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SAFETY4SEA

BWM Convention: D-2 standard enters into force

by The Editorial Team
October 15, 2019
in Ballast
ballast

Credit: Shutterstock / Image by: Igor Grochev

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Amendments to an international treaty aiming to prevent the spread of potentially invasive species in ships’ ballast water entered into force on 13 October 2019. The amendments set out an implementation schedule to make sure that ships manage their ballast water to meet a specified standard (D-2 standard). They also make mandatory the Code for Approval of Ballast Water Management Systems, which establishes how ballast water management systems used to achieve the D-2 standard have to be assessed and approved.

Ships regularly take on sea water, in tanks, to ensure their stability. Known as ballast water, this can contain many aquatic species, including in microscopic or larval form, which can become invasive and harmful. To address this problem, IMO adopted the International Convention for the Control and Management of Ships’ Ballast Water and Sediments, 2004 (the BWM Convention).

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The BWM Convention entered into force in 2017. The new amendments establish an implementation schedule to ensure ships manage their ballast water to meet a specified standard (D-2 standard), in order to ensure that viable organisms are not released into new sea areas.

They also make mandatory the Code for Approval of Ballast Water Management Systems, which sets out how ballast water management systems used to achieve the D-2 standard have to be assessed and approved.

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More specifically, BWM Convention Regulations E-1 and E-5 have been amended to clarify that:

  • Additional surveys are not to be endorsed on the IBWM Certificate;
  • Regulations governing  the early adoption of Annual Surveys are also applicable for early completion of Intermediate Surveys.

“This will help ensure that aquatic organisms and pathogens are removed or rendered harmless before the ballast water is released into a new location – and avoid the spread of invasive species as well as potentially harmful pathogens.”

IMO specifies.

The amendments to the BWM Convention were adopted in April 2018. Essentially, the schedule for implementation means that compliance with the D-2 standard set out in the Convention will be phased-in over time for individual ships, up to 8 September 2024. Over time, more and more ships will be compliant with the D-2 standard.

In several cases, complying with the D-2 standard can be achieved through equipping ballast water management systems. There are many such approved systems on the market, varying from those which use physical methods, like ultraviolet light to treat the ballast water, to those using active substances. Those that use active substances have to go through a comprehensive additional approval process.

Further amendments to the BWM Convention entering into force on 13 October 2019 relate to survey and certification.

 

 

The BWM Convention – D-2 standard

The D-2 standard specifies that vessels 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 millilitres of Toxicogenic Vibrio cholerae;
  • Less than 250 cfu per 100 millilitres of Escherichia coli;
  • Less than 100 cfu per 100 millilitres of Intestinal Enterococci.

Since the Convention entered into force in September 2017, ships have been required to have a ship-specific ballast water management plan and keep a ballast water record book. They also must manage their ballast water to comply either with the D-1 ballast water exchange standard or the D-2 performance standard.

The amendments that applied on 13 October 2019 formalise the implementation schedule for the transition from the D-1 to the D‑2 standard.

Concluding, IMO published 2019’s edition of Consistent Implementation of MARPOL ANNEX VI, which brings together all the instruments and guidance prepared into one document, including IMO resolutions and circulars.

Tags: BWM ConventionBWMSBWTSIMOInfographicinvasive speciesregulatory updatesm

Comments 2

  1. Capt Ricardo Dupal-ag says:
    1 year ago

    Very informative, thank you

    Reply
  2. SAN LIN says:
    4 months ago

    D2 standard require to exchange ballast water exchange at sea or not?
    Like Australia ports can directly discharge ballast water into Australia water without by using BEMS?

    Reply

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