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Pasteurisation for ballast water treatment

BAWAT claims it is “on the verge” of US Coast Guard approval for its ballast water pasteurisation system.

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While the number of ports and states around the world banning open loop scrubbers that discharge treated ballast water over the vessel continues to grow, a Danish company called BAWAT says its open loop system using pasteurisation to treat ballast water is “a wake up call” for the industry.


“BAWAT’s system – which is built from off the shelf components, utilises no chemicals or filters, and works simply by heating ballast water – has now passed all USCG land based tests and has only one shipboard test left to complete,"said the company. This is scheduled for April in the ‘difficult’ waters (high organism levels) of Port Klang, Malaysia and the Mekong River estuary, Vietnam. The system has already passed three tests here with “flying colours, eliminating all organisms”, added BAWAT CEO Kim Diederichsen.


“All of the tests so far – onboard and onshore – have demonstrated rock solid results,” continued Diederichsen. “By that I mean, not near the threshold of compliance, but total efficacy. This shows what we’ve known all along, that the tried and tested process of pasteurisation is THE best way to eliminate the potentially harmful invasive species carried in ballast water.”


BAWAT’s system uses waste heat produced by a vessel’s engine to heat ballast water while sailing. “It really is that simple,” Diederichsen stresses. “We’ve been through the development phase, are sailing through testing and are now commercialising this revolutionary product. We’ve already signed a series of fleet agreements and have been shortlisted for many more. The shipowners we’re talking to are seeing this as a wake up call – ballast water compliance doesn’t have to be so difficult!


“With vessels now mandated to install ballast systems we believe we’ve timed this just right. The years to come will be very busy times for retrofitting, especially in 2021/22, and we have the system and organisation ready and raring to go.”


The current USCG testing is being carried out onboard a 38.000 DWT container vessel, with DHI Denmark and Lloyds Register onboard as partners. Michael Andersen, R&D Manager at BAWAT, added that USCG approval is expected in the second half of 2019.

BAWAT's mobile BWMS in a container is a port-based option.
BAWAT's mobile BWMS in a container is a port-based option.

As well as a vessel-based system, BAWAT offers a mobile BWMS in a container for ports. Once connected to the ship’s ballast water piping, ballast water is pumped through the mobile BWMA using the ship’s ballast pump and treated for discharge “in full compliance with the IMO criteria for ballast water discharge”, claims BAWAT.

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