Kurita Water Industries Ltd.

Hitachi-ge Nuclear Energy, Ltd.

Mamoru Iwasaki

Kazushige Ishida

Motohiro Aizawa

Nozomu Ikuno

Nobuyuki Ota

Mitsuharu Terashima

Hideaki Iino

Takako Sumiya

Shingo Miyamoto

Hideyuki Komori

Mami Hirose

Provided is a method for controlling a pH to a neutral range (pH 6 to 8) by adding an alkali or an acid to decarbonated water, including controlling the amount of the alkali or the acid added using an electrical conductivity meter. The decarbonated water is, for example, water obtained by decarbonating industrial water or groundwater so that the concentration of carbonic acid is 10 ppm or less. The method may further have a step of producing pure water by RO treatment of the decarbonated water with a pH adjusted to 6 to 8 by the pH control.

Method for controlling pH by electrical conductivity

In an electrodeposition treatment of an iron-group metal ion-containing liquid, without being influenced by the properties of the iron-group metal ion-containing liquid, iron-group metal ions are efficiently removed from the liquid by precipitation. An anode chamberA provided with an anodeand a cathode chamberA provided with a cathodeare separated from each other by a cation exchange membrane, an iron-group metal ion-containing liquid is charged into the anode chamberA, a cathode liquid is charged into the cathode chamberA, and by applying the voltage between the anodeand the cathode, iron-group metal ions in the liquid in the anode chamberA are moved into the liquid in the cathode chamberA through the cation exchange membrane, so that an iron-group metal is precipitated on the cathode

Treatment method and treatment apparatus of iron-group metal ion-containing liquid, method and apparatus for electrodepositing Co and Fe, and decontamination method and decontamination apparatus of radioactive waste ion exchange resin

Provided is a desalting device which includes a tower body and a bulge portion bulging downward therefrom, and which prevents uneven flow and causes no dead space within the tower body. The desalting device includes a tower body having a bulge portionbulging downward at a bottom portion thereof, an ion-exchange resin packed in the tower body, and a plurality of strainersfor collecting water being arranged within the bulge portion. The strainers are arranged only in a central region of an inside of the bulge portion excluding an outer peripheral portion of the bulge portion.

Desalting device

Growing community of inventors

Tokyo, Japan

Mamoru Iwasaki