Ecology, Environment and Conservation Paper

Vol.17, Issue 2, 2011; Page No.(441-445)

SHEAR STRENGTH CHARACTERISTICS OF DIESEL CONTAMINATED COMPACTED SOIL WITH SURFACTANTS

P. Vasudeva Rao, K. Sivaramakrishna, R.K. Srivastava, R.P. Tiwari, B. Sudhakararao and P.V.V. Satyanarayana

Abstract

A Laboratory study was performed to understand the geotechnical properties of diesel contaminated soils for identification and classification. Locally available soil in Allahabad, U.P. (India) has been collected for this study . Sodiumlauryl sulphate and liquid organic cleaner were used as a surfactants in remediation of diesel contaminated soils. The physical and engineering properties of virgin, contaminated and decontaminated soil samples are studied. The soil was contaminated with different percentages of diesel, i.e. 20 mL/kg, 40 mL/kg and 60 mL/kg by weight of dried soil, to simulate the effect of contaminant on the virgin soil. The decreasing trend in cohesion intercept and UCS, whereas increasing trend in optimum moisture content have been observed on contamination with diesel as compared to the virgin soil. In order to decontaminate the diesel contaminated soil by soil washing technique, 4 g/kg soil SDS and 4mL LOC in one litre of water has been used separately. After decontamination it was observed that the cohesion intercept, Max. dry density and UCS increases, where as and optimum moisture content of soil decreases and the value of the geotechnical properties were found near to the properties of virgin soil. There was a marginal change in angle of internal friction values. To compare the results an alternative method of Fourier transform infra red (FTIR) spectroscopy was carried out on laboratory virgin, contaminated and decontaminated soil samples. These results show that maximum contaminants were removed by surfactants at optimum dose.

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