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1 材料与方法
1.1 材料
1.1.1 供试土样
Table 1 Basic physicochemical properties of soil samples
土样种类 | pH | CEC/ (cmol·kg−1) | 有机质/ (g·kg−1) | TPb/ (mg·kg−1) | TAs/ (mg·kg−1) | TCd/ (mg·kg−1) |
灰棕紫泥 | 8.16 | 38.38±1.43 | 12.85±1.28 | 43.66±3.20 | 5.63±0.55 | 0.63±0.05 |
Table 2 Test samples and kaolin chemical composition %
土样种类 | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | Na2O | K2O |
灰棕紫泥 | 61.42 | 15.45 | 6.48 | 0.80 | 2.72 | 2.70 | 1.40 |
高岭土 | 72.68 | 10.98 | 5.70 | 0.48 | 0.70 | 0.31 | 1.12 |
1.1.2 人工模拟Pb、As、Cd复合污染土壤的制备
Table 3 Level setting of compound pollution soil heavy metal mg·kg−1
重金属污染水平 | Pb | As | Cd |
一般污染 | 600 | 80 | 22 |
中度污染 | 1 200 | 160 | 44 |
重度污染 | 1 800 | 240 | 66 |
1.2 地质聚合物固化重金属复合污染土壤的实验
1.2.1 地质聚合物的制备
Fig. 1 Process of solidifying heavy metal composite contaminated soil by geological polymer
Fig. 1 Process of solidifying heavy metal composite contaminated soil by geological polymer

1.2.2 不同掺土比对地质聚合物固化重金属污染土壤稳定化效果研究
1.2.3 地质聚合物固化不同程度重金属污染土壤稳定化效果研究
1.2.4 分析测定方法
E = (C0-CS)/C0×100%
| (1) |
2 结果与分析
2.1 不同掺土比对地质聚合物固化重金属污染土壤稳定化效果研究
2.1.1 地质聚合物固化Pb、As、Cd复合污染土壤固化体抗压强度测试
Table 4 Compressive strength of solidified body
复合污染土壤掺量/% | 抗压强度/MPa |
0 | 34.35 |
20 | 25.31 |
30 | 21.89 |
40 | 16.39 |
50 | 12.13 |
60 | 7.36 |
70 | 3.06 |
2.1.2 地质聚合物固化Pb、As、Cd复合污染土壤固化体浸出毒性实验
Fig. 2 Influence of heavy metal content on heavy metal leaching concentration
Fig. 2 Influence of heavy metal content on heavy metal leaching concentration

Table 5 Stable efficiency of solidified body %
土壤掺量 | Pb稳定效率 | As稳定效率 | Cd稳定效率 |
20 | 99.19 | 99.79 | 99.38 |
30 | 98.41 | 98.92 | 98.04 |
40 | 98.96 | 98.97 | 98.94 |
50 | 96.37 | 96.41 | 96.32 |
60 | 90.74 | 87.03 | 91.62 |
70 | 61.57 | 68.95 | 59.03 |
2.2 地质聚合物固化不同程度重金属污染土壤稳定化效果研究
Fig. 3 Stabilization effect of geological polymer on heavy metals with different pollution levels
Fig. 3 Stabilization effect of geological polymer on heavy metals with different pollution levels

2.3 污染土壤固化体重金属形态分析
Fig. 4 Comparison of morphological distribution of heavy metal of primitive soil and solidified body
Fig. 4 Comparison of morphological distribution of heavy metal of primitive soil and solidified body

2.4 地质聚合物固化重金属复合污染土壤前后XRD分析
Fig. 5 Soil XRD patterns of different soil ratios
