ویرایش مقاله انگلیسی ISI
هشت سال پیش منتشر شده
تعداد بازدید: 548
کد پروژه: 70966
شرح پروژه
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Abstract
This research was carried out to remove iron from kaolin by biological method by strains of Bacillus bacteria and mixture of fungal and bacteria and comparing them with the control sample. The experiments were carried out for Bacillus bacteria at 30 ̊C and 25 ̊C and for mixture of fungal and bacteria at 27 ̊C. For samples of treated with Bacillus bacteria, with increasing temperature, the concentrations of citric acid, oxalic acid and dissolved iron, and consequently glucose consumption is also increased but the PH changes did not change much with temperature rise. The results of XRF measurements of these samples at 25 ̊C and 30 ̊C, show 31.1% and 37% decrease in Fe2O3 and Fe content, respectively. This is also consistent with the results of measurements of iron, oxalic acid and citric acid. Therefore, the amount of iron removal by bacteria is higher at higher temperatures. However, XRF results of kaolin powders treated with fungal and bacterial mixtures show 49% reduction in iron content after 14 days of treatment. The results of measurement of kaolin powder color treated with a mixture of fungal and bacteria showed more L*compared to other samples. So that it's a* is 3.96 and its b* is 12.03, representing a decrease of 27.6% and 25.2%, respectively.)
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