A CDI water treatment apparatus according to the present invention comprises filter means for purifying raw water by a CDI system via an electrode section formed by alternately laminating electrodes and a separator and a filter means provided at the front end of the filter means, And sterilizing means for supplying sterilizing substances produced in the raw water to the electrode portion for sterilizing the sterilizing agent. At this time, it is preferable that the sterilizing means does not purify the raw water at the electrode portion, and further operates after a predetermined time elapses without regenerating the electrode at the electrode portion.本発明に係るCDI方式の水処理装置は、電極とセパレーターが交互に積層されて形成される電極部を介してCDI方式で原水を浄水するフィルター手段、及びフィルター手段の前端に設けられ、電極部を殺菌するために原水で生成させた殺菌物質を電極部へ供給する殺菌手段を含む。このとき、殺菌手段は、電極部で原水を浄水せず、さらに、電極部で電極を再生しないままで所定の時間が経過した後に作動することが好ましい。
