A kind of heavy metal pollution soil remediation method and device
A soil remediation and heavy metal technology is applied in the field of soil remediation methods and devices contaminated by heavy metals, which can solve the problems of large footprint of remediation devices, low heavy metal removal efficiency, and high soil remediation costs, and achieves small footprint and remediation costs. Inexpensive and conducive to large-scale promotion and application
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Embodiment 1
[0031] A soil remediation method polluted by heavy metals, said soil remediation method may further comprise the steps:
[0032] S1: Crush the soil polluted by heavy metals, then add water and stir to form mud;
[0033] S2: Put the mud into the soil remediation device, and use the leaching agent to wash to realize the removal of heavy metals in the soil, and at the same time realize the regeneration and enrichment of heavy metals from the leaching agent by electrochemical methods during the removal process ;
[0034] S3: After the regenerated leaching agent is discharged from the soil remediation device along with the soil, it is centrifuged and then circulated to the eluent inlet of the soil remediation device to perform the circular leaching operation of the soil.
[0035] The moisture content of the mud is 10%.
[0036] The eluent is EDTA-quaternary ammonium salt ionic liquid. The EDTA-quaternary ammonium salt ionic liquid is prepared by the following method: adding EDTA...
Embodiment 2
[0051] The emergency treatment method and device of this embodiment, its treatment method and device are basically similar to Embodiment 1, and its main difference is that the water content of the mud is 20%, and the mass ratio of the eluent to the mud is 6:1, the electrochemical operating condition is 80A DC power supply 501, and the aspect ratio of the lower box 102 is 3:1.
[0052] In the soil remediation method and device of this embodiment, the concentration of nickel in the soil polluted by heavy metals initially is 3.5mg / kg, the concentration of copper is 8.3mg / kg, and the concentration of manganese is 6.9mg / kg. After the treatment, the remaining The concentrations of the heavy metals were respectively 0.33 mg / kg for nickel, 0.32 mg / kg for copper, and 0.15 mg / kg for manganese.
Embodiment 3
[0054] The emergency treatment method and device of this embodiment, its treatment method and device are basically similar to Embodiment 1, and its main difference is that the water content of the mud is 30%, and the mass ratio of the eluent to the mud is 10:1, the electrochemical operating condition is 100A DC power supply 501, and the aspect ratio of the lower box 102 is 5:1.
[0055] In the soil remediation method and device of this embodiment, the concentration of nickel in the soil polluted by heavy metals initially is 5.2mg / kg, the concentration of copper is 10.6mg / kg, and the concentration of manganese is 8.9mg / kg. After the treatment, the remaining The concentrations of the heavy metals were respectively 0.26 mg / kg for nickel, 0.36 mg / kg for copper, and 0.25 mg / kg for manganese.
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