تاثیر ماده فعال سطحی بر پاکسازی خاک رسی آلوده به گازوئیل با استفاده از فرآیند الکتروکینتیک و تعیین مقاومت تک محوری خاک رس پس از پاکسازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی عمران- ژئوتکنیک، دانشکده مهندسی عمران و منابع زمین، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران.

2 گروه مهندسی عمران، دانشکده مهندسی عمران و منابع زمین، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران

3 دانشیار گروه مهندسی بازرسی فنی، دانشکده نفت آبادان، دانشگاه صنعت نفت، آبادان، ایران

4 گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران

چکیده

آلودگی خاک‌های حاوی مواد نفتی از مهم‌ترین چالش‌های زیست‌محیطی جهان امروز به شمار می‌رود. بنابراین ضروری است تا در مورد پاکسازی مواد نفتی از جمله گازوئیل تدابیری صورت گیرد. جهت پاکسازی این ترکیبات از خاک راهکارهای مختلف از جمله استفاده از فرآیند الکتروکینتیک به‌کار می‌رود. نتیجه فرآیند الکتروکینتیک در خاک، حرکت آب، یون‌ها و ذرات باردار در اثر ایجاد اختلاف پتانسیل الکتریکی می‌باشد. در این تحقیق، پاکسازی خاک رسی آلوده به گازوئیل به روش الکتروکینتیک در حضور مواد فعال سطحی ABTS و Saponin مورد بررسی قرار گرفته است و اثر کنترل pH در کاتولیت و آنولیت بر فرآیند اصلاح الکتروکینتیکی خاک رسی ارزیابی شده است. نتایج نشان داده که در غیاب ماده فعال سطحی، روش الکتروکینتیک بازدهی حذف خیلی کم به میزان 3 تا 7 درصد داشته ولی در حضور ماده فعال سطحی بازدهی حذف افزایش چشمگیری به میزان 20 تا 54 درصد داشته است. با کنترل pH در کاتولیت و آنولیت و افزایش غلظت ماده فعال سطحی بازدهی حذف گازوئیل از خاک افزایش یافته است. با کاربرد Saponin، کمترین میزان حذف در غلظت 0.05 برابر با 20 درصد به‌دست آمده است، در حالی که ABTS توانسته حدودا 54 درصد از گازوئیل را در بیشترین غلظت ماده فعال سطحی (0.15 درصد) حذف کند. در ادامه تحقیق، آزمایش تک محوری جهت تعیین مقاومت فشاری محصور نشده نمونه خاک انجام گرفته است که نشان می‌دهد که فرآیند پاکسازی سبب افزایش مقاومت فشاری خاک به میزان 15 درصد خواهد شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Surfactant on Cleaning of Diesel Contaminated Clay Soil Using Electrokinetic Process and Determining the Uniaxial Resistance of Clay after Cleaning

نویسندگان [English]

  • Ali Taherian 1
  • Maryam Yazdi 2
  • Iman Danaei 3
  • Amirali Zad 4
1 PhD Student in Civil Engineering Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
2 Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
3 Associate Professor, Department of Technical Inspection Engineering, Abadan Faculty of Petroleum, University of Petroleum Industry, Abadan, Iran
4 Department of Civil Engineering, Islamic Azad Uinversity, Central Tehran Branch, Tehran, Iran
چکیده [English]

Pollution of soils containing petroleum products is one of the most important environmental challenges. Therefore, it is necessary to take measures for the purification of petroleum products, including diesel, to clean these compounds from the soil, various solutions are used, including the use of electrokinetic process. The result of the electrokinetic process in the soil is the movement of water, ions and charged particles due to the difference in electrical potential. In this study, the purification of diesel-contaminated clay by electrokinetic method in the presence of ABTS and saponin surfactants is investigated and the effect of pH control on catolite and anolite on the electrokinetic modification process of clay is evaluated, The results show that in the absence of the surfactant, the electrokinetic method has a very low removal efficiency of 3% to 7%, but in the presence of the surfactant, the efficiency is significantly increased by 20% to 54%, with pH control in Velit. and anolyte and the amount of active substance increase the level of efficiency of diesel removal from soil. With the use of Saponin, the lowest amount of removal at a concentration of 0.05% equal to 20% has been obtained, while ABTS has been able to remove about 54% of diesel at the highest concentration of surfactant (0.15%), in the continuation of the research A uniaxial test has been conducted to determine the unconfined compressive strength of the soil sample, which shows that the cleaning process increases the compressive strength of the soil by 15%.

کلیدواژه‌ها [English]

  • Electrokinetics
  • Clay
  • Diesel
  • Surfactant
  • Compressive strength

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