Squeeze electroosmosis combined with vacuum pre-pressing to solidify sludge

Abstract

The present invention provides a method for solidifying sludge by combining extrusion electroosmosis and vacuum preloading, which belongs to the technical field of sludge solidification, and includes: the partition in the solidifying machine contacts and squeezes the sludge under the drive of the power plate. The distance between the power plate and the partition is shortened and the absorbent cotton between the two is squeezed, so that the original liquid in the absorbent cotton is squeezed out and the liquid squeezed out of the sludge is discharged. The power plate is reset upward and the pressure in the space is reduced, and at the same time, the anode net at the bottom of the solidifying machine and the cathode net at the bottom of the partition are connected, so that an electroosmotic electric field is formed between the anode net and the cathode net. Before the partition is separated from the sludge, dual drainage of electroosmosis and vacuum preloading is achieved by reducing the pressure in the space and forming an electric field, and the discharged water is guided by the partition and absorbed by the absorbent cotton in time. The extrusion electroosmosis combined with vacuum preloading sludge solidification method provided by the present invention is highly efficient and has excellent drainage effect, shortens the time required for solidification, and reduces the required cost.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge solidification, and more specifically, relates to a method for solidifying sludge by combining extrusion electroosmosis with vacuum pre-pressing. Background Art

[0002] Since these silts have high water content and compressibility, and low shear strength and permeability, they cannot be used directly in engineering projects. Untreated silt will form a large area of ​​heaps, which will occupy a lot of resources. Therefore, appropriate means are urgently needed to solidify them. The existing drainage consolidation method that combines vacuum preloading method with electroosmosis method performs drainage consolidation under the joint action of vacuum preloading drainage and electroosmosis drainage, and has the dual effects of vacuum preloading and electroosmosis drainage.

[0003] Although the above method can drain the liquid in the sludge to a certain extent, due to the large foundation area required for construction, it is necessary to drain and solidify a very large volume of sludge. Taking vacuum preloading as an example, it is necessary to set up drainage boards, lay sealing membranes and geotextiles on the upper layer, and then use vacuum pumps to extract water and air from the sludge. The entire project requires many components and takes a long time, and the drainage boards set at intervals cannot fully drain the liquid in the sludge, resulting in poor solidification effect. Summary of the invention

[0004] The purpose of the present invention is to provide a method for solidifying sludge by combining extrusion electroosmosis with vacuum pre-pressing, aiming to solve the problem that it takes a long time to discharge the liquid in the sludge and the final solidification effect is poor.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing, comprising:

[0006] A certain amount of sludge is sequentially placed into a plurality of curing machines, and the partitions in the curing machines contact and squeeze the sludge under the drive of the power plate;

[0007] As the power plate continues to move downward, the distance between the power plate and the partition plate shortens and squeezes the absorbent cotton between the two, squeezing out the original liquid in the absorbent cotton and discharging the liquid squeezed out of the sludge;

[0008] After the liquid is discharged, a closed space is formed between the power plate and the curing machine, the power plate is reset upward and the pressure in the space is reduced, and at the same time, the anode net at the bottom of the curing machine and the cathode net at the bottom of the partition are connected to form an electroosmotic electric field between the anode net and the cathode net;

[0009] Before the partition is separated from the sludge, dual drainage of electroosmosis and vacuum preloading is achieved through the reduction of the spatial pressure and the electric field formed, and the discharged water is guided through the partition and absorbed by the absorbent cotton in time.

[0010] In a possible implementation, placing a certain amount of sludge into a plurality of solidification machines in sequence includes:

[0011] A plurality of the solidifying machines are installed and fixed outside the area where the sludge is located, and a certain amount of sludge in the area is transferred to the corresponding solidifying machines one by one and in sequence.

[0012] In a possible implementation, placing a certain amount of sludge into a plurality of solidification machines in sequence further includes:

[0013] The drained sludge is taken out from the solidifying machine, and a reinforcing agent for improving the bearing capacity is added to the surface of the drained sludge.

[0014] In a possible implementation, the adding of a reinforcing agent to the surface of the sludge after drainage to improve the bearing capacity includes:

[0015] The water in the sludge is used to dissolve calcium acetate and urea. After standing for a period of time, microorganisms are sprayed on the sludge surface and then backfilled.

[0016] In a possible implementation, shortening the distance between the power plate and the partition plate and squeezing the absorbent cotton therebetween includes:

[0017] After the partition contacts and squeezes the sludge, as the power plate continues to move downward, the distance between the power plate and the partition is reduced and the absorbent cotton is squeezed, and at the same time, the elastic member between the power plate and the partition is compressed and deformed.

[0018] In a possible implementation, the squeezing out of the original liquid in the absorbent cotton and discharging the liquid squeezed out of the sludge comprises:

[0019] In the process of narrowing the distance between the power plate and the partition plate, the liquid discharged from the absorbent cotton and the liquid generated by squeezing the sludge are discharged through a plurality of one-way valves on the side wall of the curing machine.

[0020] In a possible implementation, after the liquid is discharged, the enclosing of the space between the power plate and the curing machine as a closed space includes:

[0021] The multiple one-way valves on the side wall of the curing machine are closed to make the space airtight.

[0022] In a possible implementation, the power plate is reset upward and the pressure of the space is reduced, including:

[0023] In the process of lowering the pressure in the space by moving upward through the power plate, the partition plate is always in contact with the top surface of the sludge by means of the elastic member;

[0024] With the help of capillary effect, the liquid flows upward through the water-permeable holes on the partition and is absorbed by the absorbent cotton.

[0025] In a possible implementation, the simultaneously connecting the anode net at the bottom of the curing machine and the cathode net at the bottom of the separator includes:

[0026] The cathode mesh is always in contact with the top surface of the sludge, which facilitates the accumulation of liquid;

[0027] When the sludge drainage is completed, the anode network and the cathode network are closed simultaneously, and the power plate drives the cathode network to separate from the sludge.

[0028] In a possible implementation, the step of guiding the discharged water through the partition and allowing the water to be promptly absorbed by the absorbent cotton includes:

[0029] The one-way membrane between the absorbent cotton and the partition plate prevents the liquid from flowing back into the sludge.

[0030] The beneficial effect of the extrusion electroosmosis combined with vacuum preloading sludge solidification method provided by the present invention is that: compared with the prior art, in the extrusion electroosmosis combined with vacuum preloading sludge solidification method of the present invention, a certain amount of sludge is first placed in a plurality of solidification machines in sequence, and the partition in the solidification machine contacts and squeezes the sludge under the drive of the power plate; as the power plate continues to move downward, the distance between the power plate and the partition is shortened and the absorbent cotton between the two is squeezed, the original liquid in the absorbent cotton is squeezed out, and the liquid squeezed out of the sludge is discharged. The power plate is reset upward and the pressure in the space is reduced, and at the same time, the anode net at the bottom of the solidification machine and the cathode net at the bottom of the partition are connected, so that an electroosmosis electric field is formed between the anode net and the cathode net.

[0031] The present invention realizes triple drainage of extrusion, electroosmosis and vacuum preloading by squeezing the sludge, reducing the spatial pressure and forming an electric field, and can guide the discharged water and absorb it in time by the absorbent cotton. More importantly, the curing machine can continuously drain and solidify the sludge, with high efficiency and excellent drainage effect, shortening the time required for curing and reducing the required cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A flow chart of a method for solidifying sludge by combining extrusion electroosmosis with vacuum pre-compression provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] See also Figure 1 The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading provided by the present invention is now described. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading comprises:

[0036] A certain amount of sludge is placed into multiple solidifying machines in turn, and the partitions in the solidifying machines contact and squeeze the sludge under the drive of the power plate.

[0037] As the power plate continues to move downward, the distance between the power plate and the partition is shortened and squeezes the absorbent cotton between the two, squeezing out the original liquid in the absorbent cotton and discharging the liquid squeezed out of the sludge.

[0038] After the liquid is discharged, a closed space is set between the power plate and the curing machine. The power plate is reset upward to reduce the pressure in the space. At the same time, the anode net at the bottom of the curing machine and the cathode net at the bottom of the partition are connected to form an electroosmotic electric field between the anode net and the cathode net.

[0039] Before the partition is separated from the sludge, dual drainage of electroosmosis and vacuum preloading is achieved through the reduction of spatial pressure and the electric field formed, and the discharged water is guided through the partition and absorbed by the absorbent cotton in time.

[0040] The beneficial effect of the extrusion electroosmosis combined with vacuum preloading sludge solidification method provided by the present invention is that: compared with the prior art, in the extrusion electroosmosis combined with vacuum preloading sludge solidification method of the present invention, a certain amount of sludge is first placed in a plurality of solidification machines in sequence, and the partition in the solidification machine contacts and squeezes the sludge under the drive of the power plate; as the power plate continues to move downward, the distance between the power plate and the partition is shortened and the absorbent cotton between the two is squeezed, the original liquid in the absorbent cotton is squeezed out, and the liquid squeezed out of the sludge is discharged. The power plate is reset upward and the pressure in the space is reduced, and at the same time, the anode net at the bottom of the solidification machine and the cathode net at the bottom of the partition are connected, so that an electroosmosis electric field is formed between the anode net and the cathode net.

[0041] The present invention realizes triple drainage of extrusion, electroosmosis and vacuum preloading by squeezing the sludge, reducing the spatial pressure and forming an electric field, and can guide the discharged water and absorb it in time by the absorbent cotton. More importantly, the curing machine can continuously drain and solidify the sludge, with high efficiency and excellent drainage effect, shortening the time required for curing and reducing the required cost.

[0042] Due to the rapid economic development, the flow of people and the amount of construction have increased dramatically, and land resources are becoming increasingly scarce. In order to alleviate this situation, land reclamation projects and the development of underground space have been launched in various parts of the world. In this process, a large amount of silt is inevitably generated. Based on the above situation, many construction methods for treating silt have emerged in the project, including physical methods such as vacuum preloading and heap consolidation, as well as chemical treatment methods such as adding flocculants, curing agents and electroosmosis. However, these methods all have problems that need to be improved.

[0043] The principle of underwater vacuum preloading is similar to that of onshore vacuum preloading. This method is to first set up a vertical conductive drainage board, and then lay a sealing membrane and geotextile on the upper layer to achieve a sealing effect. Then, a vacuum pump is used to generate negative pressure inside and outside the membrane to discharge water and gas from the soil, thereby stabilizing the soil. However, the current underwater vacuum preloading method has the following problems: the laying of underwater vacuum membranes requires high technical requirements, water leakage often occurs, the construction operation is inconvenient, and the construction period is long; the drainage board is easily clogged; the vacuum degree is seriously lost as the depth of the soil layer increases; and the vacuum degree decreases as the water pressure on the membrane increases.

[0044] Electroosmotic consolidation is to generate an electric field by passing electricity through electrodes inserted into the soil. Under the action of the electric field, pore water flows from the anode to the cathode and is discharged from the cathode, thereby achieving a drainage consolidation effect. This method is safe and environmentally friendly; it is not limited by the hydraulic permeability coefficient, has high drainage efficiency, and is particularly advantageous for ultra-fine soft soil; in the treatment of soft soil foundations, it will not cause instability due to insufficient bearing capacity of the soft soil.

[0045] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing provided in the present application, placing a certain amount of sludge into a plurality of solidifying machines in sequence comprises:

[0046] A plurality of solidifying machines are installed and fixed outside the area where the sludge is located, and a certain amount of sludge in the area is transferred to the corresponding solidifying machines one by one and in sequence.

[0047] In the existing methods, although combining electroosmosis with vacuum preloading can reduce the water content of the sludge to a certain extent, it requires more steps and the efficiency is relatively low. At the same time, more equipment is required, so the project cost is high, and it is impossible to achieve the effect of solidifying the sludge at a low cost.

[0048] Because the existing electroosmosis method is to insert metal electrodes into the soil under the action of an electric field and pass direct current, the water in the soil flows from the anode to the cathode, generating electroosmosis, thereby reducing the moisture content or groundwater level of high-clay soil to improve the soil properties. In order to solve the problem of drainage and reinforcement of deep soft soil layers, some scholars have proposed vacuum preloading layered and staged drainage: the first step is to use vacuum preloading to drain and consolidate the shallow layer of about 4-5 meters, and after the shallow layer is treated and reaches a certain strength, it is used as a working platform for the second step of deep soil reinforcement. This foundation treatment method can only be used to reinforce the soft soil foundation after all the filling materials have been blown and the working platform has been formed. The overall treatment cycle is very long and the land development efficiency is low. The drainage rate of electroosmosis reinforcement of soft soil is very fast and is insensitive to the particle size of soft clay. Some scholars have conducted research on drainage in the upper and lower directions of horizontal electrode plate arrangement. However, for deep soft clay, pure electroosmosis reinforcement in the form of horizontal electrode arrangement cannot meet the treatment requirements.

[0049] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing provided in the present application, placing a certain amount of sludge into a plurality of solidifying machines in sequence further comprises:

[0050] The drained sludge is taken out from the solidifying machine, and a reinforcing agent for improving the bearing capacity is added to the surface of the drained sludge.

[0051] The present application aims to provide a low-cost method for quickly solidifying sludge, in which the sludge in the target area needs to be quantitatively transported to a solidifying machine, and the water can be discharged in a relatively short time through methods such as squeezing out water, vacuum preloading and electroosmosis. More importantly, the whole process is fast, efficient and effective, and the water content in the sludge can be collected in a short time. It is mainly suitable for construction occasions with small-area projects and low construction costs.

[0052] Before actual work, relevant personnel are required to install multiple solidification machines within the area. After the solidification machine drains and solidifies a certain volume of silt, it will be discharged, and then a certain volume of silt will be added to the solidification machine in turn through conveyor belts and other means. Through the mutual cooperation of multiple solidification machines, the solidification of silt in a certain cube can be completed.

[0053] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading provided in the present application, a reinforcing agent for improving the bearing capacity is added to the surface of the sludge after drainage is completed, including:

[0054] The water in the sludge is used to dissolve calcium acetate and urea. After standing for a period of time, microorganisms are sprayed on the sludge surface and then backfilled.

[0055] It should be pointed out that the present application requires the gradual solidification of the sludge by multiple solidifying machines. While draining the water in the sludge, the drained sludge needs to be piled up in a centralized manner until the sludge in the area is completely solidified. This process involves the transfer of sludge. Therefore, compared with the traditional solidification method, the solidified sludge in the present application can be briefly dried in the sun to further reduce the moisture content. More importantly, when the sludge is backfilled, a certain reinforcement agent can be added to the solidified sludge, which can be dissolved by the only water in the sludge and can significantly improve the carrying capacity of the sludge.

[0056] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing provided in the present application, shortening the distance between the power plate and the partition plate and squeezing the absorbent cotton therebetween include:

[0057] After the partition contacts and squeezes the sludge, as the power plate continues to move downward, the distance between the power plate and the partition decreases and the absorbent cotton is squeezed, and at the same time, the elastic member between the power plate and the partition is compressed and deformed.

[0058] Microbial geotechnical engineering is a new branch of geotechnical engineering. It mainly uses the chemical reaction of microorganisms to solve the problems in geotechnical engineering and improve the mechanical properties of soil to meet the needs of engineering. Compared with traditional methods, microbial soil reinforcement technology using microbial reaction solidification technology increases the cohesion between soil particles and has the advantages of controllable reaction process, low economic cost and environmental friendliness.

[0059] It should be noted that the reinforcement agent in the present application is a drug or a microorganism. In the embodiment, powdered calcium acetate and urea are mixed into the soil by a dry powder method, covered with an airtight film, and the original moisture of the soil is used to dissolve the calcium acetate and urea. At this time, it is recommended to cover for 24-72 hours to ensure that the calcium acetate and urea are fully dissolved and evenly distributed. When the dissolution is complete and the distribution is even, the bacterial liquid is sprayed onto the surface of the sludge, and then backfilled.

[0060] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing provided in the present application, squeezing out the original liquid in the absorbent cotton and discharging the liquid squeezed out of the sludge at the same time comprises:

[0061] As the distance between the power plate and the partition becomes narrower, the liquid discharged from the absorbent cotton and the liquid produced by squeezing the sludge are discharged through multiple one-way valves on the side wall of the curing machine.

[0062] To explain in more detail, first a certain amount of sludge needs to be placed in the solidifying machine. Since pressurized water discharge, vacuum pre-compression and electro-osmosis are required in the solidifying machine, it is more important that the water needs to be discharged in time in the solidifying machine during these three processes of water discharge and solidification of the sludge. At the same time, sustainability needs to be ensured, that is, the water can be repeatedly absorbed and discharged.

[0063] In order to achieve the above technical effects, in this application, absorbent cotton is arranged in the curing machine, which can quickly absorb water and quickly discharge the water when squeezed. In practical application, absorbent cotton needs to be placed between the partition and the power plate, and an elastic member is arranged between the power plate and the partition.

[0064] The power plate drives the partition and the absorbent cotton to squeeze the sludge. The multiple water-permeable holes on the partition can discharge the moisture in the sludge, and the water discharged from the water-permeable holes can enter the absorbent cotton, thus completing the first water absorption.

[0065] Since the solidification of the sludge is continuous and repeated, the water previously absorbed by the absorbent cotton will be automatically discharged during the process of the power plate and the partition squeezing the absorbent cotton, ensuring that the water in the sludge in the current solidifier can be fully absorbed.

[0066] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing provided in the present application, after the liquid is discharged, the power plate and the solidifying machine are enclosed as a closed space, which includes:

[0067] Close the multiple one-way valves on the side wall of the curing machine to make the space airtight.

[0068] The function of the elastic member is to ensure that the power plate can effectively squeeze the absorbent cotton. In an embodiment, under the action of the power plate, the partition will first contact the sludge. As the power plate continues to move, the elastic member will gradually increase the squeezing force on the sludge. At this time, the moisture in the sludge will be absorbed by the absorbent cotton through the water-permeable holes opened on the partition. Therefore, the purpose of setting the elastic member is to change the gap between the power plate and the partition with the cooperation of the sludge, so as to automatically complete the squeezing of the absorbent cotton.

[0069] Squeezing the absorbent cotton can discharge the water absorbed by it before, and provide space for absorbing water again. For this reason, a plurality of water holes are also provided on the power plate, and the water discharged from the water holes can be quickly discharged from the curing machine.

[0070] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing provided in the present application, resetting the power plate upward and reducing the pressure in the space includes:

[0071] In the process of moving upward through the power plate to reduce the space pressure, the partition is always in contact with the top surface of the sludge with the help of the elastic member;

[0072] With the help of capillary effect, the liquid flows upward through the permeable holes on the partition and is absorbed by the absorbent cotton.

[0073] After the power plate drives the baffle to squeeze the sludge and discharge a certain amount of water, the baffle needs to be kept still for a while in the current position to ensure that more water can be squeezed out for the first time. It should be pointed out that the baffle is not made of metal material, and there are many pores inside the baffle. In the process of the baffle squeezing the sludge, water will enter the absorbent cotton through the pores, that is, the water-permeable holes, and be absorbed by the absorbent cotton. Because there are pores inside the baffle for water flow, the effective discharge of water is ensured.

[0074] After the partition squeezes the sludge for a period of time, vacuum preloading and electroosmosis are required. It should be noted that these two methods are carried out at the same time, and the sealing of the curing machine needs to be ensured. In an embodiment, multiple one-way valves are installed on the side wall of the curing machine. The one-way valves can be used to discharge water and air, but cannot be conducted from the other direction.

[0075] In actual operation, the power plate is reset, and the pressure inside the curing machine is gradually reduced due to the reset of the power plate. While the pressure inside the curing machine is reduced, the partition and the electrodes at the bottom of the curing machine are turned on to form an electric field to complete the electroosmosis operation.

[0076] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing provided in the present application, simultaneously connecting the anode net at the bottom of the solidifying machine and the cathode net at the bottom of the separator comprises:

[0077] The cathode screen is always in contact with the top surface of the sludge, facilitating the accumulation of liquid;

[0078] When the sludge drainage is completed, the anode network and the cathode network are closed at the same time, and the power plate drives the cathode network to separate from the sludge.

[0079] The electroosmosis method inserts geosynthetic electrodes into the foundation soil and passes direct current. Under the action of the electric field, the water in the soil flows from the anode to the cathode and is discharged at the cathode, thereby reducing the moisture content of the high-clay soil and improving the strength of the foundation soil. Although this method solves the problem of easy corrosion of metal electrodes, it is still difficult to avoid problems such as large power and electrode consumption. At the same time, the bubbles that escape during the electroosmosis process affect the reinforcement effect.

[0080] In order to solve this problem and reduce energy consumption at the same time, a more detailed description is given. An anode electrode mesh is arranged at the bottom of the curing machine, and a cathode electrode mesh is arranged on the bottom surface of the partition. During the resetting process of the power plate, the pressure in the curing machine is reduced to allow water to flow out of the sludge. At this time, an electric field is formed between the anode and the cathode, so that water can flow to the cathode at the top. Therefore, the present application integrates electroosmosis and vacuum preloading, and the effect is better than a traditional method, because the water flows faster under the joint action of the two methods, and the final sludge solidification effect is better.

[0081] In some embodiments of the method for solidifying sludge by extrusion electroosmosis combined with vacuum pre-pressing provided in the present application, the discharged water is guided through the partition and absorbed by the absorbent cotton in time, including:

[0082] The one-way membrane between the absorbent cotton and the partition prevents the liquid from flowing back into the sludge.

[0083] To explain in more detail, first, a cathode net is set under the partition. During the upward reset of the power plate, a closed space will be formed between the power plate and the inside of the curing machine. As the power plate continues to move upward, the pressure in the space will gradually decrease, and a vacuum will be formed under extreme conditions. It should be pointed out that since there is an elastic member between the partition and the power plate, and since the elastic member is under pressure during the reset of the power plate, the partition is always in contact with the top of the sludge under the action of the elastic member during the upward movement of the power plate, which makes the water discharged through vacuum preloading and electroosmosis pass through the partition and finally enter the absorbent cotton. This is done by the capillary effect of the partition and the absorbent cotton itself. In order to ensure the vacuum, it is necessary to quickly change the opening of multiple one-way valves on the curing machine according to the position of the power plate.

[0084] Through the above design, the water in the sludge can be discharged in time, and with the help of vacuum preloading and electroosmosis, the water can be discharged quickly with better effect.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for solidifying sludge by combining extrusion electroosmosis with vacuum preloading, characterized in that: include: A certain amount of sludge is sequentially placed into a plurality of curing machines, and the partitions in the curing machines contact and squeeze the sludge under the drive of the power plate; As the power plate continues to move downward, the distance between the power plate and the partition plate shortens and squeezes the absorbent cotton between the two, squeezing out the original liquid in the absorbent cotton and discharging the liquid squeezed out of the sludge; After the liquid is discharged, a closed space is formed between the power plate and the curing machine, the power plate is reset upward and the pressure in the space is reduced, and at the same time, the anode net at the bottom of the curing machine and the cathode net at the bottom of the partition are connected to form an electroosmotic electric field between the anode net and the cathode net; Before the partition is separated from the sludge, dual drainage of electroosmosis and vacuum preloading is achieved through the reduction of the spatial pressure and the electric field formed, and the discharged water is guided through the partition and absorbed by the absorbent cotton in time.

2. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 1, characterized in that: Placing a certain amount of sludge into a plurality of solidifying machines in sequence comprises: A plurality of the solidifying machines are installed and fixed outside the area where the sludge is located, and a certain amount of sludge in the area is transferred to the corresponding solidifying machines one by one and in sequence.

3. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 1, characterized in that: Placing a certain amount of sludge into a plurality of solidifying machines in sequence also includes: The drained sludge is taken out from the solidifying machine, and a reinforcing agent for improving the bearing capacity is added to the surface of the drained sludge.

4. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 3, characterized in that: The reinforcing agent added to the sludge surface after drainage to improve the bearing capacity includes: The water in the sludge is used to dissolve calcium acetate and urea. After standing for a period of time, microorganisms are sprayed on the sludge surface and then backfilled.

5. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 1, characterized in that: The distance between the power plate and the partition is shortened and the water-absorbing cotton between the power plate and the partition is squeezed, which includes: After the partition contacts and squeezes the sludge, as the power plate continues to move downward, the distance between the power plate and the partition is reduced and the absorbent cotton is squeezed, and at the same time, the elastic member between the power plate and the partition is compressed and deformed.

6. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 5, characterized in that: The squeezing out of the original liquid in the absorbent cotton and discharging the liquid squeezed out of the sludge comprises: In the process of narrowing the distance between the power plate and the partition plate, the liquid discharged from the absorbent cotton and the liquid generated by squeezing the sludge are discharged through a plurality of one-way valves on the side wall of the curing machine.

7. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 6, characterized in that: The method of setting a closed space between the power plate and the curing machine after the liquid is discharged comprises: The multiple one-way valves on the side wall of the curing machine are closed to make the space airtight.

8. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 5, characterized in that: The power plate is reset upward and the pressure of the space is reduced, comprising: In the process of lowering the pressure in the space by moving upward through the power plate, the partition plate is always in contact with the top surface of the sludge by means of the elastic member; With the help of capillary effect, the liquid flows upward through the water-permeable holes on the partition and is absorbed by the absorbent cotton.

9. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 1, characterized in that: The method of simultaneously connecting the anode net at the bottom of the curing machine and the cathode net at the bottom of the separator comprises: The cathode mesh is always in contact with the top surface of the sludge, which facilitates the accumulation of liquid; When the sludge drainage is completed, the anode network and the cathode network are closed simultaneously, and the power plate drives the cathode network to separate from the sludge.

10. The method for solidifying sludge by extrusion electroosmosis combined with vacuum preloading as claimed in claim 1, characterized in that: The step of guiding the discharged water through the partition and allowing the water to be absorbed by the absorbent cotton in a timely manner includes: The one-way membrane between the absorbent cotton and the partition plate prevents the liquid from flowing back into the sludge.

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