Decontamination and dehydration land-saving integrated treatment method

Abstract

The invention relates to the technical field of precipitation and sludge dewatering, in particular to a decontamination and dewatering land-saving integrated treatment method. When turbidity removal is taken as a treatment target, the system comprises a pretreatment and biological enhancement precipitation and dehydration integrated tank, a filter tank, a clean water tank, a drainage tank, a concentration tank and a pump room, when pollutants are removed as a treatment target, the device comprises a pretreatment tank, a biological enhancement precipitation and dehydration integrated tank, an ozone contact tank, an activated carbon adsorption tank, a filter tank, a clean water tank, a drainage tank, a concentration tank and a pump room, the biological enhancement precipitation and dehydration integrated pool comprises a main pool body, a sludge backflow dehydration machine room, a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe are matched, the main pool body comprises a mixing area, a lifting flocculation area, a transition area, a sludge-water separation area, a water outlet area, a sludge concentration area and a sludge storage area, and the main pool body and the sludge backflow dehydration machine room are jointly built to achieve precipitation and sludge dehydration functions. According to the invention, processes of efficient precipitation, sludge dewatering, biological enhancement and land-saving integration can be taken into consideration, so as to realize dual goals of deep purification of water quality and recycling of resources.

Description

Technical Field

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

[0002] In recent years, high-efficiency sedimentation technology has been rapidly popularized in the fields of water supply and drainage and special water treatment projects. 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 that need to be solved urgently in practical applications:

[0003] When cleaning and repairing the effluent area and sludge thickening area, the entire pool needs to be shut down, affecting normal production; the synergistic enhancement of biodegradation and coagulation sedimentation effect is insufficient, making it difficult to achieve efficient treatment of subsequent sludge thickening and dewatering simultaneously. On the other hand, for treatment processes aiming to remove low-valent ions and pollutants to meet the requirements of direct drinking or industrial needs, due to the long and complex process flow, large floor area, and low plot ratio, the cost of land acquisition accounts for a relatively high proportion in the construction investment, which has 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] The purpose of the present invention is to provide a decontamination, dewatering and land-saving integrated treatment method. With a 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 simultaneously 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] A decontamination, dewatering and land-saving integrated treatment method includes:

[0007] When the treatment target is turbidity removal, it includes pretreatment, a bio-enhanced sedimentation and dewatering integrated tank, a filter tank, a clear water tank, a drainage tank, a thickening tank, and a pump house;

[0008] When the treatment target is pollutant removal, it includes pretreatment, a bio-enhanced sedimentation and dewatering integrated tank, an ozone contact tank, an activated carbon adsorption tank, a filter tank, a clear water tank, a drainage tank, a thickening tank, and a pump house;

[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 area, a lifting and flocculation area, a transition area, a sludge-water separation area, an effluent area, a sludge thickening area, and a sludge storage area, and is built together with the sludge return and dewatering machine room to achieve the functions of sedimentation and sludge dewatering.

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

[0011] Furthermore, a coagulant adding point and a reclaimed water access point are arranged on the inlet pipe of the main tank body, a PAM coagulant aid adding point is arranged above the sludge return pipeline and the water-turning weir, and aeration pipelines are respectively arranged in the mixing and stirring area and the lifting and stirring area.

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

[0013] Furthermore, the sludge in the main tank body realizes an external circulation through the sludge storage area, and 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] Furthermore, the sludge storage area receives the sludge water discharged from the external thickening tank, the sludge discharged from the pool and the dewatered water of the sludge dewatering machine, realizing nearly zero discharge of wastewater.

[0015] Furthermore, the flushing wastewater of the filter tank and the activated carbon adsorption tank is discharged into the drainage tank and then lifted to the thickening tank for thickening. The supernatant of the thickening tank can be reused for the pretreatment of the raw water or connected to the inlet pipe of the bio-enhanced sedimentation and dewatering integrated tank.

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

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

[0018] The present invention relates to an integrated process for decontamination, dehydration 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 biological enhanced precipitation and dehydration integrated tank organically combines high-efficiency precipitation and sludge dehydration. The tank type layout is concentrated and compact, and there is a breakthrough in the large-scale of the single tank scale; the precipitation area is arranged in parallel through multiple channels, so that the other two grids can still discharge water when the single grid 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 coagulant aids, to achieve the purpose of high-efficiency precipitation; 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 dehydration measures, the sludge can be transported and disposed on-site or enter the deep drying process, achieving the purpose of low-carbon emission reduction. Brief Description of the Drawings

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

[0020] Figure 2 It is a schematic lower 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 the integrated process for decontamination, dehydration and land saving with turbidity removal as the treatment target;

[0025] Figure 7 It is a schematic diagram of the integrated process for decontamination, dehydration and land saving with pollutant removal as the treatment target.

[0026] Numbers of each part in the figure: 1, main pool body; 2, sludge return and dewatering machine room; 3, mixing area; 4, lifting and flocculation area; 5, transition area; 6, sludge-water separation area; 7, effluent area; 8, sludge thickening area; 9, sludge storage area; 10, influent pipe; 11, mixing agitator; 12, aeration pipeline in the mixing area; 13, overflow weir; 14, connecting channel; 15, lifting agitator; 16, draft tube; 17, aeration pipe in the lifting and flocculation area; 18, weir gate; 19, diversion baffle; 20, inclined tube; 21, effluent finger slot; 22, main effluent channel; 23, effluent pipe; 24, thickening sludge scraper; 25, sludge storage pit; 26, sludge discharge pipeline; 27, sludge return pipeline; 28, sludge dewatering and discharge pipeline; 29, propelling agitator; 30, sludge discharge lift pump; 31, return sludge lift pump; 32, return sludge pipeline; 33, influent pipe sludge injection pipeline; 34, sludge discharge lift pump; 35, sludge discharge pipeline; 36, dewatering machine influent pipeline; 37, sludge dewatering machine; 38, screw conveyor; 39, dewatered water discharge pipeline; 40, alum adding point; 41, PAM coagulant aid adding point; 42, external sludge access pipe; 43, reclaimed water access point.

[0027] 100, biological 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, supernatant of the thickening tank; 203, ecological water replenishment; 204, sludge discharge water. Specific 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 decontamination, dewatering and land-saving integrated treatment method, which is a land-saving integrated treatment process with a biological enhanced precipitation and dewatering integrated pond as the core, capable of directly drinking or meeting industrial requirements to remove low-valent ions and pollutants, and simultaneously realizing the functions of sludge thickening and dewatering and nearly zero discharge of wastewater.

[0030] Please refer to Figure 6, when the treatment target is turbidity removal, a decontamination, dehydration and land-saving integrated process mainly includes pretreatment 101, a biological enhanced sedimentation and dehydration integrated tank 100, a filter tank 102, a clear water tank 103, a drainage tank 200, a thickening tank 201, a pump house 104 and related auxiliary pipelines. It is characterized in that after the raw water 109 enters the biological enhanced sedimentation and dehydration integrated tank 100 through pretreatment 101 for sedimentation, the sedimented water enters the filter tank 102 for filtration, and the filtered water enters the clear water tank 103 after disinfection 106, and then is sent to the pipe network 105 or users after being lifted by the pump house 104. After the flushing wastewater of the filter tank 102 is discharged into the drainage tank 200, it is 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 the pretreatment 101 is carried out again, or is connected to the water inlet pipe 10 of the biological enhanced sedimentation and dehydration integrated tank 100. The sludge and water 204 discharged from the thickening tank 201 enters the sludge storage area 9 of the biological enhanced sedimentation and dehydration integrated tank 100 for joint treatment.

[0031] Please refer to Figure 7 , when the treatment target is pollutant removal, a decontamination, dehydration and land-saving integrated process mainly includes pretreatment 101, a biological enhanced sedimentation and dehydration integrated tank 100, an ozone contact tank 107, an activated carbon adsorption tank 108, a filter tank 102, a clear water tank 103, a drainage tank 200, a thickening tank 201, a pump house 104 and related auxiliary pipelines. It is characterized in that after the raw water 109 enters the biological enhanced sedimentation and dehydration integrated tank 100 through pretreatment 101 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, and the effluent enters the filter tank 102 for filtration. The filtered water enters the clear water tank 103 after disinfection 106, and then is sent to the pipe network 105 or users after being lifted by the pump house 104. After the flushing wastewater of the activated carbon adsorption tank 108 and the filter tank 102 is discharged into the drainage tank 200, it is 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 the pretreatment 101 is carried out again. The sludge and water 204 discharged from the thickening tank 201 enters the sludge storage area 9 of the biological enhanced sedimentation and dehydration integrated tank 100 for joint treatment.

[0032] Please refer to the biological enhanced sedimentation and dehydration integrated tank 100 shown in Fig. 1, as Figure 1As shown in the figure, the sedimentation tank mainly includes a main tank body 1 and a combined sludge return and dewatering machine room 2. The main tank body 1 consists 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 inside, and a water-turning weir 13 and a connecting channel 14 are provided to connect to 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 tank wall, and a weir gate 18 is provided to achieve closure. The transition zone 5 enters the sludge-water separation zone 6 through a diversion 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 consists 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 equipped 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 connects to the sludge dewatering facility through the sludge discharge pipeline 35 or discharges it externally through the sludge dewatering and discharge pipeline 28. A push-flow agitator 29 is arranged inside 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 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 injection 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 addition point 40 are arranged on the inlet pipe 10, and a PAM coagulant aid addition point 41 is arranged above the sludge return pipeline 32 and the water-turning 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 a variable-frequency motor, and a thickening grid bar is arranged at the bottom of the thickening sludge scraper 24.

[0033] The decontamination and dewatering operation process of the present invention is as follows: The effluent from the pretreatment 101 and the recycled water accessed at the recycled water access point 43 enter the mixing zone 3 of the main tank body 1 after adding alum 40 through the water inlet pipe 10 and adding sludge through the sludge return pipeline 32. After being mixed by the mixing agitator 11 and oxygenated through the aeration pipeline 12, it enters the draft tube 16 in the middle of the two-sided lifting and flocculation zone 4 through the water turning weir 13 and the connecting channel 14. After being lifted by the lifting agitator 15 and further oxygenated through the aeration pipeline 17, it realizes full mixing with the muddy water outside the draft tube 16. The effluent enters the transition zone 5 through the opening in the pool wall and enters the mud-water separation zone 6 along the diversion retaining wall 19. The mud-water separation zone 6 realizes mud-water diversion. The clear water flows upward successively through the inclined tube 20, the effluent finger-shaped groove 21, and the effluent main channel 22, and finally flows through the water outlet pipe 23 to the next treatment structure; the sludge enters the sludge storage pit 25 after being concentrated by the sludge thickening and scraping machine 24, and then is discharged into the sludge return and dewatering machine room 2 by the sludge outlet pipe 26 to the sludge lifting pump 30. After being lifted, it is discharged into the sludge storage area 9 through the sludge inlet pipeline 27. The sludge in the sludge storage area 9 can be discharged into the sludge return lift pump 31 through the sludge return pipeline 32. After adding PAM 41 and being lifted, it is discharged into the water inlet pipe 10 through the sludge injection pipeline 33; the sludge can also be discharged into the sludge discharge lift pump 34 through the sludge discharge pipeline 35. In case of emergency, it is discharged externally through the emergency discharge pipeline 28. Under normal circumstances, after being lifted, it enters the sludge dehydrator 37 for dehydration. The dehydrated sludge is discharged to the outdoor transport vehicle by the screw conveyor 38 for timely external transportation or enters the deep drying process. The dehydrated water is discharged up to standard through the discharge pipeline 39 or connected to the sludge storage area 9. The present invention organically combines high-efficiency sedimentation and sludge dewatering through the reasonable layout of the main tank body 1 and the sludge return and dewatering machine room 2. The pool type layout is concentrated and compact, and there is a breakthrough in the large-scale of a single pool; the transition zone 5, the mud-water separation zone 6, the effluent zone 7, the sludge thickening zone 8, and the sludge storage area 9 all adopt a multi-channel parallel layout, so as to ensure that normal production is not affected during daily cleaning and maintenance; the biological action in the pool is strengthened by oxygenation through the aeration pipelines 12 and 17, and combined with the multi-point dosing of alum 40 and PAM 41 to achieve the purpose of high-efficiency sedimentation; the sludge in the pool can be controllably discharged through the sludge storage area 9, which can ensure the concentration of sludge return and is easier to control; through the combination of dehydration measures, the external transportation and disposal of sludge or further deep drying are realized locally, so as to achieve the purpose of low-carbon emission reduction. The sludge storage area 9 receives the drained muddy water 204 from the external thickening tank 201, the internal sludge discharge, and the dehydrated water from the dehydrator, realizing nearly zero discharge of wastewater.

[0034] It can be understood that the pretreatment 101, the ozone contact tank 107, the activated carbon adsorption tank 108, the filter tank 102, the clear water tank 103, the drainage tank 200, the thickening tank 201, and the pump house 104 are all prior arts and will not be described further.

[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 shall be subject to the protection scope of the claims described above.

Claims

1. A decontamination, dehydration and land-saving integrated treatment method, characterized in that Comprising: When the treatment target is turbidity removal, it includes a pretreatment unit (101), a biological enhanced sedimentation and dewatering integrated tank (100), a filter tank (102), a clear water tank (103), a drainage tank (200), a thickening tank (201), and a pump house (104); When the treatment target is pollutant removal, it 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 clear water tank (103), a drainage tank (200), a thickening tank (201), and a pump house (104); The biological enhanced sedimentation and dewatering integrated tank (100) includes a main tank body (1), a sludge return and dewatering machine room (2), and a supporting water inlet pipe (10) and a water outlet pipe (23). The main tank body (1) includes a mixing zone (3), a lifting and flocculation zone (4), a transition zone (5), a sludge-water separation zone (6), a water outlet zone (7), a sludge thickening zone (8), and a sludge storage zone (9), and is built together with the sludge return and dewatering machine room (2) to realize the functions of sedimentation and sludge dewatering.

2. The decontamination, dehydration and land-saving integrated treatment method according to claim 1, wherein The mixing zone (3) is connected to the water inlet pipe (10) at the bottom, is internally provided with a mixing agitator (11) and an air distribution pipeline (12), and is provided with an overflow weir (13) and a connecting channel (14) leading to the middle of the lifting and flocculation zone (4); the lifting and flocculation zone (4) is internally provided with a lifting agitator (15), a draft tube (16), and an air distribution pipe (17), is connected to the transition zone (5) through an opening in the pool wall, and is provided with a weir gate (18) to be closable; 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 water outlet zone (7) and the lower sludge thickening zone (8). The upper water outlet zone (7) includes inclined tubes (20), water outlet finger-shaped grooves (21), and a water outlet main channel (22), and the water outlet main channel (22) is connected to the water 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), and returns the sludge to the water inlet pipe (10) through a sludge return pipeline (32), or accesses the sludge dewatering facility or discharges it externally through a sludge discharge pipeline (35); a push-flow agitator (29) is arranged inside the sludge storage zone (9).

3. The decontamination, dehydration and land-saving integrated treatment method according to claim 1, characterized in that A coagulant adding dosing point (40) and a reclaimed water access point (43) are arranged on the water inlet pipe (10) of the main tank body (1). A PAM coagulant aid dosing point (41) is arranged above the sludge return pipeline (32) and the overflow weir (13). Air distribution pipelines are respectively arranged in the mixing and stirring zone (3) and the lifting and stirring zone (4).

4. The decontamination, dehydration and land-saving integrated treatment method according to claim 1, characterized in that, The transition zone (5), the sludge-water separation zone (6), the water outlet zone (7), the sludge thickening zone (8), and the sludge storage zone (9) are all arranged in parallel with multiple channels. When any channel is under maintenance or cleaning, the remaining channels remain in normal operation.

5. The decontamination, dehydration and land-saving integrated treatment method according to claim 1, wherein, The sludge in the main pond body (1) realizes an external circulation through the sludge storage area (9), so that the sludge reflux and the sludge external discharge and dehydration processes are independently controllable; a sludge dehydrator (37) and a screw conveyor (38) are arranged in the sludge reflux and dehydration machine room (2) for sludge dehydration.

6. The decontamination, dehydration and land-saving integrated treatment method according to claim 1, wherein The sludge storage area (9) receives the sludge water (204) discharged from the external thickener (201), the sludge discharged in the pond, and the dewatered water of the sludge dehydrator (37), so as to achieve nearly zero discharge of wastewater.

7. The decontamination, dehydration and land-saving integrated treatment method according to claim 1, characterized in that After the flushing wastewater of the filter tank (102) and the activated carbon adsorption tank (108) is discharged into the drainage tank (200), it is lifted to the thickener (201) for thickening. The supernatant (202) of the thickener (201) can be reused to the raw water (109) to enter the pretreatment unit (101) or be connected to the water inlet pipe (10) of the biological enhanced precipitation and dehydration integrated pond (100).

8. The decontamination, dehydration and land-saving integrated treatment method according to claim 1, characterized in that The sludge water (204) discharged from the thickener (201) enters the sludge storage area (9) of the biological enhanced precipitation and dehydration integrated pond (100) for combined treatment.

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