Use of nanoscale zero-valent iron to improve the shear strength parameters of gas oil contaminated clay

Document Type: Research Paper

Authors

1 Engineering Geology Division, Department of Geology, Faculty of Basic Sciences, Tarbiat Modares University

2 Engineering Geology Division, Department of Geology, Faculty of Basic Sciences, Tarbiat Modares University, Iran

3 Department of Chemistry, Faculty of Basic Sciences, Tarbiat Modares University, Iran

Abstract

In recent years, the nanoscale zero-valent iron (NZVI) particles have been used successfully for the degradation of hydrocarbon
compounds and remediation of other pollutants. Nevertheless, as far as we know, there is no specific study on the improvement of the
geotechnical properties of contaminated soils with hydrocarbon compounds by NZVI. This study used NZVI particles to remove gas
oil in a clayey soil and determined the effects of NZVI on Atterberg limits, compaction properties, and shear strength parameters of the
soil. In order to determine the optimal reaction time and NZVI dosage, the total organic carbon (TOC) of a contaminated soil with 9%
of gas oil was measured. The experimental data showed that the optimum reaction time and NZVI dosage were 24 days and 5%,
respectively. Then, the contaminated samples were prepared by mixing the soil with gas oil in the amount of 0, 3, 6, and 9% by dry
weight. The results showed a decrease in the friction angle (φ) and an increase in the cohesion (C). Maximum dry density and optimum
moisture content of the soil decreased due to the contamination. In addition, an increase in liquid limit (LL) and plastic limit (PL) were
observed. Finally, all contaminated specimens were mixed with 5% of NZVI. After 24 days, an increase was seen in the friction angle,
cohesion, maximum dry density, and optimum water content. LL and PL of the soil decreased after the treatment

Keywords


Article Title [Persian]

کاربرد نانو ذرات آهن صفر ظرفیتی برای بهبود پارامترهای مقاومت برشی خاک رس آلوده به گازوئیل

Abstract [Persian]

در سالهای اخیر نانوذرات آهن صفر ظرفیتی کاربرد های زیادی در تجزیه ترکیبات هیدروکربنی و پالایش سایر آلاینده ها داشته اند. اما تا کنون پژوهش مشخصی در مورد کاربرد آنها برای بهسازی خاک انجام نشده است. در این تحقیق از این نانو ذرات برای حذف گازوئیل از یک خاک رس آلوده استفاده شده و اثرات آن برحدوداتربرگ، تراکم و پارامترهای مقاومت برشی خاک بررسی شده است. نتایج نشان دهنده افزایش زاویه اصطکاک داخلی، چسبندگی، حداکثر دانسیته خشک و رطوبت بهینه خاک آلوده پس از اختلاط با نانو ذرات آهن می باشد. علاوه بر این، حد روانی و حد خمیری خاک کاهش یافته است.

Keywords [Persian]

  • نانو ذرات آهن صفر ظرفیتی
  • NZVI
  • رس
  • گازوئیل
  • آلودگی
  • پارامترهای مقاومت برشی
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