WP 5 - Environmental footprint
Progress status November 2011
Life Cycle Assessment (LCA) method was applied to estimate the emissions to air. The study supports the need for LCA when evaluating the environmental impact of fuel selection. When evaluating the fuel options the focus should be in the whole GHG entity instead of single parameter. Calculating the global warming potential enables the comparison between CO2 and CH4 emissions. Equally, the NOx and SOx emissions comparison is possible by calculating the acidification potential.
Figure: The impact assessment was restricted to calculation of global warming potential (GWP) and acidification potential (AP)
Waste water emissions were covered qualitatively.The nutrient load from waste water discharges can be minimised by using AWT designed for nutrient removal or by using PRF when possible. The adverse effects of the ballast water discharges can be minimised by installing a type approved, state-of-the-art treatment technology onboard while keeping in mind the challenging operational environment of the vessel and restrictions it may pose.
Traditional LCA does not include accidental impacts. Acute oil spills in Arctic waters and oil combating technologies have been reviewed as a separate task. The final report will also include considerations for oil spill response options in the CIV Arctic vessel.