An electroosmotic repair device for decontamination and dehydration of waste sludge and its use method

Abstract

The present invention discloses an electroosmotic repair device for decontamination and dehydration of waste sludge and a method for using the same. The electroosmotic repair device includes a bottom plate, an anode shell, and a top plate connected in sequence. An electric rotor is provided on the surface of the top plate on a side away from the anode shell. A cathode electrode is provided in the anode shell. One end of the cathode electrode extends out of the top plate and is connected to a vacuum water storage barrel. The vacuum water storage barrel is connected to a vacuum pump. The anode shell and the cathode electrode are both connected to a power supply. A sludge collection barrel is provided on the side of the bottom plate away from the anode shell. A plurality of rotating rods and water collection grooves are provided on the surface of the cathode electrode. The method for using the device includes the following steps: pouring waste sludge and additives; stirring the sludge; turning off the electric rotor, electroosmotic treatment, vacuum pumping; stirring at intervals; collecting the slurry; and power-off cleaning. The present invention combines the reduction and solidification, harmless treatment, and resource recovery in the sludge treatment process into an integrated process, which greatly improves engineering efficiency and reduces energy loss.

Description

Technical Field

[0001] The invention relates to an electroosmotic repair device and a use method thereof, in particular to an electroosmotic repair device for decontamination and dehydration of waste sludge and a use method thereof. Background Art

[0002] Waste sludge is polluted by domestic sewage and industrial and agricultural wastewater, and is enriched with a large number of nitrogen and phosphorus nutrients, organic matter that is difficult to degrade naturally, and toxic heavy metals, among other types of pollutants. If not handled properly, the pollutants in it will be re-released and diffused, causing secondary pollution. Dredged sludge is mostly disposed of by stacking it in a storage yard, and dredging projects generally encounter the problem of lack of storage space. Therefore, if waste sludge remediation technology can be developed and converted into water and soil resources for urban infrastructure, it will not only solve the problem of waste sludge disposal, but also have certain practical value in promoting resource recycling and improving environmental pollution problems.

[0003] Existing technologies and devices for remediating heavy metal contaminated sludge have several limitations: (1) High energy consumption: Vacuum electroosmosis technology relies on a specific electric field strength and vacuum pressure, which leads to relatively high energy consumption. Especially when treating large-scale sludge, the energy consumption problem is particularly prominent and has become an important factor restricting its application. (2) Instability of heavy metal removal effect: During the vacuum electroosmosis process, heavy metal ions migrate to the liquid phase through the electric field, but some metal ions may be re-adsorbed by sludge particles or other solid substances, resulting in fluctuations and instability in the removal effect. (3) Limited scope of application: The treatment effect of this technology on different types of sludge varies significantly. In particular, when the sludge contains bulk organic matter or highly viscous pollutants, the effect of vacuum electroosmosis technology is often unsatisfactory, which limits its wide application in diverse sludge types. (4) High equipment investment and maintenance costs: This technology requires special equipment to maintain the vacuum and electric field environment, which leads to high initial investment and long-term maintenance costs. In addition, the equipment may suffer from problems such as corrosion or blockage during long-term operation, further increasing the operation and maintenance burden. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a reusable electroosmotic repair device for waste sludge decontamination and dehydration that can realize wastewater resource utilization. Another purpose of the present invention is to provide a method for using the electroosmotic repair device for waste sludge decontamination and dehydration that has high working efficiency and good treatment effect.

[0005] Technical solution: The electroosmosis repair device for decontamination and dehydration of waste sludge described in the present invention includes a bottom plate, an anode shell, and a top plate connected in sequence. An electric rotor is provided on the surface of the top plate away from the anode shell, and a cathode electrode is provided in the anode shell. One end of the cathode electrode extends out of the top plate and is connected to a vacuum water storage barrel. The vacuum water storage barrel is connected to a vacuum pump. The electric rotor can drive the top plate and the cathode electrode to rotate and stop synchronously; the anode shell and the cathode electrode are both connected to a power supply; a sludge collection barrel is provided on the side of the bottom plate away from the anode shell; and a plurality of rotating rods and water collection grooves are provided on the surface of the cathode electrode.

[0006] Furthermore, the bottom plate includes a first mud guard baffle and a second mud guard baffle that can rotate coaxially relative to each other. The diameter of the first mud guard baffle is smaller than that of the second mud guard baffle. A detachable clip is provided at the edge to fix it to the second mud guard baffle. The second mud guard baffle is fixedly connected to the anode shell.

[0007] Furthermore, a circular hole for sludge discharge and a square slot fixedly connected to the cathode electrode are provided on the first mud baffle, and an elliptical hole for sludge discharge is provided on the second mud baffle. The circular hole and the elliptical hole are relatively timed to discharge sludge into the sludge collection bucket.

[0008] Furthermore, a plurality of slotted plates evenly spaced apart are provided on the inner wall of the anode housing, an anode electrode plate is provided on the slotted plate, and the anode electrode plate is connected to the anode conductor coil via a metal conductive probe.

[0009] Furthermore, the cathode electrode is a hollow thin-walled rectangular parallelepiped iron plate.

[0010] Furthermore, the rotating rod is a spiral stirring paddle, which is fixedly connected to the threaded limiting rod on the surface of the cathode electrode, and a filter geotextile is provided on the surface of the water collection groove.

[0011] Furthermore, a vacuum water pumping pipe is provided at one end of the cathode electrode close to the top plate, and the vacuum water pumping pipe is connected to the vacuum water storage barrel through a first vacuum hose.

[0012] Furthermore, an anode wire connection hole, an additive injection pipe, and a vacuum joint are provided on the top plate. The anode wire connection hole is passed through by a wire, and the vacuum joint can be sealed and connected to the vacuum water pumping pipe.

[0013] Furthermore, the vacuum water storage tank is connected to the vacuum pump via a second vacuum hose.

[0014] The method for using the electroosmotic repair device for decontamination and dehydration of waste sludge according to the present invention comprises the following steps:

[0015] S1. Assemble the bottom plate, anode housing, and cathode electrode, pour the waste sludge to be treated into them, cover the top plate, and pour the additives required for sludge treatment;

[0016] S2. Connect the electric rotor, fasten the buckle between the top plate and the cathode electrode, turn on the power switch of the electric rotor, and drive the cathode electrode to stir the sludge;

[0017] S3. After the stirring is completed, turn off the power switch of the electric rotor to perform electroosmosis treatment, connect the cathode electrode, vacuum water storage bucket, and vacuum pump in sequence, turn on the vacuum pump to start vacuum pumping;

[0018] S4. After every 1-2 hours of electroosmosis treatment, disconnect the anode housing, cathode electrode and power supply, remove the vacuum connector from the second vacuum hose and vacuum water storage bucket, and turn on the electric rotor again to stir the sludge;

[0019] S5. After 8 to 10 hours of electroosmosis, the bottom plate moves relative to each other, and the slurry after reduction and harmlessness treatment is collected until the electroosmosis drainage volume in the vacuum water storage tank no longer increases;

[0020] S6. After the electroosmosis is completed, the power is turned off for cleaning. At the same time, the anode shell and cathode electrode are dismantled for inspection and recycling.

[0021] Working Principle: Electroosmosis is an in-situ remediation technology that utilizes an applied electric field gradient to migrate, separate, and remove charged pollutants from the soil. The "decontamination and dehydration" principle relies primarily on the electrokinetic effects that occur when electrification of the soil occurs: electromigration, electroosmosis, and electrophoresis, among others. This is combined with the adsorption and desorption of heavy metal ions, and the complexation and flocculation of chelating agents and flocculants to remediate contaminated waste sludge. During the electroosmosis process, where direct current promotes the migration of heavy metal ions, heavy metal ions carry water molecules from the anode to the cathode due to hydration. Simultaneously, the electrical disinfection effect and electromigration phenomenon are utilized to remove harmful microorganisms and heavy metal ions from the sludge, minimizing the impact of soil barrier factors. This achieves a simultaneous reduction and harmlessness treatment model, thereby reducing the disposal costs of traditional waste sludge treatment processes.

[0022] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0023] 1. The sludge treatment process includes reduction and solidification, harmless treatment, and resource recovery as an integrated process. At the same time, the electroosmotic vacuum intermittent dehydration solution is adopted, which greatly improves the project efficiency and reduces energy loss.

[0024] 2. Reasonable use of the advantages of electroosmosis and vacuum drainage can better promote the discharge of sludge pore water, and inject additives into the filtrate during sludge treatment to treat the filtrate and realize the resource utilization of wastewater;

[0025] 3. The rotor drives the integrated multifunctional cathode to stir the slurry, promotes all-round drainage of the slurry, makes the injection of chelating agents and flocculants more uniform, and improves the stability of heavy metal ion removal;

[0026] 4. The anode electrode and the integrated multifunctional cathode are assembled structures. Suitable conductive materials can be selected at any time to serve as electrodes according to the properties of the slurry. If the electrode corrosion is small, it can be reused and replaced at any time, reducing the burden of operation and maintenance.

[0027] 5. This device can be applied to the repair of any sludge. It can not only select electrodes and treatment additives according to the properties of the slurry, but also flexibly formulate electroosmosis-vacuum treatment plans. After the test, it can be cleaned and reused, with high economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the base plate 1 of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the anode housing 2 of the present invention;

[0031] Figure 4 Schematic diagram of the structure of the cathode electrode 5 of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the top plate 3 of the present invention. DETAILED DESCRIPTION

[0033] like Figure 1 The anode shell 2 of the electroosmotic repair device for decontamination and dehydration of waste sludge is located on the upper part of the rotating base plate 1. The outer edge of the base plate 1 is fixedly connected to the anode shell 2. The integrated multifunctional cathode electrode 5 is fixed in the central groove of the base plate 1. One end of the cathode electrode 5 extends out of the top plate 3 and is connected to the vacuum water storage barrel 6 through the first vacuum hose 11. The vacuum water storage barrel 6 is connected to the vacuum pump 7 through the second vacuum hose 10. The top plate 3 is connected to the anode shell 2, and the electric rotor 4 is fixed to the top plate 3. The electric rotor 4 can drive the top plate 3 and the cathode electrode 5 to rotate and stop synchronously. After the chelating agent and flocculant are injected, the additive injection pipe 302 can be closed to avoid vacuum loss. At the same time, in order to prevent excessive energy consumption and excessive solidification, the vacuum pump 7 can set the start-up and operation time according to the sludge treatment situation.

[0034] like Figure 2The base plate 1 includes a first mud guard 101 and a second mud guard 102, which are rotatable relative to each other. The diameter of the first mud guard 101 is smaller than that of the second mud guard 102. A detachable clip is provided at the edge of the first mud guard 101 to secure it to the second mud guard 102. The second mud guard 102 is fixedly connected to the upper anode housing 2 via a retaining device. The first mud guard 101 has 12 circular holes 103 for sludge discharge, arranged in a row of three. A square notch 104 is also provided in the center of the first mud guard 101 to facilitate fixed rotation with the cathode electrode 5. The second mud guard 102 has four elliptical holes 105 for sludge discharge. A circular groove is provided between the first mud baffle 101 and the second mud baffle 102, which contains steel balls for relative rotation between the two, thereby achieving relative alignment between the circular hole 103 and the elliptical hole 105, and the sludge is "decontaminated and dehydrated" and discharged into the sludge collection bucket 9.

[0035] like Figure 3 As shown, the anode housing 2 is secured to the second mud barrier 102 via a retaining device. The trough plate 201 is secured by nuts on the sidewalls of the anode housing 2. Anode electrode plates 202 can be installed in grooves on the surface of the trough plate and are removable, allowing for installation of varying numbers of anode electrode plates 202 depending on the amount of sludge to be processed. Metal conductive probes are inserted into the upper portion of the trough plate. These probes pass through the electrode channel of the top plate 3 and connect to the anode conductor coil 203, which in turn connects to the external power supply 8 to form an electroosmosis circuit.

[0036] like Figure 4 As shown, the cathode electrode 5 is a hollow, thin-walled rectangular iron plate, fixed in position in the central groove of the first mud barrier 101. The surface of the cathode electrode 5 is provided with a uniform array of water collection grooves 502, with a vertical vacuum pumping channel in the center. A vacuum pumping pipe 505 is inserted into this vertical channel. A filter geotextile 504 is attached to the surface of the water collection groove 502 to prevent silt clogging of the drainage channel. A rotating rod 501 is connected to the cylindrical grooves and threaded limit rod 503 distributed in an array on the surface of the cathode electrode 5. The surface is attached with spiral blades, that is, the rotating rod 501 acts as a spiral stirring paddle. The cathode electrode 5, vacuum pumping pipe 505, filter geotextile 504, and rotating rod 501 are assembled to form an integrated multifunctional cathode electrode 5.

[0037] like Figure 5 As shown, the top plate 3 includes an anode wire connection hole 301, an additive injection tube 302, and a vacuum connector 303. Anode wire connection hole 301 is located within a circular notch on the outer periphery of the top plate 3. A power supply wire passes through this hole and connects to a conductive metal probe on the fixed trough plate 201 below. The vacuum connector 303 is sealed to the hollow vacuum water extraction tube 501 in the cathode electrode 5, allowing electroosmotic contamination liquid to be extracted from the cathode electrode 5.

[0038] The electric rotor 4 is fixed to the upper part of the top plate 3. The top plate is provided with a snap groove for limiting the displacement of the cathode electrode 5, so that the electric rotor 4 can drive the top plate 3 and the cathode electrode 5 to rotate as a whole. The rotating rod 503 installed on the cathode electrode 5 can also stir the slurry accordingly, thereby evenly mixing the chelating agent and flocculant, and preventing the slurry from being excessively drained and solidified and unable to be discharged.

[0039] The method for using the electroosmotic repair device for decontamination and dehydration of waste sludge in this embodiment includes the following steps:

[0040] S1. Install the base plate 1, anode housing 2 and cathode electrode 5 according to the amount of waste sludge to be processed, and distribute and position them to access the processing device.

[0041] S2. After the waste sludge is filled into the treatment device, the top plate 3 is covered, and at the same time, additives required for treating the sludge, such as chelating agents, flocculants, etc., are poured in through the additive injection pipe 302.

[0042] S3. Connect the electric rotor 4 to the device, fasten the detachable buckle between the top plate 3 and the cathode electrode 5, turn on the power switch of the electric rotor 4, and make the rotating rod 501 stir the sludge.

[0043] S4. After the stirring is completed, the electric rotor 4 is turned off, a DC power supply is passed into the device for electroosmosis treatment, and the vacuum pump 7 is turned on to start vacuum pumping.

[0044] S5. After the electroosmosis treatment every hour, the electric rotor 4 is turned on again to stir the sludge to prevent the slurry from solidifying and being unable to be discharged into the sludge collection bucket 9.

[0045] S6. After eight hours of electroosmosis, open the buckle on the first mud baffle 101 in the bottom plate 1, so that the first mud baffle and the second mud baffle rotate relative to each other, and collect the slurry after the reduction and harmless treatment until the electroosmosis drainage volume in the vacuum water storage barrel 6 no longer increases.

[0046] S7. After the electroosmosis is completed, the power is turned off and the device is cleaned. At the same time, the anode housing 2 and the cathode electrode 5 are dismantled for inspection and recycling.

[0047] Multiple electroosmotic anode housings 2 can be provided within the range of the sludge to be treated, and arranged according to the circumference of the grooved plate of the anode housing 2 to improve the electroosmotic efficiency. The test precautions for this method are as follows:

[0048] a. All components should be assembled strictly before using the device to prevent them from being dislocated and damaged when the device is rotated.

[0049] b. Appropriate additives should be selected according to the properties of the waste sludge slurry being treated, and a specific and efficient "decontamination and dehydration" treatment should be carried out to fully reflect the advantages of the one-step treatment of the device.

[0050] c. The speed of the electric rotor 4 should be controlled to prevent the rotating rod 501 from being broken due to excessive resistance caused by excessive speed. When restarting the electric rotor 4 in the subsequent electroosmosis process, the first vacuum hose 11, the second vacuum hose 10, and the power supply wire should be removed to prevent them from being damaged during the rotation process.

[0051] d. After each electroosmosis repair, the corrosion of the anode shell 2 and cathode electrode 5 should be checked. If the corrosion is light, they can be reused. If the corrosion is serious, the electrodes need to be replaced.

[0052] e. During electroosmosis, pay attention to the drainage capacity of the vacuum water storage tank 6 to ensure effective drainage. After electroosmosis, pay attention to cleaning the small holes in the device and replace the filter geotextile 504 in time to prevent blockage and affect its reuse.

Claims

1. An electroosmotic remediation device for decontamination and dehydration of waste sludge, characterized by: It comprises a bottom plate (1), an anode shell (2), and a top plate (3) connected in sequence, an electric rotor (4) is provided on the surface of the top plate (3) away from the anode shell (2), a cathode electrode (5) is provided in the anode shell (2), one end of the cathode electrode (5) extends out of the top plate (3) and is connected to a vacuum water storage barrel (6), the vacuum water storage barrel (6) is connected to a vacuum pump (7), and the electric rotor (4) can drive the top plate (3) and the cathode electrode (5) to rotate and stop synchronously; the anode shell (2) and the cathode electrode (5) are both connected to a power source (8); a sludge collection barrel (9) is provided on the side of the bottom plate (1) away from the anode shell (2); and a plurality of rotating rods (501) and water collection grooves (502) are provided on the surface of the cathode electrode (5); The cathode electrode (5) is a hollow thin-walled rectangular iron plate; The rotating rod (501) is a spiral stirring paddle, fixedly connected to the threaded limiting rod (503) on the surface of the cathode electrode (5), and a filtering geotextile (504) is provided on the surface of the water collecting groove (502); A vacuum water pumping pipe (505) is provided at one end of the cathode electrode (5) close to the top plate (3), and the vacuum water pumping pipe (505) is connected to the vacuum water storage barrel (6) via a first vacuum hose (11); The top plate (3) is provided with an anode wire connection hole (301), an additive injection pipe (302), and a vacuum joint (303). The anode wire connection hole (301) is passed through by a wire, and the vacuum joint (303) can be sealed and connected to a vacuum water extraction pipe (505).

2. The electroosmotic repair device for waste sludge decontamination and dehydration according to claim 1, characterized in that: The bottom plate (1) comprises a first mud guard baffle (101) and a second mud guard baffle (102) which are coaxially rotatable relative to each other, the diameter of the first mud guard baffle (101) being smaller than the diameter of the second mud guard baffle (102), a detachable clip fixed to the second mud guard baffle (102) being provided at an edge of the first mud guard baffle (101), and the second mud guard baffle (102) being fixedly connected to the anode housing (2).

3. The electroosmotic repair device for waste sludge decontamination and dehydration according to claim 2, characterized in that: The first mud guard baffle (101) is provided with a circular hole (103) for sludge discharge and a square notch (104) fixedly connected to the cathode electrode (5), and the second mud guard baffle (102) is provided with an elliptical hole (105) for sludge discharge. The first mud guard baffle (101) and the second mud guard baffle (102) are capable of relative rotation, and the circular hole (103) and the elliptical hole (105) are relatively timed to discharge sludge into the sludge collection bucket (9).

4. The electroosmotic repair device for waste sludge decontamination and dehydration according to claim 1, characterized in that: The inner wall of the anode housing (2) is provided with a plurality of slotted plates (201) evenly spaced apart, an anode electrode plate (202) is provided on the slotted plates (201), and the anode electrode plate (202) is connected to an anode conductor coil (203) via a metal conductive probe.

5. The electroosmotic repair device for waste sludge decontamination and dehydration according to claim 1, characterized in that: The vacuum water storage barrel (6) is connected to the vacuum pump (7) via a second vacuum hose (10).

6. A method for using the electroosmotic repair device for decontamination and dehydration of waste sludge according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, assembling the bottom plate (1), the anode housing (2), and the cathode electrode (5), pouring the waste sludge to be treated into them, covering them with the top plate (3), and pouring the additives required for treating the sludge; S2, connecting the electric rotor (4), fastening the buckle between the top plate (3) and the cathode electrode (5), turning on the power switch of the electric rotor (4), and driving the cathode electrode (5) to stir the sludge; S3. After the stirring is completed, the power switch of the electric rotor (4) is turned off to perform electroosmosis treatment, and the cathode electrode (5), the vacuum water storage bucket (6), and the vacuum pump (7) are connected in sequence. The vacuum pump (7) is turned on to start vacuum pumping; S4. After the electroosmosis treatment is continued for 1 to 2 hours, the connection between the anode housing (2), the cathode electrode (5) and the power supply (8) is disconnected, the connection between the vacuum connector (303), the second vacuum hose (10) and the vacuum water storage bucket (6) is removed, and the electric rotor (4) is turned on again to stir the sludge; S5. After 8 to 10 hours of electroosmosis, the bottom plate (1) is relatively displaced, and the slurry after the reduction and harmless treatment is collected until the electroosmotic drainage volume in the vacuum water storage tank (6) no longer increases; S6. After the electroosmosis is completed, the power is turned off and the anode housing (2) and cathode electrode (5) are dismantled for inspection and recycling.

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