| 摘要 |
#CMT# #/CMT# Treating ballast water, comprises adding equilibrium peracetic acid and catalase to the ballast water on uptake of ballast water into a ship, where equilibrium peracetic acid is added in an amount of 5-50 mg/l peracetic acid and catalase is added in an amount which decomposes the content of the hydrogen peroxide introduced with the equilibrium peracetic acid to less than 2 mg/l in the ballast water within 120 hours. #CMT# : #/CMT# An independent claim is also included for a device for treating the ballast water comprising a ballast water tank (1), a conduit (2) for filling the ballast water tank and a line (8) for emptying the ballast water tank, where metering devices for equilibrium peracetic acid and catalase 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. #CMT#USE : #/CMT# The method is useful for treating ballast water. #CMT#ADVANTAGE : #/CMT# The method: eliminates the microorganisms in ballast water; discharges the treated ballast water in simple manner; utilizes less chemicals; and provides treated ballast water with less amount of peracetic acid and hydrogen peroxide, which has no adverse effects on the water. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a schematic representation of the device. 1 : Ballast water tank 2 : Conduit 8 : Line 12 : Flow measuring device 17 : Metering device #CMT#ENVIRONMENT : #/CMT# Preferred Components: The ballast water exhibits a temperature of 0-180[deg] C, and a salinity of 0-16 on uptake into the ship. The catalase is added in an amount of 0.1-40 units/l. The content of peracetic acid is reduced by adding a reducing agent to less than 1 mg/l prior to discharge of the treated ballast water. The sodium sulfite or sodium hydrogen sulfite is added as a reducing agent. The content of peracetic acid in the treated ballast water is determined using an amperometric sensor, and the addition of the reducing agent is controlled using the determined content of peracetic acid. #CMT#INSTRUMENTATION AND TESTING : #/CMT# Preferred Components: The conduit for filling the ballast water tank is provided with: a flow measuring device (12), with which the metering devices are controlled for equilibrium peracetic acid and catalase; and a temperature measuring device and/or a measuring device for the salinity, with which the metering device for catalase is controlled. The line for emptying the ballast water tank is provided with: a flow measuring device and a sensor with which the metering device is actuated for a reducing agent; measuring device for the salinity; a sensor for the content of hydrogen peroxide, with which the metering device is actuated for reducing agent. The sensor for the content of peracetic acid is an amperometric sensor. A separation device for particles having a size of 2-100 mm, is arranged in front of the metering devices in the line for filling the ballast water tank. #CMT#EXAMPLE : #/CMT# No suitable example given. |
