Bioleaching of multiple metals from contaminated sediment by moderate thermophiles.
Bioleaching of multiple metals from contaminated sediment by moderate thermophiles.
复制标题
DOI：
10.1016/j.marpolbul.2015.06.040
复制
发表时间：
2015-08
影响因子：
5.8
通讯作者：
M. Gan;Shiqi Jie;Mingming Li;Jianyu Zhu;Xin-xing Liu
中科院分区：
文献类型：
--
作者：
M. Gan;Shiqi Jie;Mingming Li;Jianyu Zhu;Xin-xing Liu
采用中等嗜热菌群对污染底泥中的多种金属进行生物浸出。该复合菌的产酸效率和金属溶解效率均高于纯菌。嗜热菌群的协同作用加速了底物的利用。基质的利用从硫的利用开始，随着pH的下降，开始利用黄铁矿。群落动态表明，A.在整个浸矿过程中，caldus为优势菌，而S.耐热性随黄铁矿利用率的提高而提高。Zn、Cu、Mn和Cd的溶解率分别达到98%、94%、95%和89%，而As、Hg和Pb的溶解率仅为45%、34%和22%。采用Logistic模型对生物浸矿过程进行模拟，拟合度在90%以上。相关性分析表明，金属浸出主要是酸溶过程。分数分析表明，金属的流动性和生物利用度下降。
A moderately thermophilic consortium was applied in bioleaching multiple metals from contaminated sediment. The consortium got higher acidification and metals soubilization efficiency than that of the pure strains. The synergistic effect of the thermophilic consortium accelerated substrates utilization. The utilization of substrate started with sulfur in the early stage, and then the pH declined, giving rise to making use of the pyrite. Community dynamic showed thatA. calduswas the predominant bacteria during the whole bioleaching process while the abundance ofS. thermotoleransincreased together with pyrite utilization. Solubilization efficiency of Zn, Cu, Mn and Cd reached 98%, 94%, 95%, and 89% respectively, while As, Hg, Pb was only 45%, 34%, 22%. Logistic model was used to simulate the bioleaching process, whose fitting degree was higher than 90%. Correlation analysis revealed that metal leaching was mainly an acid solubilization process. Fraction analysis revealed that metals decreased in mobility and bioavailability.