Patent ID: 7833411

Claim:
A ballast water treatment system for treating water to be delivered into ballast tanks, said system comprising: one or more ballast tanks installed in a ship; a reaction tank installed outside the one or more ballast tanks wherein raw water and ozone are imported and made to react with each other for a predetermined period of time to kill microorganisms existing in the raw water; a transfer pump installed outside the one or more ballast tanks and configured to draw and transfer water containing residual ozone from the reaction tank; a circulation pipeline installed outside the one or more ballast tanks, the circulation pipeline disposed in fluid communication with the discharge side of the transfer pump and forming a closed circulation pipeline configured to return the water transferred by the transfer pump back to the discharge side of the transfer pump; wherein the transfer pump is outside the circulation pipeline; an ozone decomposer disposed along the circulation pipeline, and comprising an element for decomposing and removing ozone contained in the water passing through the decomposer; a circulation pump disposed along the circulation pipeline and configured to provide sufficient pump head to circulate the water transferred by the transfer pump within the circulation pipeline so as to bring the transferred water into contact with the element in the ozone decomposer several times; and one or more inlet pipes for connecting the circulation pipeline to each of the one or more ballast tanks, each of the one or more inlet pipes having an on-off valve.