توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Effect of pretreatment on biosorption of uranium by brown alga in a continuous packed bed column
نویسنده(ها): ، ، ،
اطلاعات انتشار: اولین کنفرانس بین المللی تصفیه فاضلاب و بازیافت آب، فناوری ها و یافته های نو، سال
تعداد صفحات: ۶
Biosorption is an emerging technique in heavy metals removal. In this research, biosorption of uranium (II) from aqueous solution by Cystoseira indica (type of brown alga) biomass and the effect of pretreatment were studied in a continuous packed bed column. The uptake capacity of uranium ions was investigated by natural biomass and different pretreatments. Solutions of HCl (0.1 M) and CaCl2 (0.1 M and pH=2.5, 4, 9.7) has been added to biomass as pretreatment. Also the biosorption mechanism was considered. Experiments were carried out with initial concentration of 0.5 mM, pH=4 and flow rate of 2.3 ml\min at 25 °C. Results show that uptake capacity of uranium ions with natural biomass was 284.06 mg\g. Addition of HCl (0.1 M) and CaCl2 (0.1 M and pH=2.5, 4, 9.7) solutions to biomass change the uptake capacity and uptake capacities were 182.95, 287.21, 371.39 and 359.70 mg\g, respectively. Considering the concentrations of cations proves that ion exchange is the main biosorption mechanisms.<\div>

۲Investigation the effects of pulp density on the uranium bioleaching in stirred tank reactor
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
Uranium bioleaching was carried out with low grade uranium ore from anomaly II of Saghand in Yazd. The bacterial which was used for these experiments was the native strain of Acidithiobacillus ferrooxidans. In these experiments, the effect of pulp density on the efficiency of uranium bioleaching was examined. It is observed that increasing the pulp density cause increasing the lag time of bacterial growth and leaching time and in a given time cause lower uranium extraction. In these experiments the uranium extraction percentage reached to 99% after 7 days for 5% (w\v) pulp density at both agitation speeds of 400 (rpm) and 600 (rpm) and 96% and 97% after 8 and 9 days for 15% (w\v) pulp density at agitation speeds of 400 (rpm) and 600 (rpm), respectively.<\div>
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