Treatment Technologies: Research and Development
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The OceanSaver System is an approach to onboard ballast water treatment that has been under development since 2002 by the Norwegian firm MetaFil AS. Designed to meet or exceed the requirements set forth by the International Maritime Organization's (IMO) Ballast Water Performance Standard, the OceanSaver System comprises three components in treating ballast water as it is taken on board and discharged, including pre-filtration, super-saturation with nitrogen gas to cause oxygen deprivation, and a hydrodynamic cavitation unit. The first two components of the OceanSaver System have been installed and operating onboard the MV I since September 2005. Development of the hydrodynamic cavitation unit, the third and key component, is expected to be completed by mid-2006, at which time the OceanSaver System will be fully integrated.
Alfa Laval has recently partnered with the Swedish company Benrad to develop Advanced Oxidation Technology (AOT) for the treatment of ballast water and removal of microorganisms and bacteria. The system is undergoing full-scale trials aboard a Wallenius Marine transoceanic car carrier as is to be commercially available in 2006.
Alfa Laval's system consists of two distinct stages. The first is a pretreatment stage, and the second is a patented AOT solution that is the heart of their system.
Although ultraviolet (UV) light is one of the components of the Benrad AOT system, it differs from traditional UV technology. Benrad AOT uses a lower amount of a special UV light wavelength in combination with catalysts to generate hydroxyl radicals which effectively destroy the microorganism by breaking down the cell membrane.
The whole solution is automatic and fully integrated with the vessel's ballast water system.
Severn Trent De Nora has developed the BalPure™ ballast water treatment system. An electrolyzer generates oxidants that are injected into the ballast stream where they react with both inorganic and organic matter, as well as bacteria, to provide effective disinfection. The system meters and analyzes the residual level of both biocides and neutralizing agents, and logs the performance of the overall ballast water treatment system.
As the harmful organisms are inactivated or destroyed, the oxidant concentration in the ballast water is reduced. The BalPure™ system then introduces a neutralizing agent to the ballast water, where it reacts with residual oxidant, rendering the water safe to discharge into waterways. Laboratories conducting EPA-certified Whole Effluent Toxicity bioassays have confirmed that the low concentration of neutralizing agent used in the BalPure™ process is not harmful to fish, bacteria or the ecosystem as a whole.
Ecochlor™ Ballast Water Treatment System
Ecochlor™ has designed ballast water treatment systems that can be scaled to any size ship and is fully automatic and self-contained. Commercial scale 2500 MT/hr Ecochlor™ CLO2 Ballast Water Treatment Systems have been installed on two ships: M/V Atlantic Compass owned by Atlantic Container Line, and M/V Moku Pahu managed by Matson Navigation on behalf of the Hawaiian Sugar and Transportation Cooperative.
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