重金属Pb和Cd在不同修复材料中的迁移机制

The Transfer Mechanism of Pb and Cd in Different Amendments in the Process of In-situ Chemical Remediation

研究浓缩型(正铵盐型)改良剂和有机型(有机酸型)改良剂在原位修复只受重金属Pb和Cd单独污染的土壤过程中的传质关系.对污染土柱浸泡,并通过分析其水浸取液中Pb、Cd的pH值变化、质量浓度变化来表征其迁移机制.研究结果表明:浓缩型改良剂和有机型改良剂都可以作为经济的重金属污染修复材料使用,但浓缩型改良剂比有机型改良剂修复效果好,修复效果稳定.

Two kinds of amendments on heavy metal in soil. ammonium salt amendment and organic acid amendment were investigated. Their mass transfer relationship in the process of in-situ chemical reme- diation of soil polluted by Pb and Cd were studied, respectively. In order to characterize their migration mechanism, we soaked the Pb and Cd contaminated soil column with water,and we studied the change of concentration of WS-Pb and WS-Cd and pH value of the extract liquid. The results indicate that both of concentrate amendment and organic amendment can be used as economic heavy metal amendments, and the concentrate amendment has a better and more stable performance than organic amendment.