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Development and mechanistic study of phosphate tailings based soil heavy metal prophylactic agents with encapsulated structure for lead stabilization and phosphorus speciation in soils

  • 0School of Resource and Environmental Science, Wuhan University, Wuhan, 430072, Hubei, China.
Journal of Environmental Management +

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December 13, 2024

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December 13, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

This study developed phosphorus-based slow-release soil agents (SLPs) from phosphorus tailings to improve soil health and reduce heavy metal contamination. SLPs enhance soil organic matter and stabilize lead (Pb) through organic phosphorus and microbial activity.

Area Of Science

  • Environmental Science
  • Soil Science
  • Materials Science

Background

  • Solid waste utilization is crucial for environmental remediation.
  • Phosphorus tailings pose disposal challenges but contain valuable elements.
  • Heavy metal contamination, particularly lead (Pb), degrades soil quality.

Purpose Of The Study

  • To develop a novel phosphorus-based slow-release soil agent (SLPs) from phosphorus tailings.
  • To evaluate SLPs' efficacy in improving soil properties and reducing Pb mobility.
  • To investigate the role of organic phosphorus (OP) and microbial communities in Pb stabilization.

Main Methods

  • Acid activation of phosphorus tailings to create SLPs.
  • Encapsulation of calcium (Ca²⁺) and magnesium (Mg²⁺) with sodium alginate for controlled phosphorus (P) release.
  • Analysis of soil P content, soil organic matter (SOM), humic acid, fulvic acid, and various soil P fractions (AP, NAIP, OP).
  • Correlation analysis and microbial pathway assessment for Pb stabilization mechanisms.

Main Results

  • SLPs significantly increased soil P content (0.23 to 2.53 mg/g) and SOM (8.6 to 40.19 g/kg).
  • Soil P pool shifted towards increased non-apatite inorganic phosphate (NAIP) and organic phosphorus (OP).
  • OP proportion increased, and OP combined with microbial communities enhanced Pb stabilization capacity from 7.6-8.4 mg/g to 36.2 mg/g.

Conclusions

  • Phosphorus tailings can be effectively utilized to create SLPs for soil remediation.
  • SLPs improve soil fertility and reduce heavy metal mobility.
  • Organic phosphorus and soil microbial communities play a key role in lead stabilization in treated soils.

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