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Ecoterra, No. 6, pp. 8-9, 2005

Ruxandra Mălina PETRESCU
Universitatea Babeş-Bolyai din Cluj-Napoca, Facultatea de Ştiinţa Mediului

Abstract: Along millions years, natural barriers - mountains chains, extended marine surfaces, deserts etc. - prevented vegetable and animal species to migrate toward new habitats. These natural barriers allowed ecosystems to evolve in time in a relative isolation. With the development of human migrations and the commerce, an increasing number of species were introduced into new areas. In the last decades due to globalization process, the frequency of biological invasions increased dramatically. This invasion rate excels a million times the natural rhythm in certain areas.
Key words: bioinvasion, alien species, globalisation, human migration, native species

Ecoterra, No. 6, pp. 12-13, 2005

Muzeul Olteniei, Craiova
Universitatea din Piteşti

Abstract: Ecological reconstruction in Danube’s floodable area represents a national objectiv because of its ecological and economic importance. The construction of a dam having 1157 km in lenght alond the Romanian sector of the Danube caused the depletion of 400000 ha of lakes, pools, brooks, marshes, floodable fields. The aim of this extended work was the obtaining of great surfaces available for agricultural purposes. After a short period of time, these surfaces prooved to be unproductive. In this conditions, the problem of ecological reconstruction of the Danube’s floodable area is often discussed, in order to regain its initial economic and ecological attributes.
Key words: ecological reconstruction, floodable area, Danube, dam

Ecoterra, No. 6, pp. 19-21, 2005

Iustianian PETRESCU, Alexandru SZAKÁCS
Universitatea Babeş-Bolyai din Cluj-Napoca, Facultatea de Ştiinţa Mediului

Abstract: The Ciomadul massif, only 1310 m high, is located in the Southern Harghita Mountains within the Eastern Carpathians, representing the Southern ending of the Călimani-Gurghiu-Harghita volcanic chain. The volcanic manifestations were deployed within this volcanic arc since the low Miocene, some 21 million years ago and they went on during the remaining Miocene, in the Pliocene and during the majority of the Pleistocene. The eruptive history of the Ciomadul volcano began approximately 1 million years ago, the most recent eruption happening 10,000-11,000 years ago. Seeing the so recent age of the latest eruption, we can ask this legitimate question: is there the danger of an eruption in the near future? As far as we currently know, on the one hand we can assert that a possible future eruption of the Ciomadul volcano cannot be totally excluded. On the other hand, there is no clue to suggest that such situation could become real in the near future, that is to say in the next dozens or hundreds of years. A possible future eruption would have disastrous effects on the environment around the volcano, on an area whose size depends on the nature and the intensity of the eruption.
Key words: volcano, Călimani Mountains, Ciomadul massif, eruption, eruptive history

Ecoterra, No. 6, pp. 28-29, 2005

Grigore VLAD, Călin RADU, Mircea CRĂCIUN
S.C. ICPE Bistriţa S.A.

Abstract: At present days, in Romania, in most waste water treatment plants, man’s intervention is decisive for adjusting the parameters required for their correct functioning. Seeing the need of aligning our country’s standards to the European Community’s, there comes out the need of making some automated monitoring and controlling systems that provide optimal functional regimes with a minimal consumption of energy and materials and which replace – if not totally, at least partially – the intervention of the human factor. This work here presents a system of automated adjustment, which allows a concentration of oxygen dissolved in the water to be maintained at optimal values, as called for by the requirements of the processes of adjusting the parameters in the aeration tanks within the waste water treatment plants.
Key words: waste water treatment plant, monitoring, dissolved oxygen

Ecoterra, No. 6, pp. 30-31, 2005

Sorin ULINICI, Grigore VLAD, Călin RADU
S.C. ICPE Bistriţa S.A.

Abstract: The ozone is usually used for treating the water with an aim to disinfect and to remove the organic substances by advanced oxidation. Systematical studies for using it in the gaseous stage for treating the atmosphere of the enclosures were but performed after the ‘90s. Thanks to its properties of inactivating the bacteria, the viruses and the fungi, the ozone treatment method proves to be one of the most appropriate for removing the aero-micro-flora. The work displays the method of treatment used, experimental data and theoretical views related to the action of the gaseous ozone in the process of treating the atmosphere of the enclosures.
Key words: ozone, disinfection, enclosures’ atmosphere, advanced oxydation

Ecoterra, No. 6, pp. 32-33, 2005

Sevastiţa VRACIU
ICIM Bucureşti

Abstract: ADAS, under DEFRA’s coordination, has developed a decision support system that predicts the availability of the nitrogen from the natural fertilizer in the culture, leading to an optimal application on the field. The ADAS Procedure of Assessing the Nitrogen Natural Fertilizer (MANNER) sketches the latest information of the research conducted in England on the factors that affect the availability of the nitrogen from the natural fertilizer in the culture, as well as the nitrogen losses by volatilization and the nitrogen percolation. The MANNER software only needs a few input data for running, starting with the total nitrogen of the natural fertilizer, the light availability of the nitrogen and the content of dry matter. MANNER can be used for calculating the ‘typical’ values for selecting the solid natural fertilizer and the both liquid and half-liquid natural fertilizers. Some other input data required include the date and the rate of the application, the application technique, the speed of the incorporation into the soil and the amount of rains between the application date and the end of the application period. The predictions provided by MANNER have been validated by the comparison with the experimental data collected independently. Good concordances have been found, which confirmed that MANNER could ensure a light and correct estimate of the equivalent value of the nitrogen fertilizer from the natural fertilizer spread under a field of interest.
Key words: MANNER software, natural fertilizer, soil, experimental data

Ecoterra, No. 6, pp. 34-35, 2005

Grigore VLAD, Mircea CRĂCIUN, Ancuţa CICEU
S.C. ICPE Bistriţa S.A.

Abstract: The main goal of the work consists in describing a technology of purging waste waters, where, if inserting an installation for treating the water with active oxygen, the biological purification efficiency should be increased 2 or 3 times, in case of an energetic consumption reduced by 50 %. The technology of the biological purification by a catalyzing with active oxygen aims at complying with a requirement of purity of the waste waters, by significantly reducing the CCO (the chemically oxidizing organic substance) by 40 %, but the most important thing is that the remaining 60 % turns into organic matters that biologically decompose themselves. What is more, the smells are eliminated, the water disinfection is achieved one hundred percent and the colour is reduced by 50-80 %.
Key words: waste water, active oxygen, biological purification, CCO

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