8.  Mobilization of Heavy Metals From Mining Wastes by their Covering with Soil and Phytoremediation

Authors: C. Bogatu, M. Lazarovici, S. Masu, A. Negrea, G. Mosoarca, M.Ciopec, N. Dragomir


Abstract:

This paper deals with the evolution of the transport processes for Cu, Zn, Mn and Fe from a waste mining deposit, resulted by copper ore processing at Moldova Noua enterprise, in south west part of Romania. Some areas of the deposit were covered with non-polluted soil layers, thickness of 5 and 10 cm from deposit neighbourhood, which were cultivated with grass plants like Festuca arundinaceea and Hippophae rhamnoides, in order to evaluate efficiency of metals separation. Metals transport took place by their accumulation in organic matter from soil, and concentration decresing from the other fractions of soil. Separation efficiencies of metals after five years, due to mining waste covering with soil and grass plants cultivation, were: Cu 52 %, Zn 70 %, Fe 39.2 %, Mn 77 %. The order of metals accumulation in leaves of grass plants was Fe > Zn > Mn > Cu.


Keywords: heavy metals, mining wastes, transport processes, phytoremediation

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