石灰、粉煤灰处理铅镉污染土壤的试验研究

试验模拟了Cd，Pb污染土壤，加入石灰、粉煤灰等浸出毒性，试验结果表明，加入质量分数为5％的石灰后，浸出液中的Cd，Pb浸出浓度最低，比模拟污土样品分别降低85．5％，45．2％，其它处理样品的浸出浓度和浸出率都较高，处理效果不理想。Cd，Pb污染土壤进入生活垃圾填埋场之前，添加少量石灰做预处理，是一种较好的方法。另外，浸提刺pH值对Cd，Pb的浸出影响很大。在浸提剂1#（pH值为4．93±0．05）和浸提刺2#（pH值为2．64±0．05）2种浸提剂下，Cd浸出浓度相差约30～40倍，Pb的浸出浓度相差约10～20倍。

Experimental Study on the Treatment of Cd and Pb Polluted Soil by Lime and Fly Ash

Test simulated Cd, Pb-contaminated soil and added lime and fly ash. The results of their leaching toxicity tests show that after adding 5% lime, concentration of Cd, Pb in leaching solution decrease 85.5% and 45.2% respectively. The leaching concentration and leaching rate of Cd and Pd of the remaining samples are high, so the results of treatment are not satisfactory. It is a good way to add a few lime to Cd and Pb polluted soil before the landfill disposal. In Addtion, pH values of extraction solutions af...