Measurements of exhaust gases from a marine engine equipped with an open-loop wet scrubber using seawater for sulphur dioxide (SO2) abatement are reported. The scrubber reduces the SO2 emissions effectively to levels corresponding to <0.1% S in the fuel (the level that applies to sulphur emission control areas from 2015). The scrubber also reduces the emissions of particulate matter by mass by 75%. The impact on the number of particles is studied for the total particle number and the solid fraction. The total number of particles is reduced by about 92% and the solid fraction by 48% in the scrubber indicating most effective abatement of volatile particles. Also, the content of polycyclic aromatic compounds in the exhaust is significantly reduced by the scrubber. The captured SO2 gives a low pH and high sulphate content in the scrubber water. The reduction in particulate matter is of the same order as what is obtained with a fuel switch from heavy fuel oil to marine gas oil.
International Maritime Organization (IMO). MARPOL Annex VI and NTC 2008 with guidelines for implementation. 3rd ed (2013 edition). London: CPI Group (UK) Ltd, 2013.
2.
KarleI-MTurnerD. Seawater scrubbing – reduction of SOX emissions from ship exhausts. Gothenburg: Department of Chemistry, Göteborg University, 2007.
3.
HansenJP. Exhaust gas scrubber installed onboard MV Ficaria Seaways (Public test report). København: Environmental Protection Agency, Danish Ministry of Environment, 2012.
4.
United States Environmental Protection Agency (USEPA). Exhaust gas scrubber washwater effluent. EPA-800-R-11-006, November2011. Washington, DC: USEPA.
5.
OikawaKYongsiriCTakedaK. Seawater flue gas desulphurization: its technical implication and performance results. Environ Prog2003; 22: 67–73.
CaiazzoGLangellaGMiccioF. An experimental investigation on seawater SO2 scrubbing for marine applications. Environ Progr Sustain Energ2013; 32: 1179–1186.
8.
AndreasenAMayerS. Use of seawater scrubbing for SO2 removal from marine engine exhaust gas. Energ Fuel2007; 21: 3274–3279.
9.
CorbettJJWinebrakeJGreenEH. Mortality from ship emissions: a global assessment. Environ Sci Technol2007; 41: 8512–8518.
10.
WinnesHFridellE. Particle emissions from ships: dependence on fuel type. J Air Waste Manag Assoc2009; 59: 1391–1398.
11.
IvesRKlokkSN. Exhaust gas sulfur removal by seawater washing, marine diesel engines. In: Proceedings of the 20th international congress on combustion engines, (CIMAC), London1993.
12.
Characterization of the effect of the scrubber system installed on Ficaria Seaways. Project report September 2012 within the project of NaKIM by Danish Technological Institute, FORCE Technology, University of Copenhagen and Alfa Laval Aalborg A/S. http://www.nakim.dk/32713 (accessed 5 November 2013).
MoldanováJFridellEPopovichevaO. Characterisation of particulate matter and gaseous emissions from a large ship diesel engine. Atmos Environ2009; 43: 2632–2641.
15.
Amendments to the technical code on control of emission of nitrogen oxides from marine diesel engines (NOx Technical Code 2008). MEPC 58/23/Add.1, Document 2, ANNEX14, RESOLUTION MEPC.177(58), Adopted on 10 October 2008, http://www.imo.org/blast/blastDataHelper.asp?data_id=23761&filename=177(58).pdf (accessed 5 November 2013).
AgrawalHWelchWAHenningsenS. Emissions from main propulsion engine on container ship at sea. J Geophys Res: Atmos2010; 115: D23205.
18.
HallquistÅMFridellEWesterlundJ. Onboard measurements of nanoparticles from a SCR-equipped marine diesel engine. Environ Sci Technol2013; 47: 773–780.
19.
JonssonÅMWesterlundJHallquistÅM. Size-resolved particle emission factors for individual ships. Geophys Res Lett2011; 38: L13809.
20.
BeeckenJMellqvistJSaloK. Airborne emission measurements of SO2, NOx and particles from individual ships using sniffer technique. Atmos Meas Tech Discuss2013; 6: 10617–10651.
21.
AlföldyBLöövJBLaglerF. Measurements of air pollution emission factors for marine transportation in SECA. Atmos Meas Tech2013; 6(7): 1777–1791.
22.
CooperDAPetersonKSimpsonD. Hydrocarbon, PAH and PCB emissions from ferries: a case study in the Skagerak-Kattegatt-Öresund region. Atmos Environ1996; 30(14): 2463–2473.
