Olimpia Ghermec

Particle Size Distribution of the Coal Bottom Ash from the Large Combustion Plant

Human existence is dependent on the consumption of electricity and of thermal energy. One of the environmental problems is represented by the particulate matter with the diameter of less than 2.5 mm derived from combustion of coal. In order to find solutions to reduce emissions at source, the particle size distribution of the coal bottom ash after removing it from the steam boiler of the large combustion plant from Romag Halanga in Drobeta Turnu – Severin area was determined. Dry particle size distribution shows that the major fraction is one that has a particle size of 125 μm. Particle size distribution in the smallest size fraction was performed with laser diffraction particle size analyzer Brookhaven 90 Plus Nanoparticle Size Analyzer. Particle size distribution shows that in the composition of the coal bottom ash were found particles with nanometric dimensions.

Studies on Integrated Waste Management in County Mehedinti

This paper studies the integrated waste management in Mehedinti county. Integrated waste management requires employing several waste control and disposal methods such as source reduction, recycling, re-use, incineration, and land filling, to minimize the environmental impact of commercial and industrial waste streams. Although integrated waste management is designed as a large-scale system, there are things you as an individual can do to support the system.

Transdisciplinarity - A New Vision in Forming Specialists in the Field of Environmental Engineering - Case Study

The complexity of industrial activities, the requests regarding the integrated pollution prevention and control, the development of the eco-design, the growth of the environmental performance and of the energetic efficiency, all of these need specialists trained in Universities, in the field of environmental engineering. The field of study of Environmental Engineering is considered both multidisciplinary and interdisciplinary. In the paper it is shown the necessity of a new approach of this field through transdisciplinarity. The case study refers to the relation between transdisciplinarity and the systems of renewable energy.

Research on Terrestrial Sequestration of Carbon Dioxide Potential from Anthropogenic Sources in Mehedinti County

The carbon cycle is quantitatively altered by the anthropogenic activities, especially by the carbon dioxide emissions. The soil has a fundamental role in this circuit, due the fact that, on the one side, it deposits the organic and non-organic carbon and on the other side, it holds the vegetation, which, through photosynthesis process, extracts carbon dioxide from the atmosphere and transforms it in organic matter. Therefore, the role of the soil in terrestrial sequestration is acknowledged. In this paper it is analyzed the terrestrial carbon sequestration potential in Mehedinţi County (Romania).

Environmental Strategies in Areas Affected by Ash from Large Combustion Plants

The great extent of industrialization in the world can have serious repercussions on the environment. Damage to agricultural ecosystems is produced not only by the industrial centers or mining, but also by the ash resulting from burning coal in combustion plants. Restoration in the agricultural exploitation of lands degraded by industry and the areas under deposits of polluting fly ash is a key objective that lies in the attention of scientists for better use of the entire land fund. The experimental results obtained in this sense are particularly promising. Most of the research went on using the ash dumps by biological fixation with vegetation and by binding and using a specific agricultural technique. Therefore, recultivation and fixation of fly ash dumps targets to protect the environment and reduce air pollution with dust from the ashes, i.e. to harness economic areas occupied by dumps.

Study of the Emissions from the Fuel Distribution Stations in Drobeta Turnu Severin

A major source of air pollution is represented by the means of transport. The largest share of gases polluting air comes from motor vehicles, mainly due to their large number. Regardless of the type of motor, vehicles pollutes air with carbon and nitrogen oxides, unburned hydrocarbons, sulphur oxides, aldehydes, plumbum, asbestos, soot, etc. But the activity of trading fuels (diesel, gasoline), lubricants, parts, accessories and auto cosmetics (which are sold in fuel sales and distribution units) is another source of environmental contamination. From this point of view we studied some gas stations located in Drobeta Turnu Severin area, the possibility of soil pollution, waste disposal, safety zone and fire security measures. Air emissions, wastewater discharge, safety and hygiene of jobs were also studied.

Researches Regarding Elaboration of Barium Hexaferrite from Microwave Heating

The paper presents the results of experimental researches on the formation of barium hexaferrite type M (BHFM) by microwave heating. The microwave heating process takes only a few minutes to obtain calcined barium ferrite powders. Micronic and nanometric powders of BaCO3 and α-Fe2O3 were used as raw materials. In order to obtain BHFM, the microwave heating process was used with following mixtures: stoichiometric homogeneous mixture of BaCO3 and α-Fe2O3 powders, mechanically alloyed mixtures of BaCO3 and α-Fe2O3 powders for 5 and 20 hours in wet medium using a high energy ball mill Pulverisette 4. Using high energy ball milling, the powder size was turned into nanoscale. After using the microwave heating process it was observed a significant reduction of temperature-time parameters to BHFM formation for mechanically alloyed mixtures compared to homogeneous mixture.

Research Regarding the Influence of the Compaction Pressure of the Iron Powder on the Processes that Take Place when Elaborating Steels Obtained through the Carburizing – Sintering Proceeding

The elaboration of carbon steels sintered through the enrichment of compactised iron powders in carbon in methane gas medium has allowed the development of an innovative technology that fort he first time is based upon the carburizing (the process of carbon enrichment, in different proportions) at the same time with sintering. The parts obtained through this proceeding have been analysed from the point of view of the physical and the mechanical characteristic in correlation with the compaction pressure of the iron powder.