Feature 3 | WASTE TREATMENT RETROFITS RWO targets sewage treatment retrofits
Part of the Veolia group, Germany’s RWO’s Marine Water Technology division is involved in several projects at the moment that require the installation of systems onboard existing vessels.
into force in January 2010 – have been installed by RWO onboard existing vessels. RWO’s biological WWT-LC system is a Mixed Bed Biofilm Reactor (MBBR) solution that is delivered as a ‘plug and play’ unit. Tis is said to give ‘excellent’ results in treating effluent and is highly flexible, as it is suitable to treat both black and grey water or black water only. Beside this biological solution, RWO
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has also been retrofitting membrane-based sewage treatment systems, including its Memrod advanced wastewater treatment system. This can treat all wastewater streams onboard, meeting even the tough regulatory requirements imposed by the Alaska authorities, and has been installed on a number of naval, research and cruise ships. According to director, sales and marketing, Peter Wolf: “The Memrod technology is suitable for both newbuilds and refits, but especially for existing vessels, allowing them to meet new and special discharge regulations in a cost effective and efficient way.” RWO is also introducing new technology
which is expected to be a popular choice for upgrading existing ships. CleanBallast, which recently received its Type Certificate, is a modular system that is claimed to be particularly well suited
number of biological sewage treatment plants – meeting the MEPC.159(55) rules which came
RWO’s CleanBallast system.
for retrofits. Mr Wolf says: “Te modular design eases integration into existing ships and allows available space to be utilised in the best possible way. Furthermore the CleanBallast system offers a high reduction in sediment load, low pressure loss and low power consumption, with no increase in corrosion or material damage.” RWO believes that demand for retrofitting enhanced environmental
protection or waste treatment systems onboard existing vessels will increase significantly over the next few years. As Mr Wolf points out: “The biggest factors will be the upcoming and even stricter discharge limit values for sewage treatment plants and especially the ballast water treatment convention, which will be applicable not only for newbuildings but also for existing ships.” SCRT
Cruise ship success for Scanship
Scanship continues to supply Advanced Wastewater (AWP) systems to existing cruise vessels, having retrofitted more than 20 vessels since 2003
wastewater on three passenger ships while in regular operation. Tese are Voyager of
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he Norwegian company Scanship is in the process of carrying out retrofits installing advanced
the Seas and Azamara Journey for RCCL and the Hurtigruten ship Finnmarken. Earlier this year Scanship also installed
an AWP system on Regent Seven Seas Navigator, for Prestige Cruise Holdings.
Furthermore the company upgraded the cruise ships, Millennium and Constellation, installing biofilm technology on equipment originally supplied by a competitor to meet Alaska regulations. SCRT
Shiprepair and Conversion Technology 4th Quarter 2010
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