Kurita BWMS

Kurita BWMS is based on the principle of injecting biocide into the ballast water flow during ballasting, this process is controlled by a TRO monitor ensuring that the correct dosage level is maintained. The biocide is mixed into the water stream by a mixing plate. The unique composition of the biocide ensures compliance without the use of filtration. During deballast, a neutralization agent is used if needed to ensure that the residual TRO is kept below 0,1ppm.

The simple design principle of Kurita BWMS ensures easy installation with little modifications required to existing piping. Containerized solutions of the system are available for deck installations on vessels with limited installation space. The only modifications needed to the main ballast line are limited to, fitting sample ports, biocide injection port, mixing plate (can be installed in a flange) and a flowmeter. The system can be fitted on most vessels without expensive pipe modifications making the installation both simple and cheap.

Why choose Kurita BWMS?
  • Easy operation
  • Simple installation
  • No filtration
  • Full ballast flow in all water qualities
  • No restrictions on turbidity or salinity
  • Extremely low power consumption (4-8KW during ballasting)
  • Small footprint
  • Easy maintenance
  1. Biocide

The active component of the biocide used in the system is sodium hypochlorite (NaOCl), a compound which is widely used for cleaning and disinfection. Biocide is stored onboard in a storage tank kept at 15 degrees, the biocide can be delivered in 200L drums or 1-2 IBC containers. The system is fitted with a filling connection located on deck for ease of filling the biocide tank.

  1. Neutralizer

The neutralizer used by the system is sodium sulfite, purchased in granular form. Kurita BWMS can work with commercially available granular sodium sulfite. Granular sodium sulfite is dissolved into freshwater in the TRO-N tank.

Corrosion protection

Kurtia BWMS injects a biocide dosage of 15ppm TRO during the ballast operation, this dosage and the unique composition of the biocide ensures that the ballast water is in compliance without the use of filters. Kurita have carried out an external corrosion evaluation at the National Maritime Research Institute in Japan to research the effect of the TRO dosage on: tank coatings, damaged coating, lining, uncoated elements and gaskets. The tests were conducted over 6 months with a dosage of 20ppm TRO with control tanks with salt water, the tests concluded that the TRO dosage did not affect coating breakdown or corrosion.


Kurita BWMS is IMO G8/G9 approved and can be installed and operated on vessels in worldwide trade except for the US national territory. The system is currently being tested at golden bear research center in the US for its USCG and revised G8/G9 Type Approval, this approval process is conducted in close cooperation with DNV-GL.

IMO Type Approval
Kurita is fully compliant with the IMO Ballast Water performance standards and complies with all the requirements in the International Convention for the Control and Management of Ships’ Ballast Water and Sediments.