Leaching Assessment of PAHs from Oil Contaminated Sites

Subject Areas : environmental management

Akbar Baghvand ¹ (Associate Professor, Environmental Faculty-University of Tehran)
Ali Daryabeigi Zand ² (Assistant Professor, Department of Environmental Faculty University of Tehran)
Ali Vosoogh ³ (3-PhD Student of Civil & Water Engineering, School Of Civil Engineering, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY)

Received: 2010-12-31 Accepted : 2011-11-13 Published : 2014-12-22

Keywords: Polycyclic aromatic hydrocarbo, Soil pollution, Column leaching test,

Abstract :

Introduction: Polycyclic aromatic hydrocarbons are in amongst of the most important environmentalpollutants. Their leaching from soil into groundwater is one of the most important environmentalconcerns. Considering the high volume of activities in oil industry, many sites have beencontaminated with oil compounds in Iran. Since soil remediation costs are very high, making adecision about remediation or not remediation of the oil polluted soils needs a careful assessment.Material & Methods: Column leaching test was applied in the current research as a modern andeffective tool to predict leaching of PAHs from soil. In order to do this procedure, the contaminatedsoil from south of Tehran city (near the oil refractory) were prepared. Then, dried in the air and sievedfrom 2 mm. The material of soil was silt and clay; also had a 1.81 percent organic carbon. The testswere done in glass column with 600 cm3 capacity (6 cm diameter, 21 cm high).Results & Discussion: Results showed that only a small part of available PAHs in solid phase (soil)leached into water and high concentration of PAHs in the solid phase dose not necessary imply seriousgroundwater contamination risk and significant amount of PAHs may stay in the soil for a long time.

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