1278516991595a1267106724867-brochure-o-wartsila-solutions-2015

• Wärtsilä Closed Loop Scrubber SystemThe Wärtsilä closed loop scrubber system is designed to remove SO Xfrom the exhaust and operates utilising wash water. The system workscontinuously in closed loop, which means no unnecessary concernregarding sea water alkalinity levels and is best suited for full timeoperation in low alkalinity areas (e.g. the Great Lakes).In a closed loop scrubber system, the exhaust gas enters thescrubber and is sprayed with sea water that has been mixed withcaustic soda (NaOH). The sulphur oxides in the exhaust react with thismixture and are neutralised. A small bleed-off is extracted from theclosed loop and treated to fulfil IMO requirements. Cleaned effluentscan be safely discharged overboard with no harm to the environment.If operation in zero discharge mode is requested, the effluent canbe led to a holding tank for scheduled and periodical discharge.91