Patent ID: 7618545

Claim:
A method for treating ship ballast water, said method comprising adding to the ship ballast water: (1) hydrogen peroxide or a compound producing hydrogen peroxide in an amount such that a hydrogen peroxide concentration in the ship ballast water is 10 to 500 mg/L, and (2) at least one chemical selected from the group consisting of: (a) ferrous ion or a compound supplying ferrous ion in an amount such that a ferrous ion concentration in the ship ballast water is 0.1 to 400 mg/L, (b) catalase in an amount such that a concentration of catalase in the ship ballast water is 0.5 to 2,500 unit/L, and (c) iodine or a compound supplying iodine in an amount such that an iodine concentration in the ship ballast water is 0.1 to 100 mg/L, such that organisms viable in the ship ballast water are exterminated and the concentration of dissolved oxygen in the ship ballast water is maintained at a level viable to said organisms.