Design of a Ballast Water Treatment Vessel
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- Institutt for marin teknikk 
Large amounts of ballast water is transported through shipping globally every year. As the goods moving by sea still continues to increase, the amount of transported ballast water is expected to increase in the future. Ballast water may contain a varied range of marine species including bacteria and viruses. This is considered a potential hazard to the ecological environment as well as human health and economy. In order to prevent future increase in the spread, ships have to comply with the D-2 standard adapted by the International Maritime Organization. Many ships have challenges regarding installation of a separate ballast water treatment system. The challenges are mainly related to space- and power requirements, but the question of whether it is economically advantageous to install such a system on an older ship also have to be asked. The objective of the thesis is to propose a vessel design with main function of receive, treat and discharge ballast water from other ships. There are especially three sub-functions of the vessel which have been emphasized; mooring, transfer-method/coupling, and treatment system. System based ship design is used for developing the ballast water treatment vessel. The NK-03 400 ballast water treatment system have been selected as treatment system, Intelligent Dock Locking for mooring, and a transfer function based on a crane solution with electromagnetic coupling. The resistance of the vessel is calculated by using ShipX, and DelftShip has been used for stability calculations, which proved to be sufficient. The vessel has a hybrid engine setup which satisfies required power consumption for both propulsion and operation of the equipment. Based on a economy consideration the vessel is found to be economically beneficial for ships if they have less than 99 treatments per year. The result is heavily based on assumptions. The basis for this calculation is limited to ships with pump capacity "equal or larger than" 4000 m3/h. There are unproven technical issues regarding the concept, which have to be evaluated further before realizing it. These issues mainly concern service items like coupling sealing solutions not having direct effect on the vessel design process itself.