نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده ی مهندسی شیمی، دانشگاه سمنان، صندوق پستی: 3513119111، سمنان ـ ایران

2 پژوهشکده ی چرخه ی سوخت هسته ای، پژوهشگاه علوم و فنون هسته ای، سازمان انرژی اتمی، صندوق پستی: 8486-11365، تهران ـ ایران

3 گروه مهندسی شیمی، دانشکده ی مهندسی، دانشگاه مازندران، کدپستی: 47415، بابلسر ـ ایران

چکیده

با استفاده از یک زیست رآکتور هوا- بالارونده با حلقه جریان داخلی و با به کارگیری باکتری اسیدی تیوباسیلوس فرواکسیدان و سنگ معدن اورانیم آنومالی 2 ساغند، اکسایش میکروبی آهن فرو، هنگام استخراج اورانیم بررسی شد. برای پیش‌بینی سینتیک اکسایش میکروبی، مدل‌های مونود و مدل‌های اصلاح شده برای بازدارندگی محصول و ماده‌ی اصلی در نرخ‌های هوادهی مختلف مورد استفاده قرار گرفت. طبق نتایج به دست آمده بیش‌ترین مقدار استخراج اورانیم با باکتری برابر با %1/97 و بدون باکتری برابر با %21 بود. برازش داده‌های تجربی با مدل‌های پیش‌گفته نشان داد که در تمام نرخ‌های هوادهی در رآکتور، مدل اصلاح شده برای بازدارندگی ماده‌ی اصلی تطابق بیش‌تری با داده‌های تجربی داشت و مقدار 2R در نرخ‌های هوادهی 0065/0، 0085/0، 01/0 و 015/0 متر بر ثانیه، به ترتیب، برابر با 98/0، 97/0، 94/0 و 94/0 محاسبه شد.
 

کلیدواژه‌ها

عنوان مقاله [English]

Kinetics of Microbial Oxidation in Uranium Bioleaching at an Internal Loop Air-Lift Bioreactor

نویسندگان [English]

  • Mohammadreza Zolala 1
  • SeyedJaber Safdari 2
  • Ali Haghighi-Asl 1
  • Abbas Rashidi 3

چکیده [English]

To study microbial oxidation of ferrous ions through the uranium bioleaching process, experiments were carried out in the internal loop air-lift reactor by Acidithiobacillus ferrooxidans. The microbial oxidation kinetics was evaluated with the Monod correlation and modified models for the substrate and product inhibition. The maximum recovery of uranium in the biological and control tests were 97.1% and 21%, respectively. Evaluation of the experimental data with the mentioned models showed that the modified model for the substrate inhibition gave a good fitting for all aeration rates. The R2-values were found to be 0.98, 0.97, 0.94 and 0.94 for the air superficial velocity of 0.0065, 0.0085, 0.01 and 0.015 m/s, respectively.

کلیدواژه‌ها [English]

  • Bioleaching
  • Uranium
  • Air-Lift Reactor
  • Microbial Oxidation
  • Kinetics
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