Sewage treatment system

Abstract

The utility model discloses a sewage treatment system and belongs to the technical field of acrylic acid sewage treatment. According to the technical scheme, the system comprises a cleaning wastewater collecting tank, a regulating tank, a blending tank, an anaerobic reactor, an aeration tank, a secondary sedimentation tank and an external drainage tank which are sequentially connected through pipelines, the cleaning wastewater collecting tank is connected with a process alkali cleaning wastewater inlet pipeline, a butyl acrylate wastewater inlet pipeline I and an acrylic acid wastewater inlet pipeline I; the adjusting tank is connected with a wastewater tank through a pipeline; the adjusting tank is connected with a butyl acrylate wastewater inlet pipeline II and an acrylic acid wastewater inlet pipeline II; the adjusting tank is also connected with a rain sewage tank through a pipeline; the blending pool is provided with a plurality of dosing pipelines; the anaerobic reactor is provided with a biogas outlet pipeline; the aeration tank is connected with an air blower air inlet pipeline which is connected with an air blower room; and a sludge return pipeline is also connected between the aeration tank and the sludge storage tank. The waste water treatment device can effectively treat waste water, realizes secondary utilization, and improves the utilization rate of the waste water.

Description

Technical Field

[0001] The utility model belongs to the technical field of acrylic sewage treatment, and particularly relates to a sewage treatment system. Background Technique

[0002] Acrylic acid wastewater mainly comes from the production process of acrylic acid and its esters, which contains a large amount of organic substances such as acrylic acid, acrylic esters, unreacted raw materials, catalysts, solvents, etc., as well as some inorganic salts. These wastewaters are characterized by high COD value, high BOD value, high chroma, high toxicity, etc., and the pH value of the wastewater is usually low. Traditional treatment methods such as incineration method, wet catalytic oxidation method, and microbial degradation method, etc., all have certain limitations.

[0003] Chinese Utility Model Patent CN222099659U discloses an acrylic acid wastewater treatment device, which includes a wastewater treatment box body. A top frame is arranged at the top of the wastewater treatment box body. A threaded rod is arranged inside the top frame. One end of the threaded rod is sleeved with a moving block. An arc-shaped plate is arranged at the bottom end of the moving block. A pH meter is arranged on one side of the top frame. A magnifying glass is arranged on one side of the top frame. A reinforcing rod is arranged at the top of the pH meter. An electrode rod is arranged inside the arc-shaped plate. By setting the threaded rod, moving block, straight plate, vertical rod, auxiliary sleeve and flapping plate, rotating the rotating rod will drive the moving block and the arc-shaped plate to move back and forth. The flapping plate can stir the acrylic acid wastewater. The electrode rod is embedded in the wastewater, and can detect the pH value of the adjusted wastewater, solving the problem of manually taking the electrode rod to detect the pH value of the wastewater, saving a lot of time and energy. Although the pH detection problem is solved, an anaerobic reactor and a multi-stage regulation pool are not set, and there are problems of insufficient treatment and inability to recycle twice during the wastewater treatment process, resulting in waste of resources. Content of the Utility Model

[0004] The utility model provides a sewage treatment system, which can effectively treat wastewater, realize secondary utilization, and improve the utilization rate of wastewater.

[0005] The technical solution of the utility model is as follows:

[0006] The sewage treatment system includes a cleaning wastewater collection tank, an adjustment tank, a preparation tank, an anaerobic reactor, an aeration tank, a secondary sedimentation tank, and an external drainage tank connected in sequence through pipelines; the cleaning wastewater collection tank is connected with a process caustic washing wastewater inlet pipeline, a butyl acrylate wastewater inlet pipeline 1, and an acrylic acid wastewater inlet pipeline 1; the adjustment tank is connected with a wastewater tank through a pipeline; the adjustment tank is connected with a butyl acrylate wastewater inlet pipeline 2 and an acrylic acid wastewater inlet pipeline 2; the adjustment tank is also connected with a rain and sewage tank through a pipeline; the preparation tank is provided with several chemical addition pipelines; the anaerobic reactor is provided with a biogas outlet pipeline; the aeration tank is connected with a blower inlet pipeline, and the blower inlet pipeline is connected with a blower room; the secondary sedimentation tank is also connected with a sludge storage tank through a pipeline, the sludge storage tank is connected with a drying system through a pipeline, and the dried sludge is transported outside the system; a sludge return pipeline is also connected between the sludge storage tank and the aeration tank; a recycled water utilization pipeline is arranged between the external drainage tank and the preparation tank; the external drainage tank is connected with a main drainage well through a pipeline, and the main drainage well is connected with a pipeline to a monitoring pump room, a bottom water pipeline of a water purification plant, and a pipeline to a municipal sewage treatment plant.

[0007] Preferably, a water pump 1 is arranged on the pipeline between the cleaning wastewater collection tank and the adjustment tank; a water pump 2 is arranged on the pipeline between the adjustment tank and the preparation tank; a water pump 3 is arranged on the pipeline between the preparation tank and the anaerobic reactor.

[0008] Preferably, the anaerobic reactor includes a reactor shell, a top three-phase separator, and a bottom three-phase separator. The reactor shell is connected with an inlet pipe, an outlet pipe, and an internal reflux pipe. A water distributor is arranged at the bottom inside the reactor shell. Above the water distributor inside the reactor shell is the bottom three-phase separator. Below the bottom three-phase separator is a primary reaction chamber. The water distributor is used for distributing water below the bottom three-phase separator; the top three-phase separator is fixedly arranged inside the reactor shell, above the bottom three-phase separator; a secondary reaction chamber is formed between the bottom three-phase separator and the top three-phase separator; a gas-liquid separator is arranged at the top inside the reactor shell. An outlet pipe is arranged at the top of the gas-liquid separator, and the top end of the outlet pipe penetrates through the reactor shell. The outlet pipe is connected with the biogas outlet pipeline. The gas-liquid separator is connected with the top three-phase separator and the bottom three-phase separator through a feed pipe. The feed pipe enables biogas and a small amount of sewage to flow into the gas-liquid separator. An internal reflux pipe is arranged at the bottom of the gas-liquid separator. One end of the internal reflux pipe penetrates through the top three-phase separator and the bottom three-phase separator and extends downward. The internal reflux pipe returns the sewage for repeated treatment.

[0009] Preferably, a drain pipe is arranged at the bottom of the anaerobic reactor. The drain pipe is provided with a control valve. The drain pipe is used for cleaning the materials inside the reactor.

[0010] Preferably, the anaerobic reactor further includes one or more reverse swirl plates disposed above the water distributor and surrounding the inner wall of the reactor housing. The anaerobic reactor breaks or weakens the swirl flow field caused by the swirl water distributor by setting the reverse swirl plates, so as to improve the uniformity of the flow field. Thus, it can ensure swirl water distribution, improve sludge fluidization, and ensure that the biogas collection of the three-phase separator is not affected.

[0011] Preferably, the included angle between the axis direction of the reverse swirl plate and the vertical direction is 30°-60°.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model effectively balances the fluctuations of water quality and quantity by linking the cleaning wastewater collection tank, the regulating tank and the rain and sewage tank, and combining the diversion control of different wastewater inlet pipelines (such as the process caustic washing wastewater and the butyl acrylate wastewater entering through different branches), so as to avoid impacting the biological treatment unit.

[0014] 2. In the anaerobic reactor of the utility model, the bottom three-phase separator and the top three-phase separator form a first-level and a second-level reaction chamber. Combining the internal reflux pipe and the reverse swirl plate, it enhances the mixing contact between the wastewater and the anaerobic sludge, and improves the COD removal rate and the biogas production rate.

[0015] 3. The preparation tank precisely adjusts the wastewater characteristics through multiple chemical addition pipelines (such as acid-base neutralizing agents and nutrient salts) to ensure the best activity of anaerobic / aerobic microorganisms.

[0016] 4. The gas-liquid separator and the biogas outlet pipeline achieve efficient biogas collection, which can be directly used for the energy supplement of the factory area.

[0017] 5. The external drainage tank reuses the qualified clean water for the preparation tank or the factory area cleaning through the recycled water utilization pipeline, reducing the consumption of fresh water.

[0018] 6. The sludge in the secondary sedimentation tank is concentrated in the sludge storage tank and then dried and transported out. The water content is reduced to less than 60%, reducing the disposal cost. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the sewage treatment system of the utility model.

[0020] Figure 2 is a schematic structural diagram of the anaerobic reactor of the utility model.

[0021] In the figure, 1 is the cleaning wastewater collection tank; 2 is the regulating tank; 3 is the rain and sewage tank; 4 is the wastewater tank; 5 is the preparation tank; 6 is the anaerobic reactor; 601 is the reactor housing; 602 is the top three-phase separator; 603 is the bottom three-phase separator; 604 is the inlet pipe; 605 is the outlet pipe; 606 is the internal reflux pipe; 607 is the water distributor; 608 is the gas-liquid separator; 609 is the outlet gas pipe; 610 is the vent pipe; 611 is the reverse swirl plate; 7 is the aeration tank; 8 is the blower house; 9 is the sludge storage tank; 10 is the secondary sedimentation tank; 11 is the external drainage tank; 12 is the total drainage well; 13 is the process caustic washing wastewater inlet pipeline; 14 is the first acrylic butyl ester wastewater inlet pipeline; 15 is the first acrylic acid wastewater inlet pipeline; 16 is the second acrylic butyl ester wastewater inlet pipeline; 17 is the second acrylic acid wastewater inlet pipeline; 18 is the chemical dosing pipeline; 19 is the biogas outlet pipeline; 20 is the blower inlet pipeline; 21 is the sludge return pipeline; 22 is the drying system; 23 is the recycled water utilization pipeline; 24 is the monitoring pump house pipeline; 25 is the bottom water pipeline of the water purification plant; 26 is the pipeline to the municipal sewage treatment plant. Detailed implementation mode

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model.

[0023] Embodiment 1

[0024] As Figure 1 and Figure 2 shown, this embodiment provides a sewage treatment system, including a cleaning wastewater collection tank 1, a regulating tank 2, a preparation tank 5, an anaerobic reactor 6, an aeration tank 7, a secondary sedimentation tank 10, and an external drainage tank 11 that are sequentially connected by pipelines;

[0025] The cleaning wastewater collection tank 1 is connected with a process caustic washing wastewater inlet pipeline 13, a first acrylic butyl ester wastewater inlet pipeline 14, and a first acrylic acid wastewater inlet pipeline 15; a water pump 1 is arranged on the pipeline between the cleaning wastewater collection tank 1 and the regulating tank 2;

[0026] The regulating tank 2 is connected with a wastewater tank 4 through a pipeline; the regulating tank 2 is connected with a second acrylic butyl ester wastewater inlet pipeline 16 and a second acrylic acid wastewater inlet pipeline 17; the regulating tank 2 is also connected with a rain and sewage tank 3 through a pipeline, and the rain and sewage tank 3 is used for collecting emergency rainwater;

[0027] The preparation tank 5 is provided with a number of chemical dosing pipelines 18, and a water pump 2 is arranged on the pipeline between the regulating tank 2 and the preparation tank 5;

[0028] The anaerobic reactor 6 is provided with a biogas outlet pipeline 19, and a water pump 3 is arranged on the pipeline between the preparation tank 5 and the anaerobic reactor 6;

[0029] The aeration tank 7 is connected to a blower air inlet pipeline 20, and the blower air inlet pipeline 20 is connected to a blower house 8; a sludge return pipeline 21 is also connected between the sludge storage tank 9 and the aeration tank 7;

[0030] The secondary sedimentation tank 10 is also connected to the sludge storage tank 9 through a pipeline, and the sludge storage tank 9 is connected to a drying system 22 through a pipeline, and the dried sludge is transported out of the system;

[0031] A recycled water utilization pipeline 23 is provided between the external drainage tank 11 and the blending tank 5; the external drainage tank 11 is connected to a main drainage well 12 through a pipeline, and the main drainage well 12 is connected to a pipeline 24 to a monitoring pump house, a bottom water pipeline 25 of a water purification plant, and a pipeline 26 to a municipal sewage treatment plant.

[0032] The anaerobic reactor 6 includes a reactor housing 601, a top three-phase separator 602, and a bottom three-phase separator 603. The reactor housing 601 is connected to a water inlet pipe 604, a water outlet pipe 605, and an internal reflux pipe 606. A water distributor 607 is provided at the bottom inside the reactor housing 601. Above the water distributor 607 inside the reactor housing 601 is provided the bottom three-phase separator 603. Below the bottom three-phase separator 603 is a primary reaction chamber. The water distributor 607 is used for distributing water below the bottom three-phase separator 603; the top three-phase separator 602 is fixedly provided inside the reactor housing 601, above the bottom three-phase separator 603; a secondary reaction chamber is formed between the bottom three-phase separator 603 and the top three-phase separator 602;

[0033] A gas-liquid separator 608 is provided at the top inside the reactor housing 601. An air outlet pipe 609 is provided at the top of the gas-liquid separator 608, and the top end of the air outlet pipe 609 penetrates through the reactor housing 601. The air outlet pipe 609 is connected to a biogas outlet pipeline 19. The gas-liquid separator 608 is connected to the top three-phase separator 602 and the bottom three-phase separator 603 through a feed pipe. An internal reflux pipe 606 is provided at the bottom of the gas-liquid separator 608, and one end of the internal reflux pipe 606 penetrates through the top three-phase separator 602 and the bottom three-phase separator 603 and extends downward.

[0034] A blowdown pipe 610 is provided at the bottom of the anaerobic reactor 6. The blowdown pipe 610 is provided with a control valve, and the blowdown pipe 610 is used for cleaning the materials inside the reactor.

[0035] The anaerobic reactor 6 also includes one or more layers of reverse cyclone plates 611 arranged around the inner wall of the reactor shell 601 above the water distributor 607, and the angle between the axial direction of the reverse cyclone plates 611 and the vertical direction is 30°; the anaerobic reactor 6 breaks or weakens the cyclone flow field caused by the cyclone water distributor 607 by arranging the reverse cyclone plates to improve the uniformity of the flow field, thereby ensuring cyclone water distribution, improving sludge fluidization, and ensuring that the biogas collection of the three-phase separator is not affected.

[0036] Working process:

[0037] Process alkali washing wastewater, butyl acrylate wastewater, and acrylic acid wastewater enter the cleaning wastewater collection tank 1 through pipelines respectively, and are initially mixed and transported to the regulating tank 2 by water pump 1. The regulating tank 2 receives high-concentration wastewater from the wastewater tank 4 and emergency water from the rainwater tank 3, balances the water quality through aeration and mixing, and then is lifted to the blending tank 5 by water pump 2. The blending tank 5 adds acid-base regulators, nitrogen and phosphorus nutrients, etc. through the dosing pipeline 18 to adjust the wastewater to the suitable range for anaerobic bacteria.

[0038] The prepared wastewater enters the water distributor 607 at the bottom of the anaerobic reactor 6 through the water pump 3 and is evenly distributed to the primary reaction chamber; the gas-liquid-solid preliminary separation is achieved through the bottom three-phase separator 603, the biogas rises to the gas-liquid separator 608, and the sludge settles and flows back; the secondary reaction chamber further degrades organic matter, the top three-phase separator 602 strengthens the separation effect, and the internal return pipe 606 returns part of the mud-water mixture to the bottom to achieve repeated treatment of sewage. The effluent of the anaerobic reactor 6 enters the aeration tank 7, the blower supplies oxygen through the blower air inlet pipe 20, and aerobic microorganisms degrade the remaining organic matter; the sludge return pipe 21 returns part of the activated sludge to the aeration tank 7, and the aeration tank enters the secondary sedimentation tank 10 after aeration treatment. The sludge after sedimentation in the secondary sedimentation tank 10 is discharged to the sludge storage tank 9. After sedimentation in the secondary sedimentation tank 10, the supernatant flows into the external drainage tank 11, part of the clean water is reused in the blending tank 5 through the recycled water utilization pipeline 23, and the rest is discharged as needed through the main drainage well 12; the sludge in the sludge storage tank 9 is concentrated and dried and transported out.

[0039] When the water quality is abnormal, the vent pipe 610 can quickly empty the anaerobic reactor 6 for maintenance; the water outlet from the main drainage well 12 is monitored in real time, and if it exceeds the standard, it is switched to the monitoring pump room for further treatment to ensure that the discharge meets the standard.

Claims

1. A sewage treatment system, characterized in that: It comprises a cleaning wastewater collection tank (1), a regulating tank (2), a blending tank (5), an anaerobic reactor (6), an aeration tank (7), a secondary sedimentation tank (10) and an external drainage tank (11) which are sequentially connected via pipelines; The cleaning wastewater collection tank (1) is connected to a process alkali washing wastewater inlet pipeline (13), a butyl acrylate wastewater inlet pipeline 1 (14) and an acrylic acid wastewater inlet pipeline 1 (15); The regulating tank (2) is connected to a wastewater tank (4) via a pipeline; the regulating tank (2) is connected to a second butyl acrylate wastewater inlet pipeline (16) and a second acrylic acid wastewater inlet pipeline (17); the regulating tank (2) is also connected to a rainwater sewage tank (3) via a pipeline; The mixing tank (5) is provided with a plurality of dosing pipelines (18); The anaerobic reactor (6) is provided with a biogas outlet pipeline (19); The aeration tank (7) is connected to a blower air inlet pipeline (20), and the blower air inlet pipeline (20) is connected to a blower room (8); The secondary sedimentation tank (10) is also connected to the sludge storage tank (9) via a pipeline, and the sludge storage tank (9) is connected to the drying system (22) via a pipeline; a sludge return pipeline (21) is also connected between the sludge storage tank (9) and the aeration tank (7); A recycled water utilization pipeline (23) is provided between the external drainage pool (11) and the blending pool (5); the external drainage pool (11) is connected to a main drainage well (12) via a pipeline, and the main drainage well (12) is connected to a pipeline to a monitoring pump room (24), a bottom water pipeline (25) of a water treatment plant, and a pipeline (26) to a municipal sewage plant.

2. The sewage treatment system according to claim 1, characterized in that: The pipeline between the cleaning wastewater collection tank (1) and the regulating tank (2) is provided with a water pump 1; the pipeline between the regulating tank (2) and the blending tank (5) is provided with a water pump 2; and the pipeline between the blending tank (5) and the anaerobic reactor (6) is provided with a water pump 3.

3. The sewage treatment system according to claim 1, characterized in that: The anaerobic reactor (6) comprises a reactor shell (601), a top three-phase separator (602) and a bottom three-phase separator (603); the reactor shell (601) is connected to a water inlet pipe (604), a water outlet pipe (605) and an internal return pipe (606); a water distributor (607) is arranged at the bottom of the reactor shell (601); the bottom three-phase separator (603) is arranged above the water distributor (607) in the reactor shell (601); a primary reaction chamber is provided below the bottom three-phase separator (603); the water distributor (607) is used to distribute water below the bottom three-phase separator (603); the top three-phase separator (602) is arranged in the reactor shell (601) and is located above the bottom three-phase separator (603); a secondary reaction chamber is formed between the bottom three-phase separator (603) and the top three-phase separator (602); A gas-liquid separator (608) is arranged at the top of the reactor shell (601); an outlet pipe (609) is arranged at the top of the gas-liquid separator (608); and the top end of the outlet pipe (609) passes through the reactor shell (601); the outlet pipe (609) is connected to the biogas outlet pipeline (19); the gas-liquid separator (608) is connected to the top three-phase separator (602) and the bottom three-phase separator (603) via a feed pipe; an inner reflux pipe (606) is arranged at the bottom of the gas-liquid separator (608); one end of the inner reflux pipe (606) passes through the top three-phase separator (602) and the bottom three-phase separator (603) and extends downward.

4. The sewage treatment system according to claim 3, characterized in that: A vent pipe (610) is provided at the bottom of the anaerobic reactor (6), and the vent pipe (610) is provided with a control valve.

5. The sewage treatment system according to claim 3, characterized in that: The anaerobic reactor (6) further comprises one or more layers of reverse cyclone plates (611) arranged above the water distributor (607) and surrounding the inner wall of the reactor shell (601).

6. The sewage treatment system according to claim 5, characterized in that: The angle between the axis direction of the reverse cyclone plate (611) and the vertical direction is 30°-60°.

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