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Feature 1 | BALLAST WATER SYSTEMS Aquarius offers an alternative


Hamworthy is introducing both ultraviolet and chemical based treatment options within its new ballast water management system.


R


ecognising that no one solution will be suitable across all ship types, sizes and environmental


conditions, Hamworthy’s dedicated ballast water research and development team has developed two different treatment


solutions to provide


customers with greater flexibility and choice. The product range is referred to as Aquarius, and is suitable for both the retrofit and newbuild markets. Dr Joe Thomas, managing director,


Hamworthy Ballast Water Systems points out: “We are currently the only OEM offering a choice of ballast water treatment solutions. We believe this gives our customers every confidence that by working with Hamworthy they will be able to find the technology best suited to their particular needs.” The Aquarius-UV system is a two


stage approach with filtration 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 assumed overall responsibility for performance compliance against the required regulatory standards, with the UV system being an essential component to integrate with Hamworthy’s ballast water management solution. Hamworthy is also marketing its


Aquarius-EC Ballast Water System, which similarly employs a two stage approach, but in this case disinfection using an active substance, generated using side stream electro-chlorination. Upon


de-bal lasting, the system


neutralises any remaining active 22


Hamworthy’s new ultra-violet Aquarius-UV system is undergoing sea trials on a LPG carrier.


substance using sodium bisulfite, ensuring that the ballast water can be safely discharged back to the sea. Hamworthy is collaborating with Magneto


Special Anodes for


down to 40μm. Operation of the filter includes automatic back-washing to ensure efficient removal of particles that


are the


development of the required advanced electrolysis technology. Thomas says: “Both systems provide


a robust solution for the treatment of ballast water across a range of challenging ship operating end environmental conditions, exceeding the required IMO standards. We have also adopted a modular approach to system design in both cases so that equipment can be flexibly arranged to suit conditions onboard. Furthermore, both the Aquarius systems are designed and supplied to treat ballast water across a full range of ballast pump sizes.” The Aquarius systems achieve


filtration using automatic back-washing screen filter technology. The filter is designed specifically for ballast water applications and filters particulates


discharged back to the


environment of origin, the systems are PLC-controlled with user friendly touch screen operation. All relevant data is stored by the PLC in accordance with IMO requirements and the system can be fully integrated into the main control system to achieve complete ballast water management onboard the ship. Land-based testing of both the


Aquarius-UV and Aquarius -EC systems was successfully completed in early 2011 at NIOZ (The Royal Netherlands Institute for Sea Research) and sea trials involving both the systems are currently underway with the first official sea trial sampling reportedly resulting in a ‘full pass’ against the requirements of the IMO D2 standard. Hamworthy is also conducting Aquarius-EC specific corrosion and paint


coating tests according to MEPC requirements. Shiprepair and Conversion Technology 1st Quarter 2012


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