A method for treating coal-containing wastewater based on magnetic coagulation technology

Abstract

This invention discloses a method for treating coal-containing wastewater based on magnetic coagulation technology, specifically relating to the field of wastewater treatment technology. The method includes steps one, two, three, four, five, and six. The sludge pretreatment device mentioned in steps four and five includes a treatment cylinder. Inside the treatment cylinder are multiple stirring rods for agitating the sludge. Each stirring rod includes a rod shell, inside which are absorbent cotton swabs. Multiple through-holes are formed at the outer end of the rod shell, and a removable bottom cover is provided at the bottom end of the rod shell. This invention separates the water-containing sludge from the sludge by concentrating the sludge containing moisture in the treatment cylinder and agitating it. During agitation, absorbent cotton swabs are used to absorb the water from the sludge. This method requires less time than static sedimentation, thus improving the efficiency of sludge treatment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and specifically to a method for treating coal-containing wastewater based on magnetic coagulation technology. Background Technology

[0002] Coal-containing wastewater refers to wastewater generated during coal mining, processing, and transportation, such as coal wastewater generated by spraying and sprinkling at coal stockpiles, coal wastewater washed off roads, and coal-containing rainwater flowing out of stockpiles during rainy days.

[0003] Coal-containing wastewater has a complex composition, mainly including soluble organic matter, inorganic salts, asphaltenes, phenols, acids, sulfur, etc. If it is discharged directly without treatment, the harmful substances in the wastewater will have a serious impact on the ecological environment and even human health.

[0004] To address this issue, existing technologies have enhanced the treatment effect through magnetic coagulation, resulting in more thorough precipitation of harmful substances, such as a magnetic coagulation-type coal-containing wastewater treatment system with publication number CN220034287U.

[0005] In the existing technology, a lot of sludge is generated in the process. This sludge still contains a lot of water. If it is discharged directly, it will waste water resources. Therefore, the conventional treatment method is to collect the sludge and then carry it to sedimentation to separate the clear liquid on the top. However, this treatment method is slow, the sedimentation time is long, and the treatment efficiency is low. Summary of the Invention

[0006] The purpose of this invention is to provide a method for treating coal-containing wastewater based on magnetic coagulation technology. By using absorbent cotton swabs to remove water from the sludge during the stirring process, the water in the sludge is separated from the sludge. This method requires less time than static sedimentation, thus improving the efficiency of sludge treatment.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for treating coal-containing wastewater based on magnetic coagulation technology, the specific steps of which are as follows:

[0008] Step 1: Untreated sewage is injected into the bar screen collection well. When the sewage enters the well, due to the large flow rate in the inlet pipe, the solid matter in the sewage will naturally sink and be intercepted after passing through the bar screen. This removes large solid impurities from the sewage. Then, the treated sewage in the bar screen collection well is pumped into the cyclone grit chamber using a sewage lift pump. The water will rotate inside the chamber. Under the combined action of buoyancy, fluid drag, and centrifugal and centripetal forces during rotation, the less dense water rises and is discharged from the outlet, while the denser sand particles are deposited at the bottom of the equipment and are eventually discharged through the drain outlet. Through these two treatments, most of the large suspended solids in the water are separated.

[0009] Step 2: The clear liquid separated in the cyclone grit chamber is injected into the collection tank. The high-concentration solid-liquid mixture is fed into the sand-water separator through the air-lift pipe. The sand-water separator is equipped with a separation device. After the mixture enters, the separation device rotates and generates centrifugal force. Due to the centrifugal force, the heavier sand particles are thrown out and settle downwards, while the lighter water is discharged through the holes or pipes of the separation device. The water separated in the sand-water separator is fed into the coagulation reactor. The water in the collection tank is also pumped into the coagulation reactor by the sewage lift pump. PAM coagulant aid, PAC coagulant and alkali solution are added to the coagulation reactor to produce coagulation and flocculation reactions in the sewage, thereby forming flocs to adsorb suspended solids in the water. After the water in the coagulation reactor is mixed with PAC and PAM and reacted fully, the sewage and flocs are fed into the pre-sedimentation tank. The flocs settle in the pre-sedimentation tank and are separated from the water. The clear liquid at the top after sedimentation is discharged after meeting the requirements for connection to the municipal sewage pipe network.

[0010] Step 3: The supernatant from the pre-sedimentation tank is fed into the magnetic coagulation equipment, along with coagulant aid PAM, coagulant PAC, and magnetic powder. After thorough mixing with water, the magnetic powder binds to the flocs formed during coagulation, creating stable flocs with magnetic powder as the flocculation nuclei. Since the specific gravity of magnetic powder is five times that of water, the specific gravity of the flocs containing magnetic powder rapidly increases. These flocs settle rapidly within minutes of flowing into the sedimentation tank, achieving a settling speed of up to 40 meters per hour, 20 times that of conventional coagulation sedimentation. Simultaneously, this process... The process further enhances the bridging, adsorption, and capture capabilities of the coagulation and flocculation reaction, strengthening the treatment effect. Subsequently, water along with flocs is injected into a magnetic separator to separate the treated water from the flocs containing magnetic powder. The magnetic separator generates a magnetic field, which uses magnetic force to attract the flocs containing magnetic force, concentrating them and separating them from the water, thereby removing pollutants from the water. The separated water is then output and stored in a reuse water tank. The water in the reuse water tank can meet the standards of urban wastewater, ultimately achieving the purpose of reuse.

[0011] Step 4: Solid impurities containing a small amount of water will be separated from the bar screen collection well, cyclone grit chamber, sand separator, pre-sedimentation tank, collection tank and magnetic separator. These impurities are called sludge. The sludge is collected and transported to the sludge pretreatment device to absorb the water it contains.

[0012] Step 5: The sludge still contains moisture after being treated by the sludge pretreatment device. This sludge can be processed by a screw press to remove the moisture and finally make sludge cake. After the sludge is transported to the feed port of the screw press through the pipeline, it is squeezed through the filter gap between the fixed ring and the moving ring under the push of the screw shaft. The moisture is discharged, and the solid sludge remains in the filter gap and gradually forms sludge cake. The sludge cake can be sent back to the stockpile for continued use.

[0013] Furthermore, the sludge pretreatment device mentioned in steps four and five includes a treatment cylinder, inside which are provided multiple stirring rods for stirring the sludge;

[0014] The stirring rod includes a rod shell, inside which is provided a water-absorbing cotton swab. Multiple through-holes are provided at the outer end of the rod shell, allowing water in the sludge to come into contact with the water-absorbing cotton swab through the through-holes. The bottom end of the rod shell is provided with a removable bottom cover. After removing the bottom cover, the rod shell can be opened to remove and replace the water-absorbing cotton swab.

[0015] Furthermore, a support frame is provided at the bottom of the processing cylinder, and two vertical plates on the support frame are respectively connected to both sides of the processing cylinder. The support frame serves to support the processing cylinder.

[0016] An input channel is fixedly provided on the rear side of the treatment cylinder. Untreated sludge is input into the treatment cylinder through the input channel. A sludge discharge pipe with a valve is fixedly provided at the bottom of the treatment cylinder. The treated sludge is discharged through the sludge discharge pipe.

[0017] Furthermore, a mounting bracket is fixedly provided at the top of the processing cylinder, and a central tube is rotatably connected to the mounting bracket. Two gears are provided at the bottom of the mounting bracket, one of which is fixedly located at the outer end of the central tube, and the two gears mesh with each other. A motor for driving the other gear to rotate is fixedly provided at the top of the mounting bracket.

[0018] Furthermore, a branch pipe is fixedly provided at the top of the rod shell, one end of which is fixedly connected to the outer end of the central pipe. The branch pipe is connected to the rod shell and the central pipe. A secondary sponge block is placed inside the central pipe, and a transmission sponge strip is placed inside the branch pipe. The two ends of the transmission sponge strip are fixedly connected to the secondary sponge block and the absorbent cotton rod, respectively.

[0019] Furthermore, the top of the central tube extends to the top of the mounting frame and is fixedly provided with a water purification cylinder. A primary sponge block is placed inside the water purification cylinder, and the top of the secondary sponge block extends into the water purification cylinder and is connected to the primary sponge block.

[0020] Furthermore, a pressing assembly is fixedly provided at the top of the mounting frame. The pressing assembly includes a vertical plate fixedly provided at the top of the mounting frame. The upper end of the vertical plate is bent into a horizontal state. A hydraulic cylinder is fixedly provided at the bottom end of the horizontal part of the vertical plate. The piston rod of the hydraulic cylinder faces downward and a mesh plate is fixedly provided at the bottom end of the piston rod. The mesh plate is located directly above the water purification cylinder.

[0021] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0022] 1. By concentrating the sludge containing moisture into the treatment drum and stirring it, the water in the sludge is absorbed by the water-absorbing cotton swabs during the stirring process, thus separating the water from the sludge. This method requires less time than static sedimentation, thus improving the efficiency of sludge treatment.

[0023] 2. By adsorbing water from the sludge, it ensures that only liquid can travel along the absorbent cotton swabs, the transfer sponge strips, the secondary sponge blocks, and the primary sponge blocks. Therefore, the water separated in this way does not contain solid impurities and is purer. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 This is an overall structural diagram of the sludge pretreatment device;

[0026] Figure 2 This is a diagram showing the internal structure of the treatment cylinder in a sludge pretreatment device.

[0027] Figure 3 This is a structural diagram of the stirring rod in a sludge pretreatment device.

[0028] Figure 4 A cross-sectional view of the stirring rod of the sludge pretreatment device;

[0029] Figure 5 Cross-sectional view of the water purification cylinder and central pipe of the sludge pretreatment device;

[0030] Figure 6 This is a structural diagram of the extrusion assembly of a sludge pretreatment device.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Processing cylinder; 101. Slag discharge pipe; 102. Input channel; 2. Support frame; 3. Extrusion assembly; 301. Vertical plate; 302. Hydraulic cylinder; 303. Mesh plate; 4. Mounting frame; 5. Clean water cylinder; 501. Central pipe; 502. Branch pipe; 6. Stirring rod; 601. Rod shell; 602. Connecting groove; 603. Water-absorbing cotton swab; 604. Bottom cover; 7. Motor; 8. Gear; 9. Primary sponge block; 10. Secondary sponge block; 11. Transmission sponge strip. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] This invention provides a method for treating coal-containing wastewater based on magnetic coagulation technology, the specific steps of which are as follows:

[0035] Step 1: Untreated sewage is injected into the bar screen collection well. When the sewage enters the well, due to the large flow rate in the inlet pipe, the solid matter in the sewage will naturally sink and be intercepted after passing through the bar screen made of wire mesh or plastic fence. This removes large solid impurities from the sewage. Then, the treated sewage in the bar screen collection well is pumped into the cyclone grit chamber using a sewage lift pump. When the water flows tangentially into the equipment from its inlet, the water will rotate inside. Due to the different densities of sand and water, under the combined action of buoyancy, fluid drag, and centrifugal and centripetal forces during rotation, the less dense water rises and is discharged from the outlet, while the denser sand particles are deposited at the bottom of the equipment and are eventually discharged through the drain outlet. Through these two treatments, most of the large suspended solids in the water are separated.

[0036] Step Two: The clear liquid separated in the cyclone grit chamber is injected into the collection tank. The high-concentration solid-liquid mixture is fed into the sand-water separator through an air-lift pipe. The sand-water separator contains a separation device, typically a rotating cylinder or spiral. Upon entering, the separator rotates, generating centrifugal force. Due to this force, heavier sand particles are thrown out and settle, while lighter water is discharged through the pores or pipes of the separator. The water separated in the sand-water separator is fed into the coagulation reactor. Water from the collection tank is also pumped into the coagulation reactor via a wastewater lift pump. Coagulant PAM, coagulant PAC, and alkali are added to the coagulation reactor to induce coagulation and flocculation reactions in the wastewater, forming flocs that adsorb suspended solids in the water. PAM is then added... Through the bridging and adsorption of its polymer chains, PAC causes suspended particles, colloidal substances, and organic pollutants in wastewater to aggregate and form larger flocs. These flocs easily settle under gravity, thus achieving solid-liquid separation and purifying wastewater. PAC, through mechanisms such as charge neutralization and adsorption bridging, can quickly adsorb negatively charged colloids and particles in wastewater, causing these particles to aggregate and grow, forming flocs that are easy to settle. This achieves efficient removal of suspended solids and some organic pollutants from wastewater. After the water in the coagulation reactor is mixed with PAC and PAM and reacts fully, the wastewater along with the flocs is fed into the pre-sedimentation tank. The flocs settle in the pre-sedimentation tank and are then separated from the water. The clear liquid at the top after sedimentation is discharged after meeting the requirements for connection to the municipal sewage network.

[0037] Step 3: The supernatant from the pre-sedimentation tank is input into the magnetic coagulation equipment, along with coagulant aid PAM, coagulant PAC, and magnetic powder. After thorough mixing with water, the magnetic powder combines with the flocs formed during coagulation, creating stable flocs with magnetic powder as flocculation nuclei. Since the specific gravity of magnetic powder is five times that of water, the specific gravity of the flocs containing magnetic powder rapidly increases. These flocs settle rapidly within minutes of flowing into the sedimentation tank, with a settling speed reaching 40 meters per hour, 20 times that of conventional coagulation sedimentation. Simultaneously, this process further enhances the bridging, adsorption, and trapping capabilities of the coagulation and flocculation reaction, strengthening the treatment effect. The water, along with the flocs, is then injected into a magnetic separator to separate the treated water from the flocs containing magnetic powder. The magnetic separator generates a magnetic field, which attracts the flocs containing magnetic powder, concentrating them and separating them from the water. This removes pollutants from the water. Traditional coagulation and sedimentation processes produce suspended solids in water below 20 mg / L. With the addition of a series of high-efficiency coagulation reactors and magnetic coagulation, the suspended solids in the effluent can be reduced to below 1 mg / L, ensuring better water quality. The separated water is then stored in a reuse tank, where it meets the standards for urban wastewater, ultimately achieving the goal of reuse.

[0038] Step 4: Solid impurities containing a small amount of water will be separated from the bar screen collection well, cyclone grit chamber, sand separator, pre-sedimentation tank, collection tank and magnetic separator. These impurities are called sludge. The sludge is collected and transported to the sludge pretreatment device to absorb the water it contains.

[0039] Step 5: The sludge still contains moisture after being treated by the sludge pretreatment device. This sludge can be processed by a screw press to remove the moisture and finally make sludge cake. After the sludge is transported to the feed port of the screw press through the pipeline, it is squeezed through the filter gap between the fixed ring and the moving ring under the push of the screw shaft. The moisture is discharged, and the solid sludge remains in the filter gap and gradually forms sludge cake. The sludge cake can be sent back to the stockpile for continued use.

[0040] The present invention also includes the sludge pretreatment device mentioned in steps four and five, such as Figures 1-6 It includes a processing cylinder 1, and the processing cylinder 1 is provided with a plurality of stirring rods 6 for stirring sludge;

[0041] The stirring rod 6 includes a rod shell 601, inside which is provided a water-absorbing cotton swab 603. The outer end of the rod shell 601 has a plurality of through grooves 602 that penetrate the rod shell 601, so that water in the sludge can come into contact with the water-absorbing cotton swab 603 through the through grooves 602. The bottom end of the rod shell 601 is provided with a detachable bottom cover 604. After removing the bottom cover 604, the rod shell 601 can be opened so that the water-absorbing cotton swab 603 can be taken out and replaced.

[0042] After the water-containing sludge is fed into the treatment cylinder 1, the driving stirring rod 6 rotates inside the treatment cylinder 1 to stir the sludge. During the stirring process, the sludge and the water contained therein can come into contact with the water-absorbing cotton rod 603 through the connecting groove 602. The water is thus absorbed by the water-absorbing cotton rod 603. After a period of stirring, most of the water contained in the sludge is absorbed. Stirring is continued until the surface of the sludge is no longer visually visibly wet.

[0043] like Figure 1 and Figure 2 As shown, the bottom of the processing cylinder 1 is provided with a support frame 2. Two vertical plates on the support frame 2 are respectively connected to both sides of the processing cylinder 1. The support frame 2 serves to support the processing cylinder 1. The support frame 2 can be fixed on the ground to improve the overall stability of the pretreatment device.

[0044] An input channel 102 is fixedly provided on the rear side of the treatment cylinder 1. Untreated sludge is input into the treatment cylinder 1 through the input channel 102. A sludge discharge pipe 101 with a valve is fixedly provided at the bottom of the treatment cylinder 1. The treated sludge is discharged through the sludge discharge pipe 101.

[0045] To drive the stirring rod 6 to rotate, such as Figures 2-5 As shown, a mounting bracket 4 is fixedly provided at the top of the processing cylinder 1. A central tube 501 is rotatably connected to the mounting bracket 4. Two gears 8 are provided at the bottom of the mounting bracket 4. One gear 8 is fixedly provided at the outer end of the central tube 501. The two gears 8 mesh with each other. A motor 7 is fixedly provided at the top of the mounting bracket 4 to drive the other gear 8 to rotate. The motor 7 drives the gear 8 at one end of its output shaft to rotate. Under the drive of the gear 8, the gear 8 at the outer end of the central tube 501 rotates accordingly and drives the central tube 501 to rotate.

[0046] A branch pipe 502 is fixedly provided at the top of the rod shell 601. One end of the branch pipe 502 is fixedly connected to the outer end of the central pipe 501. The branch pipe 502 communicates with the rod shell 601 and the central pipe 501. A secondary sponge block 10 is placed inside the central pipe 501. A transmission sponge strip 11 is placed inside the branch pipe 502. The two ends of the transmission sponge strip 11 are fixedly connected to the secondary sponge block 10 and the absorbent cotton rod 603, respectively. When the central pipe 501 rotates, it drives the branch pipe 502 at its outer end to rotate. The branch pipe 502 then drives the stirring rod 6 to rotate, so that all the stirring rods 6 rotate around the central pipe 501, thereby achieving the purpose of stirring the sludge.

[0047] The top end of the central tube 501 extends to the top of the mounting bracket 4 and is fixedly mounted on a water purification cylinder 5. A primary sponge block 9 is placed inside the water purification cylinder 5. The top end of the secondary sponge block 10 extends into the water purification cylinder 5 and is connected to the primary sponge block 9. The absorbent cotton swab 603, the primary sponge block 9, the secondary sponge block 10 and the transmission sponge strip 11 all have strong water absorption.

[0048] During the mixing process, after the absorbent cotton swab 603 absorbs water from the sludge, the absorbent cotton swab 603 becomes wet. Once the absorbent cotton swab 603 is completely wet, the water extends upwards, causing the transmission sponge strip 11 to become wet. After the transmission sponge strip 11 becomes wet, the water continues to spread and wet the secondary sponge block 10, and finally wets the primary sponge block 9.

[0049] The absorbed water eventually needs to be discharged, such as Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the top of the mounting frame 4 is fixedly provided with a pressing component 3. The pressing component 3 includes a vertical plate 301 fixedly provided at the top of the mounting frame 4. The upper end of the vertical plate 301 is bent into a horizontal state. A hydraulic cylinder 302 is fixedly provided at the bottom of the horizontal part of the vertical plate 301. The piston rod of the hydraulic cylinder 302 faces downward and a mesh plate 303 is fixedly provided at the bottom of the piston rod. The mesh plate 303 is located directly above the water purification cylinder 5.

[0050] During stirring, once the primary sponge block 9 is fully soaked, the hydraulic cylinder 302 extends downwards and pushes the mesh plate 303 downwards. The mesh plate 303 then enters the water purification cylinder 5 and squeezes the primary sponge block 9, thereby squeezing out the water adsorbed within it. The squeezed water passes through the mesh plate 303 and spreads above it. The squeezed water is then extracted from the water purification cylinder 5, yielding water separated from the sludge. After the water is extracted, the hydraulic cylinder 302 contracts, causing the mesh plate 303 to move upwards back to its original position. The primary sponge block 9 then rebounds. As the water is squeezed out, the sponge block 9 regains its absorbency and can continue to absorb water until it is fully soaked. This cycle repeats, constantly squeezing out water. After the water in the primary sponge block 9 is squeezed out, it will absorb water from the secondary sponge block 10. After the secondary sponge block 10 absorbs water, it will absorb water from the transfer sponge strip 11. Similarly, the transfer sponge strip 11 absorbs water from the absorbent cotton swab 603. The absorbent cotton swab 603 continuously absorbs water from the sludge. Therefore, after the absorbency of the primary sponge block 9 is restored, the water in the sludge can be continuously transported to the primary sponge block 9.

[0051] In this way, water is continuously absorbed from the sludge during the stirring process, requiring less time and eliminating the need for prolonged settling, thus resulting in higher treatment efficiency. Secondly, if water is separated from the sludge using traditional sedimentation methods, it is difficult to maintain the purity of the supernatant because the bottom of the supernatant is in direct contact with the sludge. If this part of the sludge is directly extracted, it is very easy to carry out many impurities. However, since only liquid can sequentially wet the absorbent cotton swab 603, the transfer sponge strip 11, the secondary sponge block 10, and the primary sponge block 9, the water obtained by adsorption is equivalent to being filtered once by the above four components. The treated water does not contain solid impurities and is purer.

[0052] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for treating coal-containing wastewater based on magnetic coagulation technology, characterized in that: The specific steps are as follows: Step 1: Untreated sewage is injected into the bar screen collection well, and then the treated sewage in the bar screen collection well is pumped into the cyclone grit chamber using a sewage lift pump. Through these two treatments, most of the large particulate solid suspended matter in the water is separated. Step 2: The clear liquid separated in the cyclone grit chamber is injected into the collection tank, while the high-concentration solid-liquid mixture is fed into the sand-water separator through the air-lift pipe. The water separated in the sand-water separator is fed into the coagulation reactor. The water in the collection tank is also pumped into the coagulation reactor by the sewage lift pump. PAM coagulant aid, PAC coagulant and alkali solution are added to the coagulation reactor. After the water in the coagulation reactor is mixed with PAC and PAM and reacted fully, the sewage along with the flocculents is fed into the pre-sedimentation tank. The flocculents settle in the pre-sedimentation tank and are then separated from the water. Step 3: Input the supernatant from the pre-sedimentation tank into the magnetic coagulation equipment, and add coagulant PAM, coagulant PAC and magnetic powder. After the three are mixed evenly with water, the magnetic powder combines with the flocs in the coagulation process to form stable flocs with magnetic powder as the coagulation nucleus. Then, the water along with the flocs is injected into the magnetic separator to separate the treated water and the flocs containing magnetic powder. The separated water is output and stored in the recycled water tank. Step 4: Solid impurities containing a small amount of moisture—sludge—will be separated from the bar screen collection well, cyclone grit chamber, sand separator, pre-sedimentation tank, collection tank, and magnetic separator. This sludge is collected and transported to the sludge pretreatment device to absorb the moisture it contains. Step 5: The sludge pretreatment device is processed by a screw press to remove the water from the sludge and form a sludge cake. The sludge pretreatment device includes a treatment cylinder (1), and the treatment cylinder (1) is provided with a plurality of stirring rods (6) for stirring the sludge. The stirring rod (6) includes a rod shell (601), an absorbent cotton rod (603) is provided inside the rod shell (601), a plurality of through grooves (602) are provided at the outer end of the rod shell (601), and a detachable bottom cover (604) is provided at the bottom end of the rod shell (601). The top of the processing cylinder (1) is fixedly provided with a mounting bracket (4), and a central tube (501) that passes through the mounting bracket (4) is rotatably connected to the mounting bracket (4). Two gears (8) are provided at the bottom of the mounting bracket (4), one of which is fixedly provided at the outer end of the central tube (501). The two gears (8) mesh with each other. A motor (7) for driving the other gear (8) to rotate is fixedly provided at the top of the mounting bracket (4). The top of the rod shell (601) is fixedly provided with a branch pipe (502), one end of the branch pipe (502) is fixedly connected to the outer end of the central pipe (501), a secondary sponge block (10) is placed inside the central pipe (501), and a transmission sponge strip (11) is placed inside the branch pipe (502). The two ends of the transmission sponge strip (11) are fixedly connected to the secondary sponge block (10) and the absorbent cotton rod (603) respectively. The top end of the central tube (501) extends to the top of the mounting bracket (4) and is fixedly provided with a water purification cylinder (5). A primary sponge block (9) is placed inside the water purification cylinder (5). The top end of the secondary sponge block (10) extends into the water purification cylinder (5) and is connected to the primary sponge block (9). The top of the mounting frame (4) is fixedly provided with an extrusion assembly (3). The extrusion assembly (3) includes a vertical plate (301) fixedly provided at the top of the mounting frame (4). A hydraulic cylinder (302) is fixedly provided at the bottom of the horizontal part of the vertical plate (301). The piston rod of the hydraulic cylinder (302) faces downward and a mesh plate (303) is fixedly provided at the bottom of the piston rod. The mesh plate (303) is located directly above the water purification cylinder (5).

2. The method for treating coal-containing wastewater based on magnetic coagulation technology according to claim 1, characterized in that: The bottom of the processing cylinder (1) is provided with a support frame (2), and two vertical plates on the support frame (2) are respectively connected to the two sides of the processing cylinder (1); An input channel (102) is fixedly provided on the rear side of the processing cylinder (1), and a slag discharge pipe (101) with a valve is fixedly provided at the bottom end of the processing cylinder (1).

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