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  • Title: Diesel particulate emissions from used cooking oil biodiesel.
    Author: Lapuerta M, Rodríguez-Fernández J, Agudelo JR.
    Journal: Bioresour Technol; 2008 Mar; 99(4):731-40. PubMed ID: 17368887.
    Abstract:
    Two different biodiesel fuels, obtained from waste cooking oils with different previous uses, were tested in a DI diesel commercial engine either pure or in 30% and 70% v/v blends with a reference diesel fuel. Tests were performed under a set of engine operating conditions corresponding to typical road conditions. Although the engine efficiency was not significantly affected, an increase in fuel consumption with the biodiesel concentration was observed. This increase was proportional to the decrease in the heating value. The main objective of the work was to study the effect of biodiesel blends on particulate emissions, measured in terms of mass, optical effect (smoke opacity) and size distributions. A sharp decrease was observed in both smoke and particulate matter emissions as the biodiesel concentration was increased. The mean particle size was also reduced with the biodiesel concentration, but no significant increases were found in the range of the smallest particles. No important differences in emissions were found between the two tested biodiesel fuels.
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