agents is not desirable. As a result there seems to be a clear preference amongst cruise shipping companies to adopt ultraviolet (UV)-based solutions. As a practical example, Sumitomo Electric Industries has recently agreed with NYK Cruises to install the UV-based Ecomarine BWMS on its cruise ship, Asuka II. The work was due to be completed by the end of January 2012. Ecomarine incorporates filter units originally developed by Sumitomo Electric to separate large plankton and other aquatic organisms. The ballast water management system then eliminates any remaining small organisms with a medium- pressure UV system. When tested on land using an arrangement comparable to onboard conditions – with a water treatment rate of 200m3 per hour – Ecomarine is reported to have demonstrated reduced power consumption and a organism removal capacity in line with requirements. Sumitomo has now applied for IMO approval for its system and says it aims to secure full type approval for Ecomarine by the end of 2012. Elsewhere, UK-based Hamworthy has recently
introduced its Aquarius range, which includes both UV and chemical treatment options. The passenger ship market is expected to be an important target for the UV product especially. Dr Joe Thomas, managing director, Hamworthy Ballast Water Systems, commented, “We are currently the only original equipment manufacturer offering a choice of ballast water treatment solutions to both the newbuild and retrofit markets.” The Aquarius-UV system is a two-stage approach filtration
with followed by disinfection using
ultraviolet light, and so does not use any active substance. As there is no detrimental effect on water quality, ballast water can be safely discharged from the ballast tank at any time. Furthermore, to ensure maximum disinfection, UV treatment is utilised during the discharge cycle, as well as on ballasting. In developing the Aquarius-UV system, Hamworthy has formed a strategic partnership with UK-based Hanovia, a specialist in UV system design and manufacturing. Hamworthy has, however, assumed overall responsibility for performance compliance against the required regulatory standards. Hamworthy is also marketing the Aquarius-
EC system, which similarly employs a two-stage approach, but in this case disinfection uses an active
www.passengership.info
Severn Trent De Nora is looking to develop smaller versions of its Balpure system
substance, generated using side stream electro- chlorination. Hamworthy is
collaborating with
Magneto Special Anodes to develop the advanced electrolysis technology. Upon de-ballasting, the system neutralises any remaining active substance using sodium bisulfite, ensuring that the ballast water can be safely discharged. The Aquarius-UV system is
currently being
prototype tested on a 2,000 dwt LPG carrier, while the EC version is being tested on a 13,000 dwt roro ship. Although Hamworthy has not been engaged in any passenger ship BWMS installations to date, the company says it is actively engaged with a number of key cruise ship owners and operators. Dr Thomas added, “BWMS for passenger ships must be modular to allow for retrofitting on the existing fleet. We believe the fact that we have adopted a modular approach to system design in both versions of Aquarius will prove a key selling point in this sector of the industry.”
Norway-based Optimarin is another company that has embraced UV-based ballast water technology with its Optimarin Ballast System (OBS). Birgir Nilsen, vice president, business development, said, “We think that the OBS is well-suited for the passenger industry because the system is simple, flexible, and has a small onboard footprint. Furthermore the low maintenance requirement for this technology will be a key factor.” He also pointed
Passenger Ship Technology I Spring 2012 I 93
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