25JUL2019 - NEWS - China to expand discharge ban on open-loop exhaust scrubbers

China will extend a ban on discharging the waste water from open-loop scrubbers to more coastal regions starting in 2020, the country’s maritime authority said in a draft plan. An open-loop scrubber is a device that removes sulphur from the exhaust that comes through a ship’s smokestack but the water used in the removal process, known as wash water, is then discharged from the vessel. Closed-loop systems keep most of the wash water onboard the ship.