The technology and the installation of acid mine water treatment by bioaccumulation, is realized in three distinct stages, namely: the primary stage, consisting of raw water capture, treatment with neutralizing and coagulating chemical reagents, solid phase settling and sludge treatment, [I, II , IV, V], the secondary stage, consisting in the removal of heavy metals and the neutralization of acidity by passing the effluent of the first stage, through a battery of phytoextraction cells, [III],using for this purpose truncated cells. In the tertiary stage, the stabilization of heavy metals in the thickened clearing and the aerial part of the sedge takes place.

This paper presents some results of the researches regarding the landslides produced in the rock dump Bujorăscu Valley, administrated by National Society of Lignite Oltenia. The paper analyses the geotechnical characteristics of the rocks and water influence on them. It was found that, as a result of water infiltration in the waste dump's body, rocks resistance is considerably reduced and appears areas with high plasticity and sliding surfaces. From the statistic data processing there were established the values of the internal friction angle which makes the dump stable. In the end of the paper work are presented solutions for increasing the dumps stability and for ecological rehabilitation of the areas affected by landslides.

Ecological restoration and reuse of degraded lands must contribute to the region's sustainable development. Therefore, in order to determine the post degradation land destination, a number of opportunities and restrictions should be taken into account. For this reason, it is necessary to develop a methodology for establishing the optimal reuse alternative, which should be based on scientific principles, without neglecting economic issues and those related to population requirements. For this purpose the paper is focused on several aspects regarding the restrictions that must be considered in the decision-making process, related to the attraction or dislike of the territory for different ecological restoration options (regional climate, regional topography, ecosystems and land uses, environmental risks, quality indicators of the land etc.). Thus, we developed a methodology for determining the optimal type of land rehabilitation that takes into account a number of factors and indicators and can be applied in all situations, regardless of the form or level of degradation.

The present paper focuses on conducting research, based on physical, chemical analysis of treated sludge from the waste water treating systems and on physical, chemical and pedological analyzes on sterile material (soil), achieved in order to turn both residues, by mixing and a mutual treatment, into an useful, friendly environmental material, useful for further cultivation. One determined in situ probes from the Lupeni sterile dumps different characteristics such as: thickness of the soil layer, its physiological width, structure and porosity, permeability, humidity, soil reaction, effervescence with HCl, the nature of humus, soil texture, the presence, nature and abundance of soluble salts. Further one researched on electrokinetic�s disintegrated sludge, and applying ultrasonic technology, and concluded about the possibility of using the sludge on the degraded lands of the Jiu Valley. The sludges from the purification contain: clay particles entrained by street water into the sewer network; organic substances from domestic sewage and human manure; soluble / insoluble salts; various species of cat-ions and an-ions retained by the colloidal fraction of organic or mineral nature and microorganisms. As result, the tests demonstrated the improved soil quality on degraded lands by fertilizing with purified sludge. The superior growth of platelets in sterile mixture vessels and 75 % fermented sludge, versus experimental samples with 75 % sterile material. The use of sludge treated in land conversion has a unit cost of 210 � 250 euros/ tonne dry substance (d.s.).

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