<![CDATA[This study aims to purify waste cooking oil-based biodiesel using a dry washing method via centrifugation as a more environmentally friendly alternative to conventional water washing. The process was conducted by varying the centrifuge rotational speeds at 1,050 rpm, 1,150 rpm, 1,250 rpm, and 1,350 rpm, as well as centrifugation durations of 12, 14, 16, 18, and 20 minutes. The effects of these parameters were evaluated based on biodiesel yield, density, kinematic viscosity, and flash point. The results indicated that increasing both the rotational speed and centrifugation time had a significant impact on biodiesel quality. The optimum condition was achieved at 1,150 rpm for 16 minutes, yielding 72% biodiesel with a density of 0.87 g/mL, a kinematic viscosity of 4.7 mm²/s, and a flash point of 102 °C. All parameters met the applicable biodiesel quality standards. These findings demonstrate that the dry washing method using centrifugation is effective in removing contaminants and improving the physical properties of the fuel, making it a practical solution for processing biodiesel from waste-based feedstocks. Moreover, this method has the potential to reduce water usage and minimize wastewater generation, making it a more environmentally sustainable option]]>
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