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Outline
Thorough mixing of contaminated soil and stabilizer is essential for effective ex-situ stabilization for heavy metals-contaminated soils. Field tests of ex-situ soil stabilization was conducted, and the total elements, moisture content, and leaching concentrations of target heavy metals (including arsenic(As) and antimony(Sb)) in the stabilized soils were measured. The influence of mixing equipment type, and soil-stabilizer mixing frequency on the ex-situ stabilization efficiency was evaluated. Based on the measured total elemental content and moisture content, a concept termed 'mixing uniformity' was proposed. The results showed the multi-function mixing equipment performed better than screening crushing bucket in controlling the uniformity of stabilizers in the contaminated soil. In contrast, the screening crush bucket significantly improved the uniformity of total As and Sb in the soil, with a larger mixing range. The mixing uniformities of total element content, moisture content, and As and Sb leaching concentrations increased with the number of mixing using the screening crushing bucket. When the number of mixing exceeded three, As and Sb leaching concentrations fell below remediation target values. Additionally, the uniformity of As and Sb leaching concentrations showed a good correlation with the uniformity of total contents. Based on the results, it is recommended that on-site rapid testing of total heavy metal content, combined with uniformity analysis, can be used to evaluate the mixing uniformity of contaminated soil and stabilizers during stabilization processes.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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