The assessment of the storage capacity of heavy metals (Zn, Cu, Ni) in Lemna minor L., was carried out on wastewater from galvanizing plants. Purification yield decreases with increasing metal concentration in water. The rate of bioaccumulation is high in the first three days, then decreases over the next four days.

In the field of renewable energy, national targets imposed by the European Directive on promoting the use of energy from renewable sources is to reach 24% of gross final consumption of energy by 2020. This paper presents a solution for this target and for sustainable management of ash and slag closed deposits by plantation of energetic crops. Process of plantation was assessed by tracking energetic crops by determining the capacity of metals accumulation in wood biomass, correlations between the crops diameter and height, chemical composition of ash. The obtained data were compared with similar data recorded for other intensive crops. Amount of biomass harvested from 5.3 kg/m2 green table (after 3 years) reveals a good development and production of plantation wood, grown on the surface of ash and slag deposit. Based on obtained experimental data, we propose a model of vegetation with energy plants (Salix sp.) of a deposit of ash and slag after its closure was achieved. By implementing experimental model these surfaces can be reinserted in landscape and economic circuit, being in accordance with the provisions of Order No. 757 of 26/11/2004 for approval the Technical Normative of Waste Storage.

No abstract

This study shows the wastewater efficient treatment process resulted with Fe-Al complex coagulation agent obtained from industrial waste. Coagulation agent prezented 24.5 -28.0 g·L -1 Fe and 16.0 -17.5 g·L -1 Al content. pH coagulation agent is in the range pH=1-2. The wastewater with high degree i.e. chemical oxygen demand (COD) = 25,000-30,000 mg O2·L -1 , Total organic carbon (TOC) = 3,600 -4,000mg C·L -1 , dry matter = 9.55 -10.45 g·L -1 , etc. is resulted from printing house. Treated water samples with the optimal dose of coagulation agent based on iron-aluminium salts obtained from industrial waste prezented similar TOC and dry matter reduction efficiencies with samples treated with the optimal dose of ferric chloride. COD reduction efficiency in treated water samples with the optimal dose of coagulation agent based on iron-aluminium salts it was 10% greater vs. reduction efficiency obtained from samples water treated with classic coagulation agent, FeCl3. The advantage of the complex Fe-Al coagulation agent obtained from industrial waste was that it can be used for some wastewater of printing house in lower optimal dose, by 30%, vs. ferric chloride, coagulation agent. The complex Fe-Al coagulation agent obtained from industrial waste cost is much less than that of classical coagulation agents.

The paper presents the preliminary results obtained in a study aimed to assess the level of air pollution with heavy metals in urban areas by means of using bioindicators. The tests were carried out in one of the most polluted cities in western Romania, using as bio-indicators corticolous lichens collected from seven representative sites for air quality in the city. The assessment level of air pollution with heavy metals (Cd, Ni, Pb, Cu, Mn, Zn, Cr) was based on the effect that their presence could induce on lichens. Thus, two methods were used for the quantification of the effect such as: a) IAP method, variation in diversity and abundance-calculation of the value of Index of Atmospheric Purity, IAP and b) determining the content of heavy metals in the lichen thalli, respectively. Classification of air quality from the seven sampling sites in pollution classes (low pollution, moderate pollution, high pollution and very high pollution) was based on the statistical tests for correlation between the metal concentration in the air and the specific parameters for the two evaluation methods (the IAP index value for the first method and the metals concentration in the lichen thalli for the second method). The tests results revealed a differentiated air quality in the seven sites, also indicating the method of biomonitoring with corticolous lichens as a viable option for assessing the air quality in polluted areas with heavy metals.