بررسی قابلیت باکتری Sporsarcina Pasteuri در بهسازی و بهپالایی خاک‌های آلوده هیدروکربنی

نوع مقاله : پژوهشی

نویسندگان

1 دانشکده مهندسی، دانشگاه فردوسی مشهد.

2 دانشکده مهندسی، دانشگاه فردوسی مشهد

چکیده

 در قرن حاضر استفاده از فرآورده های مختلف نفت و سوخت های فسیلی به عنوان جزء غیرقابل تفکیک از صنعت و پیشرفت‌های بشری بوده است. آنچه امروز به عنوان یک دغدغه مهم در کنار استفاده از این فرآورده‌ها مطرح است، انتشار غیرقابل کنترل آنها در قسمت‌‌های مختلف مانند استحصال، فرآوری، انتقال و استفاده است. سایر مشکلات استفاده از این فراورده ها، آلودگی‌های زیست محیطی و بوجود آوردن خاک‌های مسئله دار آلوده در حوزه مهندسی ژئوتکنیک است. راه کار‌های زیادی برای حل جداگانه این مشکلات بررسی و ارائه شده است؛ در پژوهش حاضر استفاده از روش بهسازی میکروبی MICp ( Microbiologically induced calcium carbonate precipitation) به عنوان راه حلی برای بهپالایی خاک‌های آلوده و بهبود ظرفیت باربری کاهش یافته آن با دو فرآورده نفتی گازوئیل و روغن موتور ارائه شده است. باکتری مورد استفاده در این فرآیند Sporsarcina pasteuri بوده که بصورت فلوکه (flocculate) باکتری به خاک آلوده اضافه شده و سپس طی دو مرحله ارزیابی بهپالایی (با استفاده از نتایج کروماتوگرافی) و بهسازی ژئوتکنیکی (با استفاده از نتایج آزمون برش مستقیم و نفوذپذیری) انجام شد. با کمک آنالیز FTIR (Fourier-transform infrared spectroscopy) و بررسی نمودارهای کروماتوگرافی، کاهش پیک های اجزای شناسایی شده در نمونه تیمار شده نسبت به نمونه استاندارد تهیه شده از گازوئیل یا روغن موتور ملاحظه شدند. از طرفی بهبود خواص ژئوتکنیکی خاک‌های آلوده از مهمترین اثرات ملاحظه شده در نمونه‌های تیمار شده بود.

کلیدواژه‌ها

عنوان مقاله [English]

An Investigation into the Capability of Sporsarcina Pasteuri on Improvement and Refinement of Contaminated Hydrocarbon Soils

نویسندگان [English]

  • Mohammad Taghi Bolouri Bazaz 1
  • J. Bolouri Bazzaz 2
  • Seyyed Mohsen Karrabi 1
1 Civil Engineering Department, Ferdowsi University of Mashhad, Mashhd, Iran.
2 Civil Engineering Department, Ferdowsi University of Mashhad, Mashhd, Iran.
چکیده [English]

In the present century, the use of various petroleum products and fossil fuels has been an integral part of industry and human progress. Nowadays the major concern, in addition to the use of petroleum products, is their uncontrolled diffusion in various parts such as extraction, processing, transfer and use. The other problem with the utilization of these products has arisen in the field of geotechnical engineering includes environmental pollution and the creation of problematic contaminated soils. Many solutions to these problems have been investigated and presented separately. In the present study, the microbiologically induced calcium carbonate precipitation (MICP) method, as a solution to purify contaminated soils and to improve its reduced bearing capacity with two petroleum products, diesel and engine oil, has been proposed. The bacterium used in this process was Sporsarcina pasteuri, which was added to the contaminated soil as a flocculate bacterium. In two stages; purification evaluation (using chromatographic results) and geotechnical improvement (using direct shear and permeability test results) were performed. With the aid of FTIR (Fourier-transform infrared spectroscopy) analysis and chromatographic diagrams, a reduction of peaks of the identified components in the treated sample in comparison to the standard sample (prepared from diesel or engine oil) was observed. On the other hand, improving the geotechnical properties of contaminated soils was one of the most important effects observed in the treated samples.

کلیدواژه‌ها [English]

  • Environmental pollution
  • Improvement
  • Refinement
  • Sporsarcina pasteuri
  • Chromatography and FTIR

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