钢渣对酸性重金属污染土壤的修复研究进展

改良剂原位固定技术是重金属污染土壤修复的重要措施，其中选择经济有效的改良剂是该技术的关键。本研究主要介绍了具有碱性富硅特性的炼钢副产品钢渣对酸性重金属污染土壤的修复效果及作用机制，以期为重金属污染土壤修复提供理论参考。首先分析了改良剂固定技术的研究现状；然后介绍了钢渣的主要理化性质，阐述了其对污染土壤pH及重金属活性的影响；最后论述了钢渣对喜硅植物生长的促进作用及对其重金属耐性的增强机制。通过分析表明：施用钢渣能同时调控重金属在土壤和植物2个系统中的迁移和转化，能够减少重金属向食物链的迁移，在酸性重金属污染土壤修复实践中具有重要的潜在应用价值。

A Review of the Effects of Steel Slag on Remediation of Heavy Metal Contaminated Acidic Soil

In situ immobilization with amendments was an important method for remediation of heavy metal contaminated soil, and the selection of cost-effective amendments was the key of this measure. The effects and mechanisms of steel slag, alkaline by product rich silicon, on remediation of heavy metal contaminated acidic soil were mainly expounded in this paper to provide theory reference for remediation of heavy metal contaminated soil. Firstly, we briefly introduced the research progress of in sittL immobilization with amendments. Then the major physic-chemical properties of steel slag, its effects on soil pH and heavy metal phytoavailability were analyzed. Finally, we elaborated the promoting effects of steel slag on plant growth and its enhancement effects on heavy metal tolerance mechanisms of plants enriching silicon. From above analyses, we supposed that the application of steel slag could be a potential strategy to remediate metal contaminated acidic soil by simultaneously modifying the restraint and sequestration processes of heavy metal in both soil and plant.