氧化亚铁硫杆菌对合成沉积物中镉和镍的生物浸出
Bioleaching of cadmium and nickel from synthetic sediments by Acidithiobacillus ferrooxidans.
作者信息
Kim S D, Bae J E, Park H S, Cha D K
机构信息
Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Korea.
出版信息
Environ Geochem Health. 2005 Sep;27(3):229-35. doi: 10.1007/s10653-004-3479-0.
The microbial leaching process was evaluated for the treatment of synthetic sediments contaminated with cadmium and nickel sulfides. A series of batch leaching experiments was conducted to compare metal solubilization in sediment inoculated with Acidithiobacillus ferrooxidans -inoculated sediments to that in sterile control sediment. The rate and extent of metal solubilization were significantly higher in A. ferrooxidans -inoculated reactors than in acidified sterile reactors. The efficiency of cadmium (Cd) solubilization (80) in the bioleaching process was higher than that of nickel (Ni) solubilization (60). The performance of leaching reactors containing only culture supernatants was comparable to that of A. ferrooxidans -inoculated reactors, indicating that indirect non-contact leaching by the products of microbial metabolism is the predominant mechanism for metal solubilization rather than direct microbial sulfide oxidation. Moreover, the similar (60-75%) extents of Cd(2+) leaching with A. ferrooxidans , cell-free filtrate, and Fe(3+) suggest that abiotic oxidation of CdS by Fe(3+) controls the overall leaching rate, and the role of A. ferrooxidans is most likely not to oxidize CdS mineral directly but to regenerate Fe(3+) as an oxidant.
对微生物浸出工艺进行了评估，以处理受硫化镉和硫化镍污染的合成沉积物。进行了一系列分批浸出实验，以比较接种氧化亚铁硫杆菌的沉积物中金属的溶解情况与无菌对照沉积物中金属的溶解情况。在接种氧化亚铁硫杆菌的反应器中，金属溶解的速率和程度显著高于酸化无菌反应器。生物浸出过程中镉（Cd）的溶解效率（80%）高于镍（Ni）的溶解效率（60%）。仅含有培养上清液的浸出反应器的性能与接种氧化亚铁硫杆菌的反应器相当，这表明微生物代谢产物的间接非接触浸出是金属溶解的主要机制，而非直接的微生物硫化物氧化。此外，氧化亚铁硫杆菌、无细胞滤液和Fe(3+)对Cd(2+)的浸出程度相似（60 - 75%），这表明Fe(3+)对CdS的非生物氧化控制了整体浸出速率，氧化亚铁硫杆菌的作用很可能不是直接氧化CdS矿物，而是再生作为氧化剂的Fe(3+)。
Zotero 插件