Environmentally friendly regeneration of used energy oils Abror Aliev, Sayyora Ganieva, Bakitjan Smanov, Bobirjon Adizov and Bekzod Rakhimov E3S Web of Conf., 390 (2023) 05043 Published online: 01 June 2023 DOI: 10.1051/e3sconf/202339005043