CN111302580A - Method for removing heavy metals in sludge - Google Patents
Method for removing heavy metals in sludge Download PDFInfo
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- CN111302580A CN111302580A CN202010247881.2A CN202010247881A CN111302580A CN 111302580 A CN111302580 A CN 111302580A CN 202010247881 A CN202010247881 A CN 202010247881A CN 111302580 A CN111302580 A CN 111302580A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention belongs to the field of treatment and disposal of sludge containing heavy metals in environmental protection, and particularly relates to a method for removing heavy metals in sludge. The method comprises the steps of acidizing sludge containing heavy metals, adjusting the pH value of the sludge to be weakly acidic, balancing for at least 5 hours, placing the sludge in a sludge chamber of a sludge electrolysis device, adding organic acid into the sludge chamber to serve as an eluent, enabling the eluent to be combined with the heavy metals in the sludge chamber through desorption, dissolution or complexation under the action of an electric field to form a migratory compound, moving the migratory compound to a cathode chamber, and migrating the sludge out under the action of electric force to obtain the sludge repaired through electric elution.
Description
Technical Field
The invention belongs to the field of treatment and disposal of sludge containing heavy metals in environmental protection, and particularly relates to a method for removing heavy metals in sludge.
Background
The repair technology of the sludge containing heavy metals mainly comprises the following methods: (1) the biological leaching is to transfer heavy metals in the sludge into a liquid phase under an acidic condition, then to separate solid from liquid to obtain clean sludge, which is a treatment mode with a good effect at present, but the time consumption is long, generally 8-10 days are needed, the process condition is strict, and the existence of the heavy metals can also generate toxic action on leached microorganisms. (2) The chemical oxidation remediation technology mainly utilizes the oxidation effect of chemical agents, and converts pollutants in the sludge into low-toxicity forms through chemical reaction change, so that the aim of reducing the environmental risk of the heavy metal sludge is fulfilled. Because the added chemical agent has strong pertinence and quick restoration, a small amount of heavy metal sludge is effectively restored, and whether the added chemical agent can cause secondary pollution or not is considered. (3) Electric repair technology: the electric repairing technology has a plurality of mechanisms, such as electromigration, electroosmotic flow, electrophoresis and the like, coexisting in the sludge repairing process. And applying uniform electric fields at two ends of the sludge, wherein ionic pollutants move to the opposite electrode under the action of electromigration, and the flow of electrode liquid in the sludge enriches the nonionic pollutants in the electrode area. However, the traditional electrochemical treatment device has low electrolysis efficiency, so the improvement of the electrochemical treatment method is the key for electrically repairing the heavy metal sludge.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a method for removing heavy metals in sludge, which improves the removal rate of the heavy metals in the sludge by combining electric leaching and rinsing to treat the heavy metal sludge, thereby solving the technical problem of low removal efficiency of the heavy metals in the sludge in the prior art.
In order to achieve the aim, the invention provides a method for removing heavy metals in sludge, which comprises the following steps:
(1) acidifying sludge containing heavy metals, adjusting the pH of the sludge to be weakly acidic, and balancing for at least 5 hours to obtain acidified sludge;
(2) and (2) placing the sludge subjected to acidification treatment obtained in the step (1) in a sludge chamber of a sludge electrolysis device, adding organic acid into the sludge chamber as an eluent, wherein the eluent is combined with heavy metals in the sludge chamber through desorption, dissolution and/or complexation under the action of an electric field to form a transferable compound, and the compound moves towards a cathode chamber and migrates out of the sludge under the action of electric force to obtain the sludge repaired by electric elution.
Preferably, step (1) is specifically: after mixing sludge containing heavy metals with water, adjusting the pH of the sludge to 4-5 with an acid.
Preferably, the volume ratio of the sludge containing heavy metals to water is between 1/5 and 1/3.
Preferably, the sludge electrolysis device in the step (2) is electrically leached under the condition that the voltage gradient is 1.0-1.5v/cm, the organic acid is continuously added into the catholyte in the electrolysis process, and the pH value of the cathode chamber is kept to be 4-5.
Preferably, the sludge electrolyzing device in the step (2) comprises a cathode chamber, a sludge chamber and an anode chamber, wherein the cathode in the cathode chamber is a rotatable cathode, and a scaling plate matched with the cathode is arranged below the cathode chamber and used for scraping dirt deposited on the cathode by the scaling plate through the rotation of the cathode.
Preferably, the anode chamber and the sludge chamber in the step (2) are separated by an anode plate, and the surface of the anode plate is provided with a hole structure; the cathode chamber and the sludge chamber are separated by a partition plate, and the surface of the partition plate is provided with a hole structure; the cathode is positioned in the cathode chamber, and the cathode and the anode plate are respectively connected with the cathode and the anode of the power supply; the cathode is in a wheel shape and is connected with the inner wall of the sludge electrolysis device through a fixed shaft, and the periphery of the fixed shaft is sleeved with a bearing, so that the cathode rotates around the bearing.
Preferably, the organic acid in step (2) is one or more of oxalic acid, acetic acid and citric acid.
Preferably, the eluting agent in the step (2) is added into the sludge chamber by spraying.
Preferably, the method further comprises the steps of:
(3) and (3) uniformly mixing the sludge subjected to electric leaching restoration and obtained in the step (2) with soil, and planting plants, wherein the plants can absorb and retain heavy metals in the sludge, and the heavy metals in the sludge are removed by utilizing the absorption and retention effects of the plants on the heavy metals in the sludge.
Preferably, the plant of step (3) is paspalum natatum, bermuda grass or chloranthus spicatus.
Preferably, the mass ratio of the sludge recovered by electric leaching in the step (3) to the soil is 2/3-3/2.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the invention provides a novel method for treating heavy metal sludge by combining electric leaching and leaching, which is characterized in that acidification pretreatment is carried out before sludge treatment, meanwhile, organic acid is added as an eluent on the basis of a traditional electrochemical device, the activity of heavy metals in the sludge is improved by using the acidic eluent, the migration of the heavy metals is facilitated, the electric remediation efficiency is improved, and the treatment period is short.
(2) The organic acid eluting agent adopted by the invention can form a water-soluble complex with metal, and has biodegradability and good environmental safety.
(3) The invention uses the sludge after electrochemical treatment for plant planting to further remove heavy metals from the sludge by utilizing the absorption and retention effects of plants on the heavy metals.
(4) The preferred embodiment of the invention adopts the plant paspalum natatum which has strong planting resistance and vigorous reproductive capacity and is suitable for large-scale planting and simultaneously achieves the purpose of greening the environment.
(5) According to the invention, the metal compound transferred to the cathode chamber of the electrolytic device through electric leaching can cause the accumulation of hydroxide precipitate under the reduction action of the cathode, so that the normal operation of the electrolytic device is influenced. The heavy metal removal route in the sludge of the present invention includes heavy metal precipitation removed in the cathode chamber by the scaling plate, and also includes heavy metal absorbed or retained by plants.
(6) According to the heavy metal sludge treatment method provided by the invention, the electric-leaching-biological combination arrangement is adopted, so that the content of heavy metals in the heavy metal sludge can be effectively reduced, in some embodiments, the method can reduce the content of Cu in the sludge from 3000 mg/kg-4000 mg/kg to below 1500mg/kg, and the requirements of related national standards such as sludge landscaping and land improvement are met.
Drawings
FIG. 1 is a schematic diagram of the method for removing heavy metals from sludge according to the present invention.
FIG. 2 is a schematic view of an electrolytic apparatus in example 1 of the present invention.
FIG. 3 is a schematic view of the cathode of the electrolytic apparatus of example 1 of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-electrolysis device, 2-spray header, 3-cathode, 4-filter material chamber, 5-anode chamber, 6-cathode chamber, 7-sludge chamber, 8-anode plate, 9-clapboard, 10-fixed shaft, 11-bearing, 12-clamping groove, 13-scaling plate, 14-eluent regeneration chamber, 15-eluent collection chamber and 16-pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a method for removing heavy metals in sludge, which comprises the following steps:
(1) sludge acidification treatment: acidifying sludge containing heavy metals, adjusting the pH of the sludge to be weakly acidic, and balancing for at least 5 hours to obtain acidified sludge;
(2) electric leaching repair: and (2) placing the sludge subjected to acidification treatment obtained in the step (1) in a sludge chamber of a sludge electrolysis device, adding organic acid into the sludge chamber as an eluent, wherein the eluent is combined with heavy metals in the sludge chamber through desorption, dissolution and/or complexation under the action of an electric field to form a transferable compound, and the compound moves towards a cathode chamber and migrates out of the sludge under the action of electric force to obtain the sludge repaired by electric elution.
The sludge containing heavy metals can be sludge containing heavy metals generated in various industrial processes such as water treatment and the like, and can also be natural sludge polluted by heavy metals and the like.
In some embodiments, the weak acidity of step (1) specifically means a pH greater than 4 and less than 7, and the present invention is preferably between 4 and 5.
In some embodiments, step (1) is specifically: after mixing sludge containing heavy metals with water, adjusting the pH of the sludge to 4-5 with an acid. The volume ratio of the sludge containing the heavy metals to the water is between 1/5 and 1/3. In some embodiments, the heavy metal sludge is added with deionized water according to the mass ratio of the deionized water to the dry matter of the sludge of 3:1-5:1, and then a certain amount of dilute nitric acid is added into the sludge to adjust the pH of the sludge to be weakly acidic and balance for at least 5 hours. The sludge acidification pretreatment can reduce the influence of cation exchange capacity, increase the conductivity, improve the current and facilitate the electromigration of heavy metals.
In some embodiments, the eluent in step (2) is added into the sludge chamber by spraying, and the eluent is brought into the sludge by utilizing the flowing action of electroosmotic current in the sludge to improve the desorption efficiency of heavy metals, and the eluent is combined with the heavy metals in the sludge chamber by desorption, dissolution or complexation under the action of an electric field to form a migratory compound to move to the cathode chamber, and the migratory compound moves out of the sludge chamber to enter the cathode chamber under the action of electric force.
Heavy metal form analysis adopts a Tessier five-step extraction method to divide heavy metal in sludge into exchangeable form, iron-manganese oxide combined form, carbonate combined form, organic combined form and residue form, wherein the residue form is stable and cannot be decomposed and utilized by organisms.
In some embodiments, after the power supply in the step (2) is switched on, the sludge electrolysis device is electrically leached under the condition that the voltage gradient is 1.0v/cm-1.5 v/cm. And (3) compounds which are transferred to the cathode chamber through electrokinetic leaching and comprise heavy metal ions and various metal ion compounds in the sludge form hydroxide precipitates under the action of cathode reduction, in some embodiments, organic acid is continuously added into the catholyte in the electrolysis process in the step (2), the pH of the cathode chamber is kept to be 4-5, the sludge in the cathode region is kept to be acidic, and the metal and heavy metal precipitates formed in the cathode part are effectively reduced.
In some embodiments, the sludge electrolyzing device in step (2) comprises a cathode chamber, a sludge chamber and an anode chamber, wherein the cathode in the cathode chamber is a rotatable cathode, and a scaling plate matched with the cathode is arranged below the cathode chamber and used for scraping off dirt deposited on the cathode by the scaling plate through the rotation of the cathode.
In some embodiments, the anode chamber and the sludge chamber in the step (2) are separated by an anode plate, and the surface of the anode plate is provided with a hole structure; the cathode chamber and the sludge chamber are separated by a partition plate, and the surface of the partition plate is provided with a hole structure; the cathode is positioned in the cathode chamber, and the cathode and the anode plate are respectively connected with the cathode and the anode of the power supply; the cathode is in a wheel shape and is connected with the inner wall of the sludge electrolysis device through a fixed shaft, and the periphery of the fixed shaft is sleeved with a bearing, so that the cathode rotates around the bearing.
In some embodiments, before the electrolysis device in step (2) is operated, electrolyte is added into the anode chamber to ensure that the electrolysis reaction is smoothly carried out. Since the chemical reaction of the two-end electrodes is mainly the electrolysis of water, the electrolyte can be any conductive electrolyte such as water, acid, surfactant and the like, and the proper electrolyte can be selected according to different pollutants and cost. In some embodiments, an eluent is added to each of the cathode compartment, sludge compartment, and anode compartment of the electrolyzer. The cathode of the electrolysis device can be made of stainless steel materials, and the anode plate can be made of titanium electrodes coated with yttrium oxide coatings. The cathode is subjected to reduction reaction, the anode is subjected to oxidation reaction, and the electrolysis reaction generates a large amount of H at the anode and the cathode respectively+And OH-.
In some embodiments, the organic acid in step (2) is a low molecular weight organic acid such as oxalic acid, acetic acid or citric acid.
In some embodiments, the method further comprises the step (3) of bioremediation: and (3) uniformly mixing the sludge subjected to electric leaching restoration and obtained in the step (2) with soil, and planting plants, wherein the plants can absorb and retain heavy metals in the sludge, and the heavy metals in the sludge are removed by utilizing the absorption and retention effects of the plants on the heavy metals in the sludge.
In some embodiments, the plant of step (3) is paspalum natatum, bermuda grass, or chloranthus spicatus, among others.
In some embodiments, the sludge obtained in the step (2) and the common soil are uniformly mixed in the step (3) according to the mass ratio of 3:2, and a proper amount of water is added to the mixture at a ratio of 90g/m2When the paspalum natatum seeds are scattered, the sludge is rich in organic matters and nutritional ingredients, so that a suitable habitat can be provided for the paspalum natatum, and meanwhile, the paspalum natatum achieves the effect of further removing heavy metals from the sludge due to the absorption and retention effects of the paspalum natatum to the heavy metals in the sludge.
The following are examples:
example 1
A method for removing heavy metals in sludge, as shown in fig. 1, comprising the following steps:
1. sludge acidification pretreatment: crushing industrial sludge with the heavy metal Cd content of 544.61mg/kg, adding deionized water according to the mass ratio of the deionized water to the sludge dry matter of 3:1, uniformly stirring, adding a certain amount of dilute nitric acid into the sludge to adjust the pH value of the sludge to 6, and balancing for 8 hours.
2. Electric-leaching repair: assembling an electrolysis apparatus, as shown in fig. 2, comprising an anode chamber 5, a cathode chamber 6 and a sludge chamber 7; the anode chamber 5 and the sludge chamber 7 are separated by an anode plate 8, and the surface of the anode plate 8 is provided with a hole structure; the cathode chamber 6 and the sludge chamber 7 are separated by a partition plate 9, and the surface of the partition plate 9 is provided with a hole structure; the cathode 3 is positioned in the cathode chamber 6, and the cathode 3 and the anode plate 8 are respectively connected with the negative electrode and the positive electrode of a power supply; the cathode 3 is wheel-shaped and is connected with the inner wall of the electrolysis device 1 through a fixed shaft 10, and the periphery of the fixed shaft 9 is sleeved with a bearing 11, so that the cathode 3 rotates around the bearing 11, as shown in figure 3.
The spray header 2 is positioned right above the electrolysis device 1; clamping grooves 12 are distributed on two opposite sides of the inner wall of the electrolysis device 1, and the clamping grooves 12 are used for fixing the anode plate 8 and the partition plate 9; the spray header 2 is used for spraying the eluting agent into the anode chamber 5 and the sludge chamber 7, the eluting agent is combined with pollutants in the sludge chamber 7 through desorption, dissolution or complexation under the action of an electric field to form a migratory compound which moves to the cathode chamber 6, and the compound is deposited on the surface of the cathode 3; the lower surface of the cathode 3 is contacted with a scale scraping plate 13, and the scale scraping plate 13 is used for scraping dirt deposited on the anode 3 when the cathode 3 rotates; the filter material chamber 4 is positioned under the cathode chamber 6, and the filter material chamber 4 is used for separating the feed liquid in the cathode chamber 6. The cathode 3 is designed in a wheel shape, is fixed in the cathode chamber 6 by a fixed shaft 10, can rotate along with a bearing under the control of a motor, and has the rotating speed adjusted according to actual requirements.
The device also comprises an eluent regeneration chamber 14 and an eluent collection chamber 15, wherein the eluent regeneration chamber 14 is positioned below the filter material chamber 4, and the eluent regeneration chamber 14 is used for containing medicaments to enable pollutants in feed liquid flowing out of the filter material chamber 4 to generate precipitates or remove gas so as to obtain regenerated eluent; a screen is fixed on the cross section of the outlet of the leacheate regeneration chamber 14; the eluent regeneration chamber 14 is positioned in an eluent collection chamber 15, and the eluent collection chamber 15 is used for collecting regenerated eluent and unused eluent in the anode chamber 5; the eluent collection chamber 15 is connected to a pump 16, and the pump 16 is used for pumping the regenerated eluent in the eluent collection chamber 15 into the shower head 2.
Wherein, the specification of the sludge chamber in the embodiment is 150mm multiplied by 100mm multiplied by 80mm, and the specification of the anode chamber is as follows: 80mm × 60mm × 80mm, cathode chamber size: 80mm by 60mm by 80 mm. The sludge chamber is connected with the electrode chamber by a flange, and multiple layers of filter paper are laid in the sludge chamber and compacted before experimental sludge loading, so that sludge particles are prevented from entering the electrode chamber through the organic glass pore plate. And (2) placing the sludge in the step (1) in a sludge chamber, adding oxalic acid in a cathode chamber as an eluting agent, carrying the eluting agent into the sludge by utilizing the flowing action of electroosmotic flow in the sludge so as to improve the desorption efficiency of heavy metals, and transferring part of Cd out of the sludge under the action of electric force. Switching on a power supply, adjusting the voltage gradient to 1.0v/cm, continuously adding oxalic acid into the catholyte in the electrolysis process, controlling the pH of the cathode chamber to be 4-5, keeping the sludge in the cathode region acidic, effectively reducing heavy metal precipitates formed at the cathode part, and stopping after electrifying for 6 h. At the moment, the residue state of Cd stability measured by a Tessier five-step extraction method is reduced from initial 203.13mg/kg to 150.33mg/kg, and the organic binding state with lower stability is increased from 30.16mg/kg to 88.61 mg/kg.
3. Biological repair: uniformly mixing the sludge obtained in the step 2 and common soil in a mass ratio of 3:2, and applying a proper amount of water at a ratio of 90g/m2When the paspalum natatum seeds are scattered, the sludge is rich in organic matters and nutritional ingredients, so that a suitable habitat can be provided for the paspalum natatum, and meanwhile, the paspalum natatum achieves the effect of further removing heavy metals from the sludge due to the absorption and retention effects of the paspalum natatum to the heavy metals in the sludge. The retention amount of the root system of the paspalum natatum to Cd reaches 45% after the paspalum natatum grows for 100 days on the mixed substrate of the sludge and the common soil, which shows that the paspalum natatum root system has strong retention effect on heavy metal Cd. After the test is carried out for 130 days, the content of Cd in the composite matrix is reduced to 25mg/kg which is close to the maximum value allowed by the national standard related to land improvement.
Example 2
1. Sludge acidification pretreatment: crushing industrial sludge with the heavy metal Cu content of 3504.63mg/kg, adding deionized water according to the mass ratio of the deionized water to the sludge dry matter of 3:1, stirring uniformly, adding a certain amount of dilute nitric acid into the sludge to adjust the pH value of the sludge to about 5, and balancing for 8 hours.
2. Electric-leaching repair: after the electric leaching device in the example 1 is adopted for treatment for 6 hours, the power is cut off, the treated sludge is subjected to heavy metal morphology measurement by using a Tessier five-step extraction method, and the Cu residue morphology is reduced from initial 782.41mg/kg to 250.03mg/kg, and the carbonate binding morphology is increased from 530.56mg/kg to 1031.22 mg/kg.
3. Biological repair: and (3) uniformly mixing the sludge obtained in the step (2) with common soil according to the mass ratio of 2:3, applying a proper amount of water, and planting a proper amount of bermuda grass seedlings. After the test is carried out for 100 days, the Cu content in the composite matrix is reduced to 1356.61mg/kg, so that the requirement of the related national standards for sludge landscaping, land improvement and the like on the Cu content being less than or equal to 1500mg/kg is met.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The method for removing heavy metals in sludge is characterized by comprising the following steps:
(1) acidifying sludge containing heavy metals, adjusting the pH of the sludge to be weakly acidic, and balancing for at least 5 hours to obtain acidified sludge;
(2) and (2) placing the sludge subjected to acidification treatment obtained in the step (1) in a sludge chamber of a sludge electrolysis device, adding organic acid into the sludge chamber as an eluent, wherein the eluent is combined with heavy metals in the sludge chamber through desorption, dissolution and/or complexation under the action of an electric field to form a transferable compound, and the compound moves towards a cathode chamber and migrates out of the sludge under the action of electric force to obtain the sludge repaired by electric elution.
2. The method according to claim 1, wherein step (1) is specifically: after mixing sludge containing heavy metals with water, adjusting the pH of the sludge to 4-5 with an acid.
3. The method of claim 2, wherein the volume ratio of sludge containing heavy metals to water is between 1/5 and 1/3.
4. The method of claim 1, wherein the sludge electrolyzing device in the step (2) is electrically rinsed under the condition of voltage gradient of 1.0-1.5v/cm, and the organic acid is continuously added into the catholyte during the electrolysis, and the pH of the cathode chamber is kept to be 4-5.
5. The method as set forth in claim 1, wherein the sludge electrolyzing apparatus in the step (2) comprises a cathode chamber, a sludge chamber and an anode chamber, wherein a cathode in the cathode chamber is a rotatable cathode, and a scaling plate matched with the cathode is arranged below the cathode chamber for scraping off dirt deposited on the cathode by the scaling plate by means of the rotation of the cathode.
6. The method of claim 5, wherein the anode chamber and the sludge chamber in the step (2) are separated by an anode plate, and the surface of the anode plate is provided with a hole structure; the cathode chamber and the sludge chamber are separated by a partition plate, and the surface of the partition plate is provided with a hole structure; the cathode is positioned in the cathode chamber, and the cathode and the anode plate are respectively connected with the cathode and the anode of the power supply; the cathode is in a wheel shape and is connected with the inner wall of the sludge electrolysis device through a fixed shaft, and the periphery of the fixed shaft is sleeved with a bearing, so that the cathode rotates around the bearing.
7. The method of claim 1, wherein the organic acid of step (2) is one or more of oxalic acid, acetic acid, and citric acid.
8. The method of claim 1, wherein the eluent in step (2) is added to the sludge chamber by spraying.
9. The method of claim 1, further comprising the step of:
(3) and (3) uniformly mixing the sludge subjected to electric leaching restoration and obtained in the step (2) with soil, and planting plants, wherein the plants can absorb and retain heavy metals in the sludge, and the heavy metals in the sludge are removed by utilizing the absorption and retention effects of the plants on the heavy metals in the sludge.
10. The method of claim 9, wherein the mass ratio of the sludge to the soil of the electrokinetic leaching remediation in the step (3) is between 2/3 and 3/2.
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