In 2020, container ships were responsible for ** percent of all scrubber washwater discharged worldwide. Bulk carriers and oil tankers accounted for ** percent and ** percent of global scrubber water discharges globally, respectively.
Scrubber washwater is a byproduct of vessel scrubbers. These are employed to remove nitrogen oxides (NOx), sulfur oxides (SOx), and other air pollutants from exhaust gases generated by engines, usually by spraying sea water over exhaust gases. This mixture of seawater and pollutants removed from exhaust gases - called scrubber washwater - is then discharged overboard. Scrubber washwater can seriously harm marine organism.
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ICCT. (April 29, 2021). Distribution of scrubber washwater discharged by ships worldwide in 2020, by ship type [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 01, 2026, from /statistics/1267357/distribution-of-discharged-scrubber-washwater-worldwide-by-ship-type/
ICCT. "Distribution of scrubber washwater discharged by ships worldwide in 2020, by ship type." Chart. April 29, 2021. ÌÇÐÄÆƽâ°æ. Accessed August 01, 2026. /statistics/1267357/distribution-of-discharged-scrubber-washwater-worldwide-by-ship-type/
ICCT. (2021). Distribution of scrubber washwater discharged by ships worldwide in 2020, by ship type. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 01, 2026. /statistics/1267357/distribution-of-discharged-scrubber-washwater-worldwide-by-ship-type/
ICCT. "Distribution of Scrubber Washwater Discharged by Ships Worldwide in 2020, by Ship Type." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 29 Apr 2021, /statistics/1267357/distribution-of-discharged-scrubber-washwater-worldwide-by-ship-type/
ICCT, Distribution of scrubber washwater discharged by ships worldwide in 2020, by ship type ÌÇÐÄÆƽâ°æ, /statistics/1267357/distribution-of-discharged-scrubber-washwater-worldwide-by-ship-type/ (last visited August 01, 2026)
Distribution of scrubber washwater discharged by ships worldwide in 2020, by ship type [Graph], ICCT, April 29, 2021. [Online]. Available: /statistics/1267357/distribution-of-discharged-scrubber-washwater-worldwide-by-ship-type/
