中空纤维膜传质H2对氧化亚铁硫杆菌还原溶解黄钾铁矾类矿物的影响

为强化氧化亚铁硫杆菌厌氧还原溶解黄钾铁矾类矿物过程中的H₂传质，以2种典型中空纤维膜(无泡出气与微气泡出气)搭建中空纤维膜反应器，研究中空纤维膜传质H₂对氧化亚铁硫杆菌厌氧还原溶解黄钾铁矾类矿物的影响。结果表明，采用无泡出气中空纤维膜，黄钾铁矾类矿物最大还原溶解速率为5.82 mmol·(L·d)⁻¹，16 d后黄钾铁矾类矿物还原溶解量达到86.6%；而采用微气泡中空纤维膜，黄钾铁矾类矿物最大还原溶解速率为3.18 mmol·(L·d)⁻¹，16 d后黄钾铁矾类矿物还原溶解量仅达到53.9%。进一步地，无泡出气中空纤维膜相比微气泡出气中空纤维膜，在显著降低H₂消耗的同时，能够让氧化亚铁硫杆菌更易获取H₂，进而分泌更多胞外有机物，提高浸出效率。本研究结果可为无泡出气中空纤维膜在氧化亚铁硫杆菌还原溶解黄钾铁矾类矿物的应用提供参考。

Effect of H2 mass transfer by hollow fiber membrane on anaerobic bio-dissolution of jarosites using Acidithiobacillus ferrooxidans

To improve the H2 mass transfer during the jarosites anaerobic reduction dissolution process by Acidithiobacillus ferrooxidans, two typical hollow fiber membranes, including bubble free type and microbubble type as research objects, and the characteristics of anaerobic reduction dissolution of jarosites by Acidithiobacillus ferrooxidans in the hollow fiber membrane reactor were studied. The results showed that the maximum reduction dissolution rate of jarosites was 5.82 mmol·(L·d)−1 using the bubble free type of hollow fiber membrane, and the anaerobic reduction dissolution amount of jarosites reached 86.6% after 16 days. However, the maximum reduction dissolution rate of jarosites was 3.18 mmol·(L·d)−1 when using the microbubble type of hollow fiber membrane, and the anaerobic reduction dissolution amount of jarosites only reached 53.9%. Furthermore, compared with the microbubble type of hollow fiber membrane, the H2 consumption of reduction bio-dissolution process was reduced when using the bubble free type of hollow fiber membrane, and made it easier for Acidithiobacillus ferrooxidans to get H2 and secreted more extracellular organic matter. The results of this study can provide a reference for the application of bubble free type of hollow fiber membrane in the reduction and dissolution of jarosites by Acidithiobacillus ferrooxidans.