Abstract：The sludge from printed circuit board (PCB) industry was treated harmlessly by the bioleaching method. In the experiment, Acidithiobacillus ferrooxidans (hereafter abbreviated as A.f), which was selected from the copper mine, was used in the bioleaching process. For the original state of the strain, the effect of leaching time, pH value, acclimation period, solid-to-liquid ratio, concentration of ferrous sulfate on bioleaching valuable metals from the sludge were investigated. The results showed that high concentrations of heavy metals in the solution would inhibit the leaching rate of metals by the strain when the solid-to-liquid ratio exceeded 1:20. But the tolerance of the strain could enhance through the continuous acclimation. With a five cycles of continuous domestication for the strain in the bioleaching solution, the ability of the strain leaching metals from the sludge was improved significantly. Leaching rates of Cu, Ni and Zn from the sludge could reach 78%, 53% and 74% respectively under the optical conditions, which were FeSO4?7H20concentration of 60g/L, pH value of 0.5, extraction time of 6days, ratio of solid-to-liquid of 1:10in 9K medium. So the environmentally friendly method would provide support for the PCB industry.
李东明, 白建峰, 张承龙, 戴珏, 苑文仪, 邓明强, 毛文雄, 王景伟. 嗜酸氧化亚铁硫杆菌处理线路板行业污泥的无害化[J]. 中国环境科学, 2015, 35(7): 2079-2086.
LI Dong-Ming, BAI Jian-Feng, ZHANG Cheng-Long, DAI Jue, YUAN Wen-Yi, DENG Ming-Qiang, MAO Wen-Xiong, WANG Jing-Wei. Harmless research of printed circuit board sludge by Acidithiobacillus ferrooxidans. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(7): 2079-2086.
