论文部分内容阅读
再生水回用是缓解我国水资源危机的有效途径。然而由于再生水营养丰富,微生物大量繁殖成为其回用的关键问题。从以再生水作为补充水源的3倍循环冷却水中分离纯化出硫酸盐还原菌(SRB),在实验室条件下,采用环境扫描电镜(SEM)、原子力显微镜(AFM)、线性极化电阻、极化曲线、电化学阻抗谱(EIS)等方法研究了SRB对Q235碳钢的腐蚀行为。结果表明,浸泡初期SRB生物膜抑制碳钢的腐蚀,随后促进碳钢的腐蚀,表现为点蚀,随着浸泡时间的延长,腐蚀速率逐渐下降并趋于稳定,但碳钢表面的粗糙度和腐蚀坑深却逐渐增大。7 d时碳钢表面形成完整的生物膜,随后扩散作用成为电极反应控制的主导。
Recycled water reuse is an effective way to alleviate the crisis of water resources in our country. However, due to the nutrient-rich reclaimed water, the multiplication of microorganisms has become a key issue for its reuse. Sulfate-reducing bacteria (SRB) were isolated and purified from three times of circulating cooling water with reclaimed water as the supplementary water source. Under the laboratory conditions, the samples were characterized by means of environmental scanning electron microscopy (SEM), atomic force microscope (AFM), linear polarization resistance Curve, electrochemical impedance spectroscopy (EIS) and other methods to study the SRB Q235 carbon steel corrosion behavior. The results showed that SRB biofilm inhibited the corrosion of carbon steel and then promoted the corrosion of carbon steel, which was pitting corrosion. With the prolongation of soaking time, the corrosion rate gradually decreased and stabilized, but the surface roughness of carbon steel and Pit corrosion depth but gradually increased. On the 7th day, a complete biofilm formed on the surface of carbon steel, then the diffusion became the dominant factor in the control of electrode reaction.