Continuous circulation vortex water distribution device for anaerobic reactor

Abstract

The utility model discloses a continuous circulating vortex water distribution device for an anaerobic reactor. The impact resistance of the system is improved through circulating reflux, so that the system runs more stably. The device comprises a water inlet and distribution system, a negative pressure suction system, a circulating reflux system, an anaerobic reactor, a three-phase separator and a gas-water separator, the three-phase separator is arranged on the upper portion in the anaerobic reactor, the gas-water separator is installed at the top end of the anaerobic reactor, one side of the bottom of the anaerobic reactor is connected with the water inlet and distribution system, and the other side of the bottom of the anaerobic reactor is connected with the negative pressure suction system. The other side of the lower part of the anaerobic reactor is connected with a return pipe of the negative pressure suction system, the other end of the return pipe of the negative pressure suction system is connected with the gas-water separator, a water outlet return pipe and a mixed liquid return pipe in the anaerobic reactor are connected with the circulating return system, and a flowmeter is arranged between the water inlet and distribution system and the valve. According to the utility model, a continuous circulating vortex is formed through jet stirring, secondary negative pressure mud suction and gas stripping circulation, so that the hydraulic stirring effect is enhanced, mud and water are mixed more sufficiently, and the system runs more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a continuous circulation vortex water distribution device for an anaerobic reactor. Background Art

[0002] The types of anaerobic reactors commonly used in the field of sewage treatment are mainly: upflow anaerobic sludge blanket reactor (UASB), anaerobic granular sludge expanded bed reactor (EGSB), and internal circulation anaerobic reactor (IC). The main water distribution methods of anaerobic reactors are: one-pipe one-point water distribution device, one-pipe multiple-point water distribution device, pulse water distribution device, and internal circulation water distribution system. Among them, one-pipe one-point water distribution device, one-pipe multiple-point water distribution device, and pulse water distribution device generally use high-level water tanks and pipelines to distribute water, and internal circulation water distribution uses biogas to lift the mixed liquid of the anaerobic reactor to the top high position and then distribute water downward through the water distribution device.

[0003] The above water distribution methods have their own advantages and disadvantages. The water head difference of the high-level water tank plus pipe method is limited, the number of water distribution pipes is large, and the pipes are easy to be blocked. The gas lift effect of internal circulation water distribution is greatly affected by the process design and equipment processing capacity, and the scope of use has certain limitations. Therefore, a variety of new forms of water distribution devices have been developed for anaerobic reactor water distribution.

[0004] Chinese patent ZL200420109191.7 discloses a jet water distributor, which is composed of an expansion pipe, a throat pipe, a negative pressure pipe, and a jet pipe. The jet water distributor uses the Venturi principle. When raw water enters, the negative pressure sucks the sludge at the bottom of the anaerobic reactor to mix it. The water distributor is arranged along the circular tangent direction at the bottom of the anaerobic reactor, and the circulation stirring is good, but the flow of the mixed mud-water mixture is mainly concentrated at the bottom of the anaerobic reactor, lacking the power to lift it upward.

[0005] Chinese patent ZL202321045298.9 discloses an anaerobic reactor water distribution device, including a water delivery component, wherein the output end of the water delivery component is provided with a water distribution pipe after passing through the tank body of the anaerobic reactor, and at least one nozzle is connected to the water distribution pipe, and the nozzle includes a fixed tube body and a movable tube body, one end of the fixed tube body is connected to the water distribution pipe, and the other end of the fixed tube body is rotatably connected to one end of the movable tube body through a rotating pair; a water outlet is provided on the end of the movable tube body away from the fixed tube body, and the water outlet, the inner cavity of the movable tube body, the inner cavity of the fixed tube body and the inner cavity of the water distribution pipe are in a connected state. The water distribution pipes are arranged in a star shape at the bottom of the anaerobic reactor. After water enters the anaerobic reactor, an overall vortex can be formed at the bottom. The user can change the angle between the corresponding movable pipe body and the fixed pipe body according to the actual production situation, thereby adjusting the injection angle of the corresponding nozzle to change the vortex direction of the wastewater in the anaerobic reactor, thereby improving the treatment effect of the anaerobic reactor. The water distribution device described in this application belongs to multi-point water distribution. Although the water distribution is uniform, the structure is complex, the water outlet diameter is small, and there is still the possibility of blockage. In actual operation, it is also difficult to flexibly adjust the injection angle of the nozzle for multi-point water distribution. Summary of the invention

[0006] The utility model aims to provide a water distribution device for an anaerobic reactor, which is used to solve the problems in the prior art that there is much sedimentary mud at the bottom of the anaerobic reactor, the sedimentary mud has a high specific gravity, and the dead angle caused by the water distribution device itself is large, resulting in poor anaerobic effect.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] A continuous circulation vortex water distribution device for an anaerobic reactor comprises a water inlet distribution system 1, a negative pressure suction system 2, a circulation reflux system 3, an anaerobic reactor 4, a three-phase separator 5, and a gas-water separator 6, wherein the three-phase separator 5 is provided at the upper part of the anaerobic reactor 4, the gas-water separator 6 is installed at the top of the anaerobic reactor 4, one side of the bottom of the anaerobic reactor 4 is connected to the water inlet distribution system 1, the other side of the lower part of the anaerobic reactor 4 is connected to the reflux pipe of the negative pressure suction system 2, the other end of the reflux pipe of the negative pressure suction system 2 is connected to the gas-water separator 6, the internal water outlet reflux pipe and the mixed liquid reflux pipe of the anaerobic reactor 4 are connected to the circulation reflux system 3, and a flow meter 8 is installed between the water inlet distribution system 1 and the valve 7.

[0009] The negative pressure suction system provides an air source for the water inlet and distribution system. An air-water mixture is formed at the outlet of the ejector of the water inlet and distribution system and is ejected at high speed. The mixture is rectified by the guide tube to form a continuous vortex at the bottom of the anaerobic reactor, and the mud-water mixture is promoted to rise through the air lift effect. The reflux position is determined by the circulation reflux system through the opening of the valve, and a continuous cycle is formed between the reflux position and the water inlet and distribution system.

[0010] The water inlet and distribution system 1 includes a water inlet pump 101, a water distribution main pipe 102, an ejector 103, and a guide tube 104, wherein one end of the water distribution main pipe 102 extends into the interior of the anaerobic reactor 4, the ejector 103 is installed on the water distribution main pipe 102, and the guide tube 104 is installed outside the ejector 103. The water distribution main pipe 102 is connected to the return pipe in the circulation return system 3, and the water inlet pump 101 is installed on the water distribution main pipe 102, and the water inlet pump 101 is arranged between the anaerobic reactor 4 and the circulation return system.

[0011] The negative pressure suction system 2 includes a negative pressure suction pipe 201, a three-phase separator biogas return pipe 202, and a gas-water separator biogas outlet pipe 203, wherein the negative pressure suction pipe 201 is connected to the ejector 103, the negative pressure suction pipe 201 is in communication with the gas-water separator 6 and the gas-water separator biogas outlet pipe 203, and the three-phase separator 5 is connected to the gas-water separator 6. The gas source of the negative pressure suction system comes from the gas-water separator biogas return pipe, and passes through the negative pressure suction pipe to the ejector. The remaining biogas is discharged from the gas-water separator biogas outlet pipe. The negative pressure suction system adjusts the negative pressure suction biogas flow rate through a valve. The negative pressure suction system can be provided with a flow meter to measure the biogas flow rate, or the biogas flow rate can be adjusted only by the valve opening.

[0012] The circulating reflux system 3 includes a sewage raw water inlet pipe 301, an anaerobic reactor effluent return pipe 302, and an anaerobic reactor middle mixed liquid return pipe 303, wherein the sewage raw water inlet pipe 301 is connected to the water distribution main pipe 102, and the anaerobic reactor effluent return pipe 302 and the anaerobic reactor middle mixed liquid return pipe 303 are connected to the water distribution main pipe 102 after merging. A valve is installed on the pipeline, and the circulating reflux system controls the water source of the water inlet pump through the valve. The sewage raw water inlet pipe, the anaerobic reactor effluent return pipe, and the anaerobic reactor middle mixed liquid return pipe can be used as a single strand or multiple strands as the water source at the same time. The circulating reflux system controls the water inlet flow rate through the valve. The circulating reflux system can be set with a flow meter to measure the water inlet flow rate per share, or only control the water inlet flow rate per share through the valve.

[0013] The ejector is a common Venturi jet aerator, which will not be described in detail.

[0014] The number of ejectors is 1 to 4, and the service area of ​​a single ejector is 5 to 25 m 2 .

[0015] The guide tube is installed outside the ejector, and the outlet area of ​​the guide tube is 5 to 16 times the outlet area of ​​the ejector, ensuring that the flow velocity in the guide tube is above 1 m / s. The length of the guide tube is the length L of the ejector plus the water inlet end L1 and the water outlet end L2 of the ejector, L1 is 0.5 to 1.5 m, and L2 is 1.1 to 1.2 times L1. The body of the guide tube is cylindrical or semi-cylindrical. When the space at the bottom of the ejector is larger than the radius of the guide tube, the body of the guide tube is cylindrical. When the space at the bottom of the ejector is smaller than the radius of the guide tube, the body of the guide tube is semi-cylindrical, which can fit the bottom of the anaerobic reactor.

[0016] Beneficial technical effects of the utility model:

[0017] The utility model uses sewage raw water, mixed liquid in the middle section of the anaerobic reactor and effluent from the anaerobic reactor as inlet water sources, pressurizes the water to the ejector inside the anaerobic reactor through a water pump, and is ejected by the ejector to form a high-speed water flow. The high-speed water flow flows through the guide tube, and a secondary negative pressure is formed at the rear end of the ejector outlet, sucking sludge in the opposite direction area of ​​the ejector outlet, and multiple air-water-mud mixing forms agitation at the bottom of the anaerobic reactor pool, and the ejector orientation and quantity are set according to the pool type of the anaerobic reactor to form a stirring vortex effect.

[0018] The utility model discloses a negative pressure suction system which uses an ejector to negatively pressure suck the biogas of the gas-water separator of the anaerobic reactor, mixes the biogas with the inlet water source, and forms a gas-water mixed state after being ejected by the ejector. The bottom sludge is promoted to rise through the air lift effect, and the effect of the upper and lower circulating vortex is formed.

[0019] The water heads of the water pumps in the water distribution system of the utility model are all used to overcome resistance and hydraulic stirring, thus avoiding the waste of redundant water heads when distributing water in a high-position water tank and reducing energy consumption.

[0020] The water pump of the water distribution system of the utility model is used as a water inlet pump and also as an internal circulation pump, which can save one-time investment in some application scenarios.

[0021] The utility model forms a continuous circulating vortex through jet stirring, secondary negative pressure mud suction and air lift circulation, thereby strengthening the hydraulic stirring effect, making the mud and water mixing more fully, improving the impact resistance of the system through circulating reflux, and making the system operation more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model.

[0024] Figure 2 This is a schematic diagram of the aa cross-sectional structure of Example 1 of the utility model.

[0025] Figure 3 This is a schematic diagram of node A in Example 1 of the utility model.

[0026] Figure 4 This is a schematic diagram of the structure of Example 2 of the utility model.

[0027] Figure 5 This is a schematic diagram of the bb cross-sectional structure of Example 2 of the utility model.

[0028] Figure 6 This is a schematic diagram of node B of embodiment 2 of the present utility model.

[0029] In the figure: 1-water inlet and outlet system, 2-negative pressure suction system, 3-circulation reflux system, 4-anaerobic reactor, 5-three-phase separator, 6-gas-water separator, 7-valve, 8-flow meter.

[0030] 101-water inlet pump, 102-water distribution main pipe, 103-ejector, 104-flow guide tube, 201-negative pressure suction pipe, 202-gas-water separator biogas return pipe, 203-gas-water separator biogas outlet pipe, 301-sewage raw water inlet pipe, 302-anaerobic reactor outlet return pipe, 303-anaerobic reactor middle mixed liquor return pipe. DETAILED DESCRIPTION Example 1

[0031] As attached Figure 1 , Figure 2 , Figure 3 As shown, in the embodiment of the utility model, an anaerobic reactor water distribution device includes: 1-water inlet distribution system, 2-negative pressure suction system, 3-circulation reflux system, wherein 1-water inlet distribution system includes 101-water inlet pump, 102-water distribution main pipe, 103-ejector, 104-guide tube, 2-negative pressure suction system includes 201-negative pressure suction pipe, 202-gas-water separator biogas reflux pipe, 203-gas-water separator biogas outlet pipe, 3-circulation reflux system includes 301-sewage raw water inlet pipe, 302-anaerobic reactor outlet reflux pipe, 303-anaerobic reactor middle mixed liquor reflux pipe.

[0032] In the embodiment of the utility model, the sewage raw water contains a large amount of inorganic suspended solids, there is no primary sedimentation tank in front of the anaerobic reactor, the anaerobic reactor is designed to be circular with a radius of 2m, the water inlet distribution system is 0.5m away from the bottom of the anaerobic reactor, an ejector is set, the ejector adopts a venturi tube, the ejector outlet diameter is 0.05m, the ejector length L is 0.6m, the outlet area of ​​the guide tube is 16 times the ejector outlet area, the outlet diameter is 0.2m, L1 is 0.75m, L2 is 0.9m, and the guide tube body is cylindrical. The bottom of the guide tube body is 0.4m away from the bottom of the anaerobic reactor tank body.

[0033] In the embodiment of the utility model, the negative pressure suction system sucks the biogas from the gas-water separator to the negative pressure suction pipe, and the negative pressure suction pipe is provided with a flow meter and a valve.

[0034] In the embodiment of the utility model, the water inlet sources of the circulation return system 3 include a sewage raw water inlet pipe 301, an anaerobic reactor outlet water return pipe 302, and an anaerobic reactor middle mixed liquid return pipe 303.

[0035] In the embodiment of the utility model, during the operation of the anaerobic reactor, the water inlet and distribution system is not blocked, the continuous vortex stirring effect above the water inlet and distribution system is good, the air lift effect is obvious, the guide tube negative pressure suction sludge stirring depth is 0.2m, and the bottom 0.2m of the pool bottom is inorganic sludge. According to the actual anaerobic biochemical situation and the flow meter reading, the negative pressure suction system and the circulation reflux system valve opening are adjusted to adjust the continuous circulation vortex effect to ensure the water output index. Example 2

[0036] As attached Figure 4 , Figure 5 , Figure 6 As shown, in the embodiment of the utility model, an anaerobic reactor water distribution device includes: 1-water inlet distribution system, 2-negative pressure suction system, 3-circulation reflux system, wherein 1-water inlet distribution system includes 101-water inlet pump, 102-water distribution main pipe, 103-ejector, 104-guide tube, 2-negative pressure suction system includes 201-negative pressure suction pipe, 202-gas-water separator biogas reflux pipe, 203-gas-water separator biogas outlet pipe, 3-circulation reflux system includes 301-sewage raw water inlet pipe, 302-anaerobic reactor outlet reflux pipe, 303-anaerobic reactor middle mixed liquor reflux pipe.

[0037] In the embodiment of the utility model, the sewage raw water is high-concentration organic sewage, and the anaerobic reactor is designed to be square with a long side of 8m and a wide side of 6m. The water inlet and outlet system is 0.15m away from the bottom of the anaerobic reactor. The ejector adopts a venturi tube, the ejector outlet diameter is 0.065m, the ejector length L is 0.8m, the outlet area of ​​the guide tube is 12 times the ejector outlet area, the outlet diameter is 0.23m, L1 is 0.5m, L2 is 0.6m, the guide tube body is semi-cylindrical, and the bottom of the guide tube is in contact with the bottom of the anaerobic reactor.

[0038] In the embodiment of the utility model, the negative pressure suction system sucks the biogas from the gas-water separator to the negative pressure suction pipe, and the negative pressure suction pipe is provided with a flow meter and a valve.

[0039] In the embodiment of the utility model, the water inlet sources of the circulation return system 3 include a sewage raw water inlet pipe 301, an anaerobic reactor outlet water return pipe 302, and an anaerobic reactor middle mixed liquid return pipe 303.

[0040] In the embodiment of the utility model, during the operation of the anaerobic reactor, the water inlet and distribution system is not blocked, the continuous vortex stirring effect above the water inlet and distribution system is good, the air lift effect is obvious, the suction sludge stirring depth of the guide tube is 0.25m, and there is basically no large-scale sludge deposition at the bottom of the pool. According to the actual anaerobic biochemical situation and the flow meter reading, the opening of the negative pressure suction system and the circulation reflux system valve is adjusted to adjust the continuous circulation vortex effect to ensure the water output index.

Claims

1. A continuous circulation vortex water distribution device for an anaerobic reactor, characterized in that: The invention comprises a water supply and distribution system (1), a negative pressure suction system (2), a circulation reflux system (3), an anaerobic reactor (4), a three-phase separator (5), and a gas-water separator (6), wherein the upper part of the anaerobic reactor (4) is provided with a three-phase separator (5), the top of the anaerobic reactor (4) is provided with a gas-water separator (6), one side of the bottom of the anaerobic reactor (4) is connected to the water supply and distribution system (1), the other side of the lower part of the anaerobic reactor (4) is connected to the reflux pipe of the negative pressure suction system (2), the other end of the reflux pipe of the negative pressure suction system (2) is connected to the gas-water separator (6), the internal water outlet reflux pipe and the mixed liquid reflux pipe of the anaerobic reactor (4) are connected to the circulation reflux system (3), and a flow meter (8) is installed between the water supply and distribution system (1) and the valve (7).

2. The continuous circulation vortex water distribution device for an anaerobic reactor according to claim 1, characterized in that: The water inlet and distribution system (1) comprises a water inlet pump (101), a water distribution main pipe (102), an ejector (103), and a guide tube (104), wherein one end of the water distribution main pipe (102) extends into the interior of the anaerobic reactor (4), the ejector (103) is installed on the water distribution main pipe (102), the guide tube (104) is installed outside the ejector (103), the water distribution main pipe (102) is connected to a return pipe in a circulation return system (3), the water inlet pump (101) is installed on the water distribution main pipe (102), and the water inlet pump (101) is arranged between the anaerobic reactor (4) and the circulation return system.

3. The continuous circulation vortex water distribution device for an anaerobic reactor according to claim 1, characterized in that: The negative pressure suction system (2) comprises a negative pressure suction pipe (201), a biogas return pipe (202) of a three-phase separator, and a biogas outlet pipe (203) of a gas-water separator, wherein the negative pressure suction pipe (201) is connected to the ejector (103), the negative pressure suction pipe (201) is in communication with the gas-water separator (6) and the biogas outlet pipe (203) of the gas-water separator, and the three-phase separator (5) is connected to the gas-water separator (6).

4. The continuous circulation vortex water distribution device for an anaerobic reactor according to claim 1, characterized in that: The circulation return system (3) comprises a sewage raw water inlet pipe (301), an anaerobic reactor effluent return pipe (302), and an anaerobic reactor middle section mixed liquid return pipe (303), wherein the sewage raw water inlet pipe (301) is connected to a water distribution main pipe (102), and the anaerobic reactor effluent return pipe (302) and the anaerobic reactor middle section mixed liquid return pipe (303) are connected to the water distribution main pipe (102) after merging.

5. The continuous circulation vortex water distribution device for an anaerobic reactor according to claim 2, characterized in that: The number of ejectors is 1 to 4, and the service area of ​​a single ejector is 5 to 25 m 2 .

6. The continuous circulation vortex water distribution device for an anaerobic reactor according to claim 2, characterized in that: The guide tube is installed outside the ejector, and the outlet area of ​​the guide tube is 5 to 16 times the outlet area of ​​the ejector. The length of the guide tube is the length of the ejector plus the water inlet end L1 and the water outlet end L2 of the ejector. L1 is 0.5 to 1.5 m, and L2 is 1.1 to 1.2 times L1. The body of the guide tube is a cylinder or a semi-cylinder. When the bottom space of the ejector is larger than the radius of the guide tube, the body of the guide tube is a cylinder. When the bottom space of the ejector is smaller than the radius of the guide tube, the body of the guide tube is a semi-cylinder, which can fit the bottom of the anaerobic reactor.

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