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The Role of Membrane Separation in Bioleaching Process
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DOI：10.1080/15422119.2025.2491085.png)
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Abstract
En 中文
Bioleaching is the process in which microorganisms convert solid metals into soluble extractable forms, showcasing a low environmental impact. However, some drawbacks, such as long operational time, low solid content (pulp density), and low metal selectivity, are common in conventional bioleaching procedures. Therefore, this review aims to highlight various membrane techniques that are now being applied to tackle the problems. For example, ceramic membranes can be utilized in the rotating drum reactor to enhance oxygen supply and solid content, lower reaction time by 25%, and increase leaching efficiency by 45%. Membrane bioreactor has a specialized filtration mechanism that exclusively allows dissolved metals to pass from the solution to the other side of the membrane. This process is essential for regulating metal levels, reducing metal toxicity to microorganisms, and enhancing bioleaching rates. Microfiltration membranes can separate >= 99.9% of sludge or ore particles from bioleaching solutions, whereas nanofiltration and reverse osmosis membranes can subsequently separate and concentrate the concentrations of targeted metals and remove up to 99% of the impurities. At last, the challenges and future solutions of membrane stability, fouling, and selectivity are also revealed to increase the future applicability of membranes in bioleaching procedures.
Keywords:
Membrane
bioleaching
separation
purification
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