Deep remediation and improvement of soil contaminated with residues oil using lime piles

摘要

In the present study, the impacts of residues oil on the geotechnical properties of clayey soil have been investigated. The study also includes using lime piles for the remediation of the contaminated soil samples and measures the improvement in geotechnical properties of soil samples. The lime piles technique can be considered as one of the sustainable techniques used for deep remediation and improvement of soil. The residues oil is a by-product effluent from the fuel used in thermal electric power plant. The clayey soil samples are artificially contaminated by two types of contaminants: the first one consists of 49% residues oil, 21% kerosene, and 30% water, and the second consists of 70% residues oil and 30% kerosene. The soil samples are soaked in contaminants for 30 days to ensure the infiltration of contaminant deeply in the soil samples and almost completion of chemical reactions to get homogenous soil samples. Lime piles are prepared by mixing 15% of lime with dry soil weight and poured into the holes of 20 mm diameter and 500 mm length, where the remediation process continued for 30 days. The results of tests detected that lime piles technique have significant impacts on the chemical and engineering properties of contaminated soil samples, where the recovery in undrained shear strength ranged 26-34% and modulus of dynamic subgrade reaction ranged 25-34%, but slight effects on the compressibility of soil and rate of consolidation which ranged 3-4%, where increasing the permeability of soil samples have been noticed.