Device and method for monitoring electric field for electrokinetic remediation of contaminated soil

A technology for electric remediation and contaminated soil, applied in electrostatic field measurement and other directions, can solve problems such as soil medium heterogeneity, difference between electric field strength and theoretical value, etc., to improve the efficiency of electric remediation and optimize electric field conditions.

Active Publication Date: 2015-04-15
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0004] As a complex medium different from water, the spatial distribution of the electric field intensity of soil under the condition of an external electric field can only be obtained by theoretical calculation (Li et al., 2010), and the inhomogeneity of the soil medium causes the actual electric field intensity Spatial difference from theoretical value

Method used

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  • Device and method for monitoring electric field for electrokinetic remediation of contaminated soil
  • Device and method for monitoring electric field for electrokinetic remediation of contaminated soil
  • Device and method for monitoring electric field for electrokinetic remediation of contaminated soil

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Embodiment 1

[0040]The contaminated soil repaired in this embodiment is the oil-contaminated soil configured in the laboratory. The soil collected is brown soil, which is passed through a 2mm sieve after natural air-drying in the room. The oil is collected from an oil pit in Shuguang Oil Production Plant of Liaohe Oilfield, and the oil content is 50g. / kg oil-contaminated soil. After oil and soil are mixed evenly, divide into 4 treatments, adjust the moisture content with deionized water to 5%, 10%, 15% and 25% respectively, and pack into the soil box respectively (long 30cm * wide 30cm * high 10cm ).

[0041] in contaminated soil according to image 3 Four electrodes 6 are arranged as shown. The electrode 6 is made of graphite electrode, with a diameter of 1cm and a height of 11cm. The applied voltage is 30V, and the polarity of the two adjacent electrodes is kept opposite. Timing switching at intervals of 4 hours. in contaminated soil according to image 3 Probe 1 is arranged, and th...

Embodiment 2

[0053] The polluted soil to be repaired is heavy metal cadmium polluted soil, the soil is sandy soil, and the cadmium content is 10ppm. Divide into 4 treatments, adjust moisture content to 10%, 15%, 20% and 25% with deionized water respectively, and pack into soil boxes (length 20cm×width 10cm×height 10cm) respectively.

[0054] in contaminated soil according to Figure 5 Four electrodes 6 are arranged as shown. The electrode 6 is made of graphite electrode with a diameter of 1 cm and a height of 11 cm. The applied voltage is 20V, and the polarity of the electrodes is not switched. in contaminated soil according to Figure 5 Probe 1 is arranged as shown, the material of probe 1 is iron-nickel alloy, the length of the probe is 10 cm, and the diameter is 1 cm.

[0055] The specific operation process includes:

[0056] The probe 1 is evenly inserted into the electric restoration soil 3, and is connected with the A / D module 9 inside the main control unit 2 through wires; the el...

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Abstract

The invention relates to a device and a method for monitoring an electric field for electrokinetic remediation of contaminated soil. The device comprises a probe and a master control unit, wherein the master control unit comprises an electrode polarity detecting module, a reference negative pressure calibration module, an A/D (Analogue-to-Digital) module, a field intensity conversion module and a control module. The probe is inserted into the soil which is subjected to electrokinetic remediation; an acquired voltage signal is output to the master control unit; the master control unit conducts reference calibration and analogue-to-digital conversion on the voltage signal and calculates an electric field intensity value according to preset parameter. The method comprises the following steps: processing the voltage signal of the contaminated soil acquired by the probe, and calculating the electric field intensity value according to the set parameters, so that the electric field intensity during an electrokinetic remediation process of the contaminated soil is monitored in real time. According to the device and the method, the electric field intensity during the electrokinetic remediation process of the contaminated soil can be monitored in real time, and the electrokinetic remediation efficiency is effectively improved.

Description

technical field [0001] The invention relates to the technical field of soil electric field monitoring in electrokinetic restoration, in particular to an electric field monitoring device and method for electrokinetic restoration of polluted soil. Background technique [0002] Electrodynamic remediation of polluted soil is currently an emerging technology. The electrokinetic remediation of polluted soil is to insert electrodes into the polluted soil to form an electrode matrix, apply a weak direct current to form an electric field, and under the action of electrokinetic effect, the pollutants in the soil can be effectively removed. [0003] Previous research results have shown that during the electrokinetic remediation process, the degradation efficiency of organic pollutants in soil is positively correlated with the potential drop (Li et al., 2014), and the migration rate of heavy metal pollutants is also closely related to the electric field strength. Therefore, electric fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/12
Inventor 郭书海吴波邹志红李凤梅李刚
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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