Kabushiki Kaisha Toshiba

Yoshinari Takamatsu

Tatsuaki Sato

Masumitsu Toyohara

Masami Enda

Yumi Yaita

Hitoshi Sakai

Ichiro Inami

Norihisa Saito

Tetsuya Noda

Hiromi Aoi

Masaru Okamoto

Shinya Miyamoto

Satoshi Hiraragi

Noriko Suzuki

Chemical decontamination method of dissolving oxide film adhered to contaminated component including, preparing decontamination solution in which ozone is dissolved and oxidation additive agent, which suppresses corrosion of metal base of the contaminated component, is added, and applying the decontamination solution to the contaminated component, thereby to remove the oxide film by oxidation.

Method for treating a chemical decontamination solution

The present invention provides a method and an apparatus for treating boron-containing waste, which prevent clogging of a waste liquid line, achieve an increase in feeding of a waste liquid to a dryer, make in-drum mixing feasible, and increase the strength of a cement solidification product. A method for treating a boron-containing waste liquid comprises the step of adding an alkali metal element compound and an alkali earth metal element compound to the boron-containing waste liquid, and the step of then drying and powdering the boron-containing waste liquid, wherein the temperature of the boron-containing waste liquid during a period from addition of either the alkali metal element compound or the alkali earth metal element compound until the drying and powdering is maintained at not lower than the precipitation temperature of a compound containing boron and an alkali metal and a compound containing boron and an alkali earth metal.

Method for treating boron-containing waste

Raw material of algae cultivating medium molded body is manufactured by mixing a mixture containing inorganic material, curing material and algae cultivating nutriment, molding the mixture to molded bodies and curing the molded bodies. The molded bodies are manufactured such that the molded bodies are water floatable having a closed cavity inside the body, or containing density decreasing material for example. The manufacturing method enables to produce algae cultivating medium that can float on water in a large quantity. Industrial waste such as coal ashes and incineration ashes, sands and crushed shells can be used as the inorganic raw material of the medium. As the curing material which solidify the molded body, other than cement, algae cultivating nutriment such as phosphorus compounds can be used. Extrusion molding can favorably be applied for molding molded body. A cylindrically molded body can be sealed the both edges thereof to form a cavity portion inside thereof. A disintegration molding after preparatory molding, or agitation molding can also be used as molding step of this manufacturing method. Further, waste heat of a thermal power plant or an incinerator that produce inorganic material as wastes can be used for curing the molded body.

Method of producing algae cultivating medium

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Kawasaki, Japan

Yoshinari Takamatsu