The characteristics of waste, cooking oil biodiesel by non-catalytic methods Bellina Yunitasari, Yuli Panca Asmara, Aris Ansori, Muhaji, Aisyah Endah Palupi, Handini Novita Sari and Dany Iman Santoso BIO Web Conf., 171 (2025) 02010 Published online: 04 April 2025 DOI: 10.1051/bioconf/202517102010