| 摘要 |
<p>A method for treating a waste water from a final washing process in a cationic electrodeposition coating wherein the waste water is received in a receiving/concentrating tank from a final washing tank, the waste water received in the receiving/concentrating tank is supplied to a membrane separation apparatus to separate into a filtrate and a concentrate, and the filtrate is continuously recovered and reused in the final washing process, characterized in that a pH of the waste water is controlled by measuring the pH of the filtrate continuously and adding an acid to the waste water in such a manner that the filtrate has a predetermined range of pH. The method can be employed, in treating a waste water from a final washing process in a cationic electrodeposition coating by using a membrane separation apparatus, for controlling the pH of the waste water continuously with good efficiency and good precision.</p> |
