Optimization of fuel modification parameters for effective and environmentally-friendly energy from plant waste biodiesel

Abstract

Sustainable energy production from plant waste and non-edible seeds offers a promising pathway towards mitigating climate change, reducing environmental impact, promoting economic development, and enhancing energy security. Although several research works have focused on the conversion of Bauhinia seed waste to biooil as a sustainable energy, none of the studies attempted to improve its overall performance through fuel modification and parameter optimization. This study proposes a novel approach by blending water and 2-Ethylhexyl nitrate (2-EHN) into Bauhinia racemose biodiesel (BRD) to minimize emissions and enhance performance. The biodiesel properties were characterized by Fourier-transform infrared and Gas chromatography-mass spectrometry analysis. The optimum levels of fuel modification parameters, such as BRD, water, and 2-EHN in conventional diesel fuel (CD), were obtained using response surface methodology, branding it as a sustainable and greener energy source for engine applications. Box-Behnken design matrix was chosen to categorize input factors, levels, and output responses. Examination of the biodiesel reveals that carbon-based constituents make a significant contribution, and the physicochemical properties align with ASTM standards. The optimization results indicate that the optimum levels of BRD, water, and 2-EHN in CD are 20.33 %, 10.26 %, and 2.05 %, respectively. The performance and emission metrics closely match the projected values. An in-depth examination of combustion, engine vibration, life-cycle assessment, and techno-economic analysis provides further evidence to reinforce the findings and suggests possible avenues for future research.