Abstract:

The electrocoagulation technology has advantages such as high efficiency, no need for adding chemicals, no secondary pollution, simple operation and equipment maintenance. However, there are issues such as unclear electrochemical performance patterns of the electrode plates. This article used polarization curve method to study the electrochemical performance of sacrificial anodes, and carried out experimental researches on the influences of different initial salt mass concentrations, pH, and oil mass concentrations on the electrochemical performance of sacrificial anodes. The results showed that the passivation current density increased, the potential range of the anode passivation zone narrowed, and the dissolution rate of the anode surface increased with the inceasing mass concentration of sodiur chloride solution; when the initial pH was too small or too large, the anodic dissolution rate increased, and the destruction of passivation film was enhanced; the increase in initial oil mass concentrations had little effect on the electrochemical properties of the aluminum anode and did not affect the dissolution rate of the anode. The research conclusion provides a theoretical basis and scientific basis for the application of electrocoagulation technology in emergency response to marine oil spills.

Key words: oily sewage, polarization curve method, aluminum anode, electrochemical performance

摘要：

电絮凝技术具备效率高、无需添加药剂、无二次污染、设备操控和维护简单等优势，但存在极板电化学性能变化规律不明晰等问题。利用极化曲线法研究牺牲阳极的电化学性能，针对不同氯化钠含量、不同初始pH、不同含油浓度对牺牲阳极电化学性能的影响特性开展了实验研究，结果发现：随着污水中氯化钠质量浓度的不断增大，致钝电流密度不断增大，阳极钝化区电位范围变窄，阳极表面溶解速率增大；污水初始pH过小或过大，阳极溶解速率都增大，钝化膜破坏作用都增强；污水中初始含油质量浓度的增大对铝阳极电化学性质变化影响不大，不影响阳极的溶解速率，为电絮凝技术用于海洋溢油应急处置提供了理论基础和科学依据。

关键词: 含油污水, 极化曲线法, 铝阳极, 电化学性能

CLC Number: 

• X703