IMO Ballast Water Management Convention

The IMO adopted the Ballast Water Management (BWM) Convention in 2004. It will enter into force on September 8, 2017. 

Discharge Standards

IMO - International Marine OrganizationBallast water discharge standards are set by IMO Regulation D-2, which establishes numerical limits for different size classes of organisms that may be released in specified volumes of water.

  • In the largest organism size class – organisms greater than or equal to 50 micron – vessels must discharge less than 10 viable organisms per cubic meter.
  • In the mid-range – organisms less than 50 micron and greater than or equal to 10 – vessels are required to discharge less than 10 viable organisms per milliliter.
  • Specific concentrations of indicator microbes are set for the smallest size organisms (smaller than 10 micron).

Compliance Timeline

At its 71st meeting – which took place in July 2017 – the Marine Environment Protection Committee (MEPC) reached a compromise on compliance dates for ballast water discharge.

With the BWM Convention entering into force on September 8, 2017, shipowners will be required to comply with either D-1 (ballast water exchange) or D-2 (ballast water treatment) standards until such time as it is required that they comply only with the D-2 standard.

Newbuild ships must install ballast water treatment systems if constructed (keel-laid) on or after September 8, 2017. For existing ships, shipowners are required to install a ballast water treatment system at the time of its International Oil Pollution Prevention (IOPP) survey on or after September 8, 2019.

Our IMO Type Approval

Trojan Marinex Ballast Water Treatment (BWT) product suite has obtained International Maritime Organization (IMO) Type Approval from Det Norske Veritas (DNV) on behalf of the Norwegian Maritime Directorate.