New scrubber system
to clean exhaust emissions
on B-class vessels

Royal Wagenborg has ordered Wärtsilä scrubber systems to clean the exhaust emissions from two of its RORO carriers, the ‘Balticborg’ and ‘Bothniaborg’. These will be Wärtsilä’s first deliveries of its scrubber systems
to Royal Wagenborg.

By installing Wärtsilä scrubber systems, the vessels will comply with the regulations covering emissions of sulphur oxides (SOx) while using conventional residual marine fuel (HFO). The Balticborg and Bothniaborg are employed on a long term freight contract with Smurfit Kappa for the weekly shipment of paper products between Haraholmen, Bremen, Sheerness and Terneuzen. These operating routes are located in the Baltic and North Seas’ Sulphur Emission Control Areas (SECA). The retrofitting of these systems will take place in the autumn of this year at the shipyard Royal Niestern Sander.

“Wärtsilä’s experience in scrubber systems for marine applications is unmatched and our reference list is extensive. We have worked closely with Royal Wagenborg for many years, and have clearly demonstrated our capability to deliver a reliable technical solution that will enable these vessels to comply with the most stringent environmental legislation,” says Juha Kytölä, Vice President, Environmental Solutions, Wärtsilä Ship Power. 

The ‘Balticborg’ and ‘Bothniaborg’ are both powered by Wärtsilä 46 main engines. The vessels have 1A Ice Class classification and are designed to operate in temperatures of as low as minus 25°C. The ability to operate in these extreme conditions was also included
in the specifications for the scrubber systems.


“We have enjoyed a successful business relationship with Wärtsilä for many years and have selected Wärtsilä solutions for many vessels in our fleet. This relationship was one of the reasons for deciding Wärtsilä to be the supplier for these scrubber systems.”

Wärtsilä Hybrid Scrubber System

Wärtsilä provides hybrid scrubber system solutions which have the flexibility to operate in both open and closed loop using seawater to remove SOx from the exhaust. This provides a flexibility of operation in low alkaline waters, as well as the open ocean.

When at sea the switch can be made to open loop using only seawater. The sulphur oxides in the exhaust react with the water to form sulphuric acid. Chemicals are not required since the natural alkalinity of seawater neutralizes the acid.

When required to switch to closed loop, for instance whilst entering a port in a low alkalinity area, the natural alkalinity of seawater is boosted by an alkali which uses caustic soda (NaOH) as a buffer. 

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