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Why the ballast water treatment systems are required
While Merchant ships carrying more than 80% of the world’s commodities are operated with approximately 3 to 5 billion tons of ballast water each year to ensure stability, trim and structural integrity. At least 7,000 different species are being carried in ships’ ballast tanks .
IMO requires the Ballast Water Treatment Systems to prevent introduction of invasive marine species into new environments by ships’ ballast water as identified as one of the four greatest threats to the world’s oceans, causing severe human health, economic and/or ecological impacts in their host environments by catastrophic introduction monitored around the world. |
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Ballast water management for ships (IMO Reg. B-3) |
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Keel laying |
BW Volume, m3 |
‘08 ‘09 ‘10 ‘11 ’12 ‘13 ‘14 ‘15 ‘16 ‘17 ‘18 |
Existing Ships
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<2009
<2009
<2009 |
<1,500
1,500~5,000
>5,000 |
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New
Ships
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≥2009
2009~2011
≥2012 |
<5,000
≥5,000
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| (D-1 : Ballast Water Exchange, D-2 : Ballast Water Treatment) |
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| Ballast water performance standard (IMO Reg. B-3) |
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Organism Size Class (In Minimum Dimension)
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Number of Viable Organisms |
| Greater than or equal to 50 microns |
Less than 10 viable organisms per cubic meter |
Less than 50 microns and greater than or equal to 10 microns
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Less than 10 viable organisms per milliliter |
Indicator microbes
1.Toxicogenic Vibrio Cholerae
2.Escherichia coli
3.Intestinal Enterococci |
Less than 1 cfu per 100 milliliters or less than 1 cfu per 1 gram (wet weight) zooplankton samples
Less than 250 cfu per 100 milliliters
Less than 100 cfu per 100 milliliters |
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