重金属污染河道疏浚底泥稳定化实验研究

Experiment on stabilization of bottom sediment in river polluted by heavy metal

以底泥浸出毒性为指标,采用了直观分析、方差分析和单因素分析,探索了生石灰、磷酸二氢钾和天然斜发沸石协同作用对重金属稳定化效果。结果表明:生石灰、磷酸二氢钾稳定重金属效果显著,沸石效果较差;最优配比为底泥∶生石灰∶磷酸二氢钾∶天然斜发沸石为100∶6∶6∶0,底泥中Mn、Cd、Pb、Cu、Zn浸出浓度分别降低了96.6%、95.9%、98.7%、99.5%、94.7%;固化剂达到最优配比时,重金属浸出毒性满足填埋场污染物控制标准和上海市污水综合排放标准,为填埋处理和资源化提供了依据。

Taking sediment leaching toxicity as an index,the paper used visual analysis, variance analy-sis and single factor analysis to explore the effect of quicklime, potassium dihydrogen phosphate and natu-ral clinoptilolite synergistic reaction on stabilization of heavy metals.The results show that quicklime and potassium dihydrogen phosphate have significant influence on heavy metal stabilization, while the natural clinoptilolite has poor effect.The optimum ratios of sediment, quicklime, potassium dihydrogen phos-phate and natural clinoptilolite are 100∶6∶6∶0.In this case, the leaching concentrations of Mn, Cd, Pb, Cu, Zn are reduced by 96.6%, 95.9%, 98.7%, 99.5%, 94.7% respectively.When the curing agent achieved the optimum ratios, the heavy metals leaching toxicity satisfied the standard for pollution control on the landfill site of municipal solid waste and integrated wastewater discharge standard of Shang-hai.The result can provide reference for landfill disposal and recycling.