Abstract
In-use emissions aboard a Stalwart class vessel, the T/S State of Michigan, were measured from a four-stroke marine diesel generator operating on two fuels: ultra-low-sulfur diesel (ULSD) fuel and ULSD mixed with Amyris renewable diesel (S33; 33% by volume) produced from sugarcane feedstocks with 67% by volume ULSD. Measurements followed the International Organization for Standardization (ISO) 8178 procedures and protocols. Gaseous emissions reported include nitrogen oxides (NOx), carbon monoxide (CO), and carbon dioxide (CO2), while reported particulate matter (PM) emissions include PM2.5 mass, elemental carbon (EC), and organic carbon (OC). Overall, a 4% reduction in NOx emissions, a 10% increase in CO, and a 2% increase in CO2 were observed with S33. For PM, no statistically significant differences were seen with S33. PM2.5 was dominated by OC for both fuels. Overall, there was a 26% reduction in EC and an 8% reduction in OC with S33.
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