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>Adhesion abilities and biosorption of Cd and Mg by microorganisms - first step for eco-friendly beneficiation of phosphate ore
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Adhesion abilities and biosorption of Cd and Mg by microorganisms - first step for eco-friendly beneficiation of phosphate ore
Chemical reagents used in traditional mineral processing can be toxic and hazardous for the environment. Therefore, the use of biotechnological methods is becoming increasingly important. Great hopes are being placed in the use of microorganisms for bio-beneficiation of raw materials. However, assessment of adhesion abilities of bacteria onto minerals surface as well as biosorption of metals are essential steps before designing final process of each ore beneficiation. The main aim of this work was an investigation of biosorption of Cd and Mg, as well as adhesion abilities of five microorganism species with minerals included in the natural mixture of phosphate ore form Djebel Onk, Algeria. The ore, due to its unique composition, created conditions for adhesion of all five tested microbial strains onto apatite surface during incubation at pH 3. Moreover, Rhodococcus erythropolis CD 130, Pseudomonas fluorescens and Escherichia coli adhered distinctly onto apatite surface during incubation at pH 7. Incubation lasting 20 min at pH 4-6 created the most favorable conditions for biosorption of metals by B. subtilis and adhesion of cells. In case of C. albicans, biosorption of metals as well as adhesion of cells onto the mineral surface were more effective after longer time and in a wider pH range.
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机译：传统矿物加工中使用的化学试剂可能对环境有毒有害。因此，生物技术方法的使用变得越来越重要。利用微生物进行原材料的生物增效被寄予了巨大希望。但是，在设计每种矿石精矿的最终工艺之前，评估细菌对矿物表面的粘附能力以及金属的生物吸附是必不可少的步骤。这项工作的主要目的是研究对Cd和Mg的生物吸附，以及阿尔及利亚Djebel Onk磷酸盐矿的天然混合物中5种微生物与矿物质的吸附能力。矿石由于其独特的成分，为在pH 3孵育期间将所有五个测试微生物菌株粘附到磷灰石表面上创造了条件。此外，在pH 7孵育期间，红球菌Rhodococcus erythropolis CD 130，荧光假单胞菌和大肠杆菌明显粘附在磷灰石表面上。 。在pH 4-6下持续20分钟的孵育为枯草芽孢杆菌生物吸附金属和细胞粘附创造了最有利的条件。在白色念珠菌的情况下，在更长的时间和更宽的pH范围内，金属的生物吸附以及细胞在矿物表面上的粘附更为有效。
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