摘要
研究了以中水为循环冷却系统补水的北京某热电厂冷却塔底粘泥中分离富集出来的硫酸盐还原菌（sulfate reducing bacteria,SRB）生长特性。采用原子力显微镜（atomic force microscopy,AFM）和电化学交流阻抗（electrochemical impedence spectroscopy,EIS）方法对比研究了中水环境下,SS304和SS316L不锈钢表面SRB生物膜的生长特征以及不锈钢/生物膜界面电化学行为。结果表明,SS316L不锈钢比SS304对SRB有更强烈的吸附特性,而耐蚀性依然好于SS304。在含SRB的中水中浸泡14 d,SS304和SS316L试片的表面粗糙度分别为（222.95±16.06）nm和（249.68±38.18）nm;去掉生物膜后,SS304试片表面有明显点蚀痕迹,蚀坑最深处为541.24 nm,局部腐蚀速率相当于0.014 mm/a,而SS316L试片表面的蚀坑最深处为49.15 nm,局部腐蚀速率相当于0.001 mm/a。在浸泡后期SS304电极表面钝化膜开始出现点蚀,极化电阻比SS316L的低1~2个数量级。2种不锈钢表面形成SRB生物膜的过程是一个动态平衡过程。
The growth characteristics of sulfate reducing bacteria（SRB）,which was isolated from the slurry of cooling tower in a power plant,in real reclaimed water were studied.The process of bio-film developed on surface of SS304 and SS316L samples immersed in real reclaimed water with SRB,and the electrochemical behavior of interface between samples and bio-film were investigated using atomic force microscopy,（AFM） and electrochemical impedance spectroscopy（EIS）.The results show that this strain of SRB can survive in reclaimed water.Though SS316L exhibits a more intense adsorption to SRB cell,it still has higher resistance to bio-film corrosion of SRB than SS304.After 14d immersion,the surface roughness of SS304 and SS316L was（222.948 ±16.06） nm and（249.682 ±38.18） nm,respectively.Removed the bio-film,the deepest pits of local corrosion on SS304 and SS316L surface was 541.24 nm,with a rate equivalent to 0.014 mm/a and 49.15 nm,with a rate equivalent to 0.001 mm/a,respectively.In late immersion,the polarization resistance of SS304 electrode was lower 1～2 orders of magnitude than SS316L electrode.The development process of bio-film on the surface of SS304 and SS316L samples is a dynamic equilibrium process.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第32期63-70,共8页
Proceedings of the CSEE
关键词
硫酸盐还原菌
中水
生物膜
不锈钢
原子力
显微镜
交流阻抗谱
sulfate reducing bacteria
reclaimed water
bio-film
stainless steel
atomic force microscopy
electrochemical impedance spectroscopy
