Closed- Loop Mode
The scrubber works continuously in closed loop, means that one does not need to worry about sea water alkalinity levels. This system is best suited for full time operation in low alkalinity areas(e.g.Great Lakes) and fresh water areas(e.g. rivers and lakes).
In a closed loop scrubber system, the exhaust gas enters the scrubber and is sprayed with water that has been mixed with NaOH. The sulphur oxides in the exhaust react with the mixture and are neutralized. The bleed-off washing water is treated to fulfil IMO requirements and can be safely discharged overboard with harmless to the environment.
If operation in zero discharge mode is requested, the effluent can be led to a holding tank for scheduled and periodical discharge.