| 丁旭彤,蒋建国,李德安,李天然,王佳明.钙基固化剂对钒矿污染土壤固化效果的研究[J].农业环境科学学报,2016,35(2):274-280. |
| 钙基固化剂对钒矿污染土壤固化效果的研究 |
| Immobilizing effects of calcium-based agents on soil contaminated by vanadium ore |
| 投稿时间：2015-09-22 |
| DOI：10.11654/jaes.2016.02.010 |
| 中文关键词: 重金属污染土壤 钙基固化剂 钒 铬 |
| 英文关键词: heavy metal pollution calcium-based immobilizing agent vanadium chromium |
| 基金项目:丹江口库区小流域特色矿产重金属污染全过程控制关键技术研究与示范(2015ZX07205-003) |
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| 中文摘要: |
| 针对国内外对钒矿污染土壤修复研究少的现状,选择氧化钙、氯化钙、羟基磷灰石三种钙基固化剂对钒矿污染土壤进行固化效果研究。结果表明:在中性环境下,三种钙基固化剂分别在0.5%、1%、2%添加量时,对钒(V)的固化率由高到低依次为氧化钙>氯化钙>羟基磷灰石,对铬(Cr)的固化效果为氧化钙优于氯化钙和羟基磷灰石;除添加2%氯化钙外,其他固化剂的不同添加量均降低了V的伴生重金属Cd、Cu、Pb、Zn的浸出量;在添加量2%、固化3 h时,氧化钙对V和Cr的固化率分别达到99.0%和38.6%;氧化钙固化污染土壤后,V的残渣态比例为22.9%,比固化前提高了76.2%。 |
| 英文摘要: |
| There are not many investigations available regarding the remediation of vanadium(V)-contaminated soil. Here three calcium-based immobilizing agents, i.e. calcium oxide, calcium chloride, and hydroxyl-apatite, were employed to investigate their immobilizing effects on V-contaminated soil. Results showed that the efficiency of different agents for immobilizing V exhibited in order of calcium oxide> calcium chloride> hydroxyl-apatite, at a rate of 0.5%, 1%, and 2%, respectively, under neutral-pH conditions. Calcium oxide showed a better immobilizing efficiency for Cr than calcium chloride and hydroxyl-apatite did. In acidic conditions, calcium oxide was still better in immobilizing V than calcium chloride and hydroxyapatite were. Calcium oxide and calcium chloride increased Cr immobilization, but hydroxyapatite promoted Cr leaching under acidic conditions. After 14 d of treatment, the immobilizing efficiencies did not change over time. The releases of other V-accompanied heavy metals, i.e. Cd, Cu, Pb, and Zn, were reduced by all three agents at all rates, expect calcium chloride at 2%. Applying calcium oxide at 2% immobilized V and Cr by 99.0% and 38.6%, respectively, after a 3-h. In calcium oxide treatment, soil residual V was 22.9%, which increased by 76.2% as compared to the untreated soil. |
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