The Experts below are selected from a list of 4125 Experts worldwide ranked by ideXlab platform
Yanjun Du - One of the best experts on this subject based on the ideXlab platform.
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field evaluation of a new hydroxyapatite based binder for ex situ solidification stabilization of a heavy metal contaminated site soil around a pb zn smelter
Construction and Building Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Shui WangAbstract:Abstract This study presents a field trial of ex-situ solidification/stabilization of heavy metal contaminated soils using a new hydroxyapatite based binder SPC (superphosphate and calcium oxide). The field performance including electrical conductivity (EC), heavy metal and chemical oxygen demand (COD) Leachability, and penetration resistance of stabilized soils up to 256 days after treatment is investigated. Moreover, acid neutralization capacity (ANC), metal speciation, and soil mineralogy analyses are performed to elucidate the heavy metal immobilization mechanisms. The results indicate that the stabilized soils have lower EC values than untreated soils, indicating the lower soluble salt contents in stabilized soils. Ex-situ treatment can significantly reduce acid soluble fraction contents and Leachability of lead, zinc and cadmium in soils as a consequence. Decrease in COD Leachability is observed during the curing period up to 256 days. Additionally, SPC stabilized soils give superior mechanical properties as indicated by their higher penetration resistance values as compared to the untreated soils. The improvement in ANC and reduction in acid soluble fraction resulting from the formation of phosphate-based precipitates are mainly responsible for the reduced heavy metal Leachability of stabilized soils. Additionally, ex-situ SPC treatment is found to be effective in improving soil spatial homogeneity.
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in situ solidification stabilization of heavy metals contaminated site soil using a dry jet mixing method and new hydroxyapatite based binder
Journal of Hazardous Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Dejun SongAbstract: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.
Dejun Song - One of the best experts on this subject based on the ideXlab platform.
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in situ solidification stabilization of heavy metals contaminated site soil using a dry jet mixing method and new hydroxyapatite based binder
Journal of Hazardous Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Dejun SongAbstract: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.
Fasheng Li - One of the best experts on this subject based on the ideXlab platform.
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field evaluation of a new hydroxyapatite based binder for ex situ solidification stabilization of a heavy metal contaminated site soil around a pb zn smelter
Construction and Building Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Shui WangAbstract:Abstract This study presents a field trial of ex-situ solidification/stabilization of heavy metal contaminated soils using a new hydroxyapatite based binder SPC (superphosphate and calcium oxide). The field performance including electrical conductivity (EC), heavy metal and chemical oxygen demand (COD) Leachability, and penetration resistance of stabilized soils up to 256 days after treatment is investigated. Moreover, acid neutralization capacity (ANC), metal speciation, and soil mineralogy analyses are performed to elucidate the heavy metal immobilization mechanisms. The results indicate that the stabilized soils have lower EC values than untreated soils, indicating the lower soluble salt contents in stabilized soils. Ex-situ treatment can significantly reduce acid soluble fraction contents and Leachability of lead, zinc and cadmium in soils as a consequence. Decrease in COD Leachability is observed during the curing period up to 256 days. Additionally, SPC stabilized soils give superior mechanical properties as indicated by their higher penetration resistance values as compared to the untreated soils. The improvement in ANC and reduction in acid soluble fraction resulting from the formation of phosphate-based precipitates are mainly responsible for the reduced heavy metal Leachability of stabilized soils. Additionally, ex-situ SPC treatment is found to be effective in improving soil spatial homogeneity.
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in situ solidification stabilization of heavy metals contaminated site soil using a dry jet mixing method and new hydroxyapatite based binder
Journal of Hazardous Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Dejun SongAbstract: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.
Fei Wang - One of the best experts on this subject based on the ideXlab platform.
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field evaluation of a new hydroxyapatite based binder for ex situ solidification stabilization of a heavy metal contaminated site soil around a pb zn smelter
Construction and Building Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Shui WangAbstract:Abstract This study presents a field trial of ex-situ solidification/stabilization of heavy metal contaminated soils using a new hydroxyapatite based binder SPC (superphosphate and calcium oxide). The field performance including electrical conductivity (EC), heavy metal and chemical oxygen demand (COD) Leachability, and penetration resistance of stabilized soils up to 256 days after treatment is investigated. Moreover, acid neutralization capacity (ANC), metal speciation, and soil mineralogy analyses are performed to elucidate the heavy metal immobilization mechanisms. The results indicate that the stabilized soils have lower EC values than untreated soils, indicating the lower soluble salt contents in stabilized soils. Ex-situ treatment can significantly reduce acid soluble fraction contents and Leachability of lead, zinc and cadmium in soils as a consequence. Decrease in COD Leachability is observed during the curing period up to 256 days. Additionally, SPC stabilized soils give superior mechanical properties as indicated by their higher penetration resistance values as compared to the untreated soils. The improvement in ANC and reduction in acid soluble fraction resulting from the formation of phosphate-based precipitates are mainly responsible for the reduced heavy metal Leachability of stabilized soils. Additionally, ex-situ SPC treatment is found to be effective in improving soil spatial homogeneity.
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in situ solidification stabilization of heavy metals contaminated site soil using a dry jet mixing method and new hydroxyapatite based binder
Journal of Hazardous Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Dejun SongAbstract: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.
Arul Arulrajah - One of the best experts on this subject based on the ideXlab platform.
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field evaluation of a new hydroxyapatite based binder for ex situ solidification stabilization of a heavy metal contaminated site soil around a pb zn smelter
Construction and Building Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Shui WangAbstract:Abstract This study presents a field trial of ex-situ solidification/stabilization of heavy metal contaminated soils using a new hydroxyapatite based binder SPC (superphosphate and calcium oxide). The field performance including electrical conductivity (EC), heavy metal and chemical oxygen demand (COD) Leachability, and penetration resistance of stabilized soils up to 256 days after treatment is investigated. Moreover, acid neutralization capacity (ANC), metal speciation, and soil mineralogy analyses are performed to elucidate the heavy metal immobilization mechanisms. The results indicate that the stabilized soils have lower EC values than untreated soils, indicating the lower soluble salt contents in stabilized soils. Ex-situ treatment can significantly reduce acid soluble fraction contents and Leachability of lead, zinc and cadmium in soils as a consequence. Decrease in COD Leachability is observed during the curing period up to 256 days. Additionally, SPC stabilized soils give superior mechanical properties as indicated by their higher penetration resistance values as compared to the untreated soils. The improvement in ANC and reduction in acid soluble fraction resulting from the formation of phosphate-based precipitates are mainly responsible for the reduced heavy metal Leachability of stabilized soils. Additionally, ex-situ SPC treatment is found to be effective in improving soil spatial homogeneity.
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in situ solidification stabilization of heavy metals contaminated site soil using a dry jet mixing method and new hydroxyapatite based binder
Journal of Hazardous Materials, 2019Co-Authors: Yanjun Du, Fasheng Li, Chunping Li, Arul Arulrajah, Fei Wang, Dejun SongAbstract: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.