Apparatus for eluting and restoring contaminated soil of site with integration of stirring, ultrasounds and microwaves
A soil-contaminated and ultrasonic technology, applied in the field of mechanical equipment, can solve the problems of long aging time, difficult degradation, and difficult volatilization, and achieve the effects of low cost, simple structure, and shortened elution time.
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Embodiment 1
[0018] Example 1: Elution and remediation of soil contaminated by 666 and DDT
[0019] (1) Sampling
[0020] Contaminated soil (soil sample 1) was collected from the surface layer 0-60 cm of the leftover site after the relocation of a 666 and DDT production enterprise in Wuxi, Jiangsu, and the roots, leaves and stones in the soil were removed. The basic physical and chemical properties of the soil are listed in Table 1. It has been determined that the main pollutants in the soil are HCH and DDT, and ∑HCH and ∑DDT are 102 and 6343 mg / kg, respectively.
[0021] Table 1 Basic physical and chemical properties of repaired soil sample 1
[0022]
[0023] (2) Operation process
[0024] The eluent is ethyl acetate, and the above-mentioned soil sample and eluent are placed in the elution tank at a solid-to-liquid ratio of 1:3 (W(g) / V(mL)), and the mechanical stirring and ultrasonic generator are started to process 30min.
[0025] (3) Elution result
[0026] The elution repair ...
Embodiment 2
[0030] Example 2: Elution and remediation of contaminated soil at the Mirex site
[0031] (1) Sampling
[0032] Contaminated soil (soil sample 2) was collected from the lower 20-60cm of the relocation site of an organochlorine pesticide production plant in Liyang, Jiangsu (the surface 0-20cm was not collected because the surface 0-20cm was cement land or concrete). The basic physical and chemical properties of the soil are shown in Table 3, and the concentration of mirex is 8.41mg / kg.
[0033] Table 3 Basic physical and chemical properties of repaired soil sample 2
[0034]
[0035] (2) Operation process
[0036] The eluents are ethyl acetate, acetone and dichloromethane respectively, and the rest are the same as in Example 1.
[0037] (3) Elution result
[0038] Table 4 shows the elution and removal effect of the present invention on mirex-contaminated soil (soil sample 2).
[0039] The primary elution removal rate of mirex in table 4 soil sample 2 (%)
[0040]
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