Exhaust gas cleaning on ships

Seagoing vessels emit large amounts of sulfur oxides by burning heavy fuels. There are a number of ways to reduce this pollution. One way to combat this is by cleaning the flue gases in exhaust gas cleaning scrubber systems, also called marine gas scrubbers. Magnesium hydroxide is a safe and efficient product for flue gas cleaners on ships.

Environmental legislation for marine fuel

On 1 January 2015, the rules were changed regarding the emission of sulfur oxides (SOx) in so-called Sulfur Emission Control Areas (SECAs). These areas consist of the Baltic Sea, the North Sea, North America and the Caribbean of the United States. From 1 January 2020, the areas outside the SECAs must also comply with new regulations. The rule is that marine fuels may contain a maximum of 0.10% sulfur (previously 1%). These regulations have been introduced to significantly reduce sulfur dioxide concentrations in the air.


To comply with the new legislation, the shipping industry can use a primary and secondary approach. A primary approach is to adjust the fuel, a secondary approach is the cleaning of exhaust fumes. MH53S MARE, a magnesium hydroxide produced by Nedmag, makes the secondary approach possible.


The flue gas from ships can be effectively cleaned by reacting it with Mg(OH) in a scrubber. In this emission reduction method, it is important to accurately dose the magnesium hydroxide. The stable product ensures that you can always work within these narrow limits. An alternative is to use caustic soda. Caustic soda is a corrosive substance, which requires additional safety measures. The main advantage of Mg(OH) is that the product is harmless. This makes it possible to work safely and efficiently on ships.

  • Safe operations
  • Stable product
  • Support from Nedmag and partner Timab

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