Microbially Assisted Leaching of Uranium—A Review

The review evaluates microbially assisted leaching (bioleaching) of uranium within the broader context of hydrometallurgical methods. The prevalent challenges in these methods include poor recovery rates, high costs, and increased pollution levels. Utilizing microorganisms to facilitate uranium recovery demonstrates a promising approach to overcome these limitations, enabling the oxidation and reduction of uranium and related metals, thus influencing their environmental mobility. This review synthesizes findings from various studies that compare bioleaching and conventional acid leaching processes, highlighting the slower kinetics associated with bioleaching yet emphasizing its advantages, such as reduced contamination from unwanted microorganisms. Key factors affecting bioleaching efficiency, including pH and the presence of specific microbial strains, are critically analyzed alongside industrial applications, particularly in regions like India. Additionally, the historical development of bioleaching technologies, including the first commercial tank bioleaching plant, is discussed, underscoring the necessity for concerted research efforts to enhance uranium bioleaching methodologies. The conclusion advocates for bioleaching as a feasible, eco-friendly, and economically attractive alternative for sustainable uranium recovery. An in-depth understanding of microbial interactions and environmental conditions is essential for optimizing these processes.