Electro-osmosis repairing device for decontamination and dehydration of waste sludge and use method of electro-osmosis repairing device

Abstract

The invention discloses an electroosmosis repairing device for waste sludge decontamination and dehydration and a using method thereof.The electroosmosis repairing device comprises a bottom plate, an anode shell and a top plate which are sequentially connected, an electric rotor is arranged on the surface of the side, away from the anode shell, of the top plate, and a cathode electrode is arranged in the anode shell; one end of the cathode electrode extends out of the top plate and is connected with a vacuum water storage barrel which is connected with a vacuum pump; the anode shell and the cathode electrode are connected with a power supply; a sludge collecting barrel is arranged on one side of the bottom plate away from the anode shell; and a plurality of rotating rods and water collecting grooves are arranged on the surface of the cathode electrode. The use method comprises the following steps: pouring the waste sludge and the additive; the sludge is stirred; closing the electric rotor, carrying out electroosmosis treatment, and pumping water in vacuum; stirring at intervals; collecting the slurry; and power-off cleaning. According to the invention, reduction solidification, harmless treatment and resource recovery in the sludge treatment process are combined into an integrated process, so that the engineering efficiency is greatly improved, and the energy loss is reduced.

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, toxic heavy metals and other types of pollutants. If not handled properly, the pollutants in it will be re-released and diffused, causing secondary pollution. The main way to deal with dredged sludge is to pile it in a storage yard, and dredging projects generally encounter the problem of lack of storage sites. It can be seen that if the waste sludge restoration technology can be constructed and converted into water and soil resources for urban infrastructure, it can not only solve the problem of waste sludge disposal, but also has 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: There are significant differences in the treatment effect of this technology on different types of sludge. Especially when the sludge contains blocky 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 electroosmotic repair device for decontamination and dehydration of waste sludge described in the present invention comprises a bottom plate, an anode shell, and a top plate connected in sequence, an electric rotor is arranged on the surface of the top plate on a side away from the anode shell, a cathode electrode is arranged 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 collecting bucket is arranged on the side of the bottom plate away from the anode shell; a plurality of rotating rods and water collecting grooves are arranged on the surface of the cathode electrode.

[0006] Furthermore, the bottom plate includes a first mudguard baffle and a second mudguard baffle which can rotate coaxially relative to each other, the diameter of the first mudguard baffle is smaller than the diameter of the second mudguard baffle, a detachable buckle is provided at the edge to fix the second mudguard baffle, and the second mudguard baffle is fixedly connected to the anode shell.

[0007] Furthermore, a circular hole for sludge discharge and a square notch 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 arranged on the inner wall of the anode shell, an anode electrode plate is arranged 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 limit rod on the surface of the cathode electrode, and a filtering geotextile is arranged on the surface of the water collecting groove.

[0011] Furthermore, a vacuum water pumping pipe is arranged 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 arranged on the top plate. The anode wire connection hole is passed through by a wire, and the vacuum joint can be sealed and connected with the vacuum 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 waste sludge decontamination and dehydration of the present invention comprises the following steps:

[0015] S1, assemble the bottom plate, anode shell, 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 carry out electroosmosis treatment, connect the cathode electrode, the vacuum water storage bucket, and the vacuum pump in sequence, turn on the vacuum pump to start vacuum pumping;

[0018] S4. After the electroosmosis treatment every 1 to 2 hours, disconnect the anode housing, cathode electrode and power supply, remove the connection between the vacuum joint and the second vacuum hose and the 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 relatively, 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 electro-osmosis is completed, the power is turned off for cleaning, and the anode shell and cathode electrode are dismantled for inspection and recycling.

[0021] Working principle: Electroosmosis is an in-situ remediation technology that uses an external electric field gradient to migrate, separate and remove charged pollutants in the soil. The principle of "decontamination and dehydration" mainly relies on the electrokinetic effects that occur during the process of electrification of the soil: electromigration, electroosmosis, electrophoresis, etc., combined with the adsorption and desorption of heavy metal ions, the complexation and flocculation of chelating agents and flocculants to repair and treat the contaminated waste sludge. In 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; at the same time, the electric disinfection effect and electromigration phenomenon are used to remove harmful microorganisms and heavy metal ions in the sludge, reducing the impact of soil barrier factors. A reduction-harmlessness simultaneous treatment mode is achieved, thereby reducing the disposal cost of waste sludge in the traditional treatment process.

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

[0023] 1. The reduction and solidification, harmless treatment and resource recovery in the sludge treatment process are combined into an integrated process. At the same time, the electro-osmosis vacuum intermittent dehydration scheme is adopted, which greatly improves the engineering efficiency and reduces the 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, promote all-round drainage of the slurry, make the injection of chelating agent and flocculant more uniform, and improve 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 act as electrodes according to the properties of the slurry. The electrodes can be reused when corrosion is small, and the electrodes can be replaced at any time to reduce 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 schematic diagram of the structure of the present invention;

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

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

[0031] Figure 4 is a schematic structural diagram of the cathode electrode 5 of the present invention;

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

[0033] like Figure 1 The anode housing 2 of the electroosmotic repair device for waste sludge decontamination and dehydration is located on the upper part of the rotating bottom plate 1, and the outer edge of the bottom plate 1 is fixedly connected to the anode housing 2. The integrated multifunctional cathode electrode 5 is limitedly fixed in the central groove of the bottom 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 9. 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 housing 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 bottom plate 1 includes a first mud baffle 101 and a second mud baffle 102 which can rotate relative to each other. The diameter of the first mud baffle 101 is smaller than that of the second mud baffle 102. A detachable buckle is provided at the edge of the first mud baffle 101 to fix the second mud baffle 102. The second mud baffle 102 is fixedly connected to the upper anode housing 2 through a limiting device. The first mud baffle 101 is provided with 12 circular holes 103 for sludge discharge, three in a row, and a square notch 104 is provided in the center of the first mud baffle 101 to facilitate fixed rotation with the cathode electrode 5. The second mud baffle 102 is provided with 4 elliptical holes 105 for sludge discharge. A circular groove is provided between the first mud baffle 101 and the second mud baffle 102, and a steel ball is installed inside the groove to enable the two to rotate relative to each other, 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 fixed to the second mud baffle 102 by a limiting device. The grooved plate 201 is fixed by the nut on the side wall of the anode housing 2. The anode electrode plate 202 can be installed in the groove on the surface of the grooved plate, and has a disassembly function. Different numbers of anode electrode plates 202 can be installed depending on the amount of sludge to be treated. A metal conductive probe is inserted into the upper part of the grooved plate, and the metal conductive probe passes through the electrode channel of the top plate 3 and is connected to the anode wire coil 203, and then connected 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, which is fixed on the central groove of the first mud baffle 101. The surface of the cathode electrode 5 is provided with a uniform array of water collection grooves 502, and a vertical vacuum pumping channel is provided in the center. The vacuum pumping pipe 505 is inserted in this vertical channel. The filter geotextile 504 is attached to the surface of the water collection groove 502 to prevent the formation of silt blockage in the drainage channel. The rotating rod 501 is connected to the cylindrical grooves and threaded limit rods 503 distributed in an array on the surface of the cathode electrode 5, and the surface is attached with spiral blades, that is, the rotating rod 501 is a spiral stirring paddle. The cathode electrode 5, the vacuum pumping pipe 505, the filter geotextile 504, and the 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 pipe 302, and a vacuum joint 303. The anode wire connection hole 301 is set in the circular notch on the outer periphery of the top plate 3, and the power supply wire passes through the hole to connect with the conductive metal probe on the fixed groove plate 201 below. The vacuum joint 303 is sealed and connected with the hollow vacuum water extraction pipe 501 of the cathode electrode 5, so that the electroosmotic contaminated liquid is extracted from the cathode electrode 5.

[0038] The electric rotor 4 is fixed to the upper part of the top plate 3, and 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, so as to evenly mix the chelating agent and flocculant, and prevent the slurry from being too drained and solidified and unable to be discharged.

[0039] The method for using the electroosmotic repair device for waste sludge decontamination and dehydration of 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, the 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 at the same time, 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 to make 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 electro-osmosis is completed, the device is powered off and cleaned, and the anode housing 2 and cathode electrode 5 are dismantled for inspection and recycling.

[0047] Multiple electroosmotic anode shells 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 shell 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 rotation speed of the electric rotor 4 should be controlled to prevent the rotation speed from being too fast, causing the rotating rod 501 to encounter excessive resistance and break; when restarting the electric rotor 4 in the subsequent electroosmosis process, the first vacuum hose 9, the second vacuum hose 10, and the power supply wire should be removed to prevent damage during the rotation process.

[0051] d. After each electroosmosis repair, the corrosion of the anode shell 2 and the 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, attention should be paid to the drainage volume of the vacuum water storage tank 6 to ensure effective drainage. After electroosmosis, it is necessary to pay attention to cleaning the small holes in the device and replace the filter geotextile 504 in time to prevent blockage and affect the reuse.

Claims

1. An electroosmotic repair device for waste sludge decontamination and dehydration, characterized in that: The invention comprises a bottom plate (1), an anode shell (2), and a top plate (3) which are connected in sequence; an electric rotor (4) is arranged on the surface of the top plate (3) on a side away from the anode shell (2); a cathode electrode (5) is arranged inside 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); 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 arranged on the side of the bottom plate (1) away from the anode shell (2); and a plurality of rotating rods (501) and water collecting grooves (502) are arranged on the surface of the cathode electrode (5).

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 buckle fixed to the second mud guard baffle (102) being provided at the 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 cathode electrode (5) is a hollow thin-walled rectangular parallelepiped iron plate.

6. The electroosmotic repair device for waste sludge decontamination and dehydration according to claim 1, characterized in that: The rotating rod (501) is a spiral stirring paddle, which is fixedly connected to a threaded limiting rod (503) on the surface of the cathode electrode (5), and a filtering geotextile (504) is arranged on the surface of the water collecting groove (502).

7. The electroosmotic repair device for waste sludge decontamination and dehydration according to claim 1, characterized in that: 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 (9).

8. The electroosmotic repair device for waste sludge decontamination and dehydration according to claim 7, characterized in that: 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).

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

10. A method for using the electroosmotic repair device for waste sludge decontamination and dehydration according to any one of claims 1 to 9, 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 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 carry out electroosmosis treatment, the cathode electrode (5), the vacuum water storage bucket (6), and the vacuum pump (7) are connected in sequence, and the vacuum pump (7) is turned on to start vacuum pumping; S4. After the electroosmosis treatment is performed every 1 to 2 hours, disconnect the anode housing (2), the cathode electrode (5) and the power supply (8), remove the connection between the vacuum joint (303) and the second vacuum hose (10) and the vacuum water storage bucket (6), and turn on the electric rotor (4) again to stir the sludge; S5, after 8 to 10 hours of electroosmosis, the bottom plate (1) is relatively displaced to collect the reduced and harmless slurry until the electroosmotic drainage volume in the vacuum water storage tank (6) stops increasing; S6. After the electro-osmosis is completed, the power is turned off for cleaning, and the anode housing (2) and cathode electrode (5) are dismantled for inspection and recycling.

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