-term

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Author

S. Willscher; T. Hertwig; M. Frenzel; M. Felix; S. Starke

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-386X)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)