Water treatment apparatus and water treatment method

A water treatment method to be executed in a water treatment apparatus in which a plurality of discharge treatment units are provided in an interior of a treatment tank, the discharge treatment units including a ground electrode and a discharge electrode opposing the ground electrode, and water to be treated is treated by forming a discharge between the ground electrode and the discharge electrode and generating ozone by the discharge, and moreover causing the water to be treated to contact the discharge,

• the water treatment method comprising:
• a step in which the water to be treated, having been treated by one discharge treatment unit of the plurality of discharge treatment units, is collected in the interior of the treatment tank in a water reservoir portion, and
• a step in which the ozone in the treatment tank is supplied to the water to be treated collected in the water reservoir portion, wherein
• the water to be treated is treated by the water to be treated passing through the plurality of discharge treatment units as a continuous flow.