What ballast water treatment technologies are currently used to achieve the D-2 Performance Standard?

Filtration; cyclonic separation; UV radiation; cavitation, electrolysis; chemical additives; de-oxygenation; and gas super-saturation. These may be used in ballast water treatment systems either singularly or in combination.

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What are the basic requirements of the BWM Convention relating to approval of ballast water treatment systems?

When does the D-2 Performance Standard come into force?