Ratification of the IMO’s Ballast Water Management Convention is widely anticipated within the next 12 months. As a consequence, ship owners are evaluating as a matter of some urgency which ballast water treatment technology is best suited to both their existing and new ships.
Recognising 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 AQUARIUSTM.
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 to both the new build and retrofit markets. 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 AQUARIUSTM -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 AQUARIUSTM -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 AQUARIUSTM -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. Hamworthy is collaborating with Magneto Special Anodes for the development of 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 back to the sea.
Dr 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 AQUARIUSTM systems are designed and supplied to treat ballast water across a full range of ballast pump sizes.”
The AQUARIUSTM systems achieve filtration using automatic back-washing screen filter technology. The filter is designed specifically for ballast water applications and filters particulates down to 40μm. Operation of the filter includes automatic back-washing to ensure efficient removal of particles that are 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 AQUARIUSTM -UV and AQUARIUSTM -EC systems were 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 resulting in a full pass against requirements of the IMO D2 standard. Hamworthy is also conducting AQUARIUSTM-EC specific corrosion and paint coating tests according to MEPC requirements.
With all testing complete Hamworthy will secure IMO type approval for the AQUARIUSTM range within 2012.