The present paper has introduced a new electro-coagulation device with a special electrode for removing heavy metal from the sewage water. Since the heavy metal ion in the water is considered as highly toxic, the authors believe it would be of great environmental and industrial value to develop an effective device or method for the above purpose. Compared with the ordinary electro-coagulation one, the present device has such advantages as being highly automatic in control, convenient in use, small in the vo...