Water treatment apparatus and water treatment method

A water treatment method to be applied to a water treatment apparatus including:

• a plurality of ground electrodes arranged sequentially in a vertical direction in an interior of a treatment tank;
• and
• a plurality of discharge electrodes, each provided in respective gaps formed between a lower surface of the ground electrode on an upper side and an upper surface of the ground electrode on a lower side of two of the ground electrodes arranged consecutively in the vertical direction,
• the plurality of ground electrodes being arranged such that upper surfaces of two of the ground electrodes arranged consecutively in the vertical direction are alternately inclined in opposite directions with respect to a horizontal plane,
• the water treatment method comprising:
• a step in which a first discharge is formed in air between the lower surface of the ground electrode on the upper side and the discharge electrode by applying a voltage to each of the plurality of discharge electrodes,
• a step in which a second discharge is formed in air between the upper surface of the ground electrode on the lower side and the discharge electrode by applying a voltage to each of the plurality of discharge electrodes, and
• a step in which water to be treated is treated by causing the water to be treated that has been supplied from the upper part of the treatment tank to continuously flow downward from the ground electrode of an uppermost part to the ground electrode of a lowermost part along the respective upper surfaces, and pass through the gaps in which the first discharge and the second discharge are formed.