Deep purification sludge dewatering land-saving integrated treatment method

Abstract

The invention relates to the technical field of precipitation and sludge dewatering, in particular to a land-saving integrated treatment method for deep purification and sludge dewatering. When low-valence ions are removed as a treatment target, the device comprises a pretreatment unit, a biological enhancement precipitation and dehydration integrated tank, a filter tank, a microfiltration or ultrafiltration unit, a nanofiltration or reverse osmosis unit, a clean water tank, a drainage tank, a concentration tank, a pump room and related auxiliary pipelines, when low-valence ions and frequently-appearing organic pollutants are removed as a treatment target, the device comprises a pretreatment unit, a biological enhancement precipitation and dehydration integrated tank, an ozone contact tank, an activated carbon adsorption tank, a filter tank, a microfiltration or ultrafiltration unit, a nanofiltration or reverse osmosis unit, a clean water tank, a drainage tank, a concentration tank, a pump room and related auxiliary pipelines. The deep purification sludge dewatering land-saving integrated treatment method can integrate the processes of efficient precipitation, sludge dewatering, biological enhancement and land-saving integration, so as to realize deep purification of water quality and cyclic utilization of resources.

Description

Technical Field

[0001] The present invention relates to the technical field of sedimentation and sludge dewatering, and specifically to a method for integrated treatment of deep purification of sludge dewatering and land saving. Background Art

[0002] In recent years, the high-efficiency sedimentation technology has been rapidly popularized in the fields of water supply and drainage and special water treatment engineering. Compared with traditional tank types such as horizontal flow sedimentation tanks, mechanical agitation clarifiers, and inclined tube sedimentation tanks, it has significant advantages such as small floor area, high treatment load, and high sludge concentration. However, there are still technical bottlenecks to be solved in practical applications:

[0003] When cleaning and repairing the effluent area and sludge thickening area, the whole tank needs to stop water supply, which affects normal production; the synergistic enhancement of biodegradation and coagulation sedimentation effect is insufficient, and it is difficult to achieve efficient treatment of subsequent sludge thickening and dewatering synchronously. On the other hand, the treatment process for removing low-valent ions and pollutants aiming to meet the requirements of direct drinking or industrial use has a long and complex process flow, large floor area, and low floor area ratio, resulting in a relatively high proportion of land acquisition costs in the construction investment. This problem has also long troubled the development of the industry. The existence of the above technical defects requires a process that can take into account high-efficiency sedimentation, sludge dewatering, biological enhancement, and land-saving integration to achieve the dual goals of deep water purification and resource recycling. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide an integrated process for deep purification of sludge dewatering and land saving. With the bio-enhanced sedimentation and dewatering integrated tank as the core, a land-saving layout is carried out, which can give full play to the biodegradation effect to improve the removal of organic matter and other indicators by the sedimentation tank, thereby further optimizing the coagulation sedimentation effect, and synchronously realizing the external circulation of sludge and the dehydration treatment of production wastewater, achieving the purpose of low-carbon emission reduction and nearly zero wastewater discharge.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An integrated treatment method for deep purification of sludge dewatering and land saving:

[0007] When the treatment target is to remove low-valent ions, it includes a pretreatment unit, a bio-enhanced sedimentation and dewatering integrated tank, a filter tank, a microfiltration or ultrafiltration unit, a nanofiltration or reverse osmosis unit, a clear water tank, a drainage tank, a thickening tank, a pump house, and related auxiliary pipelines;

[0008] When the treatment targets are to remove low-valent ions and frequently occurring organic pollutants, it includes a pretreatment unit, a bio-enhanced sedimentation and dewatering integrated tank, an ozone contact tank, an activated carbon adsorption tank, a filter tank, a microfiltration or ultrafiltration unit, a nanofiltration or reverse osmosis unit, a clear water tank, a drainage tank, a thickening tank, a pump house, and related auxiliary pipelines;

[0009] The bio-enhanced sedimentation and dewatering integrated tank includes a main tank body, a sludge return and dewatering machine room, and supporting inlet and outlet pipes. The main tank body includes a mixing zone, a lifting and flocculation zone, a transition zone, a sludge-water separation zone, an effluent zone, a sludge thickening zone, and a sludge storage zone, and is built together with the sludge return and dewatering machine room to realize the functions of sedimentation and sludge dewatering.

[0010] Further, the mixing zone is connected to the inlet pipe at the bottom, is equipped with a mixing agitator and an aeration pipeline inside, and is provided with a water-turning weir and a connecting channel to access the middle of the lifting and flocculation zone; the lifting and flocculation zone is equipped with a lifting agitator, a draft tube and an aeration pipeline, is connected to the transition zone through an opening in the pool wall, and is provided with a weir gate to be closable; the transition zone enters the sludge-water separation zone through a flow guiding baffle wall; the sludge-water separation zone is located between the upper effluent zone and the lower sludge thickening zone. The upper effluent zone includes inclined tubes, effluent finger-shaped grooves and an effluent main channel, and the effluent main channel is connected to the outlet pipe; the lower sludge thickening zone is provided with a thickening sludge scraper and a sludge storage pit, and the sludge storage pit is connected to the sludge discharge pipeline; the sludge storage zone is arranged outside the mixing zone and the lifting and flocculation zone, receives the sludge discharged from the sludge storage pit, and returns the sludge to the inlet pipe through the sludge return pipeline, or accesses the sludge dewatering facility or discharges it externally through the sludge discharge pipeline; a push-flow agitator is arranged inside the sludge storage zone.

[0011] Further, a ferric sulfate dosing point and a recycled water access point are arranged on the inlet pipe of the main tank body, a PAM coagulant aid dosing point is arranged above the sludge return pipeline and the water-turning weir, and aeration pipelines are respectively arranged in the mixing and stirring zone and the lifting and stirring zone.

[0012] Further, the transition zone, the sludge-water separation zone, the effluent zone, the sludge thickening zone and the sludge storage zone are all arranged in parallel with multiple channels. When any channel is under maintenance or cleaning, the other channels keep normal operation.

[0013] Further, the sludge in the main tank body realizes an external circulation through the sludge storage zone, so that the sludge return and sludge external discharge dewatering processes are independently controllable; a sludge dewatering machine and a screw conveyor are arranged in the sludge return and dewatering machine room for sludge dewatering.

[0014] Further, the sludge storage zone receives the sludge water discharged from the external thickening tank, the sludge discharged from the tank and the dewatered water of the sludge dewatering machine, realizing nearly zero discharge of wastewater.

[0015] Further, after the flushing wastewater of the activated carbon adsorption tank, the filter tank, the microfiltration or ultrafiltration unit and the nanofiltration or reverse osmosis unit is discharged into the drainage tank, it is lifted and sent to the thickening tank for thickening. The supernatant of the thickening tank can be discharged into the river as ecological makeup water, or can be discharged to the raw water for mixing, re-entering the pretreatment unit, or accessing the inlet pipe of the bio-enhanced sedimentation and dewatering integrated tank.

[0016] Further, the sludge water discharged from the thickening tank enters the sludge storage area of the integrated biological enhanced sedimentation and dewatering tank for combined treatment.

[0017] The present invention has the following beneficial technical effects:

[0018] The present invention relates to an integrated process for deep purification of sludge dewatering and land saving, which combines the sludge treatment process with the water purification treatment process. The overall layout is compact and the land saving effect is remarkable. Among them, the integrated biological enhanced sedimentation and dewatering tank organically combines high-efficiency sedimentation and sludge dewatering. The tank type layout is concentrated and compact, and there is a breakthrough in the large-scale of a single tank; the sedimentation area is arranged in parallel through multiple channels, so that the other two cells can still discharge water when the single-cell water outlet area and the sludge thickening area are cleaned and maintained, without affecting normal production; the biological action in the tank is strengthened by aeration through the aeration pipeline, combined with the multi-point dosing of coagulation and flocculation aids, to achieve the purpose of high-efficiency sedimentation; the sludge in the tank is controllably discharged through the sludge storage area, which can ensure the concentration of sludge reflux and is easier to control; through the combination with the dewatering measures, the sludge can be transported and disposed on-site or enter the deep drying process, so as to achieve the purpose of low-carbon emission reduction. Description of the Drawings

[0019] Figure 1 It is a schematic upper-layer plan view of an embodiment of the present invention;

[0020] Figure 2 It is a schematic lower-layer plan view of an embodiment of the present invention;

[0021] Figure 3 It is a sectional view along the Figure 1 A-A line in

[0022] Figure 4 It is a sectional view along the Figure 1 B-B line in

[0023] Figure 5 It is a sectional view along the Figure 2 C-C line in

[0024] Figure 6 It is a schematic diagram of an integrated process for deep purification of sludge dewatering and land saving with the treatment target of removing low-valence ions;

[0025] Figure 7 It is a schematic diagram of an integrated process for deep purification of sludge dewatering and land saving with the treatment targets of removing low-valence ions and frequently occurring organic pollutants.

[0026] 1. Main pool body; 2. Sludge return and dewatering machine room; 3. Mixing area; 4. Lift and flocculation area; 5. Transition area; 6. Mud-water separation area; 7. Effluent area; 8. Sludge thickening area; 9. Sludge storage area; 10. Inlet pipe; 11. Mixing agitator; 12. Mixing area aeration pipeline; 13. Overflow weir; 14. Connecting channel; 15. Lift agitator; 16. Draft tube; 17. Lift and flocculation area aeration pipe; 18. Weir gate; 19. Flow guiding baffle; 20. Inclined tube; 21. Effluent finger trough; 22. Effluent main channel; 23. Outlet pipe; 24. Thickening sludge scraper; 25. Mud storage pit; 26. Mud discharge pipeline; 27. Sludge return pipeline; 28. Sludge dewatering and discharge pipeline; 29. Pushing flow agitator; 30. Mud discharge lift pump; 31. Return sludge lift pump; 32. Return sludge pipeline; 33. Inlet pipe sludge injection pipeline; 34. Sludge discharge lift pump; 35. Sludge discharge pipeline; 36. Dewatering machine inlet mud pipeline; 37. Sludge dewatering machine; 38. Screw conveyor; 39. Dewatered water discharge pipeline; 40. Alum adding dosing point; 41. PAM coagulant aid dosing point; 42. External sludge access pipe; 43. Reclaimed water access point.

[0027] 100. Bio-enhanced precipitation and dewatering integrated pond; 101. Pretreatment unit; 102. Filter tank; 103. Clear water tank; 104. Pump house; 105. Pipe network; 106. Disinfection unit; 107. Ozone contact tank; 108. Activated carbon adsorption tank; 109. Raw water; 200. Drainage tank; 201. Thickening tank; 202. Thickening tank supernatant; 203. Ecological water replenishment; 204. Sludge discharge water; 300. Microfiltration or ultrafiltration unit; 301. Nanofiltration or reverse osmosis unit; Detailed implementation manners

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] The present invention provides a method for integrated treatment of deep purification, sludge dewatering and land saving, which takes the bio-enhanced precipitation and dewatering integrated pond as the core to directly remove low-valent ions and pollutants for drinking or industrial needs, and simultaneously realizes the land-saving integrated treatment process with the functions of sludge thickening and dewatering and nearly zero discharge of wastewater.

[0030] Please refer to Figure 6, when the treatment target is to remove low-valence ions, a deep purification and land-saving integrated process for sludge dewatering mainly includes a pretreatment unit 101, a biological enhanced sedimentation and dewatering integrated tank 100, a filter tank 102, a microfiltration or ultrafiltration unit 300, a nanofiltration or reverse osmosis unit 301, a clear water tank 103, a drainage tank 200, a thickening tank 201, a pump house 104 and related auxiliary pipelines. After the raw water 109 passes through the pretreatment unit 101 and enters the biological enhanced sedimentation and dewatering integrated tank 100 for sedimentation, the sedimented water enters the filter tank 102 for filtration. After the filtered water passes through the microfiltration or ultrafiltration unit 300, the low-valence ions are removed through the nanofiltration or reverse osmosis unit 301, and then enter the clear water tank 103 after disinfection 106, and then are sent to the pipe network 105 or users after being lifted by the pump house 104. The flushing wastewater from the filter tank 102, the microfiltration or ultrafiltration unit 300, and the nanofiltration or reverse osmosis unit 301 is discharged into the drainage tank 200 and then lifted and sent to the thickening tank 201 for thickening. The supernatant 202 of the thickening tank can be discharged into the river as ecological makeup water 203, or can be discharged to the raw water 109 for mixing, and then re-enter the pretreatment unit 101, or be connected to the inlet pipe 10 of the biological enhanced sedimentation and dewatering integrated tank 100. The sludge water 204 discharged from the thickening tank 201 enters the sludge storage area 9 of the biological enhanced sedimentation and dewatering integrated tank 100 for combined treatment.

[0031] Please refer to Figure 7 , when the treatment targets are to remove low-valence ions and frequently occurring organic pollutants, it mainly includes a pretreatment unit 101, a biological enhanced sedimentation and dewatering integrated tank 100, an ozone contact tank 107, an activated carbon adsorption tank 108, a filter tank 102, a microfiltration or ultrafiltration unit 300, a nanofiltration or reverse osmosis unit 301, a clear water tank 103, a drainage tank 200, a thickening tank 201, a pump house 104 and related auxiliary pipelines. After the raw water 109 passes through the pretreatment unit 101 and enters the biological enhanced sedimentation and dewatering integrated tank 100 for sedimentation, the sedimented water enters the ozone contact tank 107 and then enters the activated carbon adsorption tank 108 to remove some organic matters. The effluent enters the filter tank 102 for filtration. After the filtered water passes through the microfiltration or ultrafiltration unit 300, the low-valence ions are removed through the nanofiltration or reverse osmosis unit 301, and then enter the clear water tank 103 after disinfection 106, and then are sent to the pipe network 105 or users after being lifted by the pump house 104. The flushing wastewater from the activated carbon adsorption tank 108, the filter tank 102, the microfiltration or ultrafiltration unit 300 and the nanofiltration or reverse osmosis unit 301 is discharged into the drainage tank 200 and then lifted and sent to the thickening tank 201 for thickening. The supernatant 202 of the thickening tank 201 can be discharged into the river as ecological makeup water 203, or can be discharged to the raw water 109 for mixing and then re-enter the pretreatment unit 101. The sludge water 204 discharged from the thickening tank 201 enters the sludge storage area 9 of the biological enhanced sedimentation and dewatering integrated tank 100 for combined treatment.

[0032] Please refer to one of the biological enhanced precipitation and dewatering integrated ponds 100 shown in Figure 1. This sedimentation pond mainly includes a main pond body 1 and a co-constructed sludge return and dewatering machine room 2. The main pond body 1 is composed of a mixing zone 3, a lifting and flocculation zone 4, a transition zone 5, a sludge-water separation zone 6, an effluent zone 7, a sludge thickening zone 8, and a sludge storage zone 9. The mixing zone 3 is connected to the inlet pipe 10 at the bottom, and is equipped with a mixing agitator 11 and an aeration pipeline 12, and is provided with an overflow weir 13 and a connecting channel 14 to access the middle of the lifting and flocculation zone 4. The lifting and flocculation zone 4 is equipped with a lifting agitator 15, a draft tube 16, and an aeration pipe 17, and is connected to the transition zone 5 through an opening in the pool wall, and is provided with a weir gate 18 to achieve closure. The transition zone 5 enters the sludge-water separation zone 6 through a flow guiding baffle 19. The sludge-water separation zone 6 is located between the upper effluent zone 7 and the lower sludge thickening zone 8. The upper effluent zone 7 is composed of inclined tubes 20, effluent finger-shaped grooves 21, and an effluent main channel 22. The effluent main channel 22 is connected to the outlet pipe 23; the lower sludge thickening zone 8 is provided with a thickening sludge scraper 24 and a sludge storage pit 25, and the sludge storage pit 25 is connected to the sludge discharge pipeline 26. The sludge storage zone 9 is arranged outside the mixing zone 3 and the lifting and flocculation zone 4, receives the sludge discharged from the sludge storage pit 25, receives external thickened sludge through the external sludge access pipe 42, and returns the sludge to the inlet pipe 10 through the sludge return pipeline 32, or accesses the sludge dewatering facility through the sludge discharge pipeline 35 or is discharged externally through the sludge dewatering and discharge pipeline 28. A push-flow agitator 29 is arranged in the sludge storage zone 9. The lower part outside the mixing zone 3 and the lifting and flocculation zone 4 is the sludge return and dewatering machine room 2, which is provided with an inlet pipe 10, a sludge storage pit sludge discharge pipeline 26 connected to the sludge discharge lift pump 30, a sludge storage zone inlet pipeline 27, a sludge storage zone 9 sludge return pipeline 32 and an inlet pipe sludge dosing pipeline 33 connected to the sludge return lift pump 31, a sludge storage zone 9 sludge discharge pipeline 35 and a dehydrator inlet 36 or an emergency discharge pipeline 28, a sludge dehydrator 37, and a supporting screw conveyor 38 and a dehydrated water discharge pipeline 39. A reclaimed water access point 43 and a coagulant adding point 40 are arranged on the inlet pipe 10. A PAM coagulant aid adding point 41 is arranged above the sludge return pipeline 32 and the overflow weir 13. The above-mentioned lifting agitator 15, sludge discharge lift pump 30, sludge return lift pump 31, and sludge discharge lift pump 34 are all connected to variable-frequency motors, and concentrated grid bars are arranged at the bottom of the thickening sludge scraper 24.

[0033] The operation process of deep purification sludge dewatering is as follows: the effluent from the pretreatment unit 101 and the recycled water access point 43 are added with alum 40 through the water inlet pipe 10 and mud through the return mud pipeline 32, and then enter the mixing zone 3 of the main pool body 1, after being mixed by the mixing mixer 11 and oxygenated by the aeration pipeline 12, they enter the diversion barrel 16 in the middle of the lifting flocculation zone 4 on both sides through the water turning weir 13 and the connecting channel 14, and after being lifted by the lifting mixer 15 and further oxygenated by the aeration pipeline 17, they are fully mixed with the mud and water outside the diversion barrel 16, and the effluent enters the transition zone 5 through the opening of the pool wall, and enters the mud and water separation zone 6 along the diversion retaining wall 19. The mud and water separation area 6 realizes mud and water diversion, and the clean water goes up through the inclined pipe 20, the water outlet finger trough 21 and the water outlet main channel 22, and finally flows to the next treatment structure through the water outlet pipe 23; the sludge is concentrated by the thickening scraper 24 and enters the mud storage pit 25, and then discharged from the mud outlet pipe 26 into the mud outlet lifting pump 30 in the sludge return dewatering room 2, and after lifting, it is discharged into the sludge storage area 9 through the mud inlet pipeline 27. The sludge in the sludge storage area 9 can be discharged into the return sludge lifting pump 31 through the return sludge pipeline 32, and after adding PAM41 and lifting, it can be discharged into the water inlet pipe 10 through the sludge filling pipeline 33; the sludge can also be discharged into the sludge lifting pump 34 through the sludge discharge pipeline 35, and discharged outside through the emergency discharge pipeline 28 in an emergency. Under normal circumstances, it enters the sludge dewatering machine 37 for dehydration after lifting. The sludge is discharged by the screw conveyor 38 to the outdoor transport vehicle for timely transportation or enters the deep drying process. The sludge water is discharged through the discharge pipeline 39 to meet the standards or connected to the sludge storage area 9. The present invention combines efficient sedimentation and sludge dehydration organically through the reasonable arrangement of the main tank body 1 and the sludge return dehydration room 2. The tank type arrangement is concentrated and compact, and a breakthrough is made in the large-scale single tank. The transition zone 5, the mud-water separation zone 6, the water outlet zone 7, the sludge concentration zone 8 and the sludge storage zone 9 are all arranged in parallel with multiple channels, so that normal production is not affected during daily cleaning and maintenance. The biological action in the tank is strengthened by oxygenation through the aeration pipelines 12 and 17, and the multi-point addition of alum 40 and PAM 41 is combined to achieve the purpose of efficient sedimentation. The sludge in the tank is controlled to be discharged through the sludge storage zone 9, which can ensure the concentration of the sludge return and is easier to control. By combining with dehydration measures, the sludge can be transported and disposed of on site or further deeply dried, so as to achieve the purpose of low carbon emission reduction. The sludge storage zone 9 receives the sludge water 204 of the external concentration tank 201, the sludge in the tank and the dehydrator water, so as to achieve near-zero discharge of wastewater.

[0034] It is understandable that the pretreatment unit 101, the ozone contact tank 107, the activated carbon adsorption tank 108, the filter tank 102, the microfiltration or ultrafiltration unit 300, the nanofiltration or reverse osmosis unit 301, the clean water tank 103, the drainage tank 200, the concentration tank 201, and the pump room 104 are all prior arts and will not be described again.

[0035] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims described above.

Claims

1. A deep purification sludge dehydration and land-saving integrated treatment method, characterized in that: When the treatment target is to remove low-valent ions, the system comprises a pretreatment unit (101), a bio-enhanced sedimentation and dehydration integrated tank (100), a filter tank (102), a microfiltration or ultrafiltration unit (300), a nanofiltration or reverse osmosis unit (301), a clean water tank (103), a drainage tank (200), a concentration tank (201), a pump room (104), and related auxiliary pipelines; When the treatment target is to remove low-valent ions and frequently occurring organic pollutants, the system comprises a pretreatment unit (101), a bio-enhanced sedimentation and dehydration integrated tank (100), an ozone contact tank (107), an activated carbon adsorption tank (108), a filter tank (102), a microfiltration or ultrafiltration unit (300), a nanofiltration or reverse osmosis unit (301), a clean water tank (103), a drainage tank (200), a concentration tank (201), a pump room (104) and related auxiliary pipelines; The bio-enhanced sedimentation and dewatering integrated pool (100) comprises a main pool body (1), a sludge return dewatering room (2), and a matching water inlet pipe (10) and a water outlet pipe (23), wherein the main pool body (1) comprises a mixing area (3), a lifting and flocculation area (4), a transition area (5), a mud-water separation area (6), a water outlet area (7), a sludge concentration area (8), and a sludge storage area (9), and is built together with the sludge return dewatering room (2) to achieve sedimentation and sludge dewatering functions.

2. The deep purification sludge dehydration and land-saving integrated treatment method according to claim 1 is characterized in that: The mixing zone (3) is connected to the water inlet pipe (10) at the bottom, and is provided with a mixing mixer (11) and an aeration pipeline (12), and is provided with a water weir (13) and a connecting channel (14) to connect to the middle of the lifting and flocculation zone (4); the lifting and flocculation zone (4) is provided with a lifting mixer (15), a diversion bucket (16) and an aeration pipe (17), and is connected to the transition zone (5) through a pool wall opening, and is provided with a weir-type gate (18) to achieve closure; the transition zone (5) enters the mud-water separation zone (6) through a diversion baffle (19); the mud-water separation zone (6) is located between the upper water outlet zone (7) and the lower sludge concentration zone (8), and the upper water outlet zone (7) ) comprises an inclined pipe (20), a water outlet finger-shaped groove (21) and a water outlet main channel (22), wherein the water outlet main channel (22) is connected to a water outlet pipe (23); a lower sludge thickening zone (8) is provided with a thickening scraper (24) and a sludge storage pit (25), wherein the sludge storage pit (25) is connected to a sludge outlet pipeline (26); a sludge storage zone (9) is provided outside the mixing zone (3) and the lifting and flocculation zone (4), which receives sludge discharged from the sludge storage pit (25) and returns the sludge to the water inlet pipe (10) through a sludge return pipeline (32), or connects to a sludge dewatering facility or discharges it to the outside through a sludge discharge pipeline (35); a plug flow mixer (29) is provided inside the sludge storage zone (9).

3. The deep purification sludge dehydration and land-saving integrated treatment method according to claim 1 is characterized by: The water inlet pipe (10) of the main tank body (1) is provided with an alum addition point (40) and a recycled water access point (43); the return mud pipeline (32) and the upper part of the water weir (13) are provided with a PAM coagulant injection point (41); and the mixing and stirring zone (3) and the lifting and stirring zone (4) are respectively provided with aeration pipelines.

4. The deep purification sludge dehydration and land-saving integrated treatment method according to claim 1 is characterized by: The transition zone (5), mud-water separation zone (6), water outlet zone (7), sludge concentration zone (8) and sludge storage zone (9) are all arranged in parallel with multiple channels, so that when any channel is repaired or cleaned, the other channels maintain normal operation.

5. The deep purification sludge dehydration and land-saving integrated treatment method according to claim 1 is characterized by: The sludge in the main tank body (1) is circulated extracorporeally through the sludge storage area (9), so that the sludge return and sludge discharge dehydration processes are independently controllable; a sludge dehydrator (37) and a screw conveyor (38) are arranged in the sludge return dehydration room (2) for sludge dehydration.

6. The deep purification sludge dehydration and land-saving integrated treatment method according to claim 1 is characterized by: The sludge storage area (9) receives the sludge water (204) from the external thickening tank (201), the sludge in the tank and the dewatering water from the sludge dewatering machine (37), thereby achieving near-zero wastewater discharge.

7. The deep purification sludge dehydration and land-saving integrated treatment method according to claim 1 is characterized by: After the flushing wastewater from the activated carbon adsorption tank (108), the filter tank (102), the microfiltration or ultrafiltration unit (300) and the nanofiltration or reverse osmosis unit (301) is discharged into the drainage tank (200), it is lifted and sent to the concentration tank (201) for concentration. The supernatant (202) of the concentration tank (201) can be discharged into the river as ecological water replenishment (203), or discharged to the raw water (109) for mixing, and then re-enter the pretreatment unit (101), or connected to the water inlet pipe (10) of the biological enhanced sedimentation and dehydration integrated tank (100).

8. The deep purification sludge dehydration and land-saving integrated treatment method according to claim 1 is characterized by: The sludge water (204) discharged from the concentration tank (201) enters the sludge storage area (9) of the biological enhanced sedimentation and dehydration integrated tank (100) for treatment.

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