INVESTIGATING THE INFLUENCE OF CLAY & HEATING IN REMEDIATION OF CONTAMINATED SOIL FROM GAS-OIL BY SOIL VAPOR EXTRACTION (SVE)

Utilizing considerablepetroleum products, increasing soil contamination and need to its clean-up is one of serious environmental issues. Soil vapor extraction is a common and very wide used method for soil remediation because of its Easy operation, low cost and high efficiency.In this paper, influence of soil type and heating, as two important parameters in efficiency of soil vapor extraction method is examined. The used soil isblown sand, which is mixed with different percentages ofkaolinite clay. Establishing pilot and running experiments, the result of soilsremediationout of aliphatic hydrocarbons in gas-oil is reported. The results indicate thatenhancement of clay percentage leads to great reductioninclean-up efficiency.After 24 hours test running,removal efficiencyreached to 78.4%for the soil with 20% clay content, while this efficiency fell down to 23.75% for the soil with 40%of clay content. Having no clay within the soil, soil-heated vapor extractionmethod did not causenoticeable increasing in clean-up efficiency. However, heating has the most influence and increases cleanup efficiency for 20.6%with presence of 20% clay within the soil, while presence of %40 clay decreasesthe efficiency to 12.57%. key Words Clay, Heating, Soil Remediation, Soil Vapor Extraction Method, Gas-Oil.