不同固化剂对底泥重金属稳定化效果的研究

Study of effect of immobilization materials on heavy metal stabilization treatment in sediment

通过浸出毒性方法,考察了CaO、磷酸二氢铵（MAP）、磷酸二氢钙（MCP）、磷酸氢二铵（DAP）、磷酸二氢钠（MSP）和一种镁系胶凝剂M1对底泥重金属的稳定化效果。结果发现,当CaO的添加量为75 g/kg,底泥中Zn、Pb、Ba和Mn的浸出浓度分别降低了72.8%、67.6%、34.9%和94%;当M1的添加量为200 g/kg,Zn、Ba和Mn浸出浓度分别降低了85.1%、76.1%和99%,Pb的浸出浓度降低95%以上;当MAP、MCP、DAP、MSP的添加量为100 g/kg,Zn的浸出浓度下降了70%-85%,Mn的浸出浓度下降了40%-90%,Ba的浸出浓度下降95%以上。此外,MAP、MCP、DAP和MSP的添加使底泥中总磷的浸出浓度显著增大。

Several chemical immobilization materials,CaO,NH4H2PO4（MAP）,Ca（H2PO4）2（MCP）,（NH4）2HPO4（DAP）,NaH2PO4（MSP） and M1 reagent,were evaluated by leaching toxicity experiments to determine their effects on heavy metal stabilization in contaminated sediment.The results show that after the treatment of 75 g/kg CaO,the concentrations of Zn,Pb,Ba and Mn eluted were reduced 72.8%,67.6%,34.9% and 94%,respectively.After the treatment of 200 g/kg M1,the concentrations of Zn,Ba and Mn eluted decreased 85.1%,76.1% and 99%,respectively,meanwhile reducing Pb eluted with a more than 95%.When the addition amounts of MAP,MCP,DAP,MSP were 100 g/kg,70%-85% of Zn eluted,40%-90% of Mn eluted decreased and more than 95 % of Ba eluted declined.In addition,total phosphorus eluted by the treatment of MAP,MCP,DAP,MSP increased markedly.