Sharif Digital Repository

Ground water is one of major resources of drinking water in Iran and thus, its quality (in terms of absence of pollutants) is a matter of great importance. The main goal of this research was to investigate the pollution concentration in the Ground water and soil in the fields near South Pars Gas Complex Co. (SPGC). The second goal was to determined the source and measure the distribution of the pollutants (in case of presence) and determine potential risks caused by them. The first step was to perform experimental tests in the two regions. In SPGC region, a number of wells were chosen for sampling according to the direction of Ground water movement. All samples were taken using two EPA... 

Oil and gas upstream, is one of the major parts of the energy chain in the world. Processes of production, transportation, processing and conversion of energy carriers are the main parts of this sector. Process units of oil and gas upstream industry are some of most local and global pollution resources in the world. In this research, the consideration of the pollutions from the production, processing and conversion of fossil fuels sector and the optimization of the management choices of each pollutant is subjected. Consideration of the pollutants related to the upstream sector, pollution control and management choices, cost accounting of the environmental impacts, the methods of accounting... 

As elevation increase, environmental impacts will change, and this will affect on vehicle performance. The pressure drop and consequently the drop in air density at high altitude affect the volumetric efficiency of the engine. This exacerbates engine combustion, since the engine displacement volume is constant, with the drop in air density, the intake air mass flow rate decreases. In this situation, the engine does not have enough air to burn the fuel, and as a result the engine ignition will getting into the defect. ECU only changes the amount of injecting fuel and has no control on the entering air flow to the engine. In such circumstances, emissions from the vehicle are expected to... 

The present study simulates the diffusion of nitrogen oxides from a typical thermal power plant by AERMOD. The amount of diffusion of nitrogen oxides in the environment in two sample days was assessed, one in the cold season and the other in the warm season. In the pessimistic state of the power plant on the sample day of the warm season did not cause the ambient concentration to exceed the standard level of clean air.In order to evaluate the share of different emission sources in the study area, emission sources are divided into three groups: industrial, suburban transportation and urban resources (domestic and intra-city transportation) and two modes of emission are considered. On the...