Bioaugmentation precipitation and dehydration integrated pool

Abstract

The invention relates to the technical field of sedimentation and sludge dewatering, in particular to a biologically enhanced sedimentation and dewatering integrated pool, which synchronously realizes efficient sedimentation of water treatment and land-saving and consumption-reducing arrangement of a concentration-storage-backflow or dewatering process of sludge. Comprising a main tank body, a sludge backflow dewatering machine room and matched pipelines, and the main tank body comprises a plurality of areas such as a mixing area and a lifting flocculation area and is further provided with an aeration pipeline. The integrated tank has obvious advantages, organically combines efficient precipitation and sludge dewatering, is compact in tank type, and is beneficial to large scale of a single tank. Multiple channels in the settling zone are connected in parallel, and single-cell maintenance does not affect production. The aeration pipeline is oxygenated to strengthen the biological effect, and efficient precipitation is realized in cooperation with multi-point dosing of medicaments. Sludge in the pond is controllably discharged through the sludge storage area, the sludge backflow concentration is guaranteed, and control is convenient. And in combination with dehydration measures, sludge is treated on site, so that the purposes of low carbon emission reduction, land saving and consumption reduction are achieved. The sludge storage area is used for receiving external concentrated sludge, sludge discharged in the tank and dehydrated water of the dehydrator, so that near-zero discharge of wastewater is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sedimentation and sludge dewatering, and more specifically, to an integrated biological enhanced sedimentation and dewatering tank. Background Art

[0002] In recent years, high-efficiency sedimentation technology has been widely applied in the fields of water supply and drainage and special water treatment. Compared with traditional sedimentation tanks, it has the advantages of small floor area, high treatment load, and high sludge concentration. However, there are still the following key problems

[0003] During the sludge return process, it is difficult to accurately control parameters such as sludge concentration and activity, resulting in unstable coagulation sedimentation effects, especially limited removal efficiency of pollutants such as organic matter. The water outlet area and sludge thickening area of existing tank types are mostly single-channel structures. When cleaning or maintaining, the whole water supply needs to be stopped, seriously affecting continuous production. The sludge thickening and dewatering links are separated, resulting in low dewatering efficiency, high water content, and the dewatered water cannot be recycled, making it difficult to achieve near-zero wastewater discharge. Therefore, there is an urgent need for a new type of sedimentation tank that integrates biological enhancement, external sludge circulation, multi-channel operation and maintenance, and dewatering to solve the limitations of existing technologies. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated biological enhanced sedimentation and dewatering tank, which can give full play to the biological degradation effect to improve the removal of indicators such as organic matter by the high-efficiency sedimentation tank, thereby further optimizing the coagulation sedimentation effect, and realizing the external circulation and dewatering treatment of sludge, achieving the purpose of low-carbon emission reduction and near-zero wastewater discharge.

[0005] To achieve the above purpose, the technical solution of the present invention is:

[0006] An integrated biological enhanced sedimentation and dewatering tank includes a main tank body and a jointly constructed sludge return and dewatering machine room. The main tank body includes a mixing area, a lifting and flocculation area, a transition area, a mud-water separation area, a water outlet area, a sludge thickening area, and a sludge storage area. Among them, the mixing area is connected to the water inlet pipe, the water outlet area is connected to the water outlet pipe, the sludge thickening area is communicated with the sludge storage area through a sludge outlet pipeline, the sludge storage area is connected to the water inlet pipe through a sludge return pipeline, and is connected to an external dewatering facility through a sludge dewatering and discharge pipeline, synchronously realizing the land-saving and energy-saving layout of the high-efficiency sedimentation of water treatment and the concentration-storage-return or dewatering process of sludge.

[0007] Further, the mixing area is connected to the water inlet pipe at the bottom, and is internally provided with a mixing agitator and an aeration pipeline, 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 internally provided with a lifting agitator, a guide barrel 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.

[0008] Further, the transition zone enters the mud-water separation zone through a diversion baffle wall; the mud-water separation zone is located between the upper water outlet zone and the lower sludge thickening zone. The upper water outlet zone is composed of inclined tubes, water outlet finger-shaped grooves and a total water outlet channel, and the total water outlet channel is connected to a water outlet pipe; a thickening sludge scraper and a sludge storage pit are arranged in the lower sludge thickening zone, and the sludge storage pit is connected to a sludge discharge pipeline.

[0009] Further, a sludge storage area is arranged outside the mixing zone and the lifting flocculation zone. The sludge storage area receives the sludge discharged from the sludge storage pit and the external thickened sludge through an external sludge access pipe, and returns the sludge to the water inlet pipe through a sludge return pipeline, or discharges it externally through a sludge dewatering machine inlet pipeline to connect to a sludge dewatering facility or a sludge dewatering and discharge pipeline; a push-flow mixer is arranged in the sludge storage area.

[0010] Further, a water inlet pipe, a sludge storage pit sludge discharge pipeline connected to a sludge discharge lift pump, a sludge storage area inlet pipeline, a sludge storage area return pipeline connected to a sludge return lift pump and a water inlet pipe sludge dosing pipeline, a sludge storage area discharge pipeline connected to a sludge discharge lift pump and a dewatering machine inlet pipe or discharge pipeline, a sludge dewatering machine and a supporting screw conveyor and a dewatered water discharge pipeline are arranged in the sludge return and dewatering machine room.

[0011] Further, a reclaimed water access point and a coagulant adding point are arranged on the water inlet pipe, and a PAM coagulant aid adding point is arranged on the sludge return pipeline and above the overflow weir.

[0012] Further, the transition zone, the mud-water separation zone, the water outlet zone, the sludge thickening zone and the sludge storage area are all arranged in parallel with multiple channels, and the remaining channels operate normally when any one channel is under maintenance.

[0013] Further, thickening grid bars are arranged at the bottom of the thickening sludge scraper, and the lifting mixer, the sludge discharge lift pump, the sludge return lift pump and the sludge discharge lift pump are all connected to variable-frequency motors.

[0014] Further, the sludge storage area receives the sludge discharged from the sludge thickening zone, the external thickened sludge and the dewatered water of the sludge dewatering machine, and realizes the recycling or up-to-standard discharge of the dewatered water through a discharge pipeline.

[0015] Further, sedimentation, sludge dewatering and discharge include the following processes:

[0016] Raw water enters the mixing zone of the main tank body after adding alum and sludge through the influent pipe. After being mixed by the mixing agitator and aerated through the aeration pipeline, it enters the draft tube in the middle of the two-side lifting flocculation zone through the water-turning weir and the connecting channel. After being lifted by the lifting agitator and further aerated through the aeration pipeline, it is fully mixed with the muddy water outside the draft tube. The effluent enters the transition zone through the openings in the tank wall and flows into the sludge separation zone along the diversion baffle wall; the sludge separation zone realizes the separation of sludge and water. The clear water flows upward through the inclined tubes, effluent finger-shaped grooves and the total effluent channel in sequence, and finally flows through the effluent pipe to the next treatment structure; the sludge is concentrated by the concentrated sludge scraper and then enters the sludge storage pit, and then is discharged into the sludge lifting pump in the sludge return and dewatering machine room through the sludge discharge pipe. After being lifted, it is discharged into the sludge storage area through the influent pipeline; the sludge in the sludge storage area is discharged into the sludge return pump through the sludge return pipeline. After adding PAM and being lifted, it is discharged into the influent pipe through the sludge injection pipeline; the sludge can also be discharged into the sludge discharge pump through the sludge discharge pipeline. In the case of sludge discharge, it is discharged outside through the discharge pipeline. Under normal circumstances, after being lifted, it enters the sludge dehydrator for dehydration. The dehydrated sludge is discharged to the outdoor transport vehicle by the screw conveyor for timely external transportation. The dewatered water is discharged up to standard through the discharge pipeline or recycled into the sludge storage area, realizing nearly zero discharge of wastewater.

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

[0018] Through the reasonable layout of the main tank body and the sludge return and dewatering machine room, the two important links of high-efficiency sedimentation and sludge dewatering are integrated into one system. The layout of the tank type is concentrated and compact, reducing the floor area and improving the space utilization rate, creating conditions for the large-scale development of the single-tank scale, breaking through the scale limitation of the traditional tank type, and being able to meet the growing demand for water supply and drainage and special water treatment.

[0019] The transition zone, sludge separation zone, effluent zone, sludge concentration zone and sludge storage zone all adopt the multi-channel parallel layout method. This design enables the other two cells to still operate normally and discharge water when a single effluent zone and sludge concentration zone are cleaned and maintained daily, greatly reducing the impact of equipment maintenance on production, ensuring the continuity and stability of the water treatment process, and improving the overall operation efficiency.

[0020] An aeration pipeline is arranged in the tank for aeration, providing a suitable living environment for microorganisms and strengthening the biodegradation effect. At the same time, combined with the multi-point dosing of coagulants and flocculants, it can more effectively remove impurities such as organic matter in the raw water, further optimize the coagulation sedimentation process, improve the sedimentation effect, achieve high-efficiency sedimentation, and make the effluent quality better.

[0021] The sludge in the tank is controllably discharged through the sludge storage area, ensuring and making it easier to control the sludge return concentration. The sludge storage area not only receives the sludge discharged from the sludge concentration zone in the tank, but also can receive external concentrated sludge, flexibly adjusting the sludge return and discharge according to the treatment requirements, providing a stable sludge source for the subsequent sludge treatment process, and ensuring the stable operation of the entire treatment system.

[0022] Combined with dehydration measures, in-situ treatment of sludge is achieved, followed by off-site disposal or entry into the advanced drying process. This reduces energy consumption and carbon emissions during sludge transportation and treatment, achieving the goal of low-carbon emission reduction. At the same time, the sludge storage area receives the water discharged from the dehydrator, achieving nearly zero wastewater discharge, improving the utilization rate of water resources, meeting environmental protection requirements, and having good environmental benefits. Description of the Drawings

[0023] Figure 1 Schematic top view of an embodiment of the present invention;

[0024] Figure 2 Schematic bottom view of an embodiment of the present invention;

[0025] Figure 3 Is the cross-sectional view along the Figure 1 A-A line in

[0026] Figure 4 Is the cross-sectional view along the Figure 1 B-B line in

[0027] Figure 5 Is the cross-sectional view along the Figure 2 C-C line in

[0028] Numbers in the figures:

[0029] 1, main pool body; 2, sludge return and dehydration machine room; 3, mixing area; 4, lifting and flocculation area; 5, transition area; 6, sludge-water separation area; 7, water outlet area; 8, sludge thickening area; 9, sludge storage area; 10, water inlet 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, guiding baffle; 20, inclined tube; 21, water outlet finger-shaped groove; 22, total water outlet channel; 23, water outlet pipe; 24, thickening sludge scraper; 25, sludge storage pit; 26, sludge discharge pipeline; 27, sludge return pipeline; 28, sludge dehydration and discharge pipeline; 29, pushing flow agitator; 30, sludge discharge lifting pump; 31, sludge return lifting pump; 32, sludge return pipeline; 33, sludge injection pipeline in the water inlet pipe; 34, sludge discharge lifting pump; 35, sludge discharge pipeline; 36, sludge inlet pipeline for the dehydrator; 37, sludge dehydrator; 38, screw conveyor; 39, discharged water pipeline; 40, alum dosing point; 41, PAM coagulant aid dosing point; 42, external sludge access pipe; 43, recycled water access point. Detailed Embodiments

[0030] The present invention will be further described below with reference to the drawings and embodiments.

[0031] The present invention provides a bio-enhanced precipitation and dewatering integrated tank, which is used in the fields of water supply and drainage and special water treatment engineering to enhance the conventional coagulation and precipitation effect through biodegradation to remove the turbidity of raw water, and simultaneously realize the functions of sludge thickening, dewatering and nearly zero discharge of wastewater.

[0032] As Figure 1 shown, the sedimentation tank mainly includes a main tank body 1 and a co-constructed sludge return and dewatering machine room 2. The main tank body 1 is composed of a mixing zone 3, a lifting and flocculation zone 4, a transition zone 5, a mud-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 an inlet pipe 10 at the bottom, and is internally provided with a mixing agitator 11 and an air pipe line 12, and is provided with an overflow weir 13 and a connecting channel 14 to access the middle part 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 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 mud-water separation zone 6 through a guiding baffle 19. The mud-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 an outlet pipe 23. The lower sludge thickening zone 8 is provided with a thickening sludge scraper 24 and a sludge storage pit 25. The sludge storage pit 25 is connected to a 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 an external sludge access pipe 42, and returns the sludge to the inlet pipe 10 through a sludge return pipeline 32, or accesses a sludge dewatering facility through a sludge dewatering machine inlet pipeline 36 or discharges it externally through a sludge dewatering and discharge pipeline 28. A pushing 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 a sludge discharge lift pump 30 and 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 a sludge return lift pump 31, a sludge storage zone 9 sludge discharge pipeline 35 and a dewatering machine inlet 36 or an emergency discharge pipeline 28 connected to a sludge discharge lift pump 34, a sludge dewatering machine 37 and a supporting screw conveyor 38 and a dewatered water discharge pipeline 39. A reclaimed water access point 43 and a coagulant dosing point 40 are arranged on the inlet pipe 10, and a PAM coagulant aid dosing 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 thickening grid bars are arranged at the bottom of the thickening sludge scraper 24.

[0033] The operation process of the bio-enhanced sedimentation and dehydration integrated pool is as follows: the recycled water connected to the raw water and recycled water access point 43 enters the mixing zone 3 of the main pool body 1 after adding alum 40 through the water inlet pipe 10 and mud through the return mud pipeline 32, and enters 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, it enters 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, it is 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 PAM 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 transportation 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.

[0034] The above is only a specific embodiment 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 a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A biological enhanced precipitation and dehydration integrated pond, characterized in that It includes a main pool body (1) and a jointly constructed sludge return and dewatering machine room (2). The main pool body (1) includes 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). Among them, the mixing zone (3) is connected to the water inlet pipe (10), the effluent zone (7) is connected to the water outlet pipe (23), the sludge thickening zone (8) is communicated with the sludge storage zone (9) through a sludge discharge pipeline (26), the sludge storage zone (9) is connected to the water inlet pipe (10) through a sludge return pipeline (27), and is connected to an external dewatering facility through a sludge dewatering and discharge pipeline (28).

2. The integrated biological enhanced precipitation and dewatering tank according to claim 1, characterized in that The mixing zone (3) is connected to the water inlet pipe (10) at the bottom, and is internally provided with a mixing agitator (11) and an aeration pipeline (12), and is provided with an overflow weir (13) and a connecting channel (14) accessing 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 aeration 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 achieve closure.

3. The integrated biological enhanced precipitation and dewatering tank according to claim 1, wherein 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 water outlet pipe (23). The lower sludge thickening zone (8) is provided with a thickening sludge scraper (24) and a sludge storage pit (25). The sludge storage pit (25) is connected to the sludge discharge pipeline (26).

4. The integrated bio-enhanced precipitation and dewatering tank according to claim 1, characterized in that, The sludge storage zone (9) is arranged outside the mixing zone (3) and the lifting and flocculation zone (4). The sludge storage zone (9) receives the sludge discharged from the sludge storage pit (25) and the external thickened sludge through an external sludge access pipe (42), and returns the sludge to the water inlet pipe (10) through a sludge return pipeline (32), or accesses the sludge dewatering facility through a sludge inlet pipeline (36) for the dehydrator, or discharges it externally through a sludge dewatering and discharge pipeline (28). A push-flow agitator (29) is arranged in the sludge storage zone (9).

5. The integrated biological enhanced precipitation and dewatering tank according to claim 1, characterized in that, The water inlet pipe (10), a sludge storage pit sludge discharge pipeline (26) and a sludge storage zone inlet pipeline (27) connected by a sludge discharge lift pump (30), a sludge storage zone sludge return pipeline (32) and a water inlet pipe sludge injection pipeline (33) connected by a sludge return lift pump (31), a sludge storage zone discharge pipeline (35) and a sludge inlet pipeline (36) for the dehydrator or a discharge pipeline (28) connected by a sludge discharge lift pump (34), a sludge dehydrator (37) and a supporting screw conveyor (38) and a dehydrated water discharge pipeline (39) are arranged in the sludge return and dewatering machine room (2).

6. The integrated biological enhanced precipitation and dewatering tank according to claim 5, characterized in that A reclaimed water access point (43) and a coagulant addition point (40) are arranged on the water inlet pipe (10). A PAM coagulant aid addition point (41) is arranged above the sludge return pipeline (32) and the overflow weir (13).

7. The integrated bio-enhanced precipitation and dewatering tank according to claim 1, wherein 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, the remaining channels can operate normally.

8. The integrated biological enhanced precipitation and dewatering tank according to claim 3, characterized in that The bottom of the thickening sludge scraper (24) is provided with thickening grid bars, and the lifting agitator (15), the sludge discharge lift pump (30), the sludge return lift pump (31) and the sludge discharge lift pump (34) are all connected to variable frequency motors.

9. The integrated bioaugmentation precipitation and dewatering tank according to claim 1, characterized in that, The sludge storage zone (9) receives the sludge discharged from the sludge thickening zone (8), the externally thickened sludge and the dewatered water of the sludge dewatering machine (37), and realizes the recycling or up-to-standard discharge of the dewatered water through the discharge pipeline (39).

10. The integrated biological enhanced precipitation and dewatering tank according to claim 1, characterized in that, Precipitation, sludge dewatering and discharge include the following processes: The raw water enters the mixing zone (3) of the main tank body after adding alum and sludge through the water inlet pipe (10). After being mixed by the mixing agitator (11) and aerated through the aeration pipeline (12), it enters the draft tube (16) in the middle of the two-side lifting flocculation zone (4) through the water turning weir (13) and the connecting channel (14). After being lifted by the lifting agitator (15) and further aerated through the aeration pipeline (17), it is fully mixed with the sludge-water outside the draft tube (16). The water outlet enters the transition zone (5) through the opening in the pool wall and enters the sludge-water separation zone (6) along the diversion baffle (19); the sludge-water separation zone (6) realizes the separation of sludge and water. The clear water flows upward through the inclined tube (20), the water outlet finger-shaped groove (21) and the water outlet main channel (22) in sequence, and finally flows through the water outlet pipe (23) to the next treatment structure; the sludge is thickened by the thickening sludge scraper (24) and then enters the sludge storage pit (25), and then is discharged into the sludge discharge lift pump (30) in the sludge return and dewatering machine room (2) through the sludge discharge pipe (26). After being lifted, it is discharged into the sludge storage zone (9) through the sludge inlet pipeline (27); the sludge in the sludge storage zone (9) is discharged into the sludge return lift pump (31) through the sludge return pipeline (32). After adding PAM 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 the case of sludge discharge, it is discharged externally through the discharge pipeline (28). Under normal circumstances, after being lifted, it enters the sludge dewatering machine (37) for dewatering. The dewatered sludge is discharged to the outdoor transport vehicle by the screw conveyor (38) in time for external transportation. The dewatered water is discharged up to standard or flows back into the sludge storage zone (9) through the discharge pipeline (39), realizing nearly zero discharge of wastewater.

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