ارزیابی بهسازی زیستی خاک‌های آلوده به روغن موتور

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده مهندسی، دانشگاه فردوسی مشهد

چکیده

مشکلات محیط زیستی ناشی از انتشار آلاینده‌ها در خاک‌، علاوه بر پیامدهای زیست محیطی، تغییرات فراوانی در خواص فیزیکی، شیمیایی و پارامترهای ژئوتکنیکی خاک را به­وجود می‌آورد. از این رو استفاده از روشی مناسب برای بهسازی خاک‌های آلوده همواره مد نظر بوده است؛ به گونه­ای که در دهه اخیر و در پی افزایش تحقیقات در مورد استفاده از روش‌های مختلف زیستی در بهسازی (Improvement) و بهپالایی (Purification) خاک‌ها، از روش رسوب میکروبی کلسیم کربنات (MICP) در حل بسیاری از مشکلات ژئوتکنیکی بهره برده شده است. به همین منظور در این پژوهش، یک نوع خاک ماسه‌ای پس از اختلاط با یک نوع آلاینده هیدروکربنی (روغن موتور) مخلوط و پس از انجام برخی آزمون‌های مکانیک خاک کلاسیک (تراکم، برش مستقیم، تک­محوری و نفوذپذیری) فرآیند بهسازی به دو روش استفاده از محلول باکتری (تزریق دو مرحله‌ای) و اختلاط فلوکه باکتری (Bacterial Flocs)  با تزریق محلول سیمانتاسیون انجام و نتایج بهسازی گزارش شده است. استفاده از آنالیز شیمی تر، SEM و EDS نیز جهت تائید و تفسیر بهتر نتایج آمده است.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Success in Microbial Bio-Improvement of Motor Oil Contaminated Sandy Soils

نویسندگان [English]

  • Mohammad Taghi Bloori Bazaz
  • Jafar Bolouri Bazaz
Civil Engineering Department, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad Iran
چکیده [English]

Given that advances have been made towards the use of carbon-free or low-carbon energy sources in the modern sciences (Simpson and Tatsuoka, 2008), the development and optimization of more environmentally-friendly methods are required. Biological practices have their own sensitivity due to the dealings with living organisms. The feasibility of the use of calcium carbonate precipitation method in the sandy soils contaminated with hydrocarbon pollutants and the use of the bacterial flocculation have been recently investigated (Cheng and Shahin, 2017). The purpose of the present research is to investigate the variation of geotechnical parameters of sandy soils contaminated with motor oil.

کلیدواژه‌ها [English]

  • Hydrocarbon contamination
  • Biological method
  • Bacterial solution
  • Flocculation
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