Kuraray Co., Ltd.

Tsutomu Miura

Hiroaki Fujii

Yasuhiro Baba

Tsugunori Kashimura

Keiji Matsumura

Goro Kobayashi

Tadao Shiotani

Hidehiko Okabe

Kiichirou Oka

Hiroaki Kuraray Co Ltd Fujii

Goro c/o Kuraray Aqua Co Ltd Kobayashi

Yasuhiro c/o Kuraray Aqua Co Ltd Baba

To provide an inexpensive wastewater treatment method which facilitates downsizing of tanks and requires less withdrawal of an excessive sludge, the use is made of an aeration tankin which wastewater is contacted with a particulate carrier under an aerobic condition, and a total oxidization tankin which the volume of a sludge generated in the aeration tankis reduced under an aerobic condition, a coefficient of self-oxidization of the sludge flowing into the total oxidization tankis set to 0.05 (per day), and the method includes a step of adding a coagulant to the total oxidization tankfor the purpose of improving the solid-liquid separating characteristic of the sludge within the total oxidization tank.

Wastewater treatment method using immobilized carrier

Provided are an apparatus and a method for waste water treatment not generating excessive sludge, for which down-sized tanks are usable. The apparatus comprises an aeration tank where waste water to be treated is kept in contact with carrier particles in an aerobic condition, and a complete oxidation tank. In this, the liquid in the complete oxidation tank is filtered through a separation membrane and the resulting filtrate is discharged out of the system. The s-BOD sludge load to the complete oxidation tank is preferably at most 0.1 kg-BOD/kg-MLSS&middot;day.

Apparatus and method for waste water treatment

Provided are 2-hydroxyphenylbenzotriazol compounds with excellent ultraviolet absorbability and high thermal stability. They can be used as ultraviolet absorber for any polymer.

2-hydroxyphenylbenzotriazol compounds and the use thereof

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Kurashiki, Japan

Tsutomu Miura