Patent ID: 8147687

Claim:
A ballast water treatment 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 to at least one of the one or more ballast tanks; a circulation pump and a circulation pipeline forming a circulation system installed inside the at least one of the one or more ballast tanks; and 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; wherein the circulation pump is configured to circulate the ballast water inside the at least one of the one or more ballast tanks within the circulation pipeline so as to bring the ballast water into contact with the element in the ozone decomposer.