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首页> 外文期刊>Journal of Bioscience and Bioengineering >Adaptation of a mixed culture of acidophiles for a tank biooxidation of refractory gold concentrates containing a high concentration of arsenic
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Adaptation of a mixed culture of acidophiles for a tank biooxidation of refractory gold concentrates containing a high concentration of arsenic

机译：嗜酸菌的混合培养物适于高浓度砷难处理金精矿的罐式生物氧化

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摘要

We adapted a mixed culture of acidophiles to high arsenic concentrations to confirm the possibility of achieving more than 70% biooxidation of refractory gold concentrates containing high arsenic (As) concentration. The biooxidation process was applied to refractory gold concentrates containing approximately 139.67 g/kg of total As in a stirred tank reactor using an adapted mixed culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. The percentage of the biooxidation process was analyzed based on the total As removal efficiency. The As removal was monitored by inductively coupled plasma (ICP) analysis, conducted every 24 h. The results obtained with the adapted culture were compared with the percentage of biooxidation obtained with a non-adapted mixed culture of A. ferrooxidans and A. thiooxidans, and with their respective pure cultures. The percentages of biooxidation obtained during 358 h of reaction were 72.20%, 38.20%, 27.70%, and 11.45% for adapted culture, non-adapted culture, and pure cultures of A. thiooxidans and A. ferrooxidans, respectively. The adapted culture showed a peak maximum percentage of biooxidation of 77% at 120 h of reaction, confirming that it is possible to obtain biooxidation percentages over 70% in gold concentrates containing high As concentrations. (C) 2015, The Society for Biotechnology, Japan. All rights reserved.
机译：我们对嗜酸菌的混合培养物进行了调整，使其适应高砷浓度，以确认实现含高砷（As）浓度的难熔金精矿的70％以上生物氧化的可能性。使用氧化亚铁硫杆菌和硫代酸硫杆菌的合适的混合培养物，在搅拌釜反应器中将生物氧化工艺应用于含砷总量约为139.67 g / kg的难熔金精矿。基于总的As去除效率来分析生物氧化过程的百分比。每24小时通过电感耦合等离子体（ICP）分析监测砷的去除。将通过适应性培养获得的结果与通过非适应性铁氧化拟南芥和硫代氧化拟南芥的混合培养及其各自的纯培养获得的生物氧化百分比进行比较。在358 h反应中获得的生物氧化百分比分别为：适应性培养，不适应性培养和纯氧化菌A. thiooxidans和A. ferrooxidans的72.20％，38.20％，27.70％和11.45％。适应的培养物在反应120 h时显示出77％的最大生物氧化峰值，这证实了在含有高As浓度的金精矿中可以获得70％以上的生物氧化百分比。 （C）2015年，日本生物技术学会。版权所有。

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