AI Article Synopsis
- This study explores the effectiveness of using dry jet mixing with a new binder (SPC) to solidify and stabilize soil contaminated with heavy metals and high organic matter content.
- The performance of treated soils was measured over time, focusing on factors like electrical conductivity, heavy metal leachability, and soil resistance, showing promising results similar to lab tests.
- Key findings reveal that SPC treatment reduces electrical conductivity, increases soil stability, and significantly lowers the leachability of heavy metals such as lead and cadmium, while improving the soil's ability to neutralize acids.
Article Abstract
In this study, in-situ treatment using dry jet mixing construction method and SPC (single superphosphate and calcium oxide) new binder are used to solidify/stabilize a heavy metal contaminated site soil with relatively high content of organic matters. Time-dependent field performance of the soils at 41 and 326 days after treatment is evaluated, which includes electrical conductivity (EC), leachability of heavy metals and chemical oxygen demand (COD), soil penetration resistance, acid neutralization capacity (ANC), and chemical speciation of heavy metals. The results indicate that the stabilized soils exhibit satisfactory performance which is comparable with the laboratory study. In-situ SPC treatment significantly decreases EC values and increases penetration resistance values of the soils. Leachability of lead, zinc, cadmium and COD decreases with increasing SPC content or curing time. Large percentages of heave metals in the soils are transformed from exchangeable fractions to residual fractions after treatment. These, coupled with the improved ANC, result in low heavy metal leachability in stabilized soils.
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| http://dx.doi.org/10.1016/j.jhazmat.2019.02.031 | DOI Listing |
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