Paper Title
EFFECT OF AGING PERIOD ON THE PROPERTIES OF OIL CONTAMINATED SOIL

Abstract
Abstract - Soil and groundwater contamination by non-aqueous phase liquids (NAPL) has become a serious problem in the recent years because of increased usage of derivatives of crude oil. The process of extraction, processing, storage and transportation of oil involves the risk of soil contamination. Some of the reasons attributing to increased soil contamination are increased use of motor vehicles, leakage of underground storage tanks and pipelines transporting oil, oil spills due to accidents of oil transporting vehicles, effluents from oil refineries, poor disposal practices and many. The analysis of behavior of oil contaminated soil system if difficult because of the fact that oil is a mixture of a variety of components, it is immiscible with water and there is no proper information available on behavior of oil as a pore fluid. But it is known that the presence of oil in the soil system is going to alter the properties of soil. The oil is a mixture of volatile and non-volatile compounds. The properties of oil change with aging and so its behavior or interaction with soil particles in the soil system. So it is necessary to know the effect of aging period on the properties of oil contaminated soil. For this purpose, Sodium betonies (Bt), Kaolin (Ka), Sand (S) and Used Motor Oil (U.M.O) are used to conduct experiments on uncontaminated and artificially contaminated soil. Dry sieve analysis, Hydrometer analysis, Specific gravity, DFSI test, Standard proctor test, Direst shear test, Unconfined compression test and constant head permeability tests are performed on contaminated and uncontaminated soil samples as per IS code. The soil has been artificially contaminated by mixing 3%, 6% and 12% of oil to the dry weight of soil and the contaminated soil is sealed in airtight plastic bags and experiments are conducted after a period of 7 days, 14 days and 28 days to observe the effect of aging on the properties of oil contaminated soil. The results indicated a significant change in the behavior of soil. Keywords - NAPL, Soil Contamination, Aging Period