Dec 21, 2006

Bioreclamation of coalmine overburden dumps--with special empasis on micronutrients and heavy metals accumulation in tree species

Environmental Monitoring and Assessment
Subodh Kumar Maiti

Abstract

Major environmental impacts of opencast mining are degradation of landscape and aesthetics of the area by creating huge overburden dumps and deep voids at the mining sites. These overburden dumps are characterised by high rock fragment contents, low moisture retention capacity, higher bulk density, low nutrients, lower pH and elevated metal concentrations. Overburden dumps are reclaimed by tree species for stabilising as well as pollution control and overall improvement of the visual aesthetics. A field study was carried out in the old reclaimed coal mine overburden dumps at KD Heslong project, Central Coalfields, India to study the physico-chemical changes in the reclaimed overburden dumps and determines the magnitude of trace elements accumulation in the planted tree species. Total, bioavailable and acid extractable trace metals concentration in minesoils of overburden dump and topsoil in the mining areas was compared with undisturbed soil. The study showed that tree plantation improves the moisture contents, bulk density, pH and overall nutrient contents of minesoils. The study revealed that lower pH in the minesoils increases the bioavailabity of metals but concentration were found within toxic limits. However, ratio betwee...Continue Reading

Mentioned in this Paper

Trees (plant)
Waste Disposal, Solid
Metals, Heavy
Trace metal
Bambusa
Eucalyptus
Micronutrients
Cassia
Dalbergia sissoo
Catabolism

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