A pollutant reduction device and method are provided. The pollutant reduction device comprises: an exhaust gas pipe for discharging exhaust gas of a combustion engine; a cleaning water supply pipe for supplying cleaning water; a scrubber for spraying the cleaning water, which is supplied through the cleaning water supply pipe, at the exhaust gas flowing in through the exhaust gas pipe; and a cleaning water discharge pipe for discharging the cleaning water inside the scrubber and supplying the same to a ballast water tank.

A combination marine exhaust gas scrubber and ballast disinfection system using seawater/water surrounding a ship to reduce/scrub smoke-stack emissions and produce a disinfected seawater/water for ballast, which can then be periodically or continually discharged back into the seawater/water body without concern for the spread of non-invasive species.

The invention relates to a method and system for treating water within a water system to control one or more of scaling, corrosion, bacteria and algae. In particular, the invention relates to methods and systems for applying a superimposed time-varying frequency electromagnetic wave comprising both AC and DC components in a pulsating manner to water within a water system, such as, for example, cooling water systems, cooling towers, boiler systems and water storage systems. The method and the system of the invention significantly reduce capital costs and require very low energy, they avoid environmentally unfriendly final products, and are able to result in various treatment effects simultaneously.

An object of the present invention is to increase the accuracy of water quality measurement of ballast waters with different oxidant concentrations. A ballast water measurement apparatus (2 or 62) is provided with: a first measuring unit (6-1 or 64-1) for measuring an oxidant concentration of ballast water after addition of an oxidant or ballast water before addition of a neutralizing agent; a second measuring unit (6-2 or 64-2) for measuring an oxidant concentration of ballast water after neutralization of the oxidant; and a casing (4) that accommodates the first measuring unit and the second measuring unit. Oxidant concentration measurement ranges of the first measuring unit and the second measuring unit are different.

Apparatus is provided having a signal processor or signal processing module configured to receive signaling containing information about the quality of water in a ballast water tank recirculation treatment system, e.g., in a vessel, boat or ship; and determine information about a variable fluorescence treatment to the water in the ballast water tank recirculation treatment system, based at least partly on the signaling received, as well as provide corresponding signaling containing information about the variable fluorescence treatment. The apparatus may include a variable fluorescence device configured to receive the corresponding signaling and provide the variable fluorescence treatment, including providing ultraviolet (UV) light to the water in the ballast water tank recirculation treatment system.

A ballast water treatment device includes a ballast water treatment line, a pump for drawing and pressure feeding treatment target water, a filter, a ballast tank for storing filtered water, and an outboard discharger, and the pump, the filter, the ballast tank, and the outboard discharger are provided on the ballast water treatment line. Treatment target water drawn for a predetermined period from start of drawing treatment target water is not caused to pass through the filter but is discharged outboard by the outboard discharger, and discharging outboard by the outboard discharger is stopped at elapse of the predetermined period and treated water having been filtrated by the filter is poured into the ballast tank.

Provided is a multi-tube nozzle for use in eradicating harmful aquatic organisms, which physically kills harmful aquatic organisms while feeding water and thus allows intake water to be fed directly into a culture tank or a ballast tank without the need for a pretreatment tank, chemicals, neutralizers, etc. A multi-tube nozzle (A) for use in eradicating harmful aquatic organisms includes at least three nozzle tubes (1) that are provided adjacent to each other. The nozzle tubes (1) each includes: an inlet-side opening section (2) having an inner diameter that decreases from an inlet opening toward a throat section (3) located in the middle of the tube; an outlet-side opening section (4) having an inner diameter that increases from the throat section (3) toward an outlet opening; and the throat section (3) having a smallest inner diameter. The adjacent nozzle tubes (1) are spaced apart by a distance such that the adjacent inlet-side opening sections (2) overlap each other. A wall (5) of an overlapping portion (6) of the inlet-side opening sections (2) is cut in a U shape. An uncut portion (5a) between the adjacent U-shaped cut portions (5b) forms a sword-like pointed tip.

Techniques and systems for neutralizing discharge waters from ballast and/or cooling water biocidal treatment and disinfection systems are provided. The systems utilize oxidation reduction potential control to regulate the dechlorination of a biocidal agent to allowable discharge levels in ship buoyancy systems and ship cooling water systems.

Ultrasonic standing waves are generated to trap and separate oil droplets, cellular material and/or gases from a fluid. The methods and apparatuses operate at ultrasonic resonance and are low power, e.g., in the range of 1-5 W. One or more acoustic transducers operating in the 100 kHz to 5 MHz range may be used. The methods and apparatuses may be implemented using relatively large flow chamber and flow rates, e.g., in a range of from about 200 mL/min to greater than about 15 L/min.

The disclosure relates to a method and system for treating ballast water and ballast water treatment systems in order for treatment effects to be carried out, such as controlling the transportation of undesirable and invasive marine organisms. In particular, the disclosure relates to methods and systems for applying a superimposed time-varying frequency electromagnetic wave comprising both AC and DC components in a pulsating manner to ballast water within a ballast water treatment system.