ballast water treatment
UV ballast water solutions gain favour
A preference for small UV-based ballast water management solutions may be emerging in the cruise shipping sector
by Clive Woodbridge R atification of IMO’s Ballast Water
Management Convention is widely anticipated within the next 12 months and
it could well be legally enforceable by the end of 2013. The intention is that almost all commercial vessels will have to be fitted with a ballast water management system (BWMS) by 2016. As a consequence, passenger ship owners and operators, along with the rest of the shipping industry, are having to evaluate which ballast water treatment
technology is best suited to meet their requirements. Many manufacturers are now competing to deliver technology suitable for various vessel types, including passenger ships, for both newbuildings and what is expected to prove to be a hugely lucrative market for BWMS retrofits. Not all BWMSs being developed are appropriate for the passenger shipping sector, however, as ferries and cruise ships will typically require ballast water treatment systems with capacities of 100m3 to 800m3 per hour. Several systems on the market are aimed at larger cargo vessels with much higher capacity requirements, up to 6,500m3 per hour, and so will not be well matched to the needs of passenger ship operators. Severn Trent De Nora, for example, gained IMO type approval system, which
last year uses for electrolytic
its Balpure disinfection
Hamworthy recently unveiled its Aquarius-UV ballast water management system
92 I Passenger Ship Technology I Spring 2012
technology. Marketing manager, Joyce Teng, said, “We have decided not to focus on such small ballast-rate capacity ships. The smallest system in the Balpure range is currently 500m3 per hour and for most passenger ships this is a larger capacity than required. However we are studying the marketability of smaller Balpure designs, based on our offshore platform system, which may be attractive for these types of vessels.” For those manufacturers targeting the passenger ship market, the cruise ship sector in particular has specific requirements to meet. For example, the itinerary of a typical cruise ship may include frequent port calls and this creates a need for a BWMS solution that can comply with short post-treatment ballast water residence times in the tanks. The wide range of environmental conditions that a cruise ship may encounter in undertaking different cruise itineraries also requires a high degree of design flexibility, so that the system is able to handle variable water quality over a wide range of water temperatures. Several manufacturers point out that, in their discussions with cruise operators, it is made clear that adopting ballast treatments that make use of chemical
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