This paper presents the obtaining of copper sulfide CuS (covelite) from Cu(CH3COO)2.H2O and thioacetamide (TAA) system. The reaction was conducted in presence or absence of sodium-bis(2-ethylhexyl) sulfosuccinate (Na-AOT). The effects of various reaction parameters on the size and on the shape of nanoparticles have been examined. CuS obtained was characterized by X ray diffraction, IR spectroscopy, TEM � transmission electron microscopy and SAED selected area electron diffraction. The influence of surfactant to the shape and size of CuS (covellite) nanocrystals was established. The size of the nanocrystals varied from 10-60 nm depending on the reaction conditions such as quantity of surfactant.
On the top of the ecological priority list in Romania, waste management is on the third place following the problems regarding the surface and underground water pollution, as well as that of the atmosphere. The clean-up of the landscape represents an issue largely discussed in Romania. The paper presents the advantages of waste management for the landscape, which includes: waste gathering and transfer, waste selection, waste biological treatment and the storage. Some analyses of the constituent components of the soil are presented, in order to assess the possibility to use the compost obtained from waste household within a composting station in agricultural sector of the district of Gorj. The experimental data demonstrated the possibility of using the compost as a fertilizer on the agricultural fields. By applying good management and treatment practices of the household wastes, one may achieve long-tern economic objectives such as: the improvement of public health as well as the protection of the natural resources by diminishing the soil, water and air contamination.
The study aims to characterize the quality of surface waters in the middle of the river basin Jiu by monitoring physicochemical indicators of their quality, in 2013-2015. In this regard, the pH, dissolved oxygen (DO), biochemical oxygen demand (BOD5) of nitrate (NO3-), nitrite (NO2-), ammonium (NH4+), total phosphorus (Ptotal), chlorides and sulphates from water have been determined. Water of Jiu River and its tributaries of Gorj county have been monitored on representative sections for the evolution of their quality. It was found that the water from natural reservoirs monitored shows an evolution in the limits permitted by the regulations in force except biochemical oxygen demand and nitrites indicators for river Jiu and Tismana and nitrate and chloride content for Gilort River.
Monitoring and control of water quality for human consumption aims to verify if the water available to consumers meets the requirements of relevant legislation and in particular the values of parameters established. The paper presents a study on the assessment of the quality of drinking water distributed in the city of Targu-Jiu by analyzing the following physico-chemical quality parameters: pH, conductivity, turbidity, ammonia, nitrites, nitrates, chlorides, residual chlorine, hardness and aluminum ions content. From the results, it has been found that during 2013-2015, there were exceedings of the maximum permitted levels for residual chlorine and ammonium ion in drinking water samples.
The wastes co-incineration in cement ovens is a complex technology, based on a professional know-how, developed by specialists in the field of cement industry and environment protection. This paper presents the noxious effect on the atmosphere and the advantages of recycling of used tires as an alternative fuel in the cement factory. It was demonstrated a primary fuel consumption decrease of up to 35% by burning the used tires in the rotating cement oven, without diminishing the cement quality and damaging the environment.
The goal of this research study is to compare the air quality of two urban locations from Targu-Jiu County namely Rovinari and Turceni. Measurements of SO2 content with automatic analysers were used as a criterion to asssess the air quality. Rovinari and Turceni areas were chosen for this study due to the fact that there are located two thermal power plants considered high stationary sources with an important contribution to regional and global pollution by sulfur dioxide, nitrogen oxides and dust. Sustainable development of fossil fuel power plants cannot be done without the use of technology to limit or eliminate environmental pollution.
Studies regarding determination of SO2 content in the monitored areas were performed from January to December 2014. By interpreting the results obtained it can be concluded that the concentrations of sulfur dioxide in the ambient air are below the limit value set in legislation. This is mainly due to the developing of the programs for the progressive reduction of annual emissions of sulfur dioxide, nitrogen oxides and dust which was set up by operators of thermal power plants in order to comply with emission limit values. The high level of SO2 concentration in cold season is attributed to intensifying the burning of fossil fuels for household activities.
The research study performed aims to assess the degree of mineralization and nutrient contents of groundwater bodies in Gorj County in the period 2014-2015 based on the monitoring indicators such as: pH value, electrical conductivity, chlorides content, sulphates, nitrates, nitrites, phosphates, ammonium, sodium and potassium ions. Samples of waters were taken from eight wells located in depth groundwater bodies, code ROJi05 and ROJi08 in order to determine the mineral and nutrient contents. All the indicators monitored were taken into account for assessing the mineralization degree of groundwater. The values of monitored indicators of groundwater were within the allowed limits for drinking water according to Law 458/2002 amended by Law no. 311/2004 regarding the drinking water quality with the exception of sulfur content. The values of nutrient content exceeded the allowed limits for sulphates, nitrate, nitrite and ammonium.
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