Effect of Waste and Bleaching Earth oil Derived Biodiesel on Diesel Engine Performance and Emissions

In recent years many researchers have done studies about biodiesel as alternative fuel and renewable diesel fuel and its impact on the performance of compression ignition engines and their pollutions. The application of biodiesel has been limited due to its higher cost compared with petroleum-based diesel. Biodiesel is produced from biological sources such as vegetable oil and animal fat. Nowadays, researchers attempt to find low cost and non-edible resources for biodiesel production. In the current investigation, spent bleaching earth oil biodiesel (SBE) is obtained from spent bleaching earth oil that is Which is a by-product of corn oil refining process. The obtained biodiesel (SBE) sample and waste cooking oil biodiesel (WCO) were evaluated and compared with diesel fuel. The results for engine performance in maximum torque and engine speed of 1600 rpm, both biodiesel fuels decreased the soot emission with % 12.5 and increased the NOx with % 6.4 compared with diesel fuel. In the maximum engine speed (i.e. 2800 rpm), SBE biodiesel had positive effect on specific fuel consumption comparing to diesel and shows lower specific fuel consumption comparing to diesel at full load. On the other hand, brake thermal efficiency was approximately % 3.6 improved relative to diesel fuel.