徐颖
,
谢志钢
,
薛璐
,
冯岳阳
,
陈玉
,
孙瑛
中国有色金属学报
针对氧化亚铁硫杆菌生物(T. f)淋滤法处理重金属污染底泥进行实验研究。采用分批摇床培养方法，分析生物淋滤过程中Fe2+浓度对底泥酸化、微生物生长、Fe2+氧化以及底泥中重金属溶出率的影响；借助Monod方程得到不同Fe2+浓度下氧化亚铁硫杆菌的最大比生长速率及饱和常数；通过经验方程推导出不同Fe2+浓度下重金属离子Cu2+和Zn2+的溶出速率常数。结果表明，当Fe2+浓度由2.0 g/L增加到10.0 g/L时，氧化亚铁硫杆菌的最大比生长速率由0.126 h-1上升到0.159 h-1，饱和常数由0.881 g/L下降到0.327 g/L，重金属的溶出速率常数与Fe2+浓度呈正相关；当Fe2+浓度超过10.0 g/L时，氧化亚铁硫杆菌的最大比生长速率降低，而饱和常数增大。随着Fe2+浓度的增加Fe2+氧化速率增大。综合各个动力学参数可知，Fe2+浓度为10.0 g/L是生物淋滤体系的最佳底物浓度。
关键词:
重金属
,
氧化亚铁硫杆菌
,
生物淋滤
,
动力学
Jianhua LIU
,
Xin LIANG
,
Songmei LI
材料科学技术（英文）
The corrosion behaviors of steel A3 in synergistic action of Thiobacillus ferrooxidans (T.f) and electrochemically accelerated corrosion were studied by electrochemical, microbiology and surface analysis methods. The open circuit potential (Eocp) and electrochemical impedance spectroscopy (EIS) of the steel A3 electrodes were measured in leathen culture medium without and with T.f (simply called T.f solution in the following paper) in immersion electrode way at the time of the 2nd, 5th, 10th, 20th and 30th days, respectively. It was found that Eocp of the electrode for immersion in leathen culture medium shifted negatively with the immersion time while that for immersion in T.f solutions shifted negatively, then positively and finally negatively. On the 20th day, the corrosion of steel A3 for immersion in culture medium was in pitting initiation stage while that for immersion in T.f solutions was in pitting growth stage. It was found that the corrosion of steel A3 was accelerated by T.f. The morphology of corrosion product of steel A3 immersion in T.f solutions observed through scanning electron microscopy (SEM) transformed from solid globules to tabular plates and to spongy globules and plates.
关键词:
Microbiologically influenced corrosion
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