CN212733552U - Device for light energy-vertical electric remediation of heavy metal contaminated soil - Google Patents
Device for light energy-vertical electric remediation of heavy metal contaminated soil Download PDFInfo
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- CN212733552U CN212733552U CN202021407826.7U CN202021407826U CN212733552U CN 212733552 U CN212733552 U CN 212733552U CN 202021407826 U CN202021407826 U CN 202021407826U CN 212733552 U CN212733552 U CN 212733552U
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Abstract
The utility model discloses a light energy-vertical electric heavy metal contaminated soil remediation device, which comprises a remediation groove, a medicament storage tank, a medicament recovery tank, a medicament pump and a direct current power supply; the repair tank comprises a tank body extending along the vertical direction, the tank body is provided with an inner cavity, the top of the inner cavity is provided with a cathode plate, and the bottom of the inner cavity is provided with an anode plate; a liquid inlet is arranged at the upper end of the tank body, a liquid outlet is arranged at the lower end of the tank body, and a feed inlet is arranged at the top of the tank body; the inlet of the medicament pump is communicated with a medicament storage tank, and the outlet of the medicament pump is communicated with the liquid inlet; the liquid outlet is communicated with the medicament recovery tank through a liquid discharge pipe; the cathode plate is connected to the negative pole of the direct current power supply, and the anode plate is connected to the positive pole of the direct current power supply. Utilize this application can restore soil effectively to retrieve the medicament, reduce the residual amount of medicament in soil.
Description
Technical Field
The utility model relates to a device of light energy-perpendicular electronic restoration heavy metal contaminated soil belongs to heavy metal soil and restores environmental protection technical field.
Background
With the rapid development of the industries such As the heavy industry and agriculture in China, the heavy metal pollution of the soil brought in the development process gradually exceeds the self-cleaning capacity of the soil, and the national soil pollution condition survey bulletin shows that the standard exceeding rates of point positions of 8 inorganic pollutants such As Cd, Hg, As, Cu, Pb, Cr, Zn, Ni and the like are respectively 7.0%, 1.6%, 2.7%, 2.1%, 1.5%, 1.1%, 0.9% and 4.8%, and the heavy metal pollution of the soil is undoubtedly a part to be urgently solved in the problem of environmental pollution. Because the heavy metal contaminated soil has the characteristics of wide range, concealment, long-term property, accumulation property, regionality, irreversibility, difficulty in control and the like, the heavy metal contaminated soil not only becomes a concern of human beings on the safety and self health of crops, but also becomes a research difficulty at home and abroad. The electric restoration technology is a new soil restoration technology, has good effects on restoring soil polluted by heavy metals, organic pollution and nuclear waste, and is also applied to sludge dewatering of sewage plants, and meanwhile, the technology has low operation cost, is quick in restoration, can carry out in-situ restoration, and has remarkable effect on low-permeability soil.
At present, the electrokinetic remediation of heavy metal contaminated soil has a plurality of insufficient places in application: (1) the method does not consider adopting different agents which do not cause secondary pollution to the environment according to different soil properties so as to improve the mobility of heavy metals in the soil and further improve the remediation efficiency; (2) the problem of large energy consumption of repair equipment in a long-time electric repair process is not considered; (3) the problem of reduction of the remediation efficiency caused by the change of physicochemical properties such as the water content and the conductivity of the soil in the long-time electric remediation process is not considered. Therefore, the research and development of a simple, economical and efficient electrokinetic remediation technology for the heavy metal contaminated soil is needed.
SUMMERY OF THE UTILITY MODEL
In view of the existing problems, the utility model firstly provides a device for the optical energy-vertical electro-remediation of heavy metal contaminated soil, which comprises a remediation tank, a medicament storage tank, a medicament recovery tank, a medicament pump and a direct current power supply;
the repair tank comprises a tank body extending along the vertical direction, the tank body is provided with an inner cavity, the top of the inner cavity is provided with a cathode plate, and the bottom of the inner cavity is provided with an anode plate; a liquid inlet is arranged at the upper end of the tank body, a liquid outlet is arranged at the lower end of the tank body, and a feed inlet is arranged at the top of the tank body; the inlet of the medicament pump is communicated with a medicament storage tank, and the outlet of the medicament pump is communicated with the liquid inlet; the liquid outlet is communicated with the medicament recovery tank through a liquid discharge pipe;
the cathode plate is connected to the negative pole of the direct current power supply, and the anode plate is connected to the positive pole of the direct current power supply.
This application is at the during operation, and the medicament enters into in the restoration jar by medicament storage jar, then returns in the medicament recovery jar through the liquid outlet. In this application, set up the negative plate in the upper end of restoreing the jar, the positive plate setting is in the lower extreme of restoreing the jar, and the heavy metal ion in the soil of treating to restore under the effect of electromigration, gravity and medicament is peeled off out, enters into the medicament to return to in the medicament recovery jar along with the medicament, retrieve, avoid secondary pollution, also can carry out the recovery processing concentrated to the medicament that enriches the heavy metal simultaneously.
Through the vertical arrangement of the medicament supply and recovery device and the groove body and the arrangement of the cathode and the anode on the electrode, the contact time of the medicament and the heavy metal polluted soil is increased, and compared with the traditional electric restoration method of a transverse electric field, the mobility of heavy metal ions is increased by 15-30%; by the aid of the agent supply and recovery device, at least 95 wt% of the agent rich in heavy metals can be discharged from the soil and recovered, the residual amount of the agent in the soil is not more than 5 wt%, and secondary pollution of pollutants is reduced.
Specifically, the direct current power supply is a solar power supply device which comprises a solar power generation panel, a storage battery connected to the solar power generation panel, and a voltage regulator connected to the storage battery, wherein the cathode plate is connected to the negative output end of the voltage regulator, and the anode plate is connected to the positive output end of the voltage regulator. The solar power supply device can reduce the consumption of other power supplies, saves the energy consumption for soil remediation, saves the remediation cost by 60 percent compared with the traditional electric remediation, and effectively reduces the soil remediation cost.
To facilitate monitoring of the flow rate of the medicament, a flow meter is mounted on the discharge pipe and the supply of the medicament is controlled according to the flow rate.
Specifically, the anode plate and the cathode plate are both in a plate shape extending along the horizontal direction, and the area of the anode plate is 85-95% of the cross sectional area of the inner cavity of the tank body in the horizontal direction; the area of the cathode plate is 85-95% of the cross section area of the inner cavity of the tank body. Compared with the traditional rod-shaped electrode, the effective electric field ratio in the repair groove can reach more than 80%, and the effective electric field ratio is improved by about 25%.
Furthermore, in the vertical direction, the anode plate and the cathode plate are opposite up and down and have the same area, so that the electric field intensity in the repair tank is uniform and upward, the boundary effect is reduced, and the uniform flow of the medicament in the repair tank is promoted.
Secondly, the application also provides a method for the light energy-vertical electrokinetic remediation of the heavy metal contaminated soil, which is carried out by adopting any one of the devices for the light energy-vertical electrokinetic remediation of the heavy metal contaminated soil, and comprises the following steps:
the soil to be repaired is filled into the inner cavity of the repairing tank, the medicament in the medicament storage tank enters the inner cavity of the repairing tank through the medicament pump, and heavy metal ions migrate to the anode plate under the action of an electric field formed between the anode plate and the cathode plate and enter the medicament recovery tank along with the medicament; when the heavy metal ions in the soil to be repaired are reduced to a set value, the soil becomes the repaired soil, and the repaired soil is moved out of the repairing tank.
Specifically, the distance between the positive and negative electrode plates was 1m, and the voltage gradient was 1V/cm.
For Hg contaminated soil, 0.1mol/L KI solution is adopted As a medicament, and for Cd, As, Cu, Pb, Cr, Zn and Ni contaminated soil, 0.01mol/L ethylene diamine tetraacetic acid solution or 0.2mol/L citric acid solution is adopted As a medicament. The above-mentioned medicines are all aqueous solutions.
When the KI solution is used As a medicament to repair Hg-polluted soil, the repair time is 600-750 hours, and when the EDTA solution or the citric acid solution is used to repair Cd, As, Cu, Pb, Cr, Zn and Ni-polluted soil, the repair time is 240-360 hours.
When the method is used for removing heavy metal ions in soil to be repaired, the medicament enters the repairing tank from the upper end, then flows downwards and returns to the medicament recovery tank through the liquid outlet. In the method, the cathode plate is arranged at the upper end of the repair tank, the anode plate is arranged at the lower end of the repair tank, heavy metal ions in the soil to be repaired are stripped under the action of electroosmotic flow, gravity and a medicament, enter the medicament and return to the medicament recovery tank along with the medicament for recovery, so that secondary pollution is avoided, and meanwhile, the medicament enriched with heavy metals can be recovered in a centralized manner.
In the method, specific medicaments are added aiming at different heavy metal ions in the polluted soil, so that the migration of the heavy metal ions can be improved. Heavy metal ions are removed from the soil under the action of gravity along with the medicament after being desorbed from the surface of the soil under the action of electromigration and the medicament.
By utilizing the method, the soil polluted by 8 heavy metals such As low-concentration As, Cd, Pb, Cr, Cu, Ni, Zn, Hg and the like can be repaired to reach the three-level standard of the soil environmental quality standard. The medicament rich in the above 8 heavy metal ions is recovered, so that on one hand, secondary pollution can be prevented, and on the other hand, concentrated recovery treatment can be carried out on the medicament rich in the heavy metal ions.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
First, the following description will be made of an apparatus for light energy-vertical electrokinetic remediation of heavy metal contaminated soil.
Referring to fig. 1, the device for light energy-vertical electro-remediation of heavy metal contaminated soil comprises a remediation tank 8, a drug storage tank 13, a drug recovery tank 15, a drug pump 12 and a dc power supply.
The repair tank 8 comprises a tank body 81 extending in the vertical direction, the tank body 81 is provided with an inner cavity 82, the top of the inner cavity is provided with a cathode plate 7, and the bottom of the inner cavity is provided with an anode plate 9; be provided with inlet 10 in the upper end of this jar of body, be provided with liquid outlet 11 at the lower extreme of this jar of body, the top of this jar of body is provided with feed inlet 83, and this feed inlet is arranged in filling the inner chamber of restoreing the jar with waiting to restore soil.
The inlet of the drug pump 12 is connected to the drug storage tank 13, the outlet of the drug pump 12 is connected to the fluid inlet 10 via a fluid inlet pipe 16, and a first adjusting valve 17 is installed on the fluid inlet pipe 16. The liquid outlet 11 is communicated with a drug recovery tank 15 through a liquid discharge pipe 18. A flow meter 14 and a second regulating valve 19 are mounted on the drain pipe 18.
The cathode plate is connected to the negative pole of the direct current power supply, and the anode plate is connected to the positive pole of the direct current power supply.
In the embodiment, the direct current power supply is a solar power supply device which comprises a solar power generation panel 3, a storage battery 4 connected to the solar power generation panel, a voltage regulator 5 connected to the storage battery, and a universal meter 6 connected to the voltage regulator 5, wherein the cathode plate 7 is connected to the negative output end of the voltage regulator, and the anode plate 9 is connected to the positive output end of the voltage regulator.
In the embodiment, the anode plate and the cathode plate are both in a plate shape extending along the horizontal direction, and the area of the anode plate is 90% of the cross-sectional area of the inner cavity of the tank body in the horizontal direction; the area of the cathode plate is 90% of the cross-sectional area of the inner cavity of the tank body. In the vertical direction, the anode plate and the cathode plate are opposite up and down and have the same area.
It is understood that in other embodiments, the anode plate and the anode plate may each be 85%, 88%, 92%, or 95% of the cross-sectional area of the interior cavity of the can.
The following description is provided for a method for light energy-vertical electrokinetic remediation of heavy metal contaminated soil, which is performed by using the device for light energy-vertical electrokinetic remediation of heavy metal contaminated soil, and comprises the following steps:
the method comprises the following steps:
the soil to be repaired is filled into the inner cavity of the repairing tank, the medicament in the medicament storage tank enters the inner cavity of the repairing tank through the medicament pump, and heavy metal ions migrate to the anode plate under the action of an electric field formed between the anode plate and the cathode plate and enter the medicament recovery tank along with the medicament; when the heavy metal ions in the soil to be repaired are reduced to a set value, the soil becomes the repaired soil, and the repaired soil is moved out of the repairing tank. The distance between the positive plate and the negative plate is 1 m.
Example 1
The method for carrying out the restoration test on the Cu and Pb polluted paddy soil comprises the following specific steps:
(1) and (3) placing the Cu and Pb polluted soil serving as the soil to be repaired in an inner cavity of a repairing tank, wherein the repairing time is 15 days, and the electric energy generated by the solar cell panel is stored in the storage battery and the voltage gradient is set to be 1V/cm through the voltage regulator.
(2) Splendid attire 0.2mol/L citric acid solution is as the medicament in the medicament storage jar, pours citric acid solution into the soil that waits to restore through the medicament pump, waits citric acid and the soil intensive mixing that waits to restore after, opens second governing valve 19 to come real-time supervision soil in through the flowmeter whether have heavy metal to deposit in order to hinder the medicament and flow.
(3) And after the citric acid is fully contacted with the soil to be repaired, the power supply is turned on, and the electric repair is carried out for 15 days. And after the restoration time is finished, closing the medicament pump, and taking out the soil after the medicament stops flowing.
After the polluted soil is repaired, the contents of heavy metals Cu and Pb are shown in Table 1:
TABLE 1 remediation Effect of Cu and Pb contaminated Rice field soil
Example 2:
the method for repairing the Ni and Zn wheat field contaminated soil comprises the following specific steps:
(1) and (3) putting the Ni and Zn polluted soil serving as soil to be repaired into an inner cavity of a repair groove, wherein the repair time is 13 days, and the electric energy generated by the solar cell panel is stored in the storage battery and the voltage gradient is set to be 1.5V/cm through the voltage regulator.
(2) 0.2mol/L citric acid is filled in the agent storage tank to be used as an agent, the citric acid is injected into the soil to be repaired through the agent pump, after the citric acid and the soil to be repaired are fully mixed, the second regulating valve 19 is opened, and whether heavy metal is precipitated in the soil to block the agent flow is monitored in real time through the flow meter.
(3) And after the citric acid is fully contacted with the soil to be repaired, the power supply is turned on, and the electric repair is carried out for 13 days. And after the restoration time is finished, closing the medicament pump, and taking out the soil after the medicament stops flowing.
After the polluted soil is repaired, the contents of heavy metals Ni and Zn are shown in Table 2:
TABLE 2 remediation effects of Ni-Zn contaminated wheat field soil
Example 3:
the method for repairing the Cr and As polluted paddy soil comprises the following specific steps:
(1) and (3) placing the Cr and As contaminated soil serving As soil to be repaired in an inner cavity of a repair groove, wherein the repair time is 10 days, and electric energy generated by the solar panel is stored in the storage battery and the voltage gradient is set to be 2V/cm through the voltage regulator.
(2) 0.2mol/L citric acid is filled in the agent storage tank to be used as an agent, the citric acid is injected into the soil to be repaired through the agent pump, after the citric acid and the soil to be repaired are fully mixed, the second regulating valve 19 is opened, and whether heavy metal is precipitated in the soil to block the agent flow is monitored in real time through the flow meter.
(3) And after the citric acid is fully contacted with the soil to be repaired, a power supply is turned on, and electric repair is carried out for 10 days. And after the restoration time is finished, closing the medicament pump, and taking out the soil after the medicament stops flowing.
After the polluted soil is repaired, the contents of heavy metals Cr and As are shown in Table 3:
TABLE 3 remediation effects of Cr and As-contaminated Rice field soil
Example 4:
the method for carrying out the remediation test on the Hg-polluted paddy soil comprises the following specific steps:
(1) and placing Hg-contaminated soil serving as soil to be repaired into an inner cavity of the repair groove, wherein the repair time is 25 days, and electric energy generated by the solar cell panel is stored in the storage battery and the voltage gradient is set to be 2V/cm through the voltage regulator.
(2) The potassium iodide (KI) is filled in the agent storage tank by 0.1mol/L and used as an agent, the potassium iodide is injected into the soil to be repaired through the agent pump, after the potassium iodide and the soil to be repaired are fully mixed, the second regulating valve 19 is opened, and whether heavy metal is precipitated in the soil to block the agent flow is monitored in real time through the flow meter.
(3) After the potassium iodide is fully contacted with the soil to be repaired, the power supply is turned on and the electric repair is carried out for 25 days. And after the restoration time is finished, closing the medicament pump, and taking out the soil after the medicament stops flowing.
After the polluted soil is repaired, the content of heavy metal Hg is shown in Table 4:
TABLE 4 soil remediation Effect of Hg-contaminated Rice field
Example 5:
the method for repairing the soil of the vegetable field polluted by Cd comprises the following specific steps:
(1) and (3) placing the Cd polluted soil serving as soil to be repaired in an inner cavity of a repair groove, wherein the repair time is 15 days, storing electric energy generated by a solar panel in a storage battery, and setting the voltage gradient to be 1V/cm through a voltage regulator.
(2) The agent storage tank is filled with 0.01mol/L Ethylene Diamine Tetraacetic Acid (EDTA) serving as an agent, the EDTA is injected into the soil to be repaired through the agent pump, after the EDTA and the soil to be repaired are fully mixed, the second regulating valve 19 is opened, and whether heavy metal precipitates in the soil to block the agent flow is monitored in real time through the flow meter.
(3) And after the EDTA fully contacts with the soil to be repaired, turning on a power supply and performing electric repair for 15 days. And after the restoration time is finished, closing the medicament pump, and taking out the soil after the medicament stops flowing.
After the contaminated soil was remediated, the heavy metal Cd content is shown in table 5:
TABLE 5 remediation Effect of Cd-contaminated Rice field soil
The above embodiments show that better effects can be obtained by the application.
Claims (5)
1. A device for light energy-vertical electrokinetic remediation of heavy metal contaminated soil is characterized in that,
comprises a repair groove, a medicament storage tank, a medicament recovery tank, a medicament pump and a direct current power supply;
the repair tank comprises a tank body extending along the vertical direction, the tank body is provided with an inner cavity, the top of the inner cavity is provided with a cathode plate, and the bottom of the inner cavity is provided with an anode plate; a liquid inlet is arranged at the upper end of the tank body, a liquid outlet is arranged at the lower end of the tank body, and a feed inlet is arranged at the top of the tank body; the inlet of the medicament pump is communicated with a medicament storage tank, and the outlet of the medicament pump is communicated with the liquid inlet; the liquid outlet is communicated with the medicament recovery tank through a liquid discharge pipe;
the cathode plate is connected to the negative pole of the direct current power supply, and the anode plate is connected to the positive pole of the direct current power supply.
2. The apparatus of claim 1,
the direct current power supply is a solar power supply device, the solar power supply device comprises a solar power generation panel, a storage battery connected to the solar power generation panel and a voltage regulator connected to the storage battery, the cathode plate is connected to the negative output end of the voltage regulator, and the anode plate is connected to the positive output end of the voltage regulator.
3. The apparatus of claim 1,
a flow meter is mounted on the drain pipe.
4. The apparatus of claim 1,
the anode plate and the cathode plate are both in a plate shape extending along the horizontal direction, and the area of the anode plate is 85-95% of the cross sectional area of the inner cavity of the tank body in the horizontal direction; the area of the cathode plate is 85-95% of the cross section area of the inner cavity of the tank body.
5. The apparatus of claim 1,
in the vertical direction, the anode plate and the cathode plate are opposite up and down and have the same area.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021407826.7U CN212733552U (en) | 2020-07-16 | 2020-07-16 | Device for light energy-vertical electric remediation of heavy metal contaminated soil |
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| CN202021407826.7U CN212733552U (en) | 2020-07-16 | 2020-07-16 | Device for light energy-vertical electric remediation of heavy metal contaminated soil |
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