Electroosmotic repair apparatus and method of use for decontamination and dewatering of waste sludge

Abstract

To provide an electroosmotic remediation device and its usage method that integrates sludge reduction, detoxification, and resource recovery into a single process, while also improving construction efficiency and reducing energy loss. [Solution] The system includes a base plate 1, an anode case 2, and a top plate 3. An electric rotor 4 is provided on the surface of the top plate away from the anode case, a cathode electrode 5 is provided inside the anode case, one end of the cathode electrode protrudes outside the top plate and is connected to a vacuum water storage tank 6, both the anode case and the cathode electrode are connected to a power supply 8, a sludge collection tank 9 is provided on the side of the base plate away from the anode case, and multiple rotating rods and water collection grooves are provided on the surface of the cathode electrode. The method of use includes the steps of introducing waste sludge and additives, stirring the sludge, vacuum pumping and electroosmotic treatment with the electric rotor turned off, intermittent stirring, collecting the slurry, and cleaning by turning off the power.

Description

Technical Field

[0001] The present invention belongs to an electroosmotic remediation device and its usage method, and specifically, an electroosmotic remediation device for decontamination and dehydration of waste sludge and its usage method.

Background Art

[0002] Waste sludge is contaminated by domestic sewage, industrial and agricultural wastewater, etc., and a large number of types of pollutants such as nitrogen and phosphorus nutrients, organic substances difficult to decompose naturally, and toxic heavy metals are richly collected. If the treatment method is not appropriate, the pollutants in it will be diffused and released again, causing secondary pollution. Most of the treatment methods for dredged sludge mainly involve depositing in a landfill, and dredging projects generally face the problem of insufficient landfill sites. From this, it can be seen that if a waste sludge remediation technology can be constructed and converted into the water and soil resources of urban infrastructure, it not only solves the problem of waste sludge treatment, but also promotes the recycling of resources and has a certain practical value such as improving environmental pollution problems.

[0003] Conventional technologies and equipment for remediating heavy metal-contaminated sludge have several limitations: (1) High energy consumption: Vacuum electroosmosis technology relies on specific electric field strength and vacuum pressure, which results in relatively high energy consumption. This energy consumption problem is particularly pronounced when processing large-scale sludge and is a significant factor limiting its application. (2) Instability of heavy metal removal effect: In the vacuum electroosmosis process, heavy metal ions move to the liquid phase through the electric field, but some metal ions are adsorbed back onto sludge particles or other solid materials, which can cause fluctuations and instability in the removal effect. (3) Limited scope of application: The processing effect of this technology varies significantly depending on the type of sludge. In particular, when the sludge contains lumpy organic matter or highly viscous contaminants, the effect of vacuum electroosmosis technology is unsatisfactory, limiting its broad application to various types of sludge. (4) High capital investment and maintenance costs: This technology requires specialized equipment to maintain the vacuum and electric field environment, which results in high initial investment and long-term maintenance costs. Furthermore, the equipment may experience problems such as corrosion and clogging during long-term operation, further increasing the maintenance burden. [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] Objective of the Invention: In order to overcome the shortcomings of the prior art, the objective of the present invention is to provide an electroosmotic remediation apparatus for decontamination and dewatering of reusable waste sludge, which enables the resource recovery and utilization of wastewater. Another objective of the present invention is to provide a method of using an electroosmotic remediation apparatus for decontamination and dewatering of waste sludge, which has high operational efficiency and good processing effect. [Means for solving the problem]

[0005] Technical proposal: The electroosmotic remediation apparatus for decontamination and dewatering waste sludge described in the present invention includes a bottom plate, an anode case, and a top plate connected in sequence, wherein an electric rotor is provided on the surface of the top plate away from the anode case, a cathode electrode is provided inside the anode case, one end of the cathode electrode protrudes outside the top plate and is connected to a vacuum water storage tank, the vacuum water storage tank is connected to a vacuum pump, the electric rotor can rotate and stop the top plate and the cathode electrode synchronously, both the anode case and the cathode electrode are connected to a power supply, a sludge collection tank is provided on the side of the bottom plate away from the anode case, 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 sludge-stopping plate and a second sludge-stopping plate that are coaxially rotatable relative to each other, the diameter of the first sludge-stopping plate being smaller than the diameter of the second sludge-stopping plate, the edge of the first sludge-stopping plate being provided with a removable locking portion that is fixed to the second sludge-stopping plate, and the second sludge-stopping plate being fixedly connected to the anode case.

[0007] Furthermore, the first sludge-stopping plate is provided with a circular hole for discharging sludge and a square notch that is fixedly connected to the cathode electrode, and the second sludge-stopping plate is provided with an elliptical hole for discharging sludge, and when the circular hole and the elliptical hole are aligned, the sludge is discharged into the sludge collection tank.

[0008] Furthermore, the inner wall of the anode case is provided with multiple groove-shaped plates uniformly distributed at intervals, and anode electrode plates are provided on the groove-shaped plates. The anode electrode plates are connected to the anode wire ring via a metal conductive probe.

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

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

[0011] Furthermore, a vacuum water pump pipe is provided at the end of the cathode electrode near the top plate, and this vacuum water pump pipe is connected to a vacuum water storage tank via a first vacuum hose.

[0012] Furthermore, the top plate is provided with an anode wire hole, an additive injection pipe, and a vacuum fitting. The anode wire hole is used for the passage of the wire, and the vacuum fitting can be connected to the vacuum pumping pipe in a sealed manner.

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

[0014] The method of using the electroosmotic repair apparatus for decontamination and dewatering of waste sludge described in the present invention is: The steps involve assembling S1, the bottom plate, anode case, and cathode electrode, then adding the waste sludge to be processed, placing the top plate on top, and adding the additives necessary for sludge treatment. S2, the steps include connecting the electric rotor, tightening the locking mechanism between the top plate and the cathode electrode, turning on the power switch for the electric rotor, and driving the cathode electrode to agitate the sludge, S3, after stirring is complete, the power switch for the electric rotor is turned off, electroosmosis treatment is performed, the cathode electrode, vacuum reservoir tank, and vacuum pump are connected in order, and the vacuum pump is turned on to start vacuum pumping. S4, after performing electroosmosis treatment every 1-2 hours, disconnect the anode case, cathode electrode and power supply, disconnect the vacuum fitting and second vacuum hose and vacuum water tank, turn the electric rotor on again and agitate the sludge, S5, After electroosmosis for 8-10 hours, the reduced volume and detoxified slurry is collected until the bottom plate shifts relative to the bottom plate and the amount of electroosmotic wastewater in the vacuum storage tank no longer increases. S6 includes the step of, after electroosmosis is complete, turning off the power and cleaning, while simultaneously removing and inspecting the anode case and cathode electrode for recycling.

[0015] Operating Principle: Electroosmosis is an in-situ remediation technique that utilizes an external electric field gradient to move, separate, and remove charged contaminants in soil. The principle of "decontamination and dewatering" relies primarily on the electric effect generated during the energization process of the soil: electrotransfer, electroosmosis, electrophoresis, etc., along with the adsorption and decomposition of heavy metal ions, and the combined action of chelating and coagulating agents, to remediate contaminated waste sludge. In the electroosmosis process, where DC electricity promotes the movement of heavy metal ions, the heavy metal ions move by carrying water molecules from the anode to the cathode due to the hydration effect. Simultaneously, the electro-disinfection effect and the electrotransfer phenomenon are used to remove harmful microorganisms and heavy metal ions in the sludge, reducing the impact of soil damage factors. A synchronous reduction-detoxification treatment mode is achieved, reducing the treatment costs in conventional waste sludge treatment processes. [Effects of the Invention]

[0016] Beneficial Effects: The present invention has the following remarkable features compared to the prior art.

[0017] 1. By integrating volume reduction, hardening, detoxification, and resource recovery in the sludge treatment process, and by adopting an electro-osmotic void dewatering method, construction efficiency is significantly improved and energy loss is reduced.

[0018] 2. By rationally utilizing the advantages of electroosmosis and vacuum drainage, the discharge of sludge pore water can be better promoted, and additives can be injected during sludge treatment to treat the filtrate and realize wastewater resource utilization.

[0019] 3. The rotor moves the integrated multi-functional cathode to agitate the slurry, promoting omnidirectional drainage of the slurry, making the injection of chelating agents and coagulants more uniform and improving the stability of heavy metal ion removal.

[0020] 4. The multifunctional cathode, integrated with the anode electrode, has an assembly structure, allowing for the selection of appropriate conductive materials for the electrode depending on the properties of the slurry. It can be reused when the electrode corrosion is minimal, and the electrode can be replaced at any time, reducing the burden of maintenance.

[0021] 5. This device can be applied to the repair of any sludge. Not only can the electrodes and treatment additives be selected based on the properties of the slurry, but also an electroosmosis-vacuum treatment plan can be flexibly created. Moreover, it can be washed and reused after the test, with high economic efficiency.

Brief Description of the Drawings

[0022] [Figure 1] It is a schematic structural view of the present invention. [Figure 2] It is a schematic structural view of the bottom plate 1 of the present invention. [Figure 3] It is a schematic structural view of the anode case 2 of the present invention. [Figure 4] It is a schematic structural view of the cathode electrode 5 of the present invention. [Figure 5] It is a schematic structural view of the top plate 3 of the present invention.

Embodiments for Carrying out the Invention

[0023] As shown in FIG. 1, the anode case 2 of the electroosmosis repair device for decontamination and dehydration of waste sludge is located above the rotating bottom plate 1. The outer edge of the bottom plate 1 is fixedly connected to the anode case 2. The integrated multifunctional cathode electrode 5 is restricted and fixed in the central concave groove of the bottom plate 1. One end of the cathode electrode 5 protrudes outside the top plate 3 and is connected to the vacuum water storage tank 6 through the first vacuum hose 11. The vacuum water storage tank 6 is connected to the vacuum pump 7 through the second vacuum hose 10. The top plate 3 is connected to the anode case 2, and the electric rotor 4 is fixed to the top plate 3. The electric rotor 4 can rotate and stop the top plate 3 and the cathode electrode 5 synchronously. After injecting the chelating agent and the flocculant, the additive injection pipe 302 can be closed to avoid vacuum loss. Also, in order to avoid too high energy consumption and excessive hardening, the vacuum pump 7 can set the startup operation time according to the sludge treatment situation.

[0024] As shown in Figure 2, the bottom plate 1 includes a relative rotatable first sludge-stopping plate 101 and a second sludge-stopping plate 102, the diameter of which the first sludge-stopping plate 101 is smaller than the diameter of the second sludge-stopping plate 102, and the edge of the first sludge-stopping plate 101 is provided with a removable locking portion that is fixed to the second sludge-stopping plate 102, and the second sludge-stopping plate 102 is fixedly connected to the upper anode case 2 via a limiting device. The first sludge-stopping plate 101 has 12 circular holes 103 for discharging sludge, arranged in rows of three. A square notch 104 is provided in the center of the first sludge-stopping plate 101 to facilitate fixed rotation with respect to the cathode electrode 5. The second sludge-stopping plate 102 has four elliptical holes 105 for discharging sludge. An annular groove is provided between the first sludge-stopping plate 101 and the second sludge-stopping plate 102, and steel balls are installed inside to allow the two plates to rotate relative to each other. Furthermore, when the circular hole 103 and the elliptical hole 105 are aligned, the sludge is decontaminated and dewatered, and the sludge is discharged into the sludge collection tank 9.

[0025] As shown in Figure 3, the anode case 2 is fixed to the second sludge-stopping plate 102 via a limiting device. The grooved plate 201 is fixed to the side wall of the anode case 2 via nuts. The anode electrode plates 202 can be attached to the surface grooves of the grooved plate, and have a detachable function, allowing different numbers of anode electrode plates 202 to be attached depending on the amount of sludge to be processed. A metal conductive probe is inserted into the upper part of the grooved plate, and the metal conductive probe penetrates the electrode passage of the top plate 3 and is connected to the anode wire ring 203, and further connected to the external power supply 8 to form an electroosmotic circuit.

[0026] As shown in Figure 4, the cathode electrode 5 is a hollow, thin-walled, rectangular parallelepiped-shaped iron plate, fixed to the central groove of the first sludge-stopping plate 101. The surface of the cathode electrode 5 is provided with a uniform array of water-collecting grooves 502, and a vertical vacuum water-pumping passage is provided in the center of the cathode electrode 5, into which the vacuum water-pumping pipe 505 is inserted. The filtration geotextile 504 is attached to the surface of the water-collecting grooves 502 to prevent sludge from clogging the drainage passage. The rotating rod 501 is connected to the cylindrical grooves distributed in an array on the surface of the cathode electrode 5, the screw-restricting rod 503, and has a spiral-shaped blade attached to its surface; in other words, the rotating rod 501 is a spiral stirring paddle. The cathode electrode 5, vacuum water-pumping pipe 505, filtration geotextile 504, and rotating rod 501 are assembled and integrated to form a multi-functional cathode electrode 5.

[0027] As shown in Figure 5, the top plate 3 includes an anode wire hole 301, an additive injection tube 302, and a vacuum fitting 303. The anode wire hole 301 is located within an annular notch on the outer circumference of the top plate 3, and the power wire passes through this hole and is connected to a conductive metal probe on a grooved plate 201 fixed below. The vacuum fitting 303 is connected to a hollow vacuum pumping tube 505 at the cathode electrode 5 to extract electroosmotic contaminated liquid from the cathode electrode 5.

[0028] The electric rotor 4 is fixed to the top of the top plate 3. The top plate has a locking groove that limits the displacement of the cathode electrode 5, allowing the electric rotor 4 to easily rotate the top plate 3 and the entire cathode electrode 5. The rotating rod 501 attached to the cathode electrode 5 stirs the slurry, uniformly mixing the chelating agent and coagulant, and preventing the slurry from hardening too much during wastewater discharge.

[0029] The method of using the electroosmotic remediation apparatus for decontamination and dewatering of waste sludge in this embodiment includes the following steps: S1. The bottom plate 1, anode case 2, and cathode electrode 5 are attached according to the amount of waste sludge to be processed, and connected to the processing device so as to be stably positioned.

[0030] S2. After filling the treatment device with waste sludge, the top plate 3 is placed over it, and at the same time, additives necessary for sludge treatment, such as chelating agents and flocculants, are introduced through the additive injection pipe 302.

[0031] S3. The electric rotor 4 is connected to the apparatus, the detachable locking part between the top plate 3 and the cathode electrode 5 is tightened, the power switch for the electric rotor 4 is turned on, and the rotating rod 501 is driven to agitate the sludge.

[0032] S4. After stirring is complete, the electric rotor 4 is turned off, a DC power supply is supplied to the device to perform electroosmosis treatment, and at the same time the vacuum pump 7 is turned on to start vacuum pumping.

[0033] In S5, after performing electroosmosis treatment every hour, the electric rotor 4 switch is turned on again to agitate the sludge, thereby preventing the slurry from hardening and becoming unable to be discharged into the sludge collection tank 9.

[0034] S6. After 8 hours of electroosmosis, the locking portion of the first sludge-stopping plate 101 on the bottom plate 1 is loosened, and the first sludge-stopping plate and the second sludge-stopping plate are rotated relative to each other. The reduced-volume and detoxified slurry is collected until the amount of electroosmotic wastewater in the vacuum storage tank 6 no longer increases.

[0035] S7. After the electroosmosis is complete, the power is turned off to clean the equipment, and at the same time, the anode case 2 and cathode electrode 5 are removed, inspected, and recycled.

[0036] Multiple electroosmotic anode cases 2 can be installed within the area of ​​the sludge to be treated, and are arranged along the circumference of the grooved plate of the anode case 2 to improve electroosmotic efficiency. The precautions for testing using this method are as follows.

[0037] a. Before using the device, each component must be assembled precisely to prevent misalignment and failure of components when the device rotates.

[0038] b. Appropriate additives must be selected based on the properties of the processed waste sludge slurry, and a dedicated, highly efficient "decontamination and dewatering" treatment must be performed to fully demonstrate the advantages of the one-stage processing of the equipment.

[0039] c. The rotational speed of the electric rotor 4 must be controlled to prevent the rotational rod 501 from breaking due to excessive resistance caused by an excessively high rotational speed. When restarting the electric rotor 4 during the subsequent electroosmosis process, the first vacuum hose 11, the second vacuum hose 10, and the power supply wires must be disconnected to prevent damage during the rotation process.

[0040] d. After each electroosmotic repair, the electrode corrosion status of the anode case 2 and cathode electrode 5 is inspected. If the corrosion is minor, they can be reused; if the corrosion is severe, the electrodes must be replaced.

[0041] e. During electroosmosis, attention must be paid to the amount of water drained from the vacuum storage tank 6 to ensure effective drainage. After electroosmosis, attention must be paid to the pores of the cleaning device, and the filtration geotextile 504 must be replaced in a timely manner to prevent clogging that could affect reuse.

Claims

1. An electroosmotic remediation apparatus for decontamination and dewatering of waste sludge, The system includes a bottom plate (1), an anode case (2), and a top plate (3) connected in order, with an electric rotor (4) provided on the surface of the top plate (3) away from the anode case (2), a cathode electrode (5) provided inside the anode case (2), one end of the cathode electrode (5) protruding outside the top plate (3) and connected to a vacuum water storage tank (6), the vacuum water storage tank (6) connected to a vacuum pump (7), the electric rotor (4) capable of synchronously rotating and stopping the top plate (3) and the cathode electrode (5), both the anode case (2) and the cathode electrode (5) connected to a power supply (8), a sludge collection tank (9) provided on the side of the bottom plate (1) away from the anode case (2), and a plurality of rotating rods (501) and water collection grooves (502) provided on the surface of the cathode electrode (5). The cathode electrode (5) is a hollow, thin-walled, rectangular parallelepiped-shaped iron plate. The rotating rod (501) is a spiral stirring paddle, fixedly connected to a threaded limiting rod (503) on the surface of the cathode electrode (5), and a filtration geotextile (504) is provided on the surface of the water collection groove (502). A vacuum water pump pipe (505) is provided at the end of the cathode electrode (5) near the top plate (3), and the vacuum water pump pipe (505) is connected to a vacuum water storage tank (6) via a first vacuum hose (11). An electroosmotic remediation apparatus for decontamination and dewatering waste sludge, characterized in that the top plate (3) is provided with an anode wire hole (301), an additive injection pipe (302), and a vacuum joint (303), the anode wire hole (301) is used for the passage of a wire, and the vacuum joint (303) can be connected so as to be sealed to a vacuum pumping pipe (505).

2. The electroosmotic remediation apparatus for decontamination and dewatering waste sludge according to claim 1, wherein the bottom plate (1) includes a first sludge-stopping plate (101) and a second sludge-stopping plate (102) that are coaxially rotatable relative to each other, the diameter of the first sludge-stopping plate (101) is smaller than the diameter of the second sludge-stopping plate (102), the edge of the first sludge-stopping plate (101) is provided with a detachable locking portion that is fixed to the second sludge-stopping plate (102), and the second sludge-stopping plate (102) is fixedly connected to the anode case (2).

3. The electroosmotic remediation apparatus for decontamination and dewatering waste sludge according to claim 2, characterized in that the first sludge-stopping plate (101) is provided with a circular hole (103) for discharging sludge and a square notch (104) fixedly connected to the cathode electrode (5), the second sludge-stopping plate (102) is provided with an elliptical hole (105) for discharging sludge, the first sludge-stopping plate (101) and the second sludge-stopping plate (102) are rotatable relative to each other, and when the circular hole (103) and the elliptical hole (105) are aligned, sludge is discharged to the sludge collection tank (9).

4. The electroosmotic remediation apparatus for decontamination and dewatering waste sludge according to claim 1, characterized in that a plurality of groove-shaped plates (201) are provided on the inner wall of the anode case (2) and uniformly distributed at intervals, an anode electrode plate (202) is provided on the groove-shaped plate (201), and the anode electrode plate (202) is connected to an anode wire ring (203) via a metal conductive probe.

5. The electroosmotic remediation apparatus for decontamination and dewatering of waste sludge according to claim 1, characterized in that the vacuum water storage tank (6) is connected to a vacuum pump (7) via a second vacuum hose (10).

6. Step S1 involves assembling the bottom plate (1), anode case (2), and cathode electrode (5), then adding the waste sludge to be processed, placing the top plate (3) on top, and adding the additives necessary for sludge treatment. S2, the steps include connecting the electric rotor (4), tightening the locking part between the top plate (3) and the cathode electrode (5), turning on the power switch for the electric rotor (4), and driving the cathode electrode (5) to agitate the sludge, S3, After stirring is complete, the power switch of the electric rotor (4) is turned off, electroosmosis treatment is performed, the cathode electrode (5), vacuum water storage tank (6), and vacuum pump (7) are connected in order, and the vacuum pump (7) is turned on to start vacuum pumping. S4, After performing electroosmosis treatment every 1-2 hours, disconnect the anode case (2), cathode electrode (5) and power supply (8), disconnect the vacuum fitting (303) and the second vacuum hose (10) and vacuum water storage tank (6), turn the electric rotor (4) on again, and stir the sludge. S5, After electroosmosis for 8 to 10 hours, the step of collecting the reduced-volume and detoxified slurry until the bottom plate (1) shifts relative to it and the amount of electroosmotic wastewater in the vacuum water storage tank (6) no longer increases, A method for using an electroosmotic repair apparatus for decontamination and dewatering waste sludge according to any one of claims 1 to 5, characterized in that S6 includes the step of, after the electroosmosis is completed, the power is turned off and the apparatus is cleaned, and at the same time, the anode case (2) and cathode electrode (5) are removed, inspected, and recycled.

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