The Study On UV Disinfection System Of Ships' Ballast Water

Poor ballast water management has brought about a huge losses to every coastal country. The GEF has confirmed that ballast water to be one of four great threats to the oceans. Experts of all nations and the IMO are focusing on exploiting new effective methods of BWM. On Feb 2004, IMO passed the International Convention for the Control and Management of Ships Ballast Water & Sediments. This contains determined appropriate standards of ballast water treatment. This paper proposes and studies UV radiation method to treat ballast water.UV radiation has considerable advantages over other methods. Because of these advantages and the importance of this issue to many societies, their scientific researchers have paid great attention to this method. This paper utilizes both theory with practice to examine this issue. The study includes the following aspects of this issues.1. It introduces the threats and hazard brought by ships' ballast water. It compares various methods used now, points the advantages of UV radiation.2. It probes principal factors that influence the UV radiation method and puts a strong emphasis on the UV dosage level.3. It provides a design for a UV reactor, and analyzes the hydrodynamic condition of the reactor, points out the flaws, and means of coping with them.4. From the point of UV dosage, analyzes the kill rate of the designed UV reactor, utilizing the Visual Basic 6.0 and develops the Interface of the UV dosage calculation program. It shows from a theoretical analysis that the kill rate is high.5. On the basis of sufficient theoretical analysis, it designs a treatment scheme, builds the experiment table, and debugs the table.