Abstract: A method for treating ship ballast water in which aquatic organisms in the ship ballast water are exterminated by adding hydrogen peroxide or a compound producing hydrogen peroxide in an amount such that a hydrogen peroxide concentration comes to be 10 to 500 mg/L to the ship ballast water, and then providing physical means for causing shear strength and/or cavitation to the ship ballast water.
Type:
Grant
Filed:
February 17, 2006
Date of Patent:
February 28, 2012
Assignees:
Katayama Chemical, Inc., The Japan Association of Marine Safety, Marine Technology Institute Co., Ltd., Laboratory of Aquatic Science Consultant Corporation, M.O. Marine Consulting, Ltd., Mitsui Engineering & Shipbuilding Co., Ltd., Shinko Ind. Ltd.
Abstract: 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.
Type:
Application
Filed:
October 19, 2010
Publication date:
June 16, 2011
Applicants:
The Japan Association of Marine Safety, M.O. Marine Consulting, Ltd., Shinko Ind. Ltd., Laboratory of Aquatic Science Consultant Co., Ltd, Mitsui Engineering & Shipbuilding Co., Ltd.
Abstract: 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.
Type:
Grant
Filed:
November 9, 2007
Date of Patent:
November 23, 2010
Assignees:
The Japan Association of Marine Safety, M.O. Marine Consulting, Ltd., Shinko Ind, Ltd., Laboratory of Aquatic Science Consultant Co., Ltd., Mitsui Engineering & Shipbuilding Co., Ltd.