Field intensity compensation method for constructing inhomogeneous field through auxiliary electrode

A non-uniform electric field and auxiliary electrode technology, applied in the fields of botanical equipment and methods, restoration of polluted soil, biocides, etc., can solve the problems of large spatial variability of residues and inability to achieve the remediation efficiency of organic contaminated soils. Achieve the effect of improving the overall space repair efficiency, solving the contradiction of the consistency of removal efficiency, and avoiding spatial differences

Active Publication Date: 2016-07-06
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the heterogeneity of the spatial distribution of the concentration of organic pollutants in the soil, and the degradation efficiency is related to the electric field strength, under the condition of a uniform electric field, the spatial variability of the residual amount of pollutants after remediation is very large, and it is impossible to realize the overall degradation of organic pollutants. Repair efficiency up to standard

Method used

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  • Field intensity compensation method for constructing inhomogeneous field through auxiliary electrode
  • Field intensity compensation method for constructing inhomogeneous field through auxiliary electrode
  • Field intensity compensation method for constructing inhomogeneous field through auxiliary electrode

Examples

Experimental program
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Embodiment 1

[0050] The contaminated soil repaired in this example is the oil-contaminated soil configured in the laboratory. The soil collected is clay, and the impurities and grass roots visible to the naked eye are removed. After being naturally air-dried indoors, it is passed through a 2mm sieve. Oil pit, mixed into 40g / kg~50g / kg oil-contaminated soil, let it air-dry for 7 days, after the oil and soil are evenly mixed, use deionized water to adjust the moisture content to 25%, and put it into the electric repair reaction tank Inside (20cm long x 20cm wide x 15cm high).

[0051] The spatial distribution of the concentration of petroleum pollutants was collected in the reaction tank through the grid method, and a total of 25 samples (5×5) were collected. Infrared spectrophotometry was used to measure the concentration of petroleum pollutants into oil content mean μ=44.5g / kg, standard deviation δ=7.2g / kg, and spatial variation coefficient CV=16.2%. Taking the sum of the mean value and th...

Embodiment 2

[0067] The difference from Example 1 is:

[0068] The mean value of oil content of the concentration of petroleum pollutants is μ=34.3g / kg, the standard deviation δ=8.8g / kg, and the spatial variation coefficient CV=25.7%. Taking the sum of the mean value and the standard deviation of the pollutant concentration, that is, μ+δ=43.1g / kg as the threshold, the spatial distribution of the pollutant concentration is divided into a high-concentration area and a low-concentration area. Among them, the high concentration area accounts for 20.7% of the total area, and the low concentration area accounts for 79.3% of the total area.

[0069] Such as figure 2 middle diagram 2-1 ~ figure 2 As shown in -4, in this embodiment, due to the distance relationship between the auxiliary electrode and the matrix electrode, it satisfies Therefore, if figure 2 As shown in -3, assume that the polarity of the matrix electrodes is the same, and the polarity of the auxiliary electrode is opposit...

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Abstract

The invention relates to a field intensity compensation method for constructing an inhomogeneous field through an auxiliary electrode. The field intensity compensation method includes the following steps that the distribution position of the auxiliary electrode is designed in a matrix electrode unit according to the pollutant concentration spatial distribution; the polarity of the auxiliary electrode is designed according to the position relationship between the auxiliary electrode and a matrix electrode; and the inhomogeneous field is constructed through the auxiliary electrode and the matrix electrode, and space compensation for the intensity of the field is achieved. According to the pollutant concentration spatial distribution, on the basis of the matrix electrode, the inhomogeneous field matched with a pollutant concentration field is constructed through space distribution and polarity setting of the auxiliary electrode, the contradiction between the pollutant spatial distribution heterology and the homogeneous field removal efficiency consistency is overcome, the spatial difference of the organic contaminated soil electrokinetic remediation efficiency is avoided, and the overall electrokinetic remediation spatial remediation efficiency is accordingly improved.

Description

technical field [0001] The invention relates to the restoration technology of organic polluted soil, in particular to a field strength compensation method for constructing a non-uniform electric field through an auxiliary electrode. Background technique [0002] Electric method to remediate organic polluted soil is a new emerging technology. In the existing electrokinetic restoration process, a pair of electrodes is inserted into the contaminated soil, and a weak direct current is applied to form an electric field. Under the joint action of electrochemical reaction and electrokinetic effect, organic pollutants in soil can be effectively removed. [0003] In the previous research process, M×N matrix electrodes were arranged in an equidistant grid, and a fully covered uniform electric field was formed through periodic positive and negative polarity switching, (CN102294350B). However, due to the heterogeneity of the spatial distribution of the concentration of organic polluta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C05G3/80
CPCB09C1/085B09C1/08C05G3/80B09C1/10A01N25/00B09C1/00
Inventor 郭书海吴波李凤梅王卅
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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