CN104550217A - Controlling device and method of polluted soil electrokinetic remediation field intensity based on current compensation - Google Patents
Controlling device and method of polluted soil electrokinetic remediation field intensity based on current compensation Download PDFInfo
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Abstract
The invention relates to a controlling device and a controlling method of polluted soil electrokinetic remediation field intensity based on current compensation, and is realized in such a way that main electrode matrixes and current compensation matrixes are distributed in a staggered way at equal spaces. The main electrode matrixes are distributed in an equal space grid of M*N (M is more than or equal to 2, and N is more than or equal to 2); through periodic polarity switching, the full coverage of the electric field intensity of electrokinetic remediation areas is realized, and the attenuation of the electric field intensity can be caused due to electrokinesis; the array of the compensation electrode is a grid matrix of (M-1)*(N-1), and the compensation electrode and the matrix electrode matrixes are distributed in a staggered way at equal spaces; when the field intensity attenuation rate of a monitoring area in the main electrode matrix is more than or equal to 20 percent, the compensation electrode corresponding to the main electrode in the area is started, and the polarities of the compensation electrode and the main electrode are opposite; the electric field intensity is controlled by means of current compensation. According to the controlling device and the controlling method, the problem of the attenuation of the field intensity in the electrokinetic remediation process is solved, and the integral remediation efficiency of the polluted soil is improved.
Description
Technical field
The present invention relates to Electrokinetic Remediation of Polluted Soils technical field, is the Electrokinetic Remediation of Polluted Soils field intensity regulation device based on current compensation and method specifically.
Background technology
Electric repair method contaminated soil is current a kind of emerging technology.In existing electro reclamation process, electrode is inserted in contaminated soil, forms electrode matrix, apply faint direct current and form electric field.Under the synergy of electrochemical reaction and electrokinesis, effectively can remove the pollutant in soil.
Utilize M × N number of matrix electrodes isometric net arrangement in early-stage Study process, switched by the polarity of periodic anode and cathode, form asymmetric electric field, achieve all standing (CN 102294350B) in the effective district of electric field.And electric-field intensity is as the core index of Electrokinetic Remediation of Polluted Soils technical efficiency, directly affect the removal efficiency (Liet al., 2014) of pollutant in soil.But in Electrokinetic Remediation of Polluted Soils process, the electrokinesises such as the electrolysis of the soil water, the electromigration of ion, all cause soil electric-field intensity to change, even constantly decay, electrokinetic remediation efficiency thus decrease.In addition, the inhomogeneity of soil media, and the difference of Different Soil physicochemical property, all can cause the decay of electric-field intensity.
Mode as how current compensation realizes the regulation and control of electric-field intensity, makes up the defect of electric-field intensity decay in electro reclamation process, is significant to the high efficiency maintaining Electrokinetic Remediation of Polluted Soils efficiency.
Summary of the invention
For realizing the field intensity regulation and control in electro reclamation process, solving the problem of electric-field intensity decay in electro reclamation process, maintaining the high efficiency of Electrokinetic Remediation of Polluted Soils efficiency, provide the Electrokinetic Remediation of Polluted Soils field intensity regulation device based on current compensation and method.
The technical scheme that the present invention is adopted for achieving the above object is: a kind of Electrokinetic Remediation of Polluted Soils field intensity regulation device based on current compensation, comprising:
Main electrode matrix, comprise multiple main electrodes of latticed laying, by the opened/closed of time controller control relay, and then control each polarity of electrode, keep the main electrode polarity of same diagonal identical, the main electrode polarity in adjacent diagonal line direction is different;
Dc source, by relay and time controller, connects each electrode in main electrode matrix, for main electrode matrix power;
Very first time controller TC1, by being connected of the first relay K A1 and the second relay K A2 and dc source, main electrodes all on the diagonal of interval in output and main electrode matrix is connected, for controlling the opened/closed of the first relay K A1 and the second relay K A2, and then control electrode polarity;
Second time controller TC2, by being connected of the 3rd relay K A3 and the 4th relay K A4 and dc source, output connects the main electrode in main electrode matrix in the diagonal of other interval, for controlling the opened/closed of the 3rd relay K A3 and the 4th relay K A4, and then control electrode polarity;
Current compensation electrode matrix, comprises multiple compensating electrode, and each compensating electrode is laid in the central spot of the minimum unit be made up of adjacent four electrodes in main electrode matrix;
Offset supply, connects each compensating electrode in current compensation electrode matrix, for powering to current compensation electrode matrix by the 3rd time controller TC3;
3rd time controller TC3, by being connected of the 5th relay K A5 and the 6th relay K A6 and offset supply, each Electrode connection of output and current compensation matrix, for controlling the opened/closed of the 5th relay K A5 and the 6th relay K A6, and then the polarity of control and compensation electrode;
Field intensity monitor is by laying field intensity monitoring probe in main electrode and compensating electrode centre position, and the change of monitoring electric-field intensity attenuation rate, judges whether that startup the 3rd time controller TC3 carries out current compensation.
Described main electrode matrix adopts isometric net to lay.
The voltage range of described dc source is 20V ~ 36V.
The voltage range of described offset supply is 20V ~ 36V.
Described field intensity detector monitors the electric-field intensity change of described monitoring point, when electric-field intensity attenuation rate >=20%, starting the 3rd time controller TC3, is that current compensation electrode matrix is powered by offset supply, realize current compensation, strengthen the electric-field intensity of appointed area.
Based on an Electrokinetic Remediation of Polluted Soils field intensity regulate and control method for current compensation, comprise the following steps:
Under main electrode matrix polarity switch mode, by very first time controller TC1 control relay, make the main electrode polarity in a diagonal identical; By the second time controller TC2 control relay, keep the main electrode polarity in another diagonal identical; And keep adjacent diagonal line main electrode polarity contrary;
It is identical with the opened/closed time of the second time controller TC2 that very first time controller TC1 is set, make the first relay K A1 and the 4th relay K A4 closing time synchronous, second relay K A2 and the 3rd relay K A3 closing time synchronous, first relay K A1, the 4th relay K A4 and the second relay K A2, the 3rd relay K A3 closing time are asynchronous, and then make the main electrode polarity in the diagonal of interval different;
Under compensating electrode pattern, the opened/closed time arranging the 3rd time controller TC3 is identical with very first time controller TC1, the second time controller TC2, keep the 5th relay K A5 asynchronous with the relay closes time of corresponding compensatory zone, 6th relay K A6 and the relay closes time synchronized of corresponding compensatory zone, make compensating electrode contrary with the polarity of corresponding main electrode;
When monitoring section electric-field intensity attenuation rate >=20%, start compensating electrode pattern, by the 3rd time controller TC3, current compensation electrode matrix is made to connect offset supply, keep the compensating electrode on a diagonal identical/different from the main electrode polarity on this diagonal, and different/identical from the compensating electrode polarity on another diagonal.
The present invention has the following advantages and beneficial effect:
1. the offset current formed between compensating electrode with corresponding main electrode, can solve the attenuation problem of local electric field strength, thus improves the remediation efficiency of electro reclamation entirety.
2. main electrode matrix and compensating electrode matrix are equidistantly laid staggeredly mode, have ensured the current compensation to arbitrary region, thus the field intensity size of regulation and control electro reclamation overall region.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention composition schematic diagram; Wherein, 1 is main electrode matrix, and 2 is dc source, and 3 is very first time controller TC1,4 is the second time controller TC2, and 5 is current compensation electrode matrix, and 6 is offset supply, 7 is the 3rd time controller TC3, and 8 is field intensity monitor, and 9 is main electrode and compensating electrode centre position;
Fig. 2 is the electrode arranging structure connection diagram of 2 × 2 main electrode matrixes and current compensation electrode;
Fig. 3 is 2 × 2 main electrode matrix polarity switch mode and current compensation schematic diagrames;
Fig. 4 is 2 × 2 main electrode matrixes and compensating electrode matrix polarity switching flow figure.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, 2, apparatus of the present invention are by the equidistant main electrode matrix and current compensation electrode matrix laid of misplacing, according to the attenuation rate of field intensity, the compensating electrode corresponding with main electrode is powered, and keep compensatory zone two polarity of electrode contrary, by the mode of current compensation, regulate and control this region electric field intensity inside high.Described main electrode matrix adopts the isometric net of M × N (M >=2, N >=2) to lay, and by DC power supply, voltage range is 20V ~ 36V, the polarity switching of main electrode is completed by very first time controller TC1 and the second time controller TC2, comprise the following steps: for 2 × 2 electrode matrix unit, it is identical with the opened/closed time of the second time controller TC2 that very first time controller TC1 is set, make the first relay K A1 and the 4th relay K A4 closing time synchronous, second relay K A2 and the 3rd relay K A3 closing time synchronous, first relay K A1, 4th relay K A4 and the second relay K A2, 3rd relay K A3 closing time is asynchronous, and then control No. 1, No. 4 electrodes and No. 2, the polarity of No. 3 electrodes is contrary.
Described current compensation electrode matrix adopts (M-1) × (N-1) isometric net to lay, and with main electrode matrix Heterogeneous Permutation, offset supply voltage range is 20V ~ 36V, by regulation and control offset supply output voltage, thus regulation and control offset current size; The polarity switching of current compensation electrode matrix is completed by the 3rd time controller TC3, comprises the following steps: for 2 × 2 matrix units of main electrode matrix, if No. 5 electrodes are current compensation electrode.To compensate the electric-field intensity in No. 1 electrode zone, the opened/closed time then arranging the 3rd time controller TC3 is identical with very first time controller TC1, the second time controller TC2, make the 5th relay K A5 synchronous with the 4th relay K A4 closing time, 6th relay K A6 is synchronous with the 3rd relay K A3 closing time, and the 5th relay K A5, the 4th relay K A4 and the 6th relay K A6, the 3rd relay K A3 closing time are asynchronous, and then it is contrary with the polarity of No. 1 electrode to control No. 5 current compensation electrodes.
In electro reclamation process, soil moisture content maintains 25% ± 3%.Under this condition, field strength attenuation rate is that field intensity monitor fixed point monitoring obtains.When field strength attenuation rate >=20%, field intensity monitor starts compensating electrode matrix power, by the 3rd time controller TC3, makes current compensation electrode matrix connect offset supply, provides current compensation, the electric-field intensity of regulation and control appointed area.
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 Shenyang, Liaohe Oil Field oil recovery factory, is mixed with oil content 40g/kg oil-polluted soils.After being mixed with oil-polluted soils, natural air drying places 7 days, after oil mixes with soil, with pure water, soil moisture content is adjusted to 25%, is encased in soil box, the long 24cm of soil box, wide 24cm, high 10cm.And soil moisture content maintains 25% ± 3% in electro reclamation process.
Arrange five root electrodes in contaminated soil, respectively called after 1,2,3,4, No. 5 electrodes, wherein, 1,2,3, No. 4 is main electrode, and No. 5 electrodes are current compensation electrode.Electrode material is graphite electrode, diameter 1cm, high 11cm, and wherein 1,2,3, No. 4 interelectrode distance is 24cm, and No. 5 electrodes, in the centerline points of 1,2,3, No. 4 electrode, arrange electrode see Fig. 2.Main electrode matrix direct current supply voltage is 24V, and polarity switching time is 6h, and compensating electrode direct current supply voltage range is 24V.Repair time is 60d.Monitored area is divided into four regions according to center, and respectively according to main electrode numbering called after monitoring section 1, monitoring section 2, monitoring section 3, monitoring section 4, see Fig. 3.
Reach by regulation time controller parameter control relay adhesive order the object that electrode switches opposed polarity, idiographic flow as shown in Figure 4, comprising:
Step one, setup times controller parameter.Keep very first time controller TC1 identical with the opened/closed time of the second time controller TC2, make the first relay K A1 and the 4th relay K A4 closing time synchronous, synchronously, the first relay K A1, the 4th relay K A4 and the second relay K A2, the 3rd relay K A3 closing time are asynchronous for second relay K A2 and the 3rd relay K A3 closing time.
Step 2, under main electrode matrix polarity switch mode, start control system, when the first relay K A1 and the 4th relay K A4 is closed, the second relay K A2 and the 3rd relay K A3 opens, No. 1 and No. 4 electrodes are negative pole, No. 2 and No. 3 electrodes are positive pole; When the first relay K A1 and the 4th relay K A4 open, the second relay K A2 and the 3rd relay K A3 close time, No. 1 and No. 4 electrodes are positive pole, No. 2 and No. 3 electrodes are negative pole;
Step 3, when monitoring section electric-field intensity attenuation rate >=20%, start compensating electrode pattern, it is identical with the opened/closed time of very first time controller TC1, the second time controller TC2 that the 3rd time controller TC3 is set.To monitor 1st district, keep the 5th relay K A5 and the first relay K A1, the 4th relay K A4 closing time synchronous, 6th relay K A6 is synchronous with the second relay K A2, the 3rd relay K A3 closing time, 5th relay K A5 and the 6th relay K A6 closing time asynchronous, namely when the 5th relay K A5, the first relay K A1 and the 4th relay K A4 close, when 6th relay K A6, the second relay K A2 and the 3rd relay K A3 open, No. 1 and No. 4 electrodes are negative pole, and No. 2, No. 3, No. 5 electrodes are positive pole; When the 5th relay K A5, the first relay K A1 and the 4th relay K A4 open, when the 6th relay K A6, the second relay K A2 and the 3rd relay K A3 close, No. 1 and No. 4 electrodes are positive pole, and No. 2, No. 3, No. 5 electrodes are negative pole.
By the current compensation between compensating electrode and main electrode, regulate and control local electric field strength in electro reclamation process, maintained the high efficiency of electro reclamation, improve overall remediation efficiency.
Reparation the results are shown in subordinate list 1.
Table 1
| Group | Process | Initial oil content (%) | Remediation efficiency (%) | Processing time (my god) |
| Control group | Nothing | 4％ | 3.7％ | 60 |
| Experimental group 1 | Electro reclamation | 4％ | 42.5％ | 60 |
| Experimental group 2 | Current compensation electro reclamation | 4％ | 57.9％ | 60 |
Embodiment 2
Difference from Example 1 is:
The contaminated soil repaired is pyrene contaminated soil, and pyrene content is 150ppm.The long 10cm of soil chamber, wide 10cm, high 5cm.Electrode adopts graphite electrode, and electrode diameter is 0.5cm, high 6cm.Main electrode matrix direct current supply voltage is 20V, and compensating electrode direct current supply voltage is 20V.Polarity switching time is 4h, and repair time is 30d.In electro reclamation process, soil moisture content maintains 25% ± 3%.
After having connected, start main electrode Inverse problem pattern, when monitoring section electric-field intensity attenuation rate >=20%, start compensating electrode pattern, make the decay main electrode polarity of monitoring section of No. 5 polarities of electrode and electric-field intensity keep contrary.By the current compensation between compensating electrode and main electrode, regulate and control local electric field strength in electro reclamation process, maintained the high efficiency of electro reclamation, improve overall remediation efficiency.
Reparation the results are shown in subordinate list 2.
Table 2
| Group | Process | Initial pyrene content (ppm) | Remediation efficiency (%) | Processing time (my god) |
| Control group | Nothing | 150 | 5.2％ | 30 |
| Experimental group 1 | Electro reclamation | 150 | 58.4％ | 30 |
| Experimental group 2 | Current compensation electro reclamation | 150 | 82.7％ | 30 |
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 (6)
1., based on an Electrokinetic Remediation of Polluted Soils field intensity regulation device for current compensation, it is characterized in that, comprising:
Main electrode matrix, comprise multiple main electrodes of latticed laying, by the opened/closed of time controller control relay, and then control each polarity of electrode, keep the main electrode polarity of same diagonal identical, the main electrode polarity in adjacent diagonal line direction is different;
Dc source, by relay and time controller, connects each electrode in main electrode matrix, for main electrode matrix power;
Very first time controller TC1, by being connected of the first relay K A1 and the second relay K A2 and dc source, main electrodes all on the diagonal of interval in output and main electrode matrix is connected, for controlling the opened/closed of the first relay K A1 and the second relay K A2, and then control electrode polarity;
Second time controller TC2, by being connected of the 3rd relay K A3 and the 4th relay K A4 and dc source, output connects the main electrode in main electrode matrix in the diagonal of other interval, for controlling the opened/closed of the 3rd relay K A3 and the 4th relay K A4, and then control electrode polarity;
Current compensation electrode matrix, comprises multiple compensating electrode, and each compensating electrode is laid in the central spot of the minimum unit be made up of adjacent four electrodes in main electrode matrix;
Offset supply, connects each compensating electrode in current compensation electrode matrix, for powering to current compensation electrode matrix by the 3rd time controller TC3;
3rd time controller TC3, by being connected of the 5th relay K A5 and the 6th relay K A6 and offset supply, each Electrode connection of output and current compensation matrix, for controlling the opened/closed of the 5th relay K A5 and the 6th relay K A6, and then the polarity of control and compensation electrode;
Field intensity monitor is by laying field intensity monitoring probe in main electrode and compensating electrode centre position, and the change of monitoring electric-field intensity attenuation rate, judges whether that startup the 3rd time controller TC3 carries out current compensation.
2. as described in claim 1 based on the Electrokinetic Remediation of Polluted Soils field intensity regulation device of current compensation, it is characterized in that: described main electrode matrix adopts isometric net to lay.
3., as described in claim 1 based on the Electrokinetic Remediation of Polluted Soils field intensity regulation device of current compensation, it is characterized in that: the voltage range of described dc source is 20V ~ 36V.
4., as described in claim 1 based on the Electrokinetic Remediation of Polluted Soils field intensity regulation device of current compensation, it is characterized in that: the voltage range of described offset supply is 20V ~ 36V.
5. as described in claim 1 based on the Electrokinetic Remediation of Polluted Soils field intensity regulation device of current compensation, it is characterized in that: described field intensity detector monitors the electric-field intensity change of described monitoring point, when electric-field intensity attenuation rate >=20%, start the 3rd time controller TC3, be that current compensation electrode matrix is powered by offset supply, realize current compensation, strengthen the electric-field intensity of appointed area.
6., based on an Electrokinetic Remediation of Polluted Soils field intensity regulate and control method for current compensation, it is characterized in that, comprise the following steps:
Under main electrode matrix polarity switch mode, by very first time controller TC1 control relay, make the main electrode polarity in a diagonal identical; By the second time controller TC2 control relay, keep the main electrode polarity in another diagonal identical; And keep adjacent diagonal line main electrode polarity contrary;
It is identical with the opened/closed time of the second time controller TC2 that very first time controller TC1 is set, make the first relay K A1 and the 4th relay K A4 closing time synchronous, second relay K A2 and the 3rd relay K A3 closing time synchronous, first relay K A1, the 4th relay K A4 and the second relay K A2, the 3rd relay K A3 closing time are asynchronous, and then make the main electrode polarity in the diagonal of interval different;
Under compensating electrode pattern, the opened/closed time arranging the 3rd time controller TC3 is identical with very first time controller TC1, the second time controller TC2, keep the 5th relay K A5 asynchronous with the relay closes time of corresponding compensatory zone, 6th relay K A6 and the relay closes time synchronized of corresponding compensatory zone, make compensating electrode contrary with the polarity of corresponding main electrode;
When monitoring section electric-field intensity attenuation rate >=20%, start compensating electrode pattern, by the 3rd time controller TC3, current compensation electrode matrix is made to connect offset supply, keep the compensating electrode on a diagonal identical/different from the main electrode polarity on this diagonal, and different/identical from the compensating electrode polarity on another diagonal.
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