| 羟基磷灰石和氯化钾联用修复铅锌矿区铅镉污染土壤的研究 |
| 摘要点击 2876 全文点击 2563 投稿时间：2010-07-26 修订日期：2010-09-27 |
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| 中文关键词 铅镉污染土壤 羟基磷灰石 氯化钾 TCLP 土壤修复 |
| 英文关键词 lead and cadmium contaminated soil hydroxyapatite KCl TCLP soil remediation |
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| 中文摘要 |
| 以湖南凤凰铅锌矿区的2个重金属污染土壤（HF-1、HF-2）为研究对象，利用组合制剂羟基磷灰石（HA）加氯化钾（KCl）修复矿区铅镉污染土壤，目的是探讨Cl-对HA修复重金属铅镉污染土壤的作用.每个实验土壤设置5个HA水平和4个KCl水平，共计40个处理，采用美国固体废弃物毒性浸提程序(TCLP)评价修复效果.结果表明，HA能够有效地降低污染土壤中的TCLP浸提态铅和镉；组合制剂在HA∶Pb∶KCl摩尔比为8∶1∶2时对土壤铅和镉的固化效果达到最佳，该处理下土壤HF-1、HF-2中铅和镉的固化率分别达到83.3%、97.27%和35.96%、57.82%；在HA∶Pb摩尔比为8的水平上，KCl∶Pb摩尔比为2时土壤HF-1、HF-2中铅和镉的固化率比未添加KCl时分别提高6.26%、0.33%和7.74%、0.83%.研究表明，适量的Cl-存在可以提高羟基磷灰石对重金属铅镉污染土壤的修复效果. |
| 英文摘要 |
| The composite agents containing potassium chloride (KCl) and Hydroxyapatite(HA) were used to remediate the lead and cadmium contaminated soil in Fenghuang lead-zinc mining-smelting areas, Hunan province. The objective of this study was to identify and evaluate the influence of Cl- to the fixing efficiency of Pb and Cd by HA. Two types of contaminated soil (HF-1, HF-2) were chosen and forty treatments were set by five different Hydroxyapatite (HA) dosages and four different Cl- dosages.The toxicity characteristic leaching procedure (TCLP) was used to evaluate the results. It showed that HA could efficiently fix the Pb and Cd from TCLP form. The maximum Pb-fixing efficiency and Cd-fixing efficiency of two types of soil were 83.3%, 97.27% and 35.96%, 57.82% when the HA∶Pb∶KCl molar ratio was 8∶1∶2.Compared to the fixing efficiency without KCl, KCl at the KCl∶Pb molar ratio of 2 improved Pb-fixing efficiency and Cd-fixing efficiency by 6.26%, 0.33% and 7.74%, 0.83% respectively when the HA∶Pb molar ratio was 8.Generally, Cl- can improve the Pb/Cd-fixing efficiency in heavy metal contaminated soil by Hydroxyapatite. |
