Migration and Transformation of Heavy Metals During the CO 2 -Assistant Thermal Treatment of Oily Sludge

Jiantao Li, Fawei Lin (), Xuan Guo, Chujun Luan, Hongdi Yu (), Rundong Li, Beibei Yan and Guanyi Chen
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Jiantao Li: School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
Fawei Lin: School of Environmental Science and Engineering, Tianjin University/Tianjin Key Lab of Biomass/Wastes Utilization, Tianjin 300072, China
Xuan Guo: School of Environmental Science and Engineering, Tianjin University/Tianjin Key Lab of Biomass/Wastes Utilization, Tianjin 300072, China
Chujun Luan: School of Environmental Science and Engineering, Tianjin University/Tianjin Key Lab of Biomass/Wastes Utilization, Tianjin 300072, China
Hongdi Yu: School of Environmental Science and Engineering, Tianjin University/Tianjin Key Lab of Biomass/Wastes Utilization, Tianjin 300072, China
Rundong Li: School of Energy and Environment, Shenyang Aeronautical University, Shenyang 110136, China
Beibei Yan: School of Environmental Science and Engineering, Tianjin University/Tianjin Key Lab of Biomass/Wastes Utilization, Tianjin 300072, China
Guanyi Chen: School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China

Energies, 2024, vol. 17, issue 22, 1-12

Abstract: Thermal treatment has significant advantages in resource recovery for oily sludge (OS). However, the instability of heavy metals (HMs) within the residue poses a considerable risk of secondary pollution. This study explored the migration and transformation of HMs from OS under varying conditions (i.e., temperature, constant-temperature duration time, and different ratios of O 2 and CO 2 ). The elevation of the pyrolysis temperature augmented the decomposition of organic matter and total petroleum hydrocarbons (TPHs). However, the increased temperature also diminished the stabilization of HMs, and facilitating the HM’s transfer to oil and gas, particularly for HMs (i.e., As and Pb) with low boiling points. The constant-temperature duration time exhibited a weak impact on HM transformation, but the internal heating mechanism of microwave pyrolysis promoted the stabilization of HMs through vitrification. The existing O 2 with oxidizing properties facilitated the oxidation of organic matter and TPHs to CO 2 and H 2 O, which also promoted the transformation of HMs into oxidized states for stabilization. Comparatively, CO 2 promoted the thermal cracking and disrupted the stability of HMs to a certain extent. Above all, this work revealed the migration and transformation of HMs in OS varied with the thermochemical methods and possessed an important significance for the immobilization and stabilization of HMs.

Keywords: oily sludge; pyrolysis; heavy metals; CO 2 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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