镉污染土壤的固化研究

Study on Solidification of Cadmium Contaminated Soil

实验采用土壤固化技术,研究水泥、粉煤灰、石灰与土壤不同配比对镉污染土壤固化效果影响,结果表明:水泥、石灰、粉煤灰3种固化剂都能有效地对镉污染土壤进行固定化处理,并且随着固化剂比例的增加,固化体抗压强度越高,重金属浸出浓度越低。3种固化剂的固化效果也不同,实验结果分析表明水泥对固化效果的影响最大。当水泥、石灰、粉煤灰混合使用时,固化效果比单独使用时固化效果好,最佳固化比例为水泥用量300%,粉煤灰用量30%,石灰用量10%。

In this paper, soil solidification technology is used to study the influence of different proportions of cement, fly ash, lime and soil on solidifying effect of cadmium contaminated soil. The results show that cement, lime and fly ash can solidify the contaminated soil effectively. With the increase of curing agent added in soil, the compressive strength of the cured body becomes higher and the heavy metal leaching concentration becomes lower. The curing effects of the three curing agents are different. The experimental results indicate that the cement has greatest effect on soil solidification. When the cement, lime, fly ash are mixed together, the curing effect is better than using any one of them separately, the optimal curing ratio is 300% of cement, 30% of fly ash and 10% of lime.