Sea Tech Week® 2022
      • Le 28/07/2022
      • Discover the content of the session: "New fuels: behavior in aquatic environments and responses to accidental spills"

      • Synthesis of the behavior in aquatic environment and the risks in terms of transport by sea of new fuels (Ammonia; LSFO: Low Sulphur Fuel Oil; VLSFO: Very Low Sulphur Fuel Oil; ULSFO: Ultra-Low Sulphur Fuel Oil; HVO: Hydrotated Vegetable Oil; LNG: liquefied natural gas; etc), whether they are used for the propulsion of ships or for the supply of distribution plants. Presentation of the European IMAROS project (new generation of LSFO).
      • Session1a.jpg
      • Picture: Cedre



        CEDRE (France)



        TUESDAY 27th SEPTEMBER 2022

        9.30am-12.30am including a coffee break



        Mr Christophe Logette
        Director of Cedre



        • Introduction and Cedre presentation
          By Christophe Logette(199), Director
          (199) Cedre, France











        Fanny Chever
        • Improving response capacities and understanding the environmental impacts of new generation low sulphur MARine fuel Oil Spills (IMAROS)
          Fanny Chever(199)
          (199) Cedre, France

        In the frame of IMAROS project, co-funded by the EU / DG-ECHO, 13 LSFO (11 VLSFO and 2 ULSFO) were collected and analysed at the laboratory scale. Analyses consisted in a physical-chemical screening in order to give a first indication of the products’ characteristics.

        The chemical composition of the fuels is basic data to understand how a spill behaves when released into the sea. Fresh oils were characterised by their viscosity and density, at 5°C and 15°C, flash point, pour point, asphaltenes and waxes contents, evaporation rate and chemical composition. Dispersibility tests were conducted at 15°C in order to evaluate the efficiency of this response option.

        Artificially weathered samples were also characterized to assess the oil weathering. The main result from this screening phase is the high variability of the samples implying different behaviours and response options if accidentally released. Viscosity of the fresh oils ranged from < 400 mPa.s at 15°C to solid oils. Persistency in the environment should be observed with evaporation rate ranging from 3% to 28%. Pour points of the fresh oils varied from -27°C to +27°C, leading to potential difficulties to recover some oils with conventional oil spill response equipment.

        Some fresh oils exhibited a potential for chemical dispersibility with efficiency slightly higher than 50% for IFP tests.

        Based on the results from this screening, the most relevant samples were selected for in-depth analysis of weathering properties in flume tank and testing of toxicity. Response techniques will also be studied on the selected samples.






        Ronan Jézequel

        • Fate, Behaviour and Impact Assessment of New Generation of Biodiesels and Biofeedstocks in Case of an Accidental Spill 
          Ronan Jézequel(199)
          (199) Cedre, France

        Following an accidental spill of biodiesel in inland waters (France, 2016), Cedre and TotalEnergies decided to initiate a project to understand the fate and behaviour of biodiesels and biofeedstocks in case of release in fresh or marine waters. Two biodiesels (B10 and Hydrogenated Vegetable Oil-HVO) and two biofeedstocks (Tallow Oil- TO, Used Cooking Oil-UCO) were selected. The influence of natural weathering processes were assessed at laboratory and pilot scale in Cedre’s flume tank. The different parameters measured were density, viscosity, emulsification, oil adhesion, natural dispersion and biodegradability. In addition, the ecotoxicity of the four products were compared through normalised tests on marine bacteria (Vibrio fischeri) and marine algae (Phaeodactylum tricornutum).

        Due to their high pour point, the two biofeedstocks TO and UCO (transported at 60°C) rapidly solidify after release in water. Due to agitation, the slick breaks up into 2-3 cm diameter pieces for TO and up to 5 cm diameter balls for UCO. The products then tend to emulsify progressively without any change in the floating behaviour being observed. The two biofeedstocks do not present any toxicity towards the 2 marine species tested and they are highly biodegradable.

        Regarding the biofuels, they tend to disperse progressively after 2-3 days of aging. However, this natural dispersion remains dependent on surface agitation. Under low hydrodynamic conditions, the biofuels slick is observed at the surface and has a low emulsification rate (not more than 20%). Concerning the ecotoxicity measurements, HVO is not toxic while B10 can be considered as toxic towards the marine bacteria.




        • Ammoniac and LNG
          Olivier Gentilhomme(200)   
          (200) Institut national de l'environnement industriel et des risques (Ineris), France
  • Campus mondial de la mer
  • Union Européenne
  • Région Bretagne
  • Brest Métropôle
  • Technopôle Brest Iroise
  • Crédit Mutuel ARKEA
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