Abstract: A method and control unit for controlling a ballast water treatment system are disclosed. In the method, a prevailing operational condition value relating to the filter unit and/or the treatment unit is determined by means of a sensor. Based on the determined prevailing condition value, a modifying action is performed. The method further includes, when repeated during a determined time interval, tracking a trend for the development of the prevailing operational condition values and/or a frequency for the modifying actions. Based on the tracked trend, a moment in time where a critical value for the prevailing operational condition value is predicted. The ballast water treatment system is controlled by performing the modifying action on the basis of the prediction and/or the value for the determined prevailing condition.

Abstract: In a method performed by a control device for verifying the performance of a UV-reactor for treating ballast water in marine vessels, the UV-reactor includes at least one UV-light source; at least one UV-light sensor; an inlet and an outlet for liquid; and the control device. The method includes controlling a cleaning process of the UV-reactor; controlling a flow of fresh water into the UV-reactor for filling the UV-reactor with fresh water; recording a UV-intensity, value from the at least one UV-light source by the at least one UV-light sensor; comparing the recorded UV-intensity value with a setpoint UV-intensity value, the setpoint value being either a default value or is defined at commissioning of the UV-light source; and generating a user alert, if the recorded UV-intensity value is lower than the setpoint value. A control device and a UV-reactor are also disclosed.

Abstract: A ballast water treatment system includes at least one UV-light reactor with at least one UV-lamp, an inlet line for ballast water to be treated connected to the reactor and an outlet line connected to the reactor. The system includes a cleaning system for periodic cleaning of the reactor, including a water inlet line connected to the reactor for supplying water, a container with concentrated CIP-liquid connected to the reactor, a CIP-liquid inlet line connecting the container to the reactor, a dosage pump arranged in the CIP-liquid inlet line for supplying a predetermined amount of concentrated CIP-liquid to the reactor to mix with the water, a circuit comprising the reactor and a pump arranged in the circuit for circulation of water mixed with the concentrated CIP-liquid.

Abstract: A ballast water treatment system includes at least one UV-light reactor with at least one UV-lamp, an inlet line for ballast water to be treated connected to the reactor and an outlet line connected to the reactor. The system includes a cleaning system for periodic cleaning of the reactor, including a water inlet line connected to the reactor for supplying water, a container with concentrated CIP-liquid connected to the reactor, a CIP-liquid inlet line connecting the container to the reactor, a dosage pump arranged in the CIP-liquid inlet line for supplying a predetermined amount of concentrated CIP-liquid to the reactor to mix with the water, a circuit comprising the reactor and a pump arranged in the circuit for circulation of water mixed with the concentrated CIP-liquid.

Abstract: A device and method for treating ballast water, including an enclosure having LJV radiating elements, and catalysts include a number of plates having turbulence and mixing generating elements characterised in that the catalyst plates are arranged in the enclosure, and that the catalysts having turbulence and mixing generating elements selected from one or more of the elements from the group consisting of perforations, holes, punchings, structured pressings, corrugations, and grooves. A system for treating ballast water in a ship is also disclosed.