Kurita Water Industries Ltd.

Kazuhiko Tsunoda

Kouichi Tanaka

Minoru Yagi

Yutaka Yoneda

Kaname Harada

Kotaro Fukuzawa

Naohiro Nagai

Hideo Otaka

Akira Iimura

An object of the present invention is to reduce the installation load, or the maintenance or the management load of a measurement device for ballast water that is measured for plural times, and to simplify the linkage between ballast water process equipment and a ballast water measurement device that are installed in a ship. A measurement device () includes, a first measuring part (--) that measures water quality of a first ballast water, with referring to ballast water before processing as the first ballast water and ballast water after the processing as a second ballast water, a second measuring part (--) that measures water quality of the second ballast water, a reagent supply part () that is connected to the first measuring part and the second measuring part, and that supplies a reagent from one reagent container to the first measuring part and the second measuring part, a water discharge part () that is connected to the first measuring part and the second measuring part, and that discharges the first ballast water and the second ballast water each after the measurement, and a housing () that accommodates therein the first measuring part, the second measuring part, the reagent supply part, and the water discharge part.

Ballast water measurement device and ballast water measurement method

The invention provides a bactericidal/algicidal method including adding an oxidant-based bactericidal/algicidal agent and a stabilizer therefor to a target water system, characterized in that the amount of combined chlorine or the stabilizer in the water system is controlled by generating free residual chlorine in the water system, and a bactericidal/algicidal method including adding an oxidant-based bactericidal/algicidal agent and a stabilizer therefor to a target water system, characterized in that the amount of the oxidant-based bactericidal/algicidal agent added is controlled so that the concentration of total residual chlorine in the water system falls within a predetermined range, and the amount of combined chlorine or the stabilizer is controlled so that the concentration of free residual chlorine in the water system falls within a predetermined range. An object of the present invention is to provide a bactericidal/algicidal method including adding an oxidant-based bactericidal/algicidal agent and a stabilizer therefor to a target water system for bactericidal/algicidal treatment, wherein the amount of combined chlorine or the stabilizer is controlled, and the amount of the oxidant-based bactericidal/algicidal agent added is controlled, which method realizes effective utilization of the stabilizer, to thereby reduce the amount of the stabilizer employed and to reduce COD and the amount of nitrogen derived from the stabilizer, and which method does not require a special control apparatus for in-line mixing as described above.

Bactericidal/algicidal method

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Tokyo, Japan

Kazuhiko Tsunoda