مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی نقش اکسیژن در بهسازی زیستی عمیق ماسه ورزنه با استفاده از رسوب کربنات کلسیم القایی میکروبی (MICP)

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری ژئوتکنیک، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
2 دانشیار، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
3 دانشیار، گروه مهندسی عمران، دانشگاه صنعتی اصفهان، ایران
4 دانشیار، گروه مهندسی صنایع غذایی،دانشکده کشاورزی دانشگاه آزاد اسلامی واحد خوراسگان (اصفهان)، اصفهان، ایران
چکیده
خاک‌های ماسه‌ای سست در مناطق خشک نظیر ورزنه با چالش‌های فرسایش‌پذیری بالا و مقاومت مکانیکی پایین مواجه هستند. روش رسوب‌گذاری کربنات کلسیم ناشی از میکروارگانیسم‌ها (MICP) یک راهکار زیستی پایدار برای بهسازی خاک محسوب می‌شود. اما کاربرد عمقی این فناوری با مانع اساسی روبروست: باکتری هوازی Sporosarcina pasteurii در اعماق بیش از چند سانتی‌متر به‌دلیل عدم دسترسی به اکسیژن کافی، افت شدیدی در فعالیت متابولیکی و ترسیب کربنات نشان می‌دهد. در پژوهش حاضر، نقش تأمین اکسیژن از طریق هوادهی فعال بر کارایی فرایند بهسازی عمقی (هوای فشرده شامل ۲۱ درصد اکسیژن و اکسیژن با خلوص 5/99 درصد) بررسی شده است. آزمایش‌ها روی ستون‌هایی از ماسه‌ی ورزنه (SP ،D50=0.155 mm) در سه رژیم تیماری انجام شد: تیمار بدون گاز، تیمار همراه با هوای فشرده، و تیمار همراه با اکسیژن خالص. نتایج نشان داد تزریق هوای فشرده مقاومت فشاری محصورنشده (UCS) را تا ۵۰ درصد و تزریق اکسیژن خالص آن را تا بیش از ۱۰۰ درصد نسبت به گروه شاهد افزایش می‌دهد. میانگین کربنات کلسیم رسوب‌کرده در عمق ۳۰-۴۵ سانتی‌متری برای تیمار بدون گاز کمتر از ۱ درصد، برای تیمار هوای فشرده حدود ۴ درصد، و برای تیمار اکسیژن خالص حدود ۷ درصد وزنی بود. تصاویر میکروسکوپ الکترونی روبشی (SEM) نشان داد در حضور اکسیژن بلورهای کلسیت کروی و آگلومره با اتصال مؤثر بین ذرات و در غیاب اکسیژن بلورهای رومبوهدرال پراکنده تشکیل می‌شوند. یافته‌ها نشان می‌دهد که اکسیژن نقش مؤثری در بهسازی عمقی زیستی دارد و شرایط غیراشباع مناطق خشک مزیتی راهبردی برای کاربرد میدانی این فناوری است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigating the Role of Oxygen in Deep Biological Improvement of Varzaneh Sand Using Microbially Induced Calcium Carbonate Precipitation (MICP)

نویسندگان English

Ahmad Najafabadiyan 1
Meysam Bayat 2
Hamid Hashem al Hossini 3
Mahshid Jahadi 4
1 PhD Student, Department of Civil Engineering, Na.C., Islamic Azad University, Najafabad, Iran
2 Associate Professor, Department of Civil Engineering, Na.C., Islamic Azad University, Najafabad, Iran
3 Associate Professor, Department of Civil Engineering, Isfahan University of Technology
4 Associate Professor, Department of Food Science and Technology, Institute of Agriculture, water, Food and Nutraceuticals, Isf.C., Islamic Azad University, Isfahan, Iran
چکیده English

Loose sandy soils in arid regions such as Varzaneh face challenges of high erodibility and low mechanical strength. Microbially induced calcium carbonate precipitation (MICP) is a sustainable bio-based solution for soil improvement. However, deep application of this technology faces a major obstacle: the aerobic bacterium Sporosarcina pasteurii shows a sharp decline in metabolic activity and carbonate precipitation at depths beyond a few centimeters due to insufficient oxygen availability. In the present study, the controlling role of oxygen was investigated through active gas supply (compressed air containing 21% oxygen and pure oxygen with 99.5% purity). Experiments were conducted on columns of Varzaneh sand (SP, D₅₀ = 0.155 mm) under three treatment regimes: treatment without gas, treatment with compressed air, and treatment with pure oxygen. The results showed that injection of compressed air increased the unconfined compressive strength (UCS) by up to 50%, and injection of pure oxygen increased it by more than 100% compared to the control group. The average precipitated calcium carbonate content at a depth of 30–45 cm was less than 1% by weight for the no gas treatment, about 4% for the compressed air treatment, and about 7% for the pure oxygen treatment. Scanning electron microscopy (SEM) images revealed that, in the presence of oxygen, spherical and agglomerated calcite crystals formed with effective interparticle bonding, whereas in the absence of oxygen, scattered rhombohedral crystals were observed. The findings confirm that oxygen plays a decisive role in deep bio improvement of soil, and the unsaturated conditions of arid regions offer a strategic advantage for field application of this technology.

کلیدواژه‌ها English

Oxygen supply
Deep soil improvement
Varzaneh sand
Sporosarcina pasteurii
MICP
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  • تاریخ دریافت 28 خرداد 1405
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  • تاریخ پذیرش 26 تیر 1405