| abstract |
For treating ballast water, on uptake of ballast water into a ship, equilibrium peracetic acid and catalase are added to the ballast water, wherein equilibrium peracetic acid is added in an amount from 5 to 50 mg/l peracetic acid and catalase is added in an amount which, in the ballast water, in the course of 120 h, decomposes the content of the hydrogen peroxide introduced with the equilibrium peracetic acid to less than 2 mg/l. A suitable device for treating the ballast water comprises a ballast water tank (1), a conduit (2, 3, 4, 5, 6, 7, 8) for filling the ballast water tank and a conduit (8, 9, 3, 4, 10) for emptying the ballast water tank, wherein metering devices for equilibrium peracetic acid (15) and catalase (16) are connected to the conduit for filling the ballast water tank, and a metering device (17) for a reducing agent is connected to the conduit for emptying the ballast water tank. |