CN104515911A - Device and method for monitoring electric field for electrokinetic remediation of contaminated soil - Google Patents
Device and method for monitoring electric field for electrokinetic remediation of contaminated soil Download PDFInfo
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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
The present invention relates to soil electric field monitoring technical field in electro reclamation, is a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils and method specifically.
Background technology
Electric repair method contaminated soil is current a kind of emerging technology.Electrokinetic Remediation of Polluted Soils is inserted in contaminated soil by electrode, forms electrode matrix, applies faint direct current and form electric field, under the effect of electro-kinetic effect, effectively can remove the pollutant in soil.
Early-stage Study result shows, in electro reclamation process, the degradation efficiency of organic contaminants in soil and potential drop exist positive correlation (Li et al., 2014), and the migration rate of heavy metal contaminants is also closely related with electric field intensity.Therefore, the electric field index such as electric field intensity is the key factor affecting Electrokinetic Remediation of Polluted Soils efficiency.
As the complex dielectrics being different from water, the space distribution of the electric field intensity of current soil under extra electric field condition only can obtain (Li et al. by theory calculate, 2010), and the inhomogeneity of soil media, cause the spatial diversity between actual electrical field strength and theoretical value.In addition, electric field index, except the impact by impressed voltage, is also subject to the impact of soil property, such as soil types, water percentage, base cation total amount etc.And in Electrokinetic Remediation of Polluted Soils process, the electro-kinetic effect such as electrolysis, electromigration, all causes the change of the electricity indexs such as electric field intensity.
How the change in time and space of the electricity index such as electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process, to Electric Field Distribution in regulation and control electro reclamation process, improves the spatially uniform of electrokinetic remediation efficiency, keeps the high efficiency of electro reclamation significant.
Summary of the invention
In order to the change in time and space of the electric field indexs such as electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process, provide a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils and method.
The technical scheme that the present invention is adopted for achieving the above object is: a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils, comprises probe, main control unit;
Described probe evenly inserts in electro reclamation soil, and is connected with main control unit by wire, exports to main control unit for the analog voltage signal that gathers in electro reclamation soil;
Described main control unit is linking probe, the constant negative terminal of direct supply, electrode respectively, for the analog voltage signal of input is adjusted on the occasion of with carry out N Reference Alignment, calculate electric field intensity value, thus the electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process.
Described probe is iron-nickel alloy probe, and probe length is 5cm ~ 15cm, and diameter is 0.5cm ~ 1.2cm.
Described main control unit comprises polarity of electrode detection module, benchmark negative pressure calibration module, A/D module, field intensity modular converter, control module;
Described polarity of electrode detection module is connecting electrode and control module respectively, positive and negative for detecting electrode polarity, and the 1st digital signal being converted to sign polarity of electrode positive and negative exports to control module;
Described benchmark negative pressure calibration module connects constant negative terminal and the control module of direct supply respectively, and the benchmark negative pressure value that the constant negative terminal for receiving direct supply exports also is converted to the 2nd digital signal and exports to control module;
Described A/D module is linking probe and control module respectively, exports to control module for receiving analog voltage signal that probe exports and converting the 3rd digital signal characterizing soil voltage to;
Described control module is connecting electrode Check up polarity module, benchmark negative pressure calibration module, A/D module and field intensity modular converter respectively, for receiving the 1st digital signal, the 2nd digital signal and the 3rd digital signal, and according to the 1st digital signal and the 2nd digital signal to the 3rd digital signal be adjusted on the occasion of with carry out N Reference Alignment, and export characterize correct after the 4th digital signal of soil voltage to field intensity modular converter;
Described field intensity modular converter link control module, for carrying out calculating be converted to electric field intensity value to the 4th digital signal received and the probe relative space position coordinate preset, electrode separation, benchmark negative pressure value;
Described A/D module adopts A/D678 chip.
Described control module adopts ARM7 microprocessor.
When described 1st digital signal is 1, represent now detect that polarity of electrode is just, the value that control module does not change the 3rd digital signal is positive and negative, the 3rd digital signal be still on the occasion of; When 1st digital signal is 0, represents and now detect that polarity of electrode is negative, the value that control module changes the 3rd digital signal is positive and negative, and the 3rd digital signal takes absolute value.
For an electric field monitoring method for Electrokinetic Remediation of Polluted Soils, comprise the following steps:
A. electrode insertion in contaminated soil, and the position of holding electrode in electro reclamation soil is for being uniformly distributed; Electrode is graphite electrode, and quantity is M × N number of, and wherein M, N are positive integer, for the electro reclamation of contaminated soil; In contaminated soil, inserting probe, and keeping the position of probe in electro reclamation soil for being uniformly distributed;
B. in main control unit, preset probe relative space position coordinate, setting electrode separation, benchmark negative pressure value; Adjustment polarity switch controller arranges the polarity switching interval time;
C. start monitoring device, start to monitor electric field change:
The A/D module converts that analog voltage signal in the electro reclamation soil collected is exported to main control unit inside by probe becomes the 3rd digital signal of sign soil voltage to export to control module; The 1st positive and negative for the sign polarity of electrode detected digital signal is exported to control module by polarity of electrode detection module; The benchmark negative pressure value of the constant negative terminal of the direct supply received is converted to the 2nd digital signal and exports to control module by benchmark negative pressure calibration module; Control module receives the 1st digital signal, the 2nd digital signal and the 3rd digital signal, and according to the 1st digital signal and the 2nd digital signal to the 3rd digital signal be adjusted on the occasion of with carry out N Reference Alignment, export characterize correct after the 4th digital signal of soil voltage to field intensity modular converter; Field intensity modular converter carries out calculating be converted to electric field intensity value to the 4th digital signal received and the probe relative space position coordinate preset, electrode separation, benchmark negative pressure value, thus the electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process.
The present invention has the following advantages and beneficial effect:
1. soil is different from homogeneous surrounding mediums such as water, soil particle and moisture change and all can impact electric field intensity value, instant invention overcomes the impact by complicated soil medium of electric field in the contaminated soil of electro reclamation, achieve the monitoring of the indexs such as electric field intensity under complicated soil ambient condition.
2. monitoring device is by high conductivity probe and the main control unit with Check up polarity, N Reference Alignment, analog-digital conversion function, complete calibration and the conversion of electric signal, realize the real-time monitoring to the contaminated soil electric field intensity of electro reclamation, thus optimization current field condition, improve the electrokinetic remediation efficiency of contaminated soil.
Accompanying drawing explanation
Fig. 1 is monitoring device of the present invention composition schematic diagram;
Fig. 2 is the main control unit composition schematic diagram of monitoring device of the present invention;
Fig. 3 is that schematic diagram laid by the polarity of electrode of oil pollution brown earth electro reclamation and probe;
Fig. 4 is the electric field intensity monitoring result of oil pollution brown earth electro reclamation;
Fig. 5 is that schematic diagram laid by the polarity of electrode of cadmium pollution sand electro reclamation and probe;
Fig. 6 is the electric field intensity monitoring result of cadmium pollution sand electro reclamation.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1: a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils comprises probe 1, main control unit 2; Probe 1 is iron-nickel alloy probe, length is 5cm ~ 15cm, and diameter is 0.5cm ~ 1.2cm, evenly inserts in electro reclamation soil 3, and be connected with main control unit 2 by wire, export to main control unit 2 for the analog voltage signal that gathers in electro reclamation soil 3; Main control unit 2 is linking probe 1, the constant negative terminal of direct supply 4, electrode 6 respectively, for the analog voltage signal of input is adjusted on the occasion of with carry out N Reference Alignment, calculate electric field intensity value, thus the electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process.
Direct supply 4 connects polarity switch controller 5, polarity switch controller 5 connecting electrode 6; The direct supply of direct supply 4 for providing 20V ~ 36V to electrode 6; Polarity switch controller 5 comprises time controller and relay, and the polarity for the time interval controls electrode 6 according to setting switches between positive and negative; Described electrode 6 is graphite electrode, and quantity is M × N number of, and wherein M, N are positive integer, for the electro reclamation of contaminated soil.
As shown in Figure 2: main control unit 2 comprises polarity of electrode detection module 7, benchmark negative pressure calibration module 8, A/D module 9, field intensity modular converter 10, control module 11; Described polarity of electrode detection module 7 is connecting electrode 6 and control module 11 respectively, positive and negative for detecting electrode 6 polarity, and the 1st digital signal being converted to sign electrode 6 polarity positive and negative exports to control module 11; Described benchmark negative pressure calibration module 8 connects constant negative terminal and the control module 11 of direct supply 4 respectively, and the benchmark negative pressure value that the constant negative terminal for receiving direct supply 4 exports also is converted to the 2nd digital signal and exports to control module 11; A/D module 9 is 12 A/D converters, adopts A/D678 chip, respectively linking probe 1 and control module 11, exports to control module 11 for receiving analog voltage signal that probe 1 exports and converting the 3rd digital signal characterizing soil voltage to; Described control module 11 adopts ARM7 microprocessor, connecting electrode Check up polarity module 7, benchmark negative pressure calibration module 8, A/D module 9 and field intensity modular converter 10 respectively, for receiving the 1st digital signal, the 2nd digital signal and the 3rd digital signal, and according to the 1st digital signal and the 2nd digital signal to the 3rd digital signal be adjusted on the occasion of with carry out N Reference Alignment, and export characterize correct after the 4th digital signal of soil voltage to field intensity modular converter 10; Field intensity modular converter 10 link control module 11, for carrying out calculating be converted to electric field intensity value to the 4th digital signal received and the probe 1 relative space position coordinate preset, electrode 6 spacing, benchmark negative pressure value, thus the electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process.
Wherein, when the 1st digital signal is 1, represent and now detect that electrode 6 polarity is for just, the value that control module 11 does not change the 3rd digital signal is positive and negative, the 3rd digital signal be still on the occasion of; When 1st digital signal is 0, represent and now detect that electrode 6 polarity is negative, the value that control module 11 changes the 3rd digital signal is positive and negative, and the 3rd digital signal takes absolute value.
Embodiment 1
The contaminated soil that the present embodiment is repaired is the oil-polluted soils of laboratory configuration, and the soil adopted is brown earth, and the air-dry rear 2mm sieve excessively of Indoor Natural, oil picks up from oil hole, dawn oil recovery factory, Liaohe Oil Field, is mixed with oleaginousness 50g/kg oil-polluted soils.After oil mixes with soil, be divided into 4 process, regulate water percentage to be 5%, 10%, 15% and 25% with deionized water respectively, be respectively charged into (long 30cm × wide 30cm × high 10cm) in soil box.
In contaminated soil, arrange four electrodes 6 according to shown in Fig. 3, electrode 6 material is graphite electrode, diameter 1cm, high 11cm, impressed voltage is 30V, and keeps the polarity of adjacent two electrodes contrary, by adjustment polarity switch controller 5, realize the exchange-column shift of polarity of electrode interval 4h.In contaminated soil, arrange probe 1 according to Fig. 3, probe 1 material is iron-nickel alloy, and probe length is 10cm, and diameter is 1cm.
Concrete operations flow process comprises:
Probe 1 evenly inserts in electro reclamation soil 3, and is connected by the A/D module 9 of wire with main control unit 2 inside; Electrode 6 is connected by the polarity of electrode detection module 7 of wire with main control unit 2 inside; The constant negative terminal of direct supply 4 is connected with the benchmark negative pressure calibration module 8 of main control unit 2 inside by wire.
After having connected, control flow is as follows:
Start monitoring device, in main control unit 2, preset probe relative space position coordinate (as Fig. 5), electrode 6 spacing size is 30cm, and benchmark negative pressure value is 0V, and impressed voltage is 30V, data collection interval is 2h, starts the data acquisition of electric signal.
The A/D module 9 that analog voltage signal in the electro reclamation soil 3 collected is exported to main control unit 2 inside by probe 1 converts the 3rd digital signal characterizing soil voltage to and exports to control module 11; The 1st positive and negative for sign electrode 6 polarity detected digital signal is exported to control module 11 by polarity of electrode detection module 7; The benchmark negative pressure value of the constant negative terminal of the direct supply 4 received is converted to the 2nd digital signal and exports to control module 11 by benchmark negative pressure calibration module 8; Control module 11 receives the 1st digital signal, the 2nd digital signal and the 3rd digital signal, and according to the 1st digital signal and the 2nd digital signal to the 3rd digital signal be adjusted on the occasion of with carry out N Reference Alignment, export characterize correct after the 4th digital signal of soil voltage to field intensity modular converter 10; Field intensity modular converter 10 carries out calculating be converted to electric field intensity value to the 4th digital signal received and the probe 1 relative space position coordinate preset, electrode 6 spacing, benchmark negative pressure value, thus the electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process.
The verification of electric field intensity monitoring result and theoretical value:
Electric field intensity is the core index of electro reclamation.From table 1 and Fig. 4, compared with calculating result with the electric field intensity based on point charge model, can find out, the interdependence effects of soil moisture content to monitor value and theoretical value is larger.Wherein soil moisture content is 25% time, and monitor value and the linear good relationship of theoretical value, slope is approximately 1, and the difference of monitor value and theoretical value is minimum.Therefore, under suitable water percentage condition, monitoring result can react the electric field intensity of electro reclamation soil really.
The test result of table 1 embodiment 1
| Experiment process | Water percentage (%) | Linear fit | R 2 |
| Experiment 1 | 5 | y＝0.1484x+0.1252 | 0.990 |
| Experiment 2 | 10 | y＝0.6592x+0.0511 | 0.992 |
| Experiment 3 | 15 | y＝0.8611x+0.0187 | 0.992 |
| Experiment 4 | 25 | y＝0.9903x-0.0081 | 0.997 |
Embodiment 2
Contaminated soil to be repaired is heavy metal cadmium contaminated soil, and soil is sand, and cadmium content is 10ppm.Be divided into 4 process, regulate water percentage to be 10%, 15%, 20% and 25% with deionized water respectively, be respectively charged into (long 20cm × wide 10cm × high 10cm) in soil box.
In contaminated soil, arrange four electrodes 6 according to shown in Fig. 5, electrode 6 material is graphite electrode, diameter 1cm, high 11cm, and impressed voltage is 20V, and the polarity of electrode does not switch.According to arranging probe 1 shown in Fig. 5 in contaminated soil, probe 1 material is iron-nickel alloy, and probe length is 10cm, and diameter is 1cm.
Concrete operations flow process comprises:
Probe 1 evenly inserts in electro reclamation soil 3, and is connected by the A/D module 9 of wire with main control unit 2 inside; Electrode 6 is connected by the polarity of electrode detection module 7 of wire with main control unit 2 inside; The constant negative terminal of direct supply 4 is connected with the benchmark negative pressure calibration module 8 of main control unit 2 inside by wire.
After having connected, control flow is as follows:
Start monitoring device, in main control unit 2, preset probe relative space position coordinate (as Fig. 5), electrode 6 spacing size is 20cm; Benchmark negative pressure value is 0V, impressed voltage is 20V, and data collection interval is 1h, starts the data acquisition of electric signal.
The A/D module 9 that analog voltage signal in the electro reclamation soil 3 collected is exported to main control unit 2 inside by probe 1 converts the 3rd digital signal characterizing soil voltage to and exports to control module 11; The 1st positive and negative for sign electrode 6 polarity detected digital signal is exported to control module 11 by polarity of electrode detection module 7; The benchmark negative pressure value of the constant negative terminal of the direct supply 4 received is converted to the 2nd digital signal and exports to control module 11 by benchmark negative pressure calibration module 8; Control module 11 receives the 1st digital signal, the 2nd digital signal and the 3rd digital signal, and according to the 1st digital signal and the 2nd digital signal to the 3rd digital signal be adjusted on the occasion of with carry out N Reference Alignment, export characterize correct after the 4th digital signal of soil voltage to field intensity modular converter 10; Field intensity modular converter 10 carries out calculating be converted to electric field intensity value to the 4th digital signal received and the probe 1 relative space position coordinate preset, electrode 6 spacing, benchmark negative pressure value, thus the electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process.
The verification of monitoring result and theoretical value:
From table 2 and Fig. 6, at sand water percentage under the condition being greater than 20%, monitor value and the linear good relationship of theoretical value, slope is approximately 1, and both differences are less.Therefore, under suitable water percentage condition, monitoring result can react the electric field intensity space distribution of electro reclamation soil really.
The test result of table 2 embodiment 2
| Experiment process | Water percentage (%) | Linear fit | R 2 |
| Experiment 1 | 10 | y＝0.0707x+0.1625 | 0.835 |
| Experiment 2 | 15 | y＝0.3902x+0.2771 | 0.972 |
| Experiment 3 | 20 | y＝0.9424x+0.1860 | 0.998 |
| Experiment 4 | 25 | y＝0.9707x+0.0576 | 0.997 |
Above content is in conjunction with concrete preferential case study on implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to this.Without departing from the inventive concept of the premise, also can make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. for an electric field monitoring device for Electrokinetic Remediation of Polluted Soils, it is characterized in that: comprise probe (1), main control unit (2);
Described probe (1) evenly inserts in electro reclamation soil (3), and be connected with main control unit (2) by wire, export to main control unit (2) for the analog voltage signal that gathers in electro reclamation soil (3);
Described main control unit (2) is linking probe (1), the constant negative terminal of direct supply (4), electrode (6) respectively, for the analog voltage signal of input is adjusted on the occasion of with carry out N Reference Alignment, calculate electric field intensity value, thus the electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process.
2. a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils according to claim 1, is characterized in that: described probe (1) is iron-nickel alloy probe, and probe length is 5cm ~ 15cm, and diameter is 0.5cm ~ 1.2cm.
3. a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils according to claim 1, is characterized in that: described main control unit (2) comprises polarity of electrode detection module (7), benchmark negative pressure calibration module (8), A/D module (9), field intensity modular converter (10), control module (11);
Described polarity of electrode detection module (7) is connecting electrode (6) and control module (11) respectively, positive and negative for detecting electrode (6) polarity, and the 1st digital signal being converted to sign electrode (6) polarity positive and negative exports to control module (11);
Described benchmark negative pressure calibration module (8) connects constant negative terminal and the control module (11) of direct supply (4) respectively, and the benchmark negative pressure value that the constant negative terminal for receiving direct supply (4) exports also is converted to the 2nd digital signal and exports to control module (11);
Described A/D module (9) is linking probe (1) and control module (11) respectively, for receiving analog voltage signal that probe (1) exports and the 3rd digital signal converting sign soil voltage to exports to control module (11);
Described control module (11) is connecting electrode Check up polarity module (7), benchmark negative pressure calibration module (8), A/D module (9) and field intensity modular converter (10) respectively, for receiving the 1st digital signal, the 2nd digital signal and the 3rd digital signal, and according to the 1st digital signal and the 2nd digital signal to the 3rd digital signal be adjusted on the occasion of with carry out N Reference Alignment, and export characterize correct after the 4th digital signal of soil voltage to field intensity modular converter (10);
Described field intensity modular converter (10) link control module (11), for carrying out calculating be converted to electric field intensity value to the 4th digital signal received and probe (1) the relative space position coordinate preset, electrode (6) spacing, benchmark negative pressure value.
4. a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils according to claim 3, is characterized in that: described A/D module (9) adopts A/D678 chip.
5. a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils according to claim 3, is characterized in that: described control module (11) adopts ARM7 microprocessor.
6. a kind of electric field monitoring device for Electrokinetic Remediation of Polluted Soils according to claim 3, it is characterized in that: when described 1st digital signal is 1, represent and now detect that electrode (6) polarity is just, the value that control module (11) does not change the 3rd digital signal is positive and negative, the 3rd digital signal be still on the occasion of; When 1st digital signal is 0, represents and now detect that electrode (6) polarity is negative, the value that control module (11) changes the 3rd digital signal is positive and negative, and the 3rd digital signal takes absolute value.
7., for an electric field monitoring method for Electrokinetic Remediation of Polluted Soils, it is characterized in that comprising the following steps:
A. electrode insertion (6) in contaminated soil, and the position of holding electrode (6) in electro reclamation soil (3) is for being uniformly distributed; Electrode (6) is graphite electrode, and quantity is M × N number of, and wherein M, N are positive integer, for the electro reclamation of contaminated soil; In contaminated soil, inserting probe (1), and keeping the position of probe (1) in electro reclamation soil (3) for being uniformly distributed;
B. in main control unit (2), preset probe (1) relative space position coordinate, setting electrode (6) spacing, benchmark negative pressure value; Adjustment polarity switch controller (5) arranges the polarity switching interval time;
C. start monitoring device, start to monitor electric field change:
Analog voltage signal in the electro reclamation soil (3) collected is exported to the inner A/D module (9) of main control unit (2) and is converted the 3rd digital signal characterizing soil voltage to and export to control module (11) by probe (1); The 1st positive and negative for sign electrode (6) polarity detected digital signal is exported to control module (11) by polarity of electrode detection module (7); The benchmark negative pressure value of the constant negative terminal of the direct supply received (4) is converted to the 2nd digital signal and exports to control module (11) by benchmark negative pressure calibration module (8); Control module (11) receives the 1st digital signal, the 2nd digital signal and the 3rd digital signal, and according to the 1st digital signal and the 2nd digital signal to the 3rd digital signal be adjusted on the occasion of with carry out N Reference Alignment, export characterize correct after the 4th digital signal of soil voltage to field intensity modular converter (10); Field intensity modular converter (10) carries out calculating be converted to electric field intensity value to the 4th digital signal received and probe (1) the relative space position coordinate preset, electrode (6) spacing, benchmark negative pressure value, thus the electric field intensity in Real-Time Monitoring Electrokinetic Remediation of Polluted Soils process.
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| CN106734174A (en) * | 2017-01-17 | 2017-05-31 | 中国地质科学院矿产资源研究所 | Electric restoration contaminated soil display system |
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