嗜酸氧化亚铁硫杆菌固定于纱布上用于废弃印刷电路板的生物浸出
Immobilization of Acidithiobacillus ferrooxidans on Cotton Gauze for the Bioleaching of Waste Printed Circuit Boards.
作者信息
Nie Hongyan, Zhu Nengwu, Cao Yanlan, Xu Zhiguo, Wu Pingxiao
机构信息
School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou, 510006, China.
出版信息
Appl Biochem Biotechnol. 2015 Oct;177(3):675-88. doi: 10.1007/s12010-015-1772-2. Epub 2015 Aug 4.
The bioleaching parameters of metal concentrates from waste printed circuit boards by Acidithiobacillus ferrooxidans immobilized on cotton gauze in a two-step reactor were investigated in this study. The results indicated that an average ferrous iron oxidation rate of 0.54 g/(L·h) and a ferrous iron oxidation ratio of 96.90 % were obtained after 12 h at aeration rate of 1 L/min in bio-oxidation reactor. After 96 h, the highest leaching efficiency of copper reached 91.68 % under the conditions of the content of the metal powder 12 g/L, the retention time 6 h, and the aeration rate 1 L/min. The bioleaching efficiency of copper could be above 91.12 % under repeated continuous batch operation. Meanwhile, 95.32 % of zinc, 90.32 % of magnesium, 86.31 % of aluminum, and 59.07 % of nickel were extracted after 96 h. All the findings suggested that the recovery of metal concentrates from waste printed circuit boards via immobilization of A. ferrooxidans on cotton gauze was feasible.
本研究考察了在两步反应器中，固定在纱布上的氧化亚铁硫杆菌对废弃印刷电路板金属精矿的生物浸出参数。结果表明，在生物氧化反应器中，通气速率为1 L/min，12 h后亚铁平均氧化速率为0.54 g/(L·h)，亚铁氧化率为96.90%。96 h后，在金属粉末含量12 g/L、停留时间6 h、通气速率1 L/min的条件下，铜的最高浸出效率达到91.68%。在重复连续分批操作下，铜的生物浸出效率可高于91.12%。同时，96 h后锌的浸出率为95.32%，镁为90.32%，铝为86.31%，镍为59.07%。所有结果表明，通过将氧化亚铁硫杆菌固定在纱布上来回收废弃印刷电路板中的金属精矿是可行的。
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