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Ports, terminals, and shipyards all over the world are constantly seeking to improve their service and reduce their environmental impact.
At the same time, flexibility is key, which is why Bawat has developed a mobile, containerized and self-sufficient solution for efficient ballast water treatment based on pasteurization technology.
About pasteurization
Pasteurization was invented by French scientist Louis Pasteur in 1862. Pasteur discovered that heating beverages was enough to kill most of the bacteria that caused spoilage, preventing these beverages from turning sour. Today, pasteurization is still used widely in the dairy industry and other food processing industries to achieve food preservation and food safety
How we use pasteurization
Bawat BWMS is based on unique patented technology, that represents maybe the simplest solution to an ecological and regulatory issue within the international shipping industry.
The heart of the Bawat system is the pasteurizing unit. Here, the ballast water is heated to a certain temperature via plate heat exchangers. Depending on the treatment temperature applied, ballast water is kept at this elevated temperature for a short period. The combination of elevated temperature and retention time in the pasteurizing unit ensures efficient elimination of all living organisms. Within the regeneration section of the unit, the already treated ballast water pre-heats the in-coming water resulting in low power requirements and high energy efficiency.
Technology
Installation
Bawat’s mobile ballast water treatment units are designed for fast deployment, flexible installation and reliable operation in ports, terminals, shipyards and dry docks.
The system is containerised allowing it to be installed dockside, on a barge, or temporarily onboard a vessel. Installation requires minimal site preparation and can typically be completed within a short timeframe, ensuring limited disruption to ongoing operations.
Once connected to the vessel’s ballast water discharge line, the mobile unit treats ballast water in a single pass, without the use of chemicals or filters. The technology performs consistently across all water qualities – including turbid, muddy or biologically challenging waters – making it suitable for contingency situations as well as planned operations.
Technology description
The process is monitored and controlled from the Control and Monitoring Unit (CMU).
01.
The untreated ballast water is pumped from the sea chest to the regeneration section, where the pre-heating of the water takes place.
02.
The water is then being pumped to the heating section, where it reaches the pasteurizing temperature and flows to the retention section.
03.
After passing the retention section the water is pasteurized and fulfills the required outlet criteria - no holding time or further treatment required.
04.
The treated water is cooled down in the regeneration section, where the heat is transferred to the incoming ballast water.