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重毒性鉛污染土壤清潔高效修復研究進展

Research progress in cleaning and efficient remediation of heavy, toxic, lead-contaminated soil

  • 摘要: 在介紹了鉛元素污染背景、現狀與危害的基礎上,對土壤中鉛的來源、賦存形式及其提取方法進行了詳細介紹。結合土壤修復技術研究現狀,對三大修復方法如物理、化學及生物修復法進行了系統綜述,并從效率、適用性、經濟性等方面評估了3種修復方法的優勢與劣勢,發現化學修復最適合重毒性鉛污染治理。隨之對化學淋洗法和固定化/穩定法作了詳細介紹,探討并評價了不同種類淋洗劑和固化劑的修復機制、修復效果、適用性和應用前景等。最后對未來重毒性鉛污染土壤清潔高效修復提出了展望,修復方法應盡量減少對土壤的破壞;對高鉛污染土壤來說聯合修復技術的發展是土壤修復富有潛力的發展方向;應當盡可能地確定鉛污染土壤修復機制,實現定向修復;同時應加強多功能復合材料的研發。

     

    Abstract: With the rapid development of industrialization and human civilization, the soil polluted by heavy, toxic lead is becoming increasingly severe worldwide. Thus, it is imperative to control soil pollution due to lead. In this paper, the background, status, and harm of lead-polluted soil were introduced, and the source, mode of occurrence, and extraction of lead from the soil were depicted in detail. Based on the current soil remediation technology, three major methods, namely, physical, chemical, and bioremediation, have been systematically reviewed, and their advantages and disadvantages from the aspects of efficiency, applicability, and economy were evaluated and compared. Results reveal that the most preferred remediation method for heavy, toxic, lead-contaminated soil is chemical remediation. The chemical leaching and immobilization/stabilization methods were subsequently introduced in detail, and the remediation mechanism, effect, applicability, and application prospect of the different types of eluants and curing agents were evaluated and discussed. Finally, the prospect of cleaning and efficient remediation of heavy, toxic, lead-contaminated soil was presented. The restoration should minimize the damage to the soil. For the heavy, lead-contaminated soil, the development of the joint remediation technology is the potential development direction. The mechanism of soil remediation and directional remediation should be determined as soon as possible. Meanwhile, the research and development of multifunctional composite materials should be strengthened.

     

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