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.
Environmental pollution represents an important and complex subject with a huge concern for both scientists in different fields, but also for the governments, national and international organizations. Besides the indisputable advantages of the industry for the human development, it has a big contribution to environmental pollution with negative effects to the human health. Heavy metals in the environment have negative effects to the ecosystems and to human health. Consequently, it is necessary to determine the level of heavy metals in the environment to take measures to reduce the environment pollution. According to this issue, the main purpose of these research studies is to perform a comparative analysis of heavy metals content in Targu-Jiu and Rovinari area, those being ones of the most pollution affected areas in Jiu county. The results obtained show that the heavy metals contents in PM10 in the air in these areas chosen for the study are below the permitted limit values for the period 2015-2016.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.