An open-loop scrubber discharges sulfuric scrubber wash water, which contains gaseous and particulate emissions removed from the exhaust gases into sea. More ports adopt stricter environmental regulations to fight ocean acidification, which makes it difficult for vessels to operate with an open-loop scrubber. As of today, more than 120 ports worldwide have banned open-loop scrubber discharge. And in November 2020, the European Parliament’s environmental committee voted to out-phase and banned open-loop scrubbers. Bans especially apply in high-traffic areas, such as ports and canals. According to Safety4Sea, it is prohibited to discharge scrubber wash water or have an open-loop scrubber in many ports and territorial waters, including:

  • Bahrain (within port limits)
  • Belgium (ports and inland waters)
  • Bermuda (territorial waters)
  • China (territorial waters)
  • Egypt (Suez Canal)
  • France (specific ports)
  • Germany (inland waters and ports bordering inland waters)
  • Gibraltar (local waters)
  • Ireland (within the ports of Cork, Dublin, and Waterford)
  • Lithuania (port waters)
  • Malaysia (territorial waters)
  • Norway (heritage fjords)
  • Pakistan (within port limits)
  • Panama (the Panama Canal)
  • Portugal (port waters)
  • Scotland (within the ports of Forth and Tay)
  • Singapore (within port limits)
  • Spain (within the port of Algeciras)
  • Sweden (within the port of Brofjorden)
  • UAE (within Fujairah and Abu Dhabi port limits)
  • USA (within Connecticut port waters and Californian waters)

Banning Open-Loop Scrubber

These are only some of the ports and territorial waters. The restrictions continue to develop rapidly, and many more global ports are expected to join the ban on open-loop scrubber discharge soon to protect sensitive waters from ocean acidification and embark on a sustainable future.  

If a vessel with an open-loop scrubber wants to enter some of the listed areas, it will have to convert to a hybrid scrubber or a closed-loop scrubber. Alternatively, it can also switch to a more expensive compliant fuel containing a lower amount of sulfur.

Although local regulations are a great start, it is just the beginning. Therefore, it is also expected that the International Maritime Organization (IMO) will sanction a new work plan at its next Marine Environment Protection Committee (MEPC), discussing environmental issues under IMO’s remit. This new work plan focuses on aligning the regulations and bans for open-loop scrubber wash water discharges internationally. The 76th MEPC session is to be held in June 2021.

By installing or converting to a closed-loop scrubber, you take an active part in reducing pollution for a better world. Likewise, you are prepared for future regulations, which guarantees that you can continue your operation without interruptions.

Learn more about how you comply with open-loop scrubber bans and the IMO 2020 sulfur cap here.

New call-to-action

Want to learn more?

Visit our Marine Knowledge site to learn everything worth knowing about marine scrubbers, wash water treatment, and how to comply with the IMO 2020 sulfur cap.

Download Marine Industry Knowledge Ebook

Liked this blog post? Then we think these are just for you


Marine Industry Knowledge

An open-loop scrubber discharges sulfuric scrubber wash water, which contains gaseous and particulate emissions removed ...