Context:

Among the sources of biodiesel, waste cooking oil is a potential alternative fuel to reduce the emission of greenhouse gases from diesel engines without considerable technological changes.

Method:

In this study, the experiments were performed under stable conditions on a single-cylinder four-stroke diesel engine using three different blends of pure diesel fuel with biodiesel made from waste cooking oil (B10, B20 and B30) and commercial diesel fuel B5. The engine ran at variable speed between 1000 - 1600 rpm, at full load and variable engine loads corresponding to the effective power at 1600 rpm.

Results:

The experimental results show that smoke opacity of B10, B20, and B30 is lower compared to the commercial B5 at 0.3%, 24% and 46% respectively, when evaluated at nominal speed 1600 rpm and at full load. However, by increasing the engine load at a constant speed of 1600 rpm, smoke opacity reached its maximum value with B20 compared to other fuels used.

Conclusions:

It is feasible to use biodiesel made with waste cooking oil in blends with pure and commercial diesel to reduce the effects of toxic emissions such as particulate matter (soot) of diesel engines on the environment. Therefore, recycling waste cooking oil significantly reduces environmental problems.