Abstract:

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 situ 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.