摘要
研究通过向砷污染底泥中添加FeCl3和Fe（OH）。作为稳定剂，通过五步连续提取法来评鉴其固化效果。结果表明：（1）0．5～5g／kg的FeCl3（以Fe计）使底泥的pH降低了0．01～0．65个单位，而0．5～5g／kg的Fe（OH）。使底泥pH升高0．05～0．11个单位。（2）FeCl3和Fe（OH）。均能降低底泥中交换态砷（A—As）含量，与对照相比，最大添加量（5g／kg）分别使A—As降低了85．71％和10．38％。此外，FeCl3显著降低了底泥中Al—As和ca—As含量，增加了Fe—As含量，对R—As的影响不明显。而Fe（OH）。降低了底泥中Fe—As含量，增加了Ca—As和R—As含量，对Al—As的影响不明显。（3）FeCl3明显降低了底泥中As的TCLP毒性浸出量，而Fe（OH）。却使底泥中As的TCLP毒性浸出量微略增加。综上，FeCl3对固化底泥中的砷具有较好的效果。
A stabilization experiment was conducted in this study, two ferrous materials（FeCl3 and Fe（OH）3 ） were added to the arsenic-contaminated sediment and the sequential extraction procedure was tested to examine the immobilization effects of FeCI3 and Fe（OH）3 on arsenic in sediment. The results showed that： （1）In the addition amounts of FeCI3 （0.5-5 g/kg）, the pH value of sediment reduced by 0.01-0.65. But in the same addition amounts of Fe（OH）a, the pH value of sediment increased by 0.05-0.11. （2）FeCI3 and Fe（OH）3 both reduced active arsenic（A-As） contents in sediment. When the addition amount reached the maximum 5 g/kg, compared with the control, FeCl3 and Fe（OH）3 reduced the active As（A-As） by 85.71%, 10.38%, respectively. Moreover, FeCl3 significantly reduced the contents of Al-bound As（A1-As） and Ca-bound As （Ca-As） and increased Fe-bound As（Fe-As） content, but had no obvious effect on R-As. However, Fe （OH）3 reduced the Fe-As content, but increased the Ca-bound As（Ca-As） and residual As（R-As） content and had no obvious effects on Al-bound As （Al-As）. （3） Compared with the control group, the leaching toxicity of arsenic decreased obviously with FeCI3 treatment and increased slightly with Fe（OH）3. So, the FeCl3 was the effective immobilizers to remediate arsenic-contaminated sediment.
出处
《水土保持学报》
CSCD
北大核心
2014年第1期253-256,共4页
Journal of Soil and Water Conservation
基金
国家科技重大专项"水体污染控制与治理"(2010ZX07212-008)
