Kuraray Co., Ltd.

Goro Kobayashi

Hiroaki Fujii

Yasuhiro Baba

Hidehiko Okabe

Lorne M Golub

Thomas F McNamara

Tetsuo Takigawa

Akio Fujita

Robert A Greenwald

Nangavarum S Ramamurthy

Hisashi Iwata

Tsutomu Miura

Tsutomu Kawai

Michiya Shimamura

Takashi Hamasaki

Provided is a hydrogel-forming composition capable of forming a sterilized hydrogel having a high mechanical strength. Also provided are a hydrogel using the hydrogel-forming composition, and a method for producing the hydrogel-forming composition. The hydrogel-forming composition contains a vinyl alcohol polymer having an ethylenically unsaturated group and having a polymerization degree of 450 or more, in which the ethylenically unsaturated group introduction ratio is 0.01 to 10 mol % in all the structural units constituting the vinyl alcohol polymer, and in which no microorganisms detectable by the sterility test method (direct method) specified in the general test methods of the Japanese Pharmacopoeia are present.

Composition for forming hydrogel, hydrogel, and method for producing composition for forming hydrogel

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

A method of wastewater treatment that reduced equipment cost and running cost and realizes high efficiency implementation and further tank miniaturization, and that reduces excess sludge withdrawal. There is provided a method of wastewater treatment with excess sludge withdrawal reduced, characterized in that there are installed an aeration tank wherein wastewater is brought into contact with carrier particles under aerobic conditions, a total oxidization tank and a sedimentation tank, and that operation is made while maintaining the BOD sludge load in the total oxidization tank at 0.08 kg-BOD/Kg-MLSS*day or smaller, and that a coagulant is charged in the complete oxidization tank in order to improve the setting in the sedimentation tank.

Method of wastewater treatment with excess sludge withdrawal reduced

Provided is a method of treating humans or animals suffering from a condition or disease characterized by excessive collagen destruction, which comprises administering to said human or animal an effective amount of a 12a-deoxytetracycline represented by the following general formula ##STR1## The method is effective in the treatment of various articular diseases characterized by excessive collagen destruction.

Method to reduce connective tissue destruction

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Chuo-ku, Japan

Goro Kobayashi