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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Jiantao Li & Fawei Lin & Xuan Guo & Chujun Luan & Hongdi Yu & Rundong Li & Beibei Yan & Guanyi Chen, 2024. "Migration and Transformation of Heavy Metals During the CO 2 -Assistant Thermal Treatment of Oily Sludge," Energies, MDPI, vol. 17(22), pages 1-12, November.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:22:p:5545-:d:1515199
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    References listed on IDEAS

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    1. Gamji M’Rabiu Abubakari & Martez D. R. Smith & Donte T. Boyd & S. Raquel Ramos & Courtney Johnson & Juan L. Benavides & Megan Threats & Junior L. Allen & Camille R. Quinn, 2022. "Assessing Different Types of HIV Communication and Sociocultural Factors on Perceived HIV Stigma and Testing among a National Sample of Youth and Young Adults," IJERPH, MDPI, vol. 19(2), pages 1-11, January.
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