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The history of scrubbers in the marine market 
 
The 1930s saw the adoption of scrubbing technology to remove sulphur oxides (SOx) and particulate matter (PM) from gaseous emissions in land-based industries.
 
Scrubbing technologies were initially transferred to the marine market as an inexpensive way to produce inert gas for reducing the fire hazard in the cargo tanks of tankers during unloading. During the 1960s, scrubbers were introduced as a method for scrubbing exhaust gas emissions from the tanker’s boiler plant.
 
In 1991, the first prototype scrubber for controlling exhaust gas emissions was installed onboard a ship, enabling thorough cleaning of gas from the main and auxiliary engines, either by the same unit or by two separate installation units.
 
By 1998, the seawater scrubber had advanced enough to enable a comprehensive field trial. The Canadian ice breaker Louis S. St-Laurent was subjected to 22 days of testing during a six-week transatlantic voyage. At the same time, a different scrubber prototype was fitted to the passenger ferry Leif Ericson to investigate washwater quality through the washwater treatment plant. In addition, installations on the Zaandam, the Pride of Kent, and the Suula, not only demonstrated the scrubber’s ability to remove pollutants but also to fit into the space occupied by the silencer to maximise the available cargo space.
 
Due to size and space constraints on ships, scrubbers were further developed to allow a single unit to function for both the main and auxiliary engines.
 

Figure 7 provides a brief timeline of the evolution of scrubbers in the marine market.

 

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