摘要
The adsorption and leaching of chalcopyrite by two extreme thermophilic archaea(A.brierleyi and S.metallicus)and their mixture were studied.The results revealed that the chalcopyrite leaching rate of S.metallicus was slightly higher than that of A.brierleyi;the mixed system showed the highest rate.Community structure analysis during the leaching process showed that S.metallicus was maintained in a predominant state.However,the proportion of A.brierleyi in the community increased during leaching.Copper concentrations,which increased faster in the mixed system than in the single-organism systems during later stages,was related to the change of A.brierleyi in the community.Langmuir parameter analysis revealed no competitive adsorption between these two thermophilic archaea.Furthermore,qPCR(quantitative polymerase chain reaction)confirmed that adsorption was promoted between A.brierleyi and S.metallicus during mixed leaching.These findings can improve our understanding of the adsorption behaviors of mixed extreme microbial populations on mineral surfaces.
研究两株具有代表性的极端嗜热古菌A. brierleyi和S. metallicus及其混合物对黄铜矿的吸附和浸出行为。结果表明,S.metallicus的铜浸出率略高于A.brierleyi的,其中混合菌体系的铜浸出率最高。浸出过程中的群落结构分析表明,S. metallicus在菌群中属于优势菌群;A. brierleyi所占比例呈现上升趋势,而这一上升趋势与黄铜矿在混合体系浸出后期的铜浓度比在单菌体系增长更快有关。Langmuir参数分析得出两种古菌之间不存在竞争性吸附关系,而qPCR结果显示,在混合浸出的过程中,S. metallicus和A. brierleyi之间会产生促进性吸附。本研究进一步阐明混合极端嗜热菌在矿物表面上所发生的吸附行为。
基金
Project (51774342) supported by the National Natural Science Foundation of China
Project (2016RS2016) supproted by the Hunan Provincial Science and Technology Leader (Innovation Team of Interface Chemistry of Efficient and Clean Utilization of Complex Mineral Resources),China
