DIFFERENCE BETWEEN D-1 AND D-2 STANDARDS

SHIPAXIS TECHNICAL SERVICES

DIFFERENCE BETWEEN D-1 AND D-2 STANDARDS

The difference is that D-1 relates to ballast water exchange, while D-2 specifies the maximum amount of viable organisms allowed to be discharged, including specified indicator microbes harmful to human health.
D-1 standard - The D-1 standard requires ships to conduct an exchange of ballast water such that at least 95% of water by volume is exchanged far away from the coast. 
D-2 standard - The D-2 standard specifies that ships can only discharge ballast water that meets the following criteria:
  • less than 10 viable organisms per cubic metre which are greater than or equal to 50 micrometres in minimum dimension;
  • less than 10 viable organisms per millilitre which are between 10 micrometres and 50 micrometres in minimum dimension;
  • less than 1 colony-forming unit (cfu) per 100 mililitres of Toxicogenic Vibrio cholerae;
  • less than 250 cfu per 100 millilitres of Escherichia coli; and
  • less than 100 cfu per 100 milliliters of Intestinal Enterococci.

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