Mitsui Engineering and Shipbuilding Company Limited

The Japan Association of Marine Safety

M.o. Marine Consulting, Ltd.

Shinko Ind. Ltd.

Laboratory of Aquatic Science Consultant Co., Ltd.

Kazunobu Hirao

Katsumi Yoshida

Takeaki Kikuchi

Yasuwo Fukuyo

Jun Waki

Seiji Kino

Masahiro Saito

Izumi Ohnishi

Syuji Ueki

A practical treatment apparatus for ship ballast water, which can kill aquatic organisms contained in the ballast water, is provided by being easily incorporated in an existing ballast-water system piping in a ship. In a branch pipebranched from the existing ballast-water system piping for taking in the ballast water into the ship by a first ballast pumpwith high flow-rate/low pressure and transferring it to a ballast tank, an ozone mixing device for mixing ozone generated by an ozone generator, a second ballast pumpfor discharging said ballast water with lower flow-rate/high pressure than those of said first ballast pump, a slit plateprovided on the secondary side of said second ballast pumpand having a plurality of slit-shaped openings for passing said ballast water, and a deaeration tankfor deaerating undissolved ozone from the ballast water are provided, and the apparatus is configured so that the ballast water after deaeration discharged from said deaeration tankis returned to said ballast-water system piping.

Treatment apparatus for ship ballast water

A water treatment system to be installed in a tanker or other cargo ship for destruction of aquatic organisms and microorganisms that may be contained in the water, usually seawater, being pumped into the ship's ballast tank or tanks. Included is a ballast pump having an intake conduit for drawing water from the sea, and a delivery conduit for delivering the water under pressure to the ballast tank. The delivery conduit has mounted therein a slitted or otherwise open-worked screen for mechanically killing the aquatic lifeforms contained in the water by shearing action. For chemical treatment, on the other hand, part of the water being delivered by the ballast pump is bypassed into an ozone impregnator thereby to be impregnated with ozone from an ozonizer. A bypass pump repressurizes the ozone-impregnated water for returning the same into the delivery conduit.

Treatment system for ships' ballast water

Growing community of inventors

Hiroshima, Japan

Kazunobu Hirao