嗜酸氧化亚铁硫杆菌处理线路板行业污泥的无害化

研究了一株用于浸出线路板中Cu的嗜酸性氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans简称:A.f菌)在高固液比下无害化处理线路板污泥的影响.实验以A.f菌为原始菌种,通过周期性的驯化培养,在不同的浸出条件下探究了生物浸出时间、培养基pH值、菌种驯化周期、固液比和硫酸亚铁浓度等因素对A.f菌浸出线路板行业污泥中有价金属的影响.结果表明:当固液比高于1:20时,溶液中高浓度的重金属对微生物浸出有抑制作用,但通过连续的驯化培养可以提高菌种的耐受性,在FeSO4·7H2O投加量为60g/L、9k培养基初始pH为0.5、浸出时间为6d、固液比为1:10的条件下, Cu、Ni和Zn的浸出率可达:78%、53%和74%.

Harmless research of printed circuit board sludge byAcidithiobacillus ferrooxidans

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.