Apparatus for eluting and restoring contaminated soil of site with integration of stirring, ultrasounds and microwaves
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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.
Inactive Publication Date: 2011-10-26
NANJING AGRICULTURAL UNIVERSITY
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[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a mixing, ultrasonic and microwave-integrated machine for complex conditions, high concentration, refractory degradation, refractory volatilization, long aging time, and the restoration of toxic pollutant-contaminated soil. Site Contaminated Soil Elution Remediation Equipment
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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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Abstract
The invention relates to an apparatus for eluting and restoring contaminated soil of a site with integration of stirring, ultrasounds and microwaves. The apparatus is characterized in that: the apparatus comprises a housing and a support; the housing comprises a stirring shaft, an impeller, an elution pot, an ultrasonic generator and microwave generators; and a driving motor and a feed inlet which are connected with the stirring shaft are arranged on an upper part of the housing, and a discharge hatch and a control valve are arranged on a lower part of the housing. The contaminated soil and an eluant are sent to the elution pot through the feed inlet, and the mechanical stirring shaft and the ultrasonic generator or the mechanical stirring shaft, the ultrasonic generator and the microwave generator are respectively started according to characteristics of the contaminated soil to carry out an intensive elution for 30 to 60 min, so the contaminated soil of the site can be restored. The apparatus has the advantages of simple structure and low cost, allows the processing period to be shortened, the elution efficiency to be improved, and the restriction of factors of pollutant sorts, soli types, aging times and the like to be less through simultaneously starting to utilize stirring, ultrasounds and microwaves, and has an important application value to solve a Chinese problem of treating contaminated soil of the site to be urgently restored and exploited.
Description
1. Technical field [0001] The invention relates to a kind of mechanical equipment for the treatment and repair of polluted soil, which mainly realizes the elution and repair of polluted soil through mechanical stirring, ultrasonic and microwave strengthening measures, and is especially suitable for complex conditions, high concentration, refractory degradation, refractory volatilization, and aging time The restoration of long and toxic pollutants (such as organochlorine pesticides, heavy metals, etc.) polluted soil (such as the soil after the relocation of pesticide factories, factories, etc.) belongs to the technical field of contaminated soil treatment and restoration in environmental pollution control. 2. Background technology [0002] With the continuous and rapid development of my country's economy, the continuous expansion of urban scale, the adjustment of economic structure and the implementation process of the "Stockholm International Convention", a large number of pe...
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