Jfe Engineering Corporation

Fuji Filter Manufacturing Co., Ltd.

Masanori Nagafuji

Yuichi Takahashi

Takeshi Tsuji

Minoru Yamamoto

Yusuke Shimono

Hiroyuki Takahashi

Shigeki Fujiwara

Yukihiko Okamoto

Itaru Sakai

Kazutoshi Ohashi

A ballast water treatment device includes an oxidant supply amount control device in which a storage unit stores a relationship between an absorbance of a raw water for a ballast and a dissolved organic carbon concentration thereof and another relationship between the dissolved concentration and a residual oxidant concentration required after a predetermined time from an oxidant supply, to kill organisms and to suppress their regrowth in the ballast. A calculation unit derives the required residual oxidant concentration corresponding to the absorbance measured by a meter by referring to the relationships and calculates a target oxidant supply amount using the required residual oxidant concentration. For the target, a control unit controls an oxidant supply device.

Ballast water treatment device and ballast water treatment method

A filtration device including: a casing; a first partition wall which partitions the inside of the casing into a first raw fluid chamber and a filtered-fluid chamber; cylindrical filter elements provided inside the filtered-fluid chamber and of which the inside communicates with the first raw fluid chamber to let fluid pass through from inside toward outside to filter the fluid; a second partition wall provided on the other end of the filter elements to form a second raw fluid chamber; a wash pipe connected to an end of the filter element to let fluid flow from the raw fluid chamber in the axial direction to wash the filter elements; and a wash fluid drain pipe which discharges trapped substances, wherein the other end of the filter element connected to the wash pipe is always open to the raw fluid chamber.

Filtration device and filter element

A filtration device including: a casinghaving a fluid inlet, a fluid outlet, a raw fluid chamber, and a filtered-fluid chamber; a box-shaped or tube-shaped filter element() having a filter mediumremovably installed inside the casing, allowing the fluid to pass through from inside to outside to filter the fluid, and having a backwashing mechanism inside thereof; and a backwash fluid discharge pipewhich discharges backwash fluid to the outside, wherein the backwashing mechanism has a fixed pipefixed to the inside of the filter element, a movable pipemovably fitted to the outside of the fixed pipe, and a backwash headattached to the movable pipe to backwash the filter medium, wherein the fixed pipe and the movable pipe movably guide the backwash head and form a discharge passage for backwash fluid.

Filtration device

Growing community of inventors

Tokyo, Japan

Masanori Nagafuji