Abstract

Research into radionuclide leaching behavior in the treatment of low-level radioactive waste solidification has been a widespread concern. Bioleaching of uranium was carried out using Aspergillus sulphureus isolated from El-Sella ore material. This area is located in the southern eastern desert of Egypt. The maximum bioleaching of U(VI) was found to be 83.1 % at these optimum conditions: 9 days incubation period, 0.5% pulp density, 30 °C incubation temperature at shaking speed 175 rpm. Glucose and NH4Cl were considered the best carbon and nitrogen sources for fungal growth through direct bioleaching process. A. sulphureus exhibits good potential in generating varieties of organic acids which effective for bioleaching of uranium. It produced 45.2 and 17 µg/ml from gallic and ellagic acids, respectively in the culture filtrate under the optimum conditions. This work represented the environmental technology for leaching of uranium where this is method is more save and low cost.

摘要

研究放射性核素在低放射性废物固化处理中的浸出行为一直受到广泛关注。铀的生物浸出是使用从 El-Sella 矿石材料中分离出来的硫曲霉进行的。该地区位于埃及东南部的沙漠中。在以下最佳条件下发现 U(VI) 的最大生物浸出率为 83.1%：9 天孵育期、0.5% 纸浆密度、30°C 孵育温度和 175 rpm 振荡速度。葡萄糖和 NH4Cl 被认为是通过直接生物浸出过程进行真菌生长的最佳碳源和氮源。硫黄曲霉在产生多种有机酸方面表现出良好的潜力，这些有机酸对铀的生物浸出有效。它在最佳条件下的培养滤液中分别从没食子酸和鞣花酸中产生 45.2 和 17 µg/ml。该工作代表了该方法更节约、成本更低的铀浸出环保技术。