Denmark bans scrubber discharges form 2025

Denmark’s government has joined the growing list of countries taking action against open-loop scrubbers, having reached a “broad political agreement” to ban the discharge of washwater from scrubbers into its waters, starting next year.

The ban that covers ships with open-loop scrubbers out to 22 km from the Danish coasts comes into force on July 1, 2025.

The scrubbers became widespread after tighter sulphur regulations were introduced in the North Sea and the Baltic Sea in 2015, and especially after global sulphur regulations came into force in 2020. The shipping companies could then choose to comply with the new regulations by either cleaning the sulphur smoke with a scrubber or switching to fuel with a lower sulphur content. 

The Danish Environment Ministry said the use of open-loop scrubbers has contributed to excessive levels of a number of heavy metals and tar substances in the marine environment and that the agreement to prohibit such actions in Danish waters could reduce the discharge of nickel into the sea by up to 20% and anthracene by 7%.

Ships will be required to switch to using either low-sulphur fuel or closed-loop scrubbers. The ban on closed-loop scrubber discharges will come into force in July 2029. The agreement also states that Denmark would work for a similar ban in the Baltic Sea and North Sea through the regional maritime conventions.

Other countries, including China, Saudi Arabia, Singapore, Turkey and many European ports and regions, have already banned the use of open-loop scrubbers.