Doryokuro Kakunenryo Kaihatsu Jigyodan

Hideaki Tamai

Katsuyuki Ohtsuka

Jin Ohuchi

Yoshiharu Takahashi

Katsuyuki Otsuka

Yoshimi Kawato

Noriyuki Hayano

Shizuo Mine

Tatushi Arishige

A process for electrolytically treating a radioactive liquid waste includes electrolyzing a radioactive liquid waste containing sodium compounds using mercury as a cathode in an electrolytic cell, separating the liquid waste into an amalgam of metals, inclusive of sodium, and residue, separating the metals including the sodium from the amalgam, purifying and reutilizing the metals, and recycling the mercury in the electrolytic cell.

Electrolytic treatment of radioactive liquid waste to remove sodium

A method for thermal decomposition treatment of a radioactive waste uses an apparatus comprising a container for holding molten matter of a radioactive waste containing a sodium compound, a pair of electrodes contacting the molten matter, and a power source for applying voltage between the electrodes while changing the polarity thereof every several tens of seconds. In this apparatus, the molten matter can be heated in the container by Joule heat, which is evolved by electric current directly flowed through the molten matter, so that the sodium compound contained in the radioactive waste can be decomposed, vaporized and removed to recover a stabilized radioactive solid as a residue in the container.

Method for thermal decomposition treatment of radioactive waste

A nitrate solution which is a substance to be treated is heated and denitrated using microwaves, by introducing the substance directly into a cylindrical oven to which microwaves are applied, horizontally rotating the oven about a vertical axis, detecting the amount of reflected waves of the applied microwaves with time to observe the heating condition of the substance, and controlling microwave power to be applied according to the detected amount of the reflected waves and the change in the amount of reflected waves with time. The cylindrical oven preferably has a construction capable of being separated into a stationary upper part and a horizontally rotatable lower part constituting a closed-bottom vessel. These two parts are combined through a choke coupling mechanism to form the oven. According to the detected values of the reflected waves, the precise control of the microwave power applied to the substance to be treated can be conducted at a suitable time.

Method and apparatus for denitration of nitrate solution by microwave

Growing community of inventors

Fukuoka, Japan

Hideaki Tamai