An integrated magnetic coagulation water treatment system with loading and flocculation

Abstract

This utility model discloses an integrated modified magnetic coagulation water treatment system combining loading and flocculation, comprising a rapid mixing tank, a loading flocculation tank, a sedimentation tank, a PAM dispersion device, a magnetic powder recovery unit, a magnetic sludge return pump group, and a sludge discharge unit. The loading flocculation tank is equipped with an agitator, a flow guide baffle, and a water distribution device. The water distribution device includes a flow guide baffle, which divides the interior of the loading flocculation tank into a flocculation zone and a loading zone. The flow guide baffle has multiple water passage holes, each with a flow guide baffle above it. The two layers of impellers of the agitator are located in the flocculation zone and the loading zone, respectively. The PAM dispersion device includes an annular pipe and a PAM dosing pipe. The annular pipe is arranged adjacent to each other below the flow guide baffle, and its upper sidewall has multiple sets of dosing ports. This utility model integrates loading and flocculation into one tank, resulting in a reasonable and compact structure, small footprint, low energy consumption, and reduced construction and operating costs. It also facilitates low-cost in-situ modification and iterative upgrades of traditional high-density tanks.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a modified magnetic coagulation water treatment system with integrated loading and flocculation. Background Technology

[0002] Existing magnetic coagulation (MCC) wastewater treatment systems typically include a rapid mixing tank, a loading tank, a flocculation tank, a sedimentation tank, a magnetic powder recovery unit, and a sludge discharge unit. For treating recalcitrant COD, an activated carbon adsorption tank can be flexibly added. In these systems, the loading tank and flocculation tank are two independent tanks with their own functions, and each requires its own agitator. Furthermore, in wastewater treatment plant upgrades, existing high-density sedimentation tanks often need to be converted to MCC sedimentation tanks. Traditional high-density sedimentation tank systems typically have two compartments: a rapid mixing tank and a flocculation tank (equipped with a flow guide). Following traditional conversion methods, converting a high-density sedimentation tank to a MCC sedimentation tank requires creating a loading tank, resulting in significant changes to the civil engineering structure and high construction costs. Therefore, existing technologies urgently need further improvement and enhancement. Utility Model Content

[0003] To address the shortcomings of the existing technology, the purpose of this utility model is to propose an integrated loading and flocculation improved magnetic coagulation water treatment system. This system addresses the problems of the loading tank and flocculation tank being two independent tanks in the magnetic coagulation water treatment system, each requiring a separate agitator, resulting in high energy consumption, large footprint, and the need to add a tank for upgrading the existing water treatment system, which is difficult and costly.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An integrated modified magnetic coagulation water treatment system with loading and flocculation includes a rapid mixing tank, a loading and flocculation tank, a sedimentation tank, a PAM dispersion device, a magnetic powder recovery unit, a magnetic sludge return pump group, and a sludge discharge unit. The rapid mixing tank, the loading and flocculation tank, and the sedimentation tank are arranged adjacent to each other. The rapid mixing tank has an inlet on one side and is connected to the loading and flocculation tank through a water passage. The upper part of the loading and flocculation tank is connected to the sedimentation tank.

[0006] An agitator is provided inside the rapid mixing tank, and a flow guide baffle is provided on the side of the loading flocculation tank near the rapid mixing tank. A magnetic powder loading channel is formed between the flow guide baffle and the side wall of the loading flocculation tank. A water distribution and guiding device is provided on the side of the flow guide baffle away from the rapid mixing tank.

[0007] The water distribution and diversion device includes a water distribution baffle, a diversion baffle, and a water-receiving strip. The water distribution baffle is located in the middle of the loading flocculation tank, dividing the interior of the loading flocculation tank into an upper flocculation zone and a lower loading zone. The water distribution baffle has multiple water passage holes, and the loading zone is connected to the flocculation zone through the water passage holes.

[0008] Each water passage hole is equipped with a flow guide baffle above it and a water-receiving strip on its inner side. The loading flocculation tank is equipped with a stirring mechanism, which adopts a double-layer blade structure, with the two layers of blades located in the flocculation zone and the loading zone, respectively.

[0009] The PAM dispersion device includes an annular pipe and a PAM dosing pipe. The annular pipe is arranged adjacent to each other below the water distribution baffle. One end of the PAM dosing pipe is connected to the annular pipe. The upper side wall of the annular pipe has multiple sets of outlets that are equal in number to the number of water passage holes and whose positions correspond one-to-one.

[0010] The sedimentation tank is equipped with a sludge scraper, an inclined tube, a flushing device, and a water collection tank. The inclined tube is installed in the middle of the sedimentation tank, and the water collection tank and the flushing device are respectively located above and below the inclined tube.

[0011] Furthermore, the water inlet is located at the lower part of the side wall of the rapid mixing tank, and the water passage is located at the upper part of the side adjacent to the rapid mixing tank and the loading flocculation tank.

[0012] The flow guide baffle is a square flat plate, which is vertically arranged on the side adjacent to the loading flocculation tank and the water passage. Its two ends are fixedly connected to the two opposite side walls of the loading flocculation tank. The water in the rapid mixing tank enters the loading area through the water passage and the magnetic powder loading channel.

[0013] The corners of the sidewalls adjacent to the loading flocculation tank and the water passage tunnel and their bottom slabs are chamfered.

[0014] Furthermore, the water inlet is located on the upper part of the side wall of the rapid mixing tank, and the water passage is located on the lower part of the side adjacent to the loading flocculation tank of the rapid mixing tank.

[0015] The flow guide baffle is an L-shaped bent plate, which is vertically arranged at a position corresponding to the water passage. The two ends of the flow guide baffle are fixedly connected to the two adjacent side walls of the loading flocculation tank, respectively. The water in the rapid mixing tank enters the loading zone through the water passage and below the flow guide baffle.

[0016] Furthermore, the water distribution baffle is a horizontally arranged flat plate structure, and its outer edge is fixedly connected to the flow guide baffle and the side wall of the loading flocculation tank.

[0017] The stirring mechanism includes a stirring shaft and a geared motor. The stirring shaft is sealed to the center of the water distribution baffle through a sealing sleeve. The upper blades are upward-lifting blades, and the lower blades are downward-pressing blades. The geared motor drives the two blades to rotate through the stirring shaft.

[0018] Furthermore, all the water passage holes are evenly arranged in a ring on the circumference with the center of the water distribution baffle as the center. The flow guide baffle is a square metal plate and is located directly above the corresponding water passage hole. The flow guide baffle is fixedly connected to the water distribution baffle through a bracket.

[0019] The water-receiving strip is a strip-shaped metal sheet with rounded ends. Both ends are fixedly connected to the side wall of the water passage hole, and the water-receiving strip divides the water passage hole into two water passage channels.

[0020] Furthermore, the annular pipe is circular and arranged concentrically with the center of the water distribution baffle, and the center lines of each water-receiving strip are arranged along the normal direction of the circumference of all the water-passing holes.

[0021] Each group of outlets includes two outlets arranged in a figure-eight pattern, with both outlets in the same group facing the water-receiving strip above.

[0022] Furthermore, the magnetic powder recovery unit includes a magnetic powder recovery pump, a high shear machine, and a magnetic separator. The bottom outlet of the sedimentation tank is connected to the inlet pipes of the magnetic powder recovery pump and the magnetic mud return pump group, respectively. The outlet of the magnetic mud return pump group is connected to the upper pipe of the magnetic powder loading channel.

[0023] Both the magnetic powder recovery pump and the magnetic mud return pump are spiral centrifugal pumps. The inlet of the magnetic separator is connected to the outlet pipeline of the magnetic powder recovery pump through a high shear machine, and the discharge port of the magnetic separator is connected to the upper pipeline of the magnetic powder loading channel.

[0024] Furthermore, the sludge discharge unit includes a sludge temporary storage tank and a sludge discharge pump set. The sludge discharge pump is a slurry pump. The sludge discharge port of the magnetic separator is connected to the pipeline of the sludge temporary storage tank. The sludge discharge pump set transports the sludge from the sludge temporary storage tank to the sludge dewatering workshop.

[0025] Furthermore, a PAC dosing pipe is provided inside the rapid mixing tank, and the PAC dosing pipe is located on the side near the water inlet.

[0026] By adopting the above technical solution, the beneficial technical effects of this utility model are:

[0027] 1. This utility model integrates the magnetic loading tank and flocculation tank in a conventional magnetic coagulation system into a single loading flocculation tank. The water distribution and diversion device divides the loading flocculation tank into an upper flocculation zone and a lower loading zone, guiding the water flow from the loading zone into the flocculation zone. The diversion baffles transport the recovered magnetic powder (replenished magnetic powder) and the returned magnetic mud from top to bottom to the loading zone. Compared with the conventional magnetic coagulation system, this design is more compact and reasonable, reducing the floor space required.

[0028] 2. The loading flocculation tank of this utility model only needs to be equipped with a double-layer blade stirring mechanism, with one layer of blades in the loading zone and one layer in the flocculation tank. By utilizing engineering experience and CFD flow simulation, the blades are reasonably arranged to ensure that the media in the two zones are independently and fully mixed and reacted. Compared with the conventional magnetic coagulation system, reducing one stirrer can reduce the system energy consumption by 10-20%.

[0029] 3. This utility model optimizes the existing magnetic concrete system, making it easier to upgrade and modify equipment, saving low investment and operating costs. It is superior to conventional magnetic concrete systems in terms of both land occupation and energy consumption, and is superior to conventional magnetic concrete systems in all aspects, fully responding to the call for green and low-carbon development. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structural principle of the first implementation of this utility model.

[0031] Figure 2 This is a top view of the first implementation of this utility model.

[0032] Figure 3 This is a schematic diagram of the combined structure of the fast mixing tank and the loading flocculation tank in the first implementation of this utility model.

[0033] Figure 4 This is a schematic diagram of the combination of the water distribution and diversion device and the PAM dispersion device of this utility model.

[0034] Figure 5 yes Figure 4 Top view of the assembly shown.

[0035] Figure 6 yes Figure 5 A magnified view of part A in the middle.

[0036] Figure 7 This is a schematic diagram of the structural principle of the second implementation of this utility model.

[0037] Figure 8 This is a top view of the second implementation of this utility model.

[0038] Figure 9 This is a schematic diagram of the combined structure of the fast mixing tank and the loading flocculation tank in the second implementation of this utility model.

[0039] The diagram shows: 1. Rapid mixing tank; 11. Inlet; 12. Water passage; 13. PAC dosing pipe; 14. Agitator; 2. Loading flocculation tank; 21. Loading zone; 22. Flocculation zone; 23. Agitator shaft; 24. Gear motor; 25. Paddle; 26. Sealing sleeve; 3. Sedimentation tank; 31. Sludge scraper; 32. Inclined pipe; 33. Flushing device; 34. Water collection tank; 4. Flow guide baffle; 51. Water distribution baffle; 511. Water passage hole; 52. Flow guide baffle; 53. Water receiving strip; 54. Support; 61. Annular pipe; 62. PAM dosing pipe; 63. Dosing outlet; 71. Magnetic powder recovery pump; 72. High shear machine; 73. Magnetic separator; 8. Magnetic sludge return pump set; 91. Sludge temporary storage tank; 92. Sludge discharge pump set. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings:

[0041] Example 1, combined with Figures 1 to 6 An integrated modified magnetic coagulation water treatment system with loading and flocculation includes a rapid mixing tank 1, a loading and flocculation tank 2, a sedimentation tank 3, a PAM dispersion device, a magnetic powder recovery unit, a magnetic sludge return pump group 8, and a sludge discharge unit. The rapid mixing tank 1, the loading and flocculation tank 2, and the sedimentation tank 3 are arranged adjacent to each other. The rapid mixing tank 1 is provided with an inlet 11 on one side. The rapid mixing tank 1 is connected to the loading and flocculation tank 2 by a water passage 12. The upper part of the loading and flocculation tank 2 is connected to the sedimentation tank 3. The inlet 11 and the water passage 12 are opposite to each other and staggered.

[0042] The rapid mixing tank 1 adopts a bottom inlet and top outlet design. Specifically, the inlet 11 is located at the lower part of the side wall of the rapid mixing tank 1, and the water passage 12 is located at the upper part of the side adjacent to the loading flocculation tank 2 of the rapid mixing tank 1. An agitator 14 with a single-layer blade structure is provided inside the rapid mixing tank 1. A PAC dosing pipe 13 is also provided inside the rapid mixing tank 1, located near the inlet 11. In operation, coagulant is added into the rapid mixing tank 1 through the PAC dosing pipe 13. The coagulant flows into the rapid mixing tank 1 with the water flow from the inlet. Under the action of the agitator 14 inside the rapid mixing tank, the sewage and the PAC added through the PAC dosing pipe 16 are rapidly mixed.

[0043] A flow guide baffle 4 is provided on the side of the loading flocculation tank 2 near the rapid mixing tank 1, forming a magnetic powder loading channel between the flow guide baffle 4 and the side wall of the loading flocculation tank 2. Specifically, the flow guide baffle 4 is a square flat plate, which can be made of reinforced concrete or SS304 / SS316 stainless steel. The flow guide baffle 4 is vertically arranged on the side of the loading flocculation tank 2 near the water passage 12, and its two ends are fixedly connected to the two opposite side walls of the loading flocculation tank 2, respectively. There is a gap between the lower end of the flow guide baffle 4 and the bottom of the loading flocculation tank 2. The water in the rapid mixing tank 1 flows into the loading area 21 through the water passage 12 and the magnetic powder loading channel. The corners of the side walls of the loading flocculation tank 2 adjacent to the water passage 12 and the bottom plate of the loading flocculation tank 2 are chamfered to effectively prevent the accumulation of magnetic powder at the corners.

[0044] A water distribution and guiding device is provided on the side of the baffle plate 4 away from the rapid mixing tank 1. The water distribution and guiding device includes a water distribution baffle plate 51, a guide baffle plate 52, and a water-receiving strip 53. The water distribution baffle plate 51 is a horizontally arranged flat plate structure. The water distribution baffle plate 51 is located in the middle of the loading flocculation tank 2, and its outer edge is fixedly connected to the baffle plate 4 and the side wall of the loading flocculation tank 2.

[0045] Specifically, the water distribution baffle 51 divides the interior of the loading flocculation tank 2 into an upper flocculation zone 22 and a lower loading zone 21. The water distribution baffle 51 has multiple water passage holes 511, and the loading zone 21 communicates with the flocculation zone 22 through these holes. All the water passage holes 511 are evenly arranged in a ring on the circumference of the water distribution baffle 51. The flow guide baffle 52 is a square metal plate, positioned directly above the corresponding water passage hole 511, and is fixedly connected to the water distribution baffle 51 via a bracket 54.

[0046] Each water passage hole 511 is provided with a flow guide baffle 52 above it, and a water-receiving strip 53 is provided on its inner side. Specifically, the water-receiving strip 53 is a strip-shaped metal sheet with rounded ends. The center line of each water-receiving strip 53 is arranged along the normal direction of the circumference of all water passage holes 511. Both ends of the water-receiving strip 53 are fixedly connected to the side wall of the water passage hole 511 in which it is located. The water-receiving strip 53 divides the water passage hole 511 into two water passage channels.

[0047] The loading flocculation tank 2 is equipped with a stirring mechanism, which adopts a double-layer blade structure. The two layers of blades 25 are located in the flocculation zone 22 and the loading zone 21, respectively. The stirring mechanism includes a stirring shaft 23 and a reduction motor 24. The stirring shaft 23 is rotated and sealed with the center of the water distribution baffle 51 through a sealing sleeve 26. The upper blade 25 is an upward-lifting blade, and the lower blade 25 is a downward-pressing blade. The reduction motor 24 drives the two layers of blades 25 to rotate through the stirring shaft 23. Under the stirring action, the water flow in the loading zone 21 is pressed down and flows to the bottom and sides of the tank, and further rises along the tank wall. Under the guidance of the water distribution baffle 51 and the downward-pressing blades, it turns back and forms an internal circulation in the loading zone 21. The average flow velocity of the liquid inside should be 0.25-0.3 m / s to achieve thorough mixing.

[0048] Before the fully mixed wastewater, magnetic powder, and magnetic sludge pass through the water-passing holes 511 on the water distribution baffle 51, they first converge with the PAM added by the PAM dispersion device. Simultaneously, as they pass through the water-passing holes 511, they form small vortices under the action of the water-receiving strips 53. Then, they are dispersed in all directions by the guide baffles 52, and finally, they are lifted upwards by the upward-lifting blades in the flocculation zone, achieving rapid and uniform mixing. The loading zone 21 uses upward-lifting blades, and the flocculation zone 22 uses downward-pressing blades, with an average liquid flow velocity of 0.2-0.25 m / s inside. The beneficial effect of this arrangement is that the liquid can be pre-mixed when passing through the guide device 7 before being distributed to the surrounding areas, shortening the residence time in the flocculation zone.

[0049] The PAM dispersion device includes an annular pipe 61 and a PAM dosing pipe 62. The annular pipe 61 is arranged adjacent to each other below the water distribution baffle 51, with the center of the annular pipe 61 concentric with the center of the water distribution baffle 51. One end of the PAM dosing pipe 62 is connected to the annular pipe 61. The upper side wall of the annular pipe 61 has multiple sets of outlets 63, the number of which corresponds to the number of water passage holes 511 and their positions are one-to-one. Each set of outlets 63 includes two outlets 63 arranged in a figure-eight pattern. The two outlets 63 in the same set are directly opposite the water-receiving strip 53 above. The specific implementation should be reasonably configured and selected based on engineering experience and CFD flow simulation.

[0050] The sedimentation tank 3 is equipped with a sludge scraper 31, an inclined tube 32, a flushing device 33, and a water collection tank 34. The inclined tube 32 is installed in the middle of the sedimentation tank 3, and the water collection tank 34 and the flushing device 33 are respectively located above and below the inclined tube 32. Wastewater, magnetic powder, magnetic sludge, and PAM are fully mixed under the action of the stirring structure inside the loading flocculation tank. The upward-lifting blades in the flocculation zone 22 can effectively prevent the exchange of liquids in the flocculation zone 22 and the loading zone 21 at the water distribution baffle 51. After the liquid in the flocculation zone 22 enters the sedimentation tank, it reaches the lower part of the sedimentation tank 3 under the action of the guide wall for solid-liquid separation. Some of the escaped solids are captured by the inclined tube 33, and the qualified clear water exits from the top of the sedimentation tank 3.

[0051] The magnetic powder recovery unit includes a magnetic powder recovery pump 71, a high-shear mill 72, and a magnetic separator 73. The bottom outlet of the sedimentation tank 3 is connected to the inlet pipes of the magnetic powder recovery pump 71 and the magnetic mud return pump group 8, respectively. The outlet of the magnetic mud return pump group 8 is connected to the upper pipe of the magnetic powder loading channel. Both the magnetic powder recovery pump 71 and the magnetic mud return pump are spiral centrifugal pumps, which have better conveying capacity. The inlet of the magnetic separator 73 is connected to the outlet pipe of the magnetic powder recovery pump 71 through the high-shear mill 72, and the discharge port of the magnetic separator 73 is connected to the upper pipe of the magnetic powder loading channel.

[0052] The sludge discharge unit includes a sludge storage tank 91 and a sludge discharge pump group 92. The sludge discharge pump is a slurry pump. The sludge discharge port of the magnetic separator 73 is connected to the pipeline of the sludge storage tank 91. The sludge discharge pump group 92 transports the sludge from the sludge storage tank 91 to the sludge dewatering workshop. The magnetic sludge settled at the bottom of the sedimentation tank 3 is collected into the intermediate sludge hopper by the scraper 31. Part of it enters the loading zone 21 through the magnetic sludge return pump group 8 and is guided by the baffle plate 4. The other part is recovered by the magnetic powder recovery unit. The recovered magnetic powder and the added magnetic powder enter the loading zone 21 through the baffle plate 4. The remaining sludge enters the sludge storage tank 91 and is transported to the sludge dewatering workshop by the sludge discharge pump 92.

[0053] Example 2, combined with Figures 4 to 9 An integrated modified magnetic coagulation water treatment system with loading and flocculation includes a rapid mixing tank 1, a loading and flocculation tank 2, a sedimentation tank 3, a PAM dispersion device, a magnetic powder recovery unit, a magnetic sludge return pump group 8, and a sludge discharge unit. The rapid mixing tank 1, the loading and flocculation tank 2, and the sedimentation tank 3 are arranged adjacent to each other. The rapid mixing tank 1 is provided with an inlet 11 on one side. The rapid mixing tank 1 is connected to the loading and flocculation tank 2 through a water passage 12. The upper part of the loading and flocculation tank 2 is connected to the sedimentation tank 3.

[0054] The rapid mixing tank 1 adopts an upper inlet and lower outlet design. Specifically, the inlet 11 is located on the upper part of the side wall of the rapid mixing tank 1, and the water passage 12 is located on the lower part of the side adjacent to the loading flocculation tank 2 of the rapid mixing tank 1. An agitator 14 is provided inside the rapid mixing tank 1. The agitator 14 adopts a single-layer blade structure. A PAC dosing pipe 13 is provided inside the rapid mixing tank 1. The PAC dosing pipe 13 is located on the side close to the inlet 11. In the working state, coagulant is added into the rapid mixing tank 1 through the PAC dosing pipe 13. The coagulant flows into the rapid mixing tank 1 with the water flow from the inlet, and the agitator 14 makes the coagulant evenly distributed in the rapid mixing tank 1.

[0055] A flow guide baffle 4 is provided on the side of the loading flocculation tank 2 near the rapid mixing tank 1, forming the magnetic powder loading channel between the flow guide baffle 4 and the side wall of the loading flocculation tank 2. Specifically, the flow guide baffle 4 is an L-shaped bent plate, which can be made of reinforced concrete or SS304 / SS316 stainless steel. The flow guide baffle 4 is vertically arranged near the water passage 12, and its two ends are fixedly connected to two adjacent side walls of the loading flocculation tank 2, respectively. There is a gap between the lower end of the flow guide baffle 4 and the bottom of the loading flocculation tank 2.

[0056] The water in the rapid mixing tank 1 flows into the loading zone 21 through the water passage 12 and below the guide baffle 4. In this embodiment, the magnetic powder separated by the magnetic separator 73, the added magnetic powder, and the magnetic mud converge in the magnetic powder loading channel, fall into the water passage 12, and enter the loading zone 21 with the water flow.

[0057] A water distribution and guiding device is provided on the side of the baffle plate 4 away from the rapid mixing tank 1. The water distribution and guiding device includes a water distribution baffle plate 51, a guide baffle plate 52, and a water-receiving strip 53. The water distribution baffle plate 51 is a horizontally arranged flat plate structure. The water distribution baffle plate 51 is located in the middle of the loading flocculation tank 2, and its outer edge is fixedly connected to the baffle plate 4 and the side wall of the loading flocculation tank 2.

[0058] The water distribution baffle 51 divides the interior of the loading flocculation tank 2 into an upper flocculation zone 22 and a lower loading zone 21. Multiple water passage holes 511 are provided on the water distribution baffle 51, and the loading zone 21 communicates with the flocculation zone 22 through these holes. All the water passage holes 511 are evenly arranged in a ring on the circumference of the water distribution baffle 51. A flow guide baffle 52 is a square metal plate, positioned directly above the corresponding water passage hole 511. The flow guide baffle 52 is fixedly connected to the water distribution baffle 51 via a bracket 53.

[0059] Each water passage hole 511 is provided with a flow guide baffle 52 above it, and a water-receiving strip 53 is provided on its inner side. Specifically, the water-receiving strip 53 is a strip-shaped metal sheet with rounded ends. The center line of each water-receiving strip 53 is arranged along the normal direction of the circumference of all water passage holes 511. Both ends of the water-receiving strip 53 are fixedly connected to the side wall of the water passage hole 511 in which it is located. The water-receiving strip 53 divides the water passage hole 511 into two water passage channels.

[0060] The loading flocculation tank 2 is equipped with a stirring mechanism, which adopts a double-layer blade structure. The two layers of blades 25 are located in the flocculation zone 22 and the loading zone 21, respectively. The stirring mechanism includes a stirring shaft 23 and a reduction motor 24. The stirring shaft 23 is rotated and sealed with the center of the water distribution baffle 51 through a sealing sleeve 26. The upper blade 25 is an upward-lifting blade, and the lower blade 25 is a downward-pressing blade. The reduction motor 24 drives the two layers of blades 25 to rotate through the stirring shaft 23. Under the stirring action, the water flow in the loading zone 21 is pressed down and flows to the bottom and sides of the tank, and further rises along the tank wall. Under the guidance of the water distribution baffle 51 and the downward-pressing blades, it turns back and forms an internal circulation in the loading zone 21. The average flow velocity of the liquid inside should be 0.25-0.3 m / s to achieve thorough mixing.

[0061] Before the fully mixed wastewater, magnetic powder, and magnetic sludge pass through the water-passing holes 511 on the water distribution baffle 51, they first converge with the PAM added by the PAM dispersion device. Simultaneously, as they pass through the water-passing holes 511, they form small vortices under the action of the water-receiving strips 53. Then, they are dispersed in all directions by the guide baffles 52, and finally, they are lifted upwards by the upward-lifting blades in the flocculation zone, achieving rapid and uniform mixing. The loading zone 21 uses upward-lifting blades, and the flocculation zone 22 uses downward-pressing blades, with an average liquid flow velocity of 0.2-0.25 m / s inside. The beneficial effect of this arrangement is that the liquid can be pre-mixed when passing through the guide device 7 before being distributed to the surrounding areas, shortening the residence time in the flocculation zone.

[0062] The PAM dispersion device includes an annular pipe 61 and a PAM dosing pipe 62. The annular pipe 61 is arranged adjacent to each other below the water distribution baffle 51, with the center of the annular pipe 61 concentric with the center of the water distribution baffle 51. One end of the PAM dosing pipe 62 is connected to the annular pipe 61. The upper side wall of the annular pipe 61 has multiple sets of outlets 63, the number of which corresponds to the number of water passage holes 511 and their positions are one-to-one. Each set of outlets 63 includes two outlets 63 arranged in a figure-eight pattern. The two outlets 63 in the same set are directly opposite the water-receiving strip 53 above. The specific implementation should be reasonably configured and selected based on engineering experience and CFD flow simulation.

[0063] The sedimentation tank 3 is equipped with a sludge scraper 31, an inclined tube 32, a flushing device 33, and a water collection tank 34. The inclined tube 32 is installed in the middle of the sedimentation tank 3, and the water collection tank 34 and the flushing device 33 are respectively located above and below the inclined tube 32. Wastewater, magnetic powder, magnetic sludge, and PAM are fully mixed under the action of the stirring structure inside the loading flocculation tank. The upward-lifting blades in the flocculation zone 22 can effectively prevent the exchange of liquids in the flocculation zone 22 and the loading zone 21 at the water distribution baffle 51. After the liquid in the flocculation zone 22 enters the sedimentation tank, it reaches the lower part of the sedimentation tank 3 under the action of the guide wall for solid-liquid separation. Some of the escaped solids are captured by the inclined tube 33, and the qualified clear water exits from the top of the sedimentation tank 3.

[0064] The magnetic powder recovery unit includes a magnetic powder recovery pump 71, a high shear machine 72, and a magnetic separator 73. The bottom outlet of the sedimentation tank 3 is connected to the inlet pipes of the magnetic powder recovery pump 71 and the magnetic mud return pump group 8, respectively. The outlet of the magnetic mud return pump group 8 is connected to the upper pipe of the magnetic powder loading channel.

[0065] Both the magnetic powder recovery pump 71 and the magnetic mud return pump are spiral centrifugal pumps. The inlet of the magnetic separator 73 is connected to the outlet pipeline of the magnetic powder recovery pump 71 through the high shear machine 72. The discharge port of the magnetic separator 73 is connected to the upper pipeline of the magnetic powder loading channel.

[0066] The sludge discharge unit includes a sludge storage tank 91 and a sludge discharge pump group 92. The sludge discharge pump is a slurry pump. The sludge discharge port of the magnetic separator 73 is connected to the pipeline of the sludge storage tank 91. The sludge discharge pump group 92 transports the sludge from the sludge storage tank 91 to the sludge dewatering workshop. The magnetic sludge settled at the bottom of the sedimentation tank 3 is collected into the intermediate sludge hopper by the scraper 31. Part of it enters the loading zone 21 through the magnetic sludge return pump group 8 and is guided by the baffle plate 4. The other part is recovered by the magnetic powder recovery unit. The recovered magnetic powder and the added magnetic powder enter the loading zone 21 through the baffle plate 4. The remaining sludge enters the sludge storage tank 91 and is transported to the sludge dewatering workshop by the sludge discharge pump 92.

[0067] Application Example 1: This utility model is applied to a wastewater treatment plant renovation project in Lijiang. The plant is designed to treat 30,000 m³ of wastewater. 3The project comprises two groups of high-density sedimentation tanks. The original high-density sedimentation tanks consisted of only one rapid mixing tank and two flocculation tanks, occupying a relatively small area. Through CFD simulation and design optimization, and considering the inlet and outlet methods of the original rapid mixing tanks, one of the original flocculation tanks was transformed into a loaded flocculation tank by adding a flow guide baffle, a water distribution device, and a PAM dispersion device. Simultaneously, the other flocculation tank was transformed into a sedimentation tank. The integrated loaded flocculation improved magnetic coagulation water treatment system disclosed in this invention, applied to this project, not only does not increase the land area but also reduces the civil engineering costs during the renovation process and lowers operating costs by 10-20%, demonstrating significant economic, environmental, and social benefits.

[0068] Application Example 2: This utility model is applied to a new wastewater treatment plant construction project in Qianxinan Prefecture. The plant is designed to treat 6000 m³ of wastewater. 3 / d, a total of two groups, a new magnetic coagulation sedimentation tank is built, and the improved magnetic coagulation water treatment system with integrated loading and flocculation disclosed in this utility model is adopted. The magnetic loading tank and flocculation tank are efficiently integrated into a loading and flocculation tank, reducing one tank body and one agitator. Compared with the conventional magnetic coagulation system, the footprint is reduced by about 20%, the operating cost is reduced by 10-20%, and the economic, environmental and social benefits are better than the conventional magnetic coagulation water treatment system.

[0069] The parts not mentioned in this utility model can be achieved by adopting or referencing existing technologies.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0071] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0072] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A modified magnetic coagulation water treatment system integrating loading and flocculation, characterized in that, It includes a rapid mixing tank, a loading flocculation tank, a sedimentation tank, a PAM dispersion device, a magnetic powder recovery unit, a magnetic mud return pump group, and a sludge discharge unit. The rapid mixing tank, the loading flocculation tank, and the sedimentation tank are arranged adjacent to each other. The rapid mixing tank has an inlet on one side and is connected to the loading flocculation tank through a water passage. The upper part of the loading flocculation tank is connected to the sedimentation tank. A stirrer is provided inside the rapid mixing tank, and a flow guide baffle is provided on the side of the loading flocculation tank near the rapid mixing tank. A magnetic powder loading channel is formed between the flow guide baffle and the side wall of the loading flocculation tank. A water distribution and guiding device is provided on the side of the flow guide baffle away from the rapid mixing tank. The water distribution and diversion device includes a water distribution baffle, a diversion baffle and a water-receiving strip. The water distribution baffle is located in the middle of the loading flocculation tank, dividing the interior of the loading flocculation tank into an upper flocculation zone and a lower loading zone. The water distribution baffle is provided with multiple water passage holes, and the loading zone is connected to the flocculation zone through the water passage holes. Each water passage hole is equipped with a flow guide baffle above it and a water-receiving strip on its inner side. The loading flocculation tank is equipped with a stirring mechanism. The stirring mechanism adopts a double-layer blade structure, with the two layers of blades located in the flocculation zone and the loading zone, respectively. The PAM dispersion device includes an annular pipe and a PAM dosing pipe. The annular pipe is arranged adjacent to each other below the water distribution baffle. One end of the PAM dosing pipe is connected to the annular pipe. The upper side wall of the annular pipe has multiple sets of outlets that are equal in number to the number of water passage holes and whose positions correspond one-to-one. The sedimentation tank is equipped with a sludge scraper, an inclined tube, a flushing device, and a water collection tank. The inclined tube is installed in the middle of the sedimentation tank, and the water collection tank and the flushing device are respectively located above and below the inclined tube.

2. The modified magnetic coagulation water treatment system with integrated loading and flocculation as described in claim 1, characterized in that, The inlet is located at the lower part of the side wall of the rapid mixing tank, and the water passage is located at the upper part of the side adjacent to the loading flocculation tank of the rapid mixing tank. The flow guide baffle is a square flat plate, which is vertically arranged on the side adjacent to the loading flocculation tank and the water passage. Its two ends are fixedly connected to the two opposite side walls of the loading flocculation tank. The water in the rapid mixing tank enters the loading area through the water passage and the magnetic powder loading channel. The corners of the sidewalls adjacent to the loading flocculation tank and the water passage tunnel and their bottom slabs are chamfered.

3. The modified magnetic coagulation water treatment system with integrated loading and flocculation as described in claim 1, characterized in that, The inlet is located on the upper part of the side wall of the rapid mixing tank, and the water passage is located on the lower part of the side adjacent to the loading flocculation tank of the rapid mixing tank. The flow guide baffle is an L-shaped bent plate, which is vertically arranged at a position corresponding to the water passage. The two ends of the flow guide baffle are fixedly connected to the two adjacent side walls of the loading flocculation tank, respectively. The water in the rapid mixing tank enters the loading zone through the water passage and below the flow guide baffle.

4. The modified magnetic coagulation water treatment system with integrated loading and flocculation as described in claim 1, characterized in that, The water distribution baffle is a horizontally arranged flat plate structure, and its outer edge is fixedly connected to the flow guide baffle and the side wall of the loading flocculation tank. The stirring mechanism includes a stirring shaft and a geared motor. The stirring shaft is sealed to the center of the water distribution baffle through a sealing sleeve. The upper blades are upward-lifting blades, and the lower blades are downward-pressing blades. The geared motor drives the two blades to rotate through the stirring shaft.

5. The modified magnetic coagulation water treatment system with integrated loading and flocculation as described in claim 1, characterized in that, All water passage holes are evenly arranged in a ring on the circumference with the center of the water distribution baffle as the center. The flow guide baffle is a square metal plate and is located directly above the corresponding water passage hole. The flow guide baffle is fixedly connected to the water distribution baffle through the bracket. The water-receiving strip is a strip-shaped metal sheet with rounded ends. Both ends are fixedly connected to the side wall of the water passage hole, and the water-receiving strip divides the water passage hole into two water passage channels.

6. The modified magnetic coagulation water treatment system with integrated loading and flocculation as described in claim 1, characterized in that, The annular pipe is circular and is arranged concentrically with the center of the water distribution baffle. The center lines of each water-receiving strip are arranged along the normal direction of the circumference of all water-passing holes. Each set of outlets includes two outlets arranged in a figure-eight pattern, with both outlets in the same set facing the water-receiving strip above.

7. The modified magnetic coagulation water treatment system with integrated loading and flocculation as described in claim 1, characterized in that, The magnetic powder recovery unit includes a magnetic powder recovery pump, a high shear machine, and a magnetic separator. The bottom outlet of the sedimentation tank is connected to the inlet pipes of the magnetic powder recovery pump and the magnetic mud return pump group, respectively. The outlet of the magnetic mud return pump group is connected to the upper pipe of the magnetic powder loading channel. Both the magnetic powder recovery pump and the magnetic mud return pump are spiral centrifugal pumps. The inlet of the magnetic separator is connected to the outlet pipeline of the magnetic powder recovery pump through a high shear machine, and the discharge port of the magnetic separator is connected to the upper pipeline of the magnetic powder loading channel.

8. The modified magnetic coagulation water treatment system with integrated loading and flocculation as described in claim 7, characterized in that, The sludge discharge unit includes a sludge temporary storage tank and a sludge discharge pump set. The sludge discharge pump is a slurry pump. The sludge discharge port of the magnetic separator is connected to the pipeline of the sludge temporary storage tank. The sludge discharge pump set transports the sludge from the sludge temporary storage tank to the sludge dewatering workshop.

9. The modified magnetic coagulation water treatment system with integrated loading and flocculation as described in claim 1, characterized in that, The rapid mixing tank is equipped with a PAC dosing pipe on its inner side, which is located on the side near the water inlet.

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