CLOSED loop scrubbers

Seawater used in the process is continuously re-circulated.

How does it work?

  • Exhaust gases are led through the scrubber from the bottom of the scrubber to the top
  • Seawater is inserted at the top of the scrubber through spraying nozzles
    This results in an equally divided spray pattern throughout the scrubber
  • Exhaust gases are washed with the seawater in the scrubber tower
  • The sulphur in the exhaust gases will dissolve in the process water
  • Process water is led to the circulation tank where NaOH is added to neutralize acidity
  • From the process tank water is pumped back again to the scrubber
  • Based on conductivity, process water is drained out of the system automatically
  • If needed clean seawater is added to the process water tank
  • Drained process water is led through the separator
  • The separator will separate solids and oil from the drained process water
  • Sludge is pumped to the sludge storage tank on the ship
  • Cleaned drain water with high conductivity level will be discharged directly to sea while complying fully to IMO regulations
  • The pH, turbidity and concentration of PAH are constantly monitored in accordance with MARPOL Annex VI resolution MEPC.259 (68)
  • The cleaned exhaust gases will leave the scrubber free from sulphur and particles
  • The demister will remove any final moist

More information can be found in our brochure. Download here.

“We were intrigued by the simplicity of the VDL AEC scrubbing system. Their technology works without filters. There is no pollution on the deck, no filters to clean and no maintenance. After testing the VDL AEC Maritime closed loop scrubber on the Schleswig-Holstein we were so convinced, we ordered scrubbing systems for three more vessels.”

Fini Alsted Hansen, Technical Superintendent Fleet Management at Scandlines.