Water treatment method and apparatus for water containing oil droplets

A water treating apparatus for treating water, comprising:

• (a) oil drop separator for separating oil drops from water to be treated, comprising
• (1) an electrode in which an anode is made of amphoteric metal,
• (2) a first power source for supplying an electric power to the electrode,
• (3) a first treating tank for housing therein the electrode and the water to be treated,
• (4) a first water inlet through which the water is led to the first treating tank, and
• (5) a first water outlet through which the treated water is exhausted from the first treating tank;
• (b) a three-dimensional fixed bed electrolytic tank for treating the water which has been treated by the oil drop separator, comprising
• (1) a fixed bed electrode,
• (2) a second power source for supplying an electric power in which a polarity is reversed periodically, to the fixed bed electrode,
• (3) a second treating tank for housing therein the fixed bed electrode and the water to be treated,
• (4) a second water inlet through which the water is led to the second treating tank, and
• (5) a second water outlet through which the treated water is exhausted from the second treating tank;
• and
• (c) an element for leading the water exhausted from the first water outlet of the oil drop separating means to the second water inlet of the three-dimensional fixed bed electrolytic tank.