US 9,957,170 B2Granted

Water treatment device and water treatment method

AssigneeMitsubishi Electric Corporation

InventorsYasuhiro Nakamura, Yasutaka Inanaga, Akira Morikawa, Tokiko Yamauchi, Takao Tsurimoto, Hirotaka Muto, Gaku Oinuma, Masakazu Taki

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Abstract

A water treatment device generates a bubble in water to be treated inside a treatment tank, and treats the water to be treated through use of radicals that are generated by bubble electric discharge caused via the bubble. The water treatment device includes main electrodes for forming a main discharge area between a first main electrode and a second main electrode, auxiliary electrodes for forming a preliminary discharge area between a first auxiliary electrode and a second auxiliary electrode, and a bubble generator generating a bubble in water to be treated through use of an externally supplied gas. When a bubble generated by the bubble generator passes through the preliminary discharge area, discharge is caused via the bubble, and, when the bubble in an excited state subsequently passes through the main discharge area, the bubble causes discharge again to generate radicals.

Claims14

Dependent claims

A water treatment device for treating water to be treated inside a treatment tank by generating a bubble in the water to be treated and causing discharge through use of the bubble, the water treatment device comprising:

discharge electrodes placed in the water to be treated;
a bubble generating unit having a bubble hole through which an externally supplied gas emerges as a bubble into the water to be treated;
and
a high-voltage power supply,
wherein the bubble contacts at least one of the discharge electrodes placed in the water to be treated to flatten a shape of the bubble generated by the bubble generating unit,
wherein the high-voltage power supply applies a high voltage between the discharge electrodes to form a discharge area in which discharge is caused inside the bubble, and
wherein the flattened bubble is emitted into the discharge area
wherein a longitudinal axis of the bubble hole faces a wall surface of or an end of the at least one of the discharge electrodes and a gap is provided between the bubble hole and the at least one of the discharge electrodes, and the bubble contacts the wall surface of, or at the end of, the at least one of the discharge electrodes that the bubble hole faces.

5 more elements

Dependencies are inferred from the claim text.