利用磷进行铅污染土壤原位修复中需考虑的几个问题

Factors needed to be re-considered during in-situ remediation practices of Pb-polluted soils with P

  • 摘要: 由于土壤中磷与铅形成难溶性的磷酸铅类化合物Pb5(PO4)3X, X=Cl?, OH?, F?等, 利用不同廉价含磷物质进行铅污染土壤原位修复被认为是目前最好的铅污染土壤管理措施, 受到国内外广泛关注。本文对目前国内外利用磷进行铅污染修复研究的现状进行了综述, 对该研究领域中的关键问题, 如磷酸铅类化合物形成的反应动力学过程控制、最佳pH、土壤中磷/铅摩尔比等进行了较深入的探讨, 并展望了今后的研究方向, 以期为铅污染土壤的修复及其效果评价提供参考。

     

    Abstract: The presence of phosphorus (P) and lead (Pb) in soil can lead to the formation of highly insoluble minerals of Pb5(PO4)3X (where X can be Cl?, OH?, F?, etc.). Hence low-cost phosphate-containing materials utilization was proposed as the best management practice (BMP) for remediation of Pb-polluted soils. Current studies involving in-situ remediation of Pb-polluted soils via phosphorus-compounds are reviewed in this paper. Key factors controlling pyromorphite formation kinetic, solution optimal pH and P/Pb molarity ratio, etc. are discussed in detail. Meanwhile, prospective studies are also discussed with the view to providing further information on remediation practices and their efficiencies in dealing with Pb-polluted soils.

     

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