文献类型：期刊文献

英文题名：Energy Recoveries and Migrations of Heavy Metals from Different Oily Sludges by Pyrolysis and Solvent Extraction

作者：Wang, Zi[1]; Yuan, Mengxia[2]; Wang, Jie[1]

机构：[1] Department of Chemical Engineering for Energy, East China University of Science and Technology, Engineering Research Center of Resource Utilization of Carbon-containing Waste with Low-carbon Emissions, Ministry of Education, 130# Meilong Rd., Shanghai, 200237, China; [2] Tialoc [Shanghai] Environmental, Ltd., 159#, Tianzhou Rd., Shanghai, 200233, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240040844)

语种：英文

外文关键词：Heavy metals - Metal recovery - Pyrolysis - Solvents - Trace elements - Wastewater treatment

摘要：This work is devoted to an investigation into the energy recoveries and trace element mitigations of four oily sludges by pyrolysis and Soxhlet solvent extraction. The oily sludges included a tank bottom sediment (OS-1), a scum from wastewater separator (OS-2), a waste oil adsorbed on white clay (OS-3), and a settling from wastewater treatment (OS-4). While the pyrolysis liquid product of OS-1 showed a single phase, those of three other oily sludges displayed two separate phases of oil and aqueous product. Via the pyrolysis, 73.0–88.3% of energy were recovered as the oil from OS-1, OS-2 and OS-3, but only 13.3% from OS-4 with 68.0% of energy being occupied by the aqueous product. Sixteen trace elements were quantified, and OS-2 and OS-4 were found to have relatively high contents of heavy metals. The study tried a correlation between the evaporation rates and the extraction rates to shed light on the mitigation behaviors of different trace elements varying with pyrolysis temperatures and oily sludges. Except for Cd, As and Se, all other trace elements in all four oily sludges exhibited an enrichment in the pyrolysis residues, but only Ni in the pyrolysis residue of OS-4 posed a moderate potential ecological risk. ? 2024, The Authors. All rights reserved.