Mitsubishi Heavy Industries Limited

Masanori Tabata

Shintaro Honjo

Kozo Iida

Yasuhiro Takeuchi

Makoto Susaki

Masaru Chiyomaru

Kenichi Okada

Tetsuya Ito

Hiroyuki Nakamura

Yukiko Shirakusa

Kazuhide Kamimura

A wastewater treatment apparatus () that treats the wastewater containing persistent substances, according to the present invention, includes a wastewater treatment bath () for treating a wastewater (), an oxidizing reagent adding unit () for adding an oxidizing reagent () in the wastewater treatment bath (), and an alkaline reagent adding unit () for adding an alkaline reagent () in the wastewater treatment bath (). By making the wastewater in the wastewater treatment bath () in the alkaline condition, it is possible to completely decompose the persistent substances in the wastewater by the oxidation treatment using an oxidizing reagent.

Wastewater treatment apparatus

The present invention provides an exhaust gas treatment method including oxidation treatment for converting metallic mercury contained in combustion exhaust gas into mercury chloride; and mercury removal treatment for removing mercury from the combustion exhaust gas by dissolving the mercury chloride in water, wherein a plurality of oxidation catalysts for performing the oxidation treatment are provided, and during the time when the oxidation treatment is performed, at least one of the oxidation catalysts performs catalyst performance restoration treatment without performing oxidation treatment. According to the present invention, the deterioration in mercury removal performance can be restrained even in continuous operation on condition that mercury is oxidized in a low temperature region not higher than 300&#xb0; C.

Exhaust gas treatment method, exhaust gas treatment system, and catalytic oxidation apparatus

Growing community of inventors

Hiroshima-ken, Japan

Masanori Tabata