the IHS Ballast Water Guide - RWO Marine Water Technology

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IHS Fairplay Solutions Guide to Ballast Water Treatment Systems Sponsored by micro-organisms. In addition, the electrolysis cell’s special coating ensures sufficient chlorine concentration. During deballasting, residual chlorine is neutralised by the addition of sodium bisulphite solution. Great emphasis has been placed on monitoring and control to ensure proper operation and effective neutralisation of treated ballast water prior to discharge to sea. The control unit logs the status of the system, operation, electrolytic cell, selfcleaning filter and cyclonic separator. ar arator or or. or or. BallastMaster GEA Westfalia 2 7 Its maker maintains that the BallastMaster system requires low amounts of energy and has a neutral effect on the environment. BallastMaster operates in three stages. First, during the filtration phase, ballast water is taken on board and passed through a backflush cartridge filter that removes particles larger than 40µm at up to 1,000m 3 /h. In the second stage, disinfection, an active substance is added directly into the pipe leading to the ballast tank. An oxidate created on board using electrolysis is used as a disinfectant. This is produced from a simple sodium chloride solution, consisting of common salt and freshwater, and is added to the ballast water that has been taken on board. The oxidate breaks down into its original ingredients when exposed to ultraviolet radiation, which makes the substance inactive. Any possible after-effect of the processing is counteracted in the third stage, neutralisation. As the ballast water is discharged, a sulphur-based neutralisation agent is added, if required, to reduce the total residual oxidants (TRO) content to below the level of 0.2ppm specified by the IMO. An important point is that the system works with low energy and operating costs. The installation of a plant with a capacity of 500m3 /h is said to require an electrical current of less than 8kW, most of which appears to be required for the electrolysis of the he dis disinfectant. is isinfe fectan an ant. SEDNA Hamann 2 1 The SEDNA system developed in Germany by Hamann was one of the first systems to be given full approval in 2008. Physical separation is in two stages: a hydrocyclone followed by a compact, selfcleaning filter with 50µm meshes. The cleaning of the filter is triggered by the differential pressure. During backflushing the filter elements are cleaned one by one with seawater without addition of any cleaning substances. When backflushing the ballast water operation continues at a slightly reduced flow rate. The system can be adapted to different ballast water pump capacities, ranging in size from 200m 3 /h to 1,000m 3 /h for individual installations. Ballast water pump capacities in excess of 1,000m 3 /h are said to be possible. In addition to physical treatment, the system makes use of Peraclean Ocean (a chemical substance developed by Evonik- Degussa). This substance has created problems for the system because although it performs as expected under most circumstances, at extremely low sea temperatures and in freshwater it does not degrade and so can remain active in the environment. The fully approved ballast water treatment system was withdrawn from the market after concerns were expressed that the active substance it uses could remain toxic after discharge. Under pressure from the German authorities, further tests were carried out 18 © IHS Global Limited 2012 012_037_CorrectedBW1204.indd 18 01/08/2012 15:31:59
Sponsored by IHS Fairplay Solutions Guide to Ballast Water Treatment Systems on the product towards the end of 2009 and the results persuaded Hamann that it should withdraw it. The existing patents of the SEDNA system will be maintained and Hamann has indicated it will further develop the system em in time time. me. Aquarius Hamworthy/Hanovia The Aquarius system from Hamworthy and Hanovia employs filtration followed by disinfection using ultraviolet light 2 3 The Aquarius-UV system follows a twostage process with filtration followed by disinfection using ultraviolet light, and so does not use any active substance. Because there is no detrimental effect on water quality, ballast water can be safely discharged from the ballast tank at any time. In addition, to ensure maximum disinfection, ultraviolet treatment is utilised during the discharge cycle, as well as during 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 uses an active substance, generated using side-stream electro-chlorination. Hamworthy is collaborating with © IHS Global Limited 2012 19 012_037_CorrectedBW1204.indd 19 01/08/2012 15:32:26 Photo: Hanovia
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