Document Type : Original Articles
Authors
Department of Environmental Engineering, Faculty of Environment & Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Abstract
Many environmental problems are caused by the irregular expansion of Tehran. The most important problems are due to petroleum installations to the south of the Tehran Aquifer, lack of due attention paid to environmental standards, produced by local petroleum companies. The aim of this study is the survey of measure soluble petroleum in Tehran Oil Refinery groundwater. The area of investigation comprises Rey industrial zone with 900 hectares where its drinking water is provided by seven qanats, deep and handy wells, and the Jajrood, Karaj and Kan Rivers. The annual average temperature, rainfall and evaporation are 17 ̊C, 200 mm and 2500 mm, respectively. Hence, sampling from 8 water wells and analysis of the samples were carried out during the summer and winter of 2008-2009. Finally, the results were shown in some figures and compared with national standards. The results of analysis for parameters (such as BOD, COD, oil and grease, phenol, TPHs, aromatic and aliphatic hydrocarbons) are as below: COD(10-55000 mg/L), BOD (1-30555 mg/L), phenol (0.01-0.08 mg/L), oil and grease (5-130 mg/L), TPHs (0.05-25.5 mg/L), aliphatic hydrocarbons (1.7- 0.001 mg/L) ad, aromatic hydrocarbons (0.034-2.13 mg/L). Results show that the quantity of oil pollutants in stations 4 (Bagher Abad), 5 (Esmail Abad) and 3 (Azim Abad) is high compared with the other stations. In other words, the quantity of oil pollutants in Dorsun Abad , Esmail Abad and Azim Abad villages is more than in Kheir Abad, Bagher Abad, Shahr Sang and the western side of Tehran Oil Refinery Company. Also, the concentration of oil pollutants in the winter compared to spring is very high. As a consequence of this investigation, it is obvious that the quality of major water sources is not suitable for drinking or agriculture consumption. In addition, the wastewater produced by Tehran Oil Refinery Company, spills from Tehran’s domestic wastewater channel and leakage from underground oil transfer lines are the most important of sources of pollution in local groundwater resources.
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