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In view of the population growth of the country in the past decades and reliance of the national economy on petroleum products without the presence of a logical structure and high energy consumption particularly fossil fuels, the environment and underground water in industrial centers are seriously being threatened.
Oil refining and petrochemical plants, oil storage facilities and Shazand Power Plant are using groundwater.
During the process operation, air, soil and water are being threatened due to leakages and drainage of waste water. For this reason, in the period of spring to winter 1378 (1999), sampling of groundwater from 5 stations of Arak Refinery had been conducted seasonally.
Water samples transferred to laboratory in standard conditions, hydrocarbon, phenolic and polyaromatic compounds, COD and TOC have been measured according to ASTM and Standard Methods.
The average concentration of oil and grease, COD and TOC were 0.81 , 7.13 and 1.9 mg/l, also the average concentration of phenolic compounds and polyaromatic hydrocarbons were 0.76 and 12.2 µg/l respectively. Comparing results with admissible concentration of phenolic and polyaromatic hydrocarbon compounds for drinking water standard, which are 0.5 and 0.2 µg/l, results were high, and comparing with concentration of oil and grease, phenolic compounds and COD for irrigation and agriculture, they were 10, 1.0 and 200 µg/l, which were low, respectively.