Sludge treatment mechanism based on high-salinity wastewater pretreatment system

Abstract

The invention discloses a sludge treatment mechanism based on a high-salinity wastewater pretreatment system. The sludge treatment mechanism comprises a sludge circulating pipeline, a sludge discharge pipeline, a sludge circulating pump, a sludge storage tank, a sludge discharge pump and a sludge feeding pump. And the sludge circulating pump is arranged on the sludge circulating pipeline. The sludge discharge pump is arranged on the sludge discharge pipeline and is used for driving the sludge to be conveyed to the sludge storage tank. The sludge feeding pump is used for discharging sludge in the sludge storage tank. Sludge in the sedimentation grids is discharged for storage and dehydration through the sludge discharge pipeline, a sludge circulation loop is formed through the sludge circulation pipeline, and water-containing sludge is beaten back to the front end of the coagulative precipitation tank for circulation treatment, so that the concentration of the sludge in the coagulative precipitation tank is continuously increased, and the sludge concentration in the coagulative precipitation tank is increased. Calcium and magnesium ions in the sewage are promoted to react with the added medicament to form precipitates, so that impurity ions can form precipitates, and the quality of produced water is ensured. In addition, the sludge concentration in the water-containing sludge discharged from the precipitation grid is higher, and the operation of the sludge dewatering machine at the rear end is also facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a sludge treatment mechanism based on a high-salinity wastewater pretreatment system. Background Art

[0002] In the wastewater pretreatment system, the treatment and recycling of sludge is a key link to improve system efficiency and reduce operating costs. As an important part connecting various wastewater treatment units, the design and operation status of the sludge circulation pipeline directly affect the treatment effect of the entire system. However, when the sludge concentration in the coagulation sedimentation tank is low, there are fewer precipitation coagulation nuclei, which is not conducive to the formation of precipitation after the calcium and magnesium ions and other impurity ions in the sewage react with the added reagents. In addition, when the sludge concentration in the muddy wastewater in the sludge hopper is low, it is also not conducive to the operation of the back-end sludge dewatering machine.

[0003] In view of this, it is necessary to provide a sludge treatment mechanism based on a high-salinity wastewater pretreatment system to overcome the above-mentioned defects. Summary of the invention

[0004] The purpose of the present invention is to provide a sludge treatment mechanism based on a high-salt wastewater pretreatment system, aiming to improve the problem of unreasonable sludge discharge pipeline design so that the sludge concentration in the coagulation sedimentation tank can be maintained within the most appropriate range.

[0005] In order to achieve the above object, the present invention provides a sludge treatment mechanism based on a high-salinity wastewater pretreatment system, which is used to treat the sludge product of a coagulation sedimentation tank, comprising:

[0006] A sludge hopper bottom outlet pipeline connected to the end of the coagulation sedimentation tank and a sludge circulation pipeline into the coagulation sedimentation tank connected to the front end of the coagulation sedimentation tank;

[0007] A sludge circulation pipeline, the two ends of which are respectively connected to the outlet pipeline at the bottom of the sludge hopper and the pipeline for sludge circulation into the coagulation sedimentation tank to form a sludge circulation loop;

[0008] A sludge circulation pump, which is arranged on the sludge circulation pipeline and is used to drive the sludge-containing wastewater in the sludge circulation pipeline to return from the end of the coagulation sedimentation tank to the front end, so as to increase the sludge concentration in the coagulation sedimentation tank;

[0009] A mud discharge pipeline, one end of which is connected to the outlet pipeline at the bottom of the mud hopper;

[0010] A sludge storage tank, the sludge storage tank is connected to one end of the sludge discharge pipeline away from the outlet pipeline at the bottom of the sludge hopper;

[0011] A sludge pump, which is arranged on the sludge discharge pipeline and is used to drive the sludge in the sludge discharge pipeline to be transported to the sludge storage tank;

[0012] A sludge feeding pump is used to discharge the sludge in the sludge storage tank.

[0013] In a preferred embodiment, the mechanism further comprises:

[0014] A vortex air pump is connected to an aeration pipe, and one end of the aeration pipe away from the vortex air pump extends into the bottom of the sludge storage tank; the vortex air pump is used to aerate and stir the sludge storage tank through the aeration pipe to ensure that the sludge concentration at each point in the sludge storage tank is uniform.

[0015] In a preferred embodiment, the mud discharge pipeline includes a mud discharge main line and a first branch of a mud discharge pump outlet and a second branch of a mud discharge pump outlet respectively connected to the ends of the mud discharge main line; the mud discharge pump is arranged on the mud discharge main line, the first branch of the mud discharge pump outlet is provided with a first branch control valve of the mud discharge pump outlet, and the second branch of the mud discharge pump outlet is provided with a second branch control valve of the mud discharge pump outlet and a magnetic powder recovery mechanism.

[0016] In a preferred embodiment, the magnetic powder recovery mechanism includes a sludge shearing machine and a magnetic powder recovery machine. The sludge shearing machine is used to shear and deflocculate the sludge, and the magnetic powder recovery machine is used to recover the magnetic powder in the sludge after shearing and deflocculation, and allow the recovered magnetic powder to fall into the coagulation sedimentation tank by gravity for reuse.

[0017] In a preferred embodiment, the mud discharge pipeline is connected with a mud discharge bypass at the front end of the mud discharge pump and the end of the sludge storage tank, and the mud discharge bypass is provided with a mud discharge bypass valve; the mud discharge bypass is used to discharge the sludge in the mud discharge pipeline directly through the sludge feeding pump without passing through the mud discharge pump.

[0018] In a preferred embodiment, the sludge circulation pipeline is provided with a sludge circulation pump bypass at both ends of the sludge circulation pump, and the sludge circulation pump bypass is provided with a sludge circulation pump bypass valve.

[0019] In a preferred embodiment, the mud discharge pipeline is provided with a mud discharge pump bypass at both ends of the mud discharge pump, and the mud discharge pump bypass is provided with a mud discharge pump bypass valve.

[0020] In a preferred embodiment, the rear end of the sludge discharge main line is connected to a sludge circulation and sludge discharge pipeline connecting branch, and the end of the sludge circulation and sludge discharge pipeline connecting branch away from the sludge discharge main line is connected to the sludge circulation into the coagulation sedimentation tank pipeline; the sludge circulation and sludge discharge pipeline connecting branch is provided with a sludge circulation and sludge discharge pipeline connecting branch control valve; the rated flow of the sludge discharge pump is greater than the rated flow of the sludge circulation pump; when the sludge circulation pump stops running due to special circumstances, part of the sludge transported by the sludge discharge pump enters the end of the sludge discharge main line, and the other part of the sludge passes through the open sludge circulation and sludge discharge pipeline connecting branch control valve and passes through the sludge circulation and sludge discharge pipeline connecting branch and the second pipeline in sequence to enter the coagulation sedimentation tank.

[0021] In a preferred embodiment, the coagulation sedimentation tank includes a first reaction cell, a second reaction cell, a magnetic powder loading cell, a coagulation cell, a flocculation cell and a sedimentation cell through which the wastewater flows in sequence. A sludge hopper is provided at the bottom of the sedimentation cell, and the outlet pipe at the bottom of the sludge hopper is connected to the sludge hopper; the sludge circulates into the coagulation sedimentation tank pipe and is connected to the first reaction cell and the coagulation cell at the same time.

[0022] The sludge treatment mechanism based on the high-salt wastewater pretreatment system provided by the present invention discharges the sludge in the sedimentation grid through the sludge discharge pipeline for storage and dehydration, and forms a sludge circulation loop through the sludge circulation pipeline to return the water-containing sludge to the front end of the coagulation sedimentation tank for circulation treatment, so as to continuously improve the sludge concentration in the coagulation sedimentation tank, promote the calcium and magnesium ions in the sewage to react with the added agent to form precipitation, and facilitate the formation of precipitation of impurity ions to ensure the water quality of the produced water. In addition, the sludge concentration in the water-containing sludge discharged from the sedimentation grid is higher, which is also conducive to the operation of the rear-end sludge dewatering machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a piping schematic diagram of the sludge treatment mechanism based on the high-salinity wastewater pretreatment system.

[0025] Numbers in the figure: 100, sludge treatment mechanism based on high-salt wastewater pretreatment system; 200, coagulation sedimentation tank; 201, first reaction grid; 202, second reaction grid; 203, magnetic powder loading grid; 204, coagulation grid; 205, flocculation grid; 206, sedimentation grid; 207, sludge hopper;

[0026] 1. The outlet pipeline at the bottom of the sludge hopper; 2. The pipeline for sludge circulation into the coagulation sedimentation tank;

[0027] 10. Sludge circulation pipeline; 11. Sludge circulation pump bypass; 12. Sludge circulation pump bypass valve;

[0028] 20. Mud discharge pipeline; 21. Branch connecting sludge circulation and mud discharge pipeline; 211. Control valve of branch connecting sludge circulation and mud discharge pipeline; 22. Mud discharge pump bypass; 23. Mud discharge pump bypass valve; 24. Mud discharge main line; 25. First branch of mud discharge pump outlet; 251. Control valve of first branch of mud discharge pump outlet; 26. Second branch of mud discharge pump outlet; 261. Control valve of second branch of mud discharge pump outlet; 262. Mud shearing machine; 263. Magnetic powder recovery machine; 27. Mud discharge bypass; 271. Mud discharge bypass valve; 30. Mud circulation pump; 40. Mud storage tank; 50. Mud discharge pump; 60. Mud feeding pump; 70. Vortex air pump; 71. Aeration pipe. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the present invention, not for limiting the present invention.

[0030] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0031] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0032] In an embodiment of the present invention, a sludge treatment mechanism 100 based on a high-salinity wastewater pretreatment system is provided, which is used to treat sludge products in a coagulation sedimentation tank 200. The front end of the coagulation sedimentation tank 200 is a water inlet end, and the end is a sedimentation grid. The inclined tube in the sedimentation grid performs preliminary separation of mud and water, and this mechanism is mainly responsible for treating the water-containing sludge at the bottom of the inclined tube.

[0033] In an exemplary embodiment, Figure 1As shown, the coagulation sedimentation tank 200 includes a first reaction cell 201, a second reaction cell 202, a magnetic powder loading cell 203, a coagulation cell 204, a flocculation cell 205 and a sedimentation cell 206 through which wastewater flows in sequence, and a sludge hopper 207 is provided at the bottom of the sedimentation cell 206. The first reaction cell 201 and the second reaction cell 202 are used to make the impurity ions in the wastewater react with the added reagent to generate solid precipitation particles; the coagulation cell 204 and the flocculation cell 205 are used to flocculate these solid precipitation particles into floccules, and further form obvious precipitates, which eventually form water-containing sludge in the sedimentation cell 206 through mechanisms such as inclined plates. The water-containing sludge is precipitated in the sludge hopper 207.

[0034] like Figure 1 As shown, the sludge treatment mechanism 100 based on the high-salt wastewater pretreatment system includes: a sludge hopper bottom outlet pipeline 1 connected to the end of the coagulation sedimentation tank 200 and a sludge circulation pipeline 2 for entering the coagulation sedimentation tank connected to the front end of the coagulation sedimentation tank 200, a sludge circulation pipeline 10, a sludge discharge pipeline 20, a sludge circulation pump 30, a sludge storage tank 40, a sludge discharge pump 50, and a sludge feeding pump 60.

[0035] In this embodiment, the two ends of the sludge circulation pipeline 10 are respectively connected to the sludge hopper bottom outlet pipeline 1 and the sludge circulation into the coagulation sedimentation tank pipeline 2 to form a sludge circulation loop. Specifically, one end of the sludge circulation pipeline 10 is connected to the sludge hopper 207 through the sludge hopper bottom outlet pipeline 1, and the other end is connected to the first reaction cell 201 and the coagulation cell 204 through the sludge circulation into the coagulation sedimentation tank pipeline 2 (wherein, according to the sludge concentration and chemical reaction conditions, the valve switching can be used to select which one to return to or to return to the first reaction cell 201 and the coagulation cell 204 at the same time). The sludge circulation pump 30 is arranged on the sludge circulation pipeline 10, and is used to drive the sludge-containing wastewater in the sludge circulation pipeline 10 from the end of the coagulation sedimentation tank 200 (through the sludge hopper bottom outlet pipeline 1) back to the front end (through the sludge circulation into the coagulation sedimentation tank pipeline 2), so that the water-containing sludge can be returned to the front end of the coagulation sedimentation tank 200 for circulation treatment, so as to continuously increase the sludge concentration in the sedimentation grid 206 (of course, the higher the sludge concentration, the better, and too high a concentration is easy to block the pipe, so the sludge discharge pipeline 20 needs to be discharged in time to keep the sludge concentration of the entire structure within an appropriate range), and provide a large number of condensation nuclei required for precipitation in the coagulation sedimentation tank 200 (similar to the role of "seed crystals"), promote the reaction of calcium and magnesium ions in the sewage with the added agent to form precipitation, which is beneficial to the precipitation of impurity ions and ensures the water quality of the produced water.

[0036] Furthermore, sludge circulation pipelines 10 are provided with a sludge circulation pump bypass 11 at both ends of the sludge circulation pump 30, that is, the sludge circulation pump bypass 11 is arranged in parallel with the sludge circulation pump 30. The sludge circulation pump bypass 11 is provided with a sludge circulation pump bypass valve 12, so that a pump return pipeline can be formed between the sludge circulation pump bypass 11 and the sludge circulation pump 30. Therefore, the sludge circulation pump 30 can be shunted through the sludge circulation pump bypass 11, that is, the sludge circulation pump 30 can operate at the rated flow rate. Most of the water-containing sludge is transported into the coagulation sedimentation tank 200 through the sludge circulation pipeline 10, and another small part of the water-containing sludge flows back to the front end of the sludge circulation pipeline 10 through the sludge circulation pump bypass 11, thus preventing the sludge circulation pump 30 from operating under pressure to ensure that the outlet flow rate matches the actual sludge volume of the system.

[0037] One end of the sludge discharge pipeline 20 is connected to the bottom outlet pipeline 1 of the sludge hopper. Furthermore, the sludge discharge pipeline 20 is connected to a sludge circulation and sludge discharge pipeline connection branch 21. The end of the sludge circulation and sludge discharge pipeline connection branch 21 far from the sludge discharge pipeline 20 is connected to the sludge circulation inlet coagulation sedimentation tank pipeline 2. The sludge circulation and sludge discharge pipeline connection branch 21 is provided with a sludge circulation and sludge discharge pipeline connection branch control valve 211. Among them, the rated flow rate of the sludge discharge pump 50 is greater than the rated flow rate of the sludge circulation pump 30. When the sludge circulation pump 30 stops operating (for example, in case of a fault or maintenance), part of the sludge transported by the sludge discharge pump 50 enters the sludge discharge pipeline 20 to achieve sludge discharge; another part of the sludge passes through the opened sludge circulation and sludge discharge pipeline connection branch control valve 211 and enters the coagulation sedimentation tank 200 through the sludge circulation and sludge discharge pipeline connection branch 21 and the end of the sludge circulation pipeline 10 in sequence, playing a role of substitution and supplement. At this time, the sludge discharge pump 50 simultaneously meets the requirements of sludge discharge and sludge reflux circulation.

[0038] Among them, the sludge circulation and sludge discharge pipeline connection branch control valve 211 is normally closed during normal operation and is opened when the sludge circulation pump stops operating due to special circumstances, so as to achieve the purpose of the sludge discharge pump 50 substituting for the sludge circulation pump 30.

[0039] In this embodiment, the sludge storage tank 40 is connected to the end of the sludge discharge pipeline 20 far from the bottom outlet pipeline 1 of the sludge hopper for temporarily storing sludge. Among them, the sludge discharge pump 50 is arranged on the sludge discharge pipeline 20 for driving the sludge in the sludge discharge pipeline 20 to be transported to the sludge storage tank 40.

[0040] Furthermore, the mechanism further includes a vortex air pump 70. The vortex air pump 70 is connected to an aeration pipe 71. One end of the aeration pipe 71 away from the vortex air pump 70 extends into the bottom of the sludge storage tank 40. The vortex air pump 70 is used to aerate and stir the sludge storage tank 40 through the aeration pipe 71 to ensure that the sludge concentration at each point in the sludge storage tank 40 is uniform, to avoid sludge settling in the sludge storage tank 40, and then the sludge concentration at the bottom is too high, resulting in blockage of the subsequent conveying pipe.

[0041] Furthermore, the mud discharge pipeline 20 is provided with a mud discharge pump bypass 22 at both ends of the mud discharge pump 50, that is, the mud discharge pump bypass 22 is arranged in parallel with the mud discharge pump. The mud discharge pump bypass 22 is provided with a mud discharge pump bypass valve 23, so that a pump return pipeline can be formed between the mud discharge pump bypass 22 and the mud discharge pump 50. Therefore, the mud discharge pump 50 can be diverted through the mud discharge pump bypass 22, that is, the mud discharge pump 50 can be operated at a rated flow rate, most of the sludge is transported to the sludge storage tank 40 through the mud discharge pipeline 20, and another small part of the sludge is returned to the front end of the mud discharge pipeline 20 through the mud discharge pump bypass 22, thereby avoiding the mud discharge pump 50 from being in a pressure-holding operation state due to ensuring that the outlet flow rate matches the actual sludge amount of the system.

[0042] Specifically, the mud discharge pipeline 20 includes a mud discharge main line 24 and a first branch 25 and a second branch 26 of a mud discharge pump outlet respectively connected to the ends of the mud discharge main line 24. The mud discharge pump 50 is arranged on the mud discharge main line 24. The first branch 25 of the mud discharge pump outlet is provided with a first branch control valve 251 of the mud discharge pump outlet, and the second branch 26 of the mud discharge pump outlet is provided with a second branch control valve 261 of the mud discharge pump outlet and a magnetic powder recovery mechanism. That is, for sludge mixed with magnetic powder (alum flower precipitation sludge), the sludge in the mud discharge pipeline 20 is controlled by switching the valve to pass through the second branch 26 of the mud discharge pump outlet to recover the magnetic powder; and for sludge without magnetic powder or when the magnetic powder does not need to be recovered, it can directly pass through the first branch 25 of the mud discharge pump outlet.

[0043] The magnetic powder recovery mechanism includes a sludge shearing machine 262 and a magnetic powder recovery machine 263. The sludge shearing machine 262 is used to shear and deflocculate the sludge, and the magnetic powder recovery machine 263 is used to recover the magnetic powder in the sludge after shearing and deflocculation, and make the recovered magnetic powder fall into the coagulation sedimentation tank 200 by gravity for reuse.

[0044] It should be noted that the purpose of adding magnetic powder is to improve the flocculation effect of the precipitation formed after the impurity ions react with the added reagents. Therefore, according to the precipitation flocculation effect, it can be selected whether to use magnetic powder and magnetic powder recovery equipment, that is, if the precipitation flocculation effect itself can meet the requirements, it is not necessary to invest in magnetic powder and magnetic powder recovery equipment, otherwise it is necessary to invest. The sludge shearing machine 262 and the magnetic powder recovery machine 263 are located at the top of the magnetic powder loading grid 203, so that the magnetic powder in the magnetic powder loading grid 203 can enter the predetermined position of the coagulation sedimentation tank 200 due to its own weight. Among them, the entire pretreatment device adds a sufficient amount of magnetic powder at the start, and the magnetic powder alum flower sludge formed by flocculation is deflocculated by the sludge shearing machine 262 to separate the magnetic powder and sludge, and then the magnetic powder is recovered by the magnetic powder recovery machine 263. In addition, due to the loss in the recovery process, the magnetic powder can be regularly replenished to the magnetic powder loading grid 203.

[0045] In the embodiment of the present invention, the sludge feed pump 60 is used to discharge the sludge in the sludge storage tank 40, for example, to discharge it into the screw press sludge dehydrator for dehydration to obtain dehydrated sludge with a moisture content of less than 80%, and the filtrate is returned to the coagulation sedimentation tank for circulation treatment. If the sludge shearing machine 262 and the magnetic powder recovery machine 263 are not put into operation, the sludge is directly discharged into the sludge storage tank 40 by the sludge discharge pump 50 and then directly pumped into the screw press sludge dehydrator for dehydration through the sludge feed pump 60.

[0046] In one embodiment, the mud discharge pipeline 20 is connected with a mud discharge bypass 27 at the front end of the mud discharge pump 50 and the end of the sludge storage tank 40. The mud discharge bypass 27 is provided with a mud discharge bypass valve 271, so that the sludge in the mud discharge pipeline 20 can be discharged directly through the sludge feeding pump 60 without passing through the mud discharge pump 50.

[0047] In summary, the sludge treatment mechanism 100 based on the high-salt wastewater pretreatment system provided by the present invention discharges the sludge in the sedimentation grid 206 for storage and dehydration through the sludge discharge pipeline 20, and forms a sludge circulation loop through the sludge circulation pipeline 10, and returns the water-containing sludge to the front end of the coagulation sedimentation tank 200 for circulation treatment, so as to continuously improve the sludge concentration in the coagulation sedimentation tank 200, promote the calcium and magnesium ions in the sewage to react with the added agent to form precipitation, and facilitate the formation of precipitation of impurity ions to ensure the water quality of the produced water. In addition, the sludge concentration in the water-containing sludge discharged from the sedimentation grid 206 is higher, which is also conducive to the operation of the rear-end sludge dewatering machine.

[0048] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrative examples shown and described herein.

Claims

1. A sludge treatment mechanism based on a high-salinity wastewater pretreatment system, used to treat sludge products from a coagulation sedimentation tank, characterized in that: include: A sludge hopper bottom outlet pipeline connected to the end of the coagulation sedimentation tank and a sludge circulation pipeline into the coagulation sedimentation tank connected to the front end of the coagulation sedimentation tank; A sludge circulation pipeline, the two ends of which are respectively connected to the outlet pipeline at the bottom of the sludge hopper and the pipeline for sludge circulation into the coagulation sedimentation tank to form a sludge circulation loop; A sludge circulation pump, which is arranged on the sludge circulation pipeline and is used to drive the sludge-containing wastewater in the sludge circulation pipeline to return from the end of the coagulation sedimentation tank to the front end, so as to increase the sludge concentration in the coagulation sedimentation tank; A mud discharge pipeline, one end of which is connected to the outlet pipeline at the bottom of the mud hopper; A sludge storage tank, the sludge storage tank is connected to one end of the sludge discharge pipeline away from the outlet pipeline at the bottom of the sludge hopper; A sludge pump, which is arranged on the sludge discharge pipeline and is used to drive the sludge in the sludge discharge pipeline to be transported to the sludge storage tank; A sludge feeding pump is used to discharge the sludge in the sludge storage tank.

2. The sludge treatment mechanism based on the high-salinity wastewater pretreatment system according to claim 1, characterized in that: Also includes: A vortex air pump is connected to an aeration pipe, and one end of the aeration pipe away from the vortex air pump extends into the bottom of the sludge storage tank; the vortex air pump is used to aerate and stir the sludge storage tank through the aeration pipe to ensure that the sludge concentration at each point in the sludge storage tank is uniform.

3. The sludge treatment mechanism based on the high-salinity wastewater pretreatment system according to claim 1, characterized in that: The mud discharge pipeline includes a mud discharge main line and a first branch of a mud discharge pump outlet and a second branch of a mud discharge pump outlet respectively connected to the ends of the mud discharge main line; the mud discharge pump is arranged on the mud discharge main line, the first branch of the mud discharge pump outlet is provided with a first branch control valve of the mud discharge pump outlet, and the second branch of the mud discharge pump outlet is provided with a second branch control valve of the mud discharge pump outlet and a magnetic powder recovery mechanism.

4. The sludge treatment mechanism based on the high-salinity wastewater pretreatment system according to claim 3 is characterized in that: The magnetic powder recovery mechanism includes a sludge shearing machine and a magnetic powder recovery machine. The sludge shearing machine is used to shear and deflocculate the sludge, and the magnetic powder recovery machine is used to recover the magnetic powder in the sludge after shearing and deflocculation, so that the recovered magnetic powder falls into the coagulation sedimentation tank by gravity for reuse.

5. The sludge treatment mechanism based on the high-salinity wastewater pretreatment system according to claim 3 is characterized in that: The mud discharge pipeline is connected with a mud discharge bypass at the front end of the mud discharge pump and the end of the sludge storage tank, and the mud discharge bypass is provided with a mud discharge bypass valve; the mud discharge bypass is used to discharge the sludge in the mud discharge pipeline directly through the sludge feeding pump without passing through the mud discharge pump.

6. The sludge treatment mechanism based on the high-salinity wastewater pretreatment system according to claim 1, characterized in that: The sludge circulation pipeline is provided with a sludge circulation pump bypass at both ends of the sludge circulation pump, and the sludge circulation pump bypass is provided with a sludge circulation pump bypass valve.

7. The sludge treatment mechanism based on the high-salinity wastewater pretreatment system according to claim 1, characterized in that: The mud discharge pipeline is provided with a mud discharge pump bypass at both ends of the mud discharge pump, and the mud discharge pump bypass is provided with a mud discharge pump bypass valve.

8. The sludge treatment mechanism based on the high-salinity wastewater pretreatment system according to claim 3, characterized in that: The rear end of the sludge discharge main line is connected with a sludge circulation and sludge discharge pipeline connecting branch, and the end of the sludge circulation and sludge discharge pipeline connecting branch away from the sludge discharge main line is connected to the sludge circulation into the coagulation sedimentation tank pipeline; the sludge circulation and sludge discharge pipeline connecting branch is provided with a sludge circulation and sludge discharge pipeline connecting branch control valve; the rated flow of the sludge discharge pump is greater than the rated flow of the sludge circulation pump; When the sludge circulation pump stops running due to special circumstances, part of the sludge transported by the sludge discharge pump enters the end of the sludge discharge main line, and the other part of the sludge passes through the open sludge circulation and sludge discharge pipeline connecting branch control valve and the sludge circulation into the coagulation sedimentation tank pipeline in turn and enters the coagulation sedimentation tank.

9. The sludge treatment mechanism based on the high-salinity wastewater pretreatment system according to claim 1, characterized in that: The coagulation sedimentation tank includes a first reaction cell, a second reaction cell, a magnetic powder loading cell, a coagulation cell, a flocculation cell and a sedimentation cell through which wastewater flows in sequence. A sludge hopper is provided at the bottom of the sedimentation cell, and an outlet pipeline at the bottom of the sludge hopper is connected to the sludge hopper; the sludge circulates into the coagulation sedimentation tank pipeline and is simultaneously connected to the first reaction cell and the coagulation cell.

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