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Aims <p>The HDS sediment produced in the treatment of mine wastewater by HDS process (high-density sludge method) has become a difficult problem in the disposal of mine solid waste due to its large storage and low comprehensive utilization rate. This study aimed to explore the effect of phytoremediation method on the ecological restoration of HDS sediment dump.</p> Methods <p>A 5-year field investigation was conducted to examine the effect of revegetating a HDS sediment dump with eight woody plant species, i.e., <i>Ligustrum lucidum</i> L., <i>Ligustrum quihoui</i> L., <i>Robinia pseudoacacia</i> L., <i>Rhus chinensis</i> L., <i>Salix hybrid</i> L., <i>Hibiscus mutabilis</i> L., <i>Nerium indicum</i> L., <i>Hibiscus syriacus</i> L., on the physicochemical properties, nutrients, enzyme activities, microbial activities and heavy metal contents of the HDS sediment.</p> Results <p>The results showed that revegetation significantly improved the physicochemical properties (pH, electrical conductivity, water content, redox potential), nutrients (N, P, K, organic matter), enzyme activities (phosphatase, invertase, urease), microbiological composition and respiration (bacteria, fungi, actinomyces, microbial biomass, respiration intensity) of the HDS sediment. Compared with the control (bare sediment without revegetation), revegetation reduced the contents of Cd, Cu in the sediment. In addition, the contents of DTPA-Cd and DTPA-Cu in the sediment showed a decreasing trend.</p> Conclusions <p>Furthermore, as discovered from the PCA analysis results, <i>R. pseudoacacia</i> has greater restoration potential for copper sulfide acidic wastewater sludge, which was suitable for primary woody plants to repair the HDS sediment dump.&#xa0;</p>

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Phytoremediation as a sustainable tool to rehabilitate land contaminated by high‑density sludge sediment: from waste to green

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Weiwei Wang,
  • Jinchun Xue,
  • Liping Zhang,
  • Min He,
  • Ruoyan Cai,
  • Jiajia You

摘要

Aims

The HDS sediment produced in the treatment of mine wastewater by HDS process (high-density sludge method) has become a difficult problem in the disposal of mine solid waste due to its large storage and low comprehensive utilization rate. This study aimed to explore the effect of phytoremediation method on the ecological restoration of HDS sediment dump.

Methods

A 5-year field investigation was conducted to examine the effect of revegetating a HDS sediment dump with eight woody plant species, i.e., Ligustrum lucidum L., Ligustrum quihoui L., Robinia pseudoacacia L., Rhus chinensis L., Salix hybrid L., Hibiscus mutabilis L., Nerium indicum L., Hibiscus syriacus L., on the physicochemical properties, nutrients, enzyme activities, microbial activities and heavy metal contents of the HDS sediment.

Results

The results showed that revegetation significantly improved the physicochemical properties (pH, electrical conductivity, water content, redox potential), nutrients (N, P, K, organic matter), enzyme activities (phosphatase, invertase, urease), microbiological composition and respiration (bacteria, fungi, actinomyces, microbial biomass, respiration intensity) of the HDS sediment. Compared with the control (bare sediment without revegetation), revegetation reduced the contents of Cd, Cu in the sediment. In addition, the contents of DTPA-Cd and DTPA-Cu in the sediment showed a decreasing trend.

Conclusions

Furthermore, as discovered from the PCA analysis results, R. pseudoacacia has greater restoration potential for copper sulfide acidic wastewater sludge, which was suitable for primary woody plants to repair the HDS sediment dump.