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To explore the remediation of the surface soil of coal-based solid waste dumps by biochar, viscous sludge and ryegrass and the risk of HM pollution, five heavy metals (HMs), Pb, Zn, Cd, Ni and Cu, were represented by pot experiments. Different proportions of anaerobic and membrane-treated water jet loom sludge (0%, 5%, 15%) and biochar (0%, 3%) were added to the contaminated soil, and ryegrass was used as a soil HM extraction plant. The results showed that the addition of biochar and sludge increased the soil organic matter content by 7.7 times compared with the control group and reduced the activation rates of Pb and Ni by 62% and 71%, respectively. Under low sludge ratio, biochar had a significant passivation effect on Pb, Ni and Cu, which could reduce the pollution risk of sludge to soil HMs. The simultaneous application of biochar and sludge could improve the enrichment capacity of ryegrass for Zn, followed by Cd and Cu. The combined application of biochar, sludge and ryegrass could reduce the pollution risk index of Cd in the surface soil of coal-based solid waste dumps. In the actual sludge application process, its application ratio can be reduced, and biochar and plants can be used to control the HM risk at the same time.

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Restoration of Heavy Metals and Pollution Risk Analysis of Surface Soil in Coal-Based Solid Waste Dump Using Biochar, Viscous Sludge and Ryegrass

  • 会议论文

  • 发表日期：

    2025年

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  • Mengmeng Jiang,
  • Chongwei Zhong,
  • Die Hu,
  • Jiu Huang

摘要

To explore the remediation of the surface soil of coal-based solid waste dumps by biochar, viscous sludge and ryegrass and the risk of HM pollution, five heavy metals (HMs), Pb, Zn, Cd, Ni and Cu, were represented by pot experiments. Different proportions of anaerobic and membrane-treated water jet loom sludge (0%, 5%, 15%) and biochar (0%, 3%) were added to the contaminated soil, and ryegrass was used as a soil HM extraction plant. The results showed that the addition of biochar and sludge increased the soil organic matter content by 7.7 times compared with the control group and reduced the activation rates of Pb and Ni by 62% and 71%, respectively. Under low sludge ratio, biochar had a significant passivation effect on Pb, Ni and Cu, which could reduce the pollution risk of sludge to soil HMs. The simultaneous application of biochar and sludge could improve the enrichment capacity of ryegrass for Zn, followed by Cd and Cu. The combined application of biochar, sludge and ryegrass could reduce the pollution risk index of Cd in the surface soil of coal-based solid waste dumps. In the actual sludge application process, its application ratio can be reduced, and biochar and plants can be used to control the HM risk at the same time.