Performance of a Wet Electrostatic Precipitator in Marine Applications

Anssi Järvinen (Corresponding Author), Kati Lehtoranta, Päivi Aakko-Saksa, Mikko Karppanen, Timo Murtonen, Jarno Martikainen, Jarmo Kuusisto, Sami Nyyssönen, Päivi Koponen, Pekka Piimäkorpi, Eero Friman, Varpu Orasuo, Jaakko Rintanen, Juha Jokiluoma, Niina Kuittinen, Topi Rönkkö

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


Emissions of marine traffic can be lowered by switching to less polluting fuels or by investing in exhaust aftertreatment. Electrostatic precipitation is a widely used method for particle removal but it is not currently used in combination with marine engines. This study presents the particle filtration characteristics of an emission reduction system designed for marine applications and consisting of a scrubber and a Wet Electrostatic Precipitator (WESP) in series. Partial flow of exhaust from a 1.6 MW marine engine, operated with light and heavy fuel oil, was led to the system. Particle concentrations were measured before the system, after the scrubber and after the WESP. Particle removal characteristics were determined for different engine loads. The scrubber alone removed 15–55% of non-volatile particle number, 30–40% of particle mass and 30–40% of black carbon mass depending on engine load, when HFO fuel was used. By studying particle size distributions, scrubber was found also to generate particles seen as an additional mode in 20–40 nm size range. The system combining the scrubber and WESP removed over 98.5% of particles in number, mass and black carbon metrics when HFO fuel was used. With MDO fuel, 96.5% of PN and 99% of black carbon were removed.

Original languageEnglish
Article number393
JournalJournal of Marine Science and Engineering
Issue number2
Publication statusPublished - Feb 2023
MoE publication typeA1 Journal article-refereed


  • black carbon: particulate matter
  • electrostatic precipitator
  • exhaust aftertreatment
  • exhaust emissions
  • marine engine
  • non-volatile particles
  • scrubber


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