| 摘要 |
A ballast water treatment system (1) comprising at least one treatment unit (2) which treatment unit (2) comprises a housing (5), surrounding a fluid chamber (6) in which at least one UV-lamp (3) enclosed and protected by a quartz sleeve (9) is arranged, where said fluid chamber (6) has an inlet (7) and an outlet (8) and defines a flow path between said inlet (7) and said outlet (8), for the ballast water, passing said UV-lamp (3), wherein at a distance from each UV-lamp (3) a UV-sensor (10) is arranged in the flow path or on an interior wall of the housing (5) measuring the UV-intensity from said lamp (3) as a result of actual lamp output, fouling of the quartz sleeve (9) and UV-transmittance of the ballast water, and wherein a control unit (11) is arranged to, continuously on the basis of said measured UV-intensity and a desired minimum UV-intensity, calculate a new lamp output value and to adjust the lamp output to said new lamp output value. A method for treating ballast water is described, comprising leading ballast water through a treatment unit (2) comprising a housing (5) surrounding a fluid chamber(6) in which at least one UV-lamp (3) protected by a quartz sleeve (9) is arranged between an inlet (7) for the untreated ballast water and an outlet (8) for the treated ballast water, exposing said ballast water to UV-radiation, measuring the UV-intensity from said UV-lamp (3) at a distance from said UV-lamp (3) as a result of actual UV-lamp output, fouling of said quartz sleeve (9) and UV-transmittance of the ballast water, calculating a new UV-lamp output value and adjusting the UV-lamp output to said UV-lamp output value. |
