Air emissions

New IMO regulations require shipping to reduce their air emissions, especially in Emission Controlled Areas (ECAs).

Sulfur dioxide emissions are successively reduced by limiting the Sulfur Content of marine fuels. The Sulfur limits is 0.10% since1st January 2015 in ECAs and 0.50% beginning 1st  January 2020 globally. Next to the use of low Sulfur fuels the Sulfur dioxide can also be reduced by Exhaust Gas Cleaning Systems (EGCS). Marena Ltd. carried out the environmental impact assessment of the first EGCS (seawater scrubber) on board of a ship and analysed it over several years. The results of this study fed into the IMO MARPOL Annex VI washwater discharge Guidelines. From this experience we learned the process and chemistry of EGCS and can help you with the analysis of such systems. Marena currently consults the German Environment Agency in this matter.

Greenhouse gases (GHG) emitted by shipping contribute to climate Change. According to the IMO GHG study international shipping contributes 2.7% of CO2 emissions on a global scale. Measures and Technologies to reduce the CO2 emissions are available, but costly. Together with CE Delft we analyzed all existing GHG reducing methods and technolgies plus the barriers of shipowners to install them.

Marena worked together with a team for the EU DG climate to analyse the different methods to measure fuel consumption and CO2 emissions of shipping. The results will feed into the new MRV Regulation.

Another huge problem of marine shipping is the emission of soot or more exactly Black Carbon. Marena is currently working on its second Black Carbon measurement campaign together with DNV GL and MAN and is involved in international discussions. The project is funded by the German Environment Agency. We try to find out which are the best options to reduce Black Carbon emissions from marine traffic. In a measurement campaign we found that the fuel oil quality has a direct impact on Black Carbon emissions, especially the aromatic content of the fuels.

Maritime Coatings and Paints:

In recent years Marena was involved in several projects related to the development of antifouling procedures, developments of material, study of environmental impacts and general product development.

Ballast water Treatment

The introduction of invasive marine species into new environments by ships’ ballast water, attached to ships’ hulls and via other vectors has been identified as one of the four greatest threats to the world’s oceans.

Air emissions

New IMO regulations require shipping to reduce their air emissions, especially in Emission Controlled Areas (ECAs).

Oil in water

There are many sources for mineral oil in the marine environment, but the biggest source is accidential oil spills.

November 17, 2019

17.-21. February 2020: IMO PPR 7

New results of a Black Carbon measurement campaign submitted by Germany. The results show that the new marine 2020 0.50% sulfur fuels may contain a large fraction of aromatic compounds, which have a direct impact on Black Carbon emissions. Download the PDF here:


Company Type: British Limited
Company No: 5185495
Registered at Companies House, Cardiff
Managing Director:
Dr. Brigitte Behrends
Marena Ltd
St. Annenstr. 27
26441 Jever
Tel: +49 4461 984098
Mobile: +49 162 2443484

Local Branch: Jever
HRB 205310
UstID: DE271117300

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