CN219469819U - Biochemical reaction tank - Google Patents

Abstract

The utility model discloses a biochemical reaction tank which comprises a reaction tank body, an aeration device and a sedimentation concentrator, wherein the reaction tank body is provided with the aeration device and the sedimentation concentrator. The reaction tank body can stably maintain the concentration (MLSS) of the activated sludge at 6 g/L-10 g/L in the aeration reaction stage, the sedimentation speed in the sedimentation stage is high, the sedimentation time is short, the treatment capacity is improved by more than 50%, and the treatment effect is obviously improved. Compared with the traditional SBR reaction tank, the energy consumption can be reduced by more than 30 percent.

Description

Biochemical reaction tank

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a biochemical reaction tank.

Background

The municipal sewage treatment plant mainly adopts an activated sludge process to purify sewage, and aims to remove organic matters in the sewage and perform denitrification and dephosphorization.

The sequencing batch activated sludge process, SBR process for short, is one kind of common treatment process for municipal sewage treating plant and features that in the same reaction tank, the activated sludge process consists of five steps of water feeding, aeration reaction, precipitation, water draining and sludge draining and waiting for treatment. The core of SBR technology is SBR reaction tank, and said tank integrates the functions of homogenization, primary sedimentation, biological degradation and secondary sedimentation into one tank, and has no sludge reflux system, and is specially applicable to the occasion with large intermittent discharge and flow variation.

The SBR method has a plurality of deformation processes, mainly comprising: a cyclic activated sludge process (CASS or CAST), a continuous and intermittent aeration process (DAT-ITA), an alternating internal cyclic activated sludge process (AICS), an intermittent cyclic time delay aeration activated sludge process (ICEAS), a Modified Sequencing Batch Reactor (MSBR), a UNITANK process, and the like.

According to the basic principle of the activated sludge process, the size of the activated sludge concentration (MLSS) determines the length of the biochemical reaction time and the size of the biochemical reaction tank volume. The same applies to the SBR process, when the concentration of activated sludge (MLSS) is high, the required aeration reaction time is short, the volume of the SBR reaction tank is small, whereas when the concentration of activated sludge (MLSS) is low, the aeration reaction time is long, and the volume of the SBR reaction tank is large. In addition, the size of the activated sludge concentration (MLSS) in the tank also determines the sedimentation rate and sedimentation time. The concentration of activated sludge (MLSS) is high, the sedimentation speed is low, the height of the upper clean water area is low in a specified time, and the discharged clean water is less; on the contrary, the activated sludge concentration (MLSS) is low, the sedimentation speed is high, the height of the upper clean water area is high in a specified time, and more clean water can be discharged. The mutual restriction of the activated sludge concentration (MLSS) and the sedimentation velocity is an important factor influencing the processing capacity and the processing effect of the SBR reaction tank.

The activated sludge process is classified into a conventional activated sludge process and a high concentration activated sludge process. In a system for sewage treatment by using a conventional activated sludge process, the activated sludge concentration (MLSS) of a biochemical reaction tank is generally 2 g/L to 5 g/L. In a system for sewage treatment by using a high-concentration activated sludge process, the activated sludge concentration (MLSS) of a biochemical reaction tank is generally 6 g/L to 10 g/L. Compared with the conventional activated sludge process, the high-concentration activated sludge process has very remarkable advantages, and mainly comprises the following aspects: (1) high treatment efficiency and good treatment effect; (2) the capability of bearing impact load is large, and the treatment effect is stable; (3) the discharge amount of the excess sludge can be reduced; (4) For newly built municipal sewage treatment plants, the scale of biochemical engineering can be reduced, the investment is saved, and the occupied area is reduced; (5) The prior municipal sewage treatment plant adopting the conventional activated sludge treatment process is transformed into the high-concentration activated sludge treatment process, so that the productivity and the treatment effect of the prior municipal sewage treatment plant can be greatly improved, and the energy consumption can be greatly reduced.

At present, the activated sludge concentration (MLSS) of the SBR reaction tank is generally 2 g/L to 5 g/L, and the discharge ratio (1/m) is generally 1/2 to 1/6. The discharge ratio (1/m) was 1/2, meaning that the discharge water amount per treatment cycle was 50% of the total water amount in the SBR reaction tank. When the MLSS is 2 g/L, the discharge ratio (1/m) is biased to 1/2; when the MLSS is 5 g/l, the discharge ratio (1/m) is biased to 1/6.

If the activated sludge concentration (MLSS) of the SBR reaction tank is increased from 2 g/L to 5 g/L to 6 g/L to 10 g/L, and the discharge ratio (1/m) reaches 1/2 on the premise of keeping the sedimentation time unchanged, the treatment efficiency and the treatment effect of the SBR reaction tank are greatly improved.

The technology of the patent name of the high-efficiency thickener (patent number 2022218592174) is applied, a novel sedimentation tank is designed and manufactured and used for precipitating the muddy water discharged by the biochemical reaction tank, and the practical operation achieves very remarkable application effect: after the novel sedimentation tank Man Rong, the operation is carried out for 1 hour, and the sludge concentration of the discharged active sludge is stably more than 17 g/L. When the residence time of the common sedimentation tank is more than 5 hours, the sludge concentration of the discharged active sludge is only possible to be more than 17 g/L. The success of the novel sedimentation tank proves that the plate-shaped object moving at a certain angle and a certain speed can promote the rapid sedimentation and concentration of the activated sludge.

The utility model develops an SBR reaction tank with the activated sludge concentration (MLSS) of 6-10 g/L, short sedimentation time, high treatment capacity and good treatment effect, and aims to solve the problems.

Disclosure of Invention

The utility model aims to solve the defects of the prior art and provides a biochemical reaction tank.

To achieve the purpose, the utility model adopts the following technical scheme:

the biochemical reaction tank comprises a reaction tank body, an aeration device and a sedimentation concentrator, wherein the reaction tank body is provided with the aeration device and the sedimentation concentrator.

Preferably, the aeration device is a microporous aerator, or a rotational flow aerator, or a submerged jet aerator, the microporous aerator is connected with a blower through a gas pipeline, and the rotational flow aerator is connected with the blower through a gas pipeline.

Preferably, the sedimentation concentrator is a spinning sedimentation concentrator, the spinning sedimentation concentrator comprises a motor power device, a rotating shaft and a mud pressing plate, the motor power device is in transmission connection with the rotating shaft, the mud pressing plate is fixedly connected with the rotating shaft, an included angle between the mud pressing plate and a horizontal plane is 3-75 degrees, the reaction tank body comprises an aerobic tank, the sum of the projection areas of all mud pressing plates arranged in the aerobic tank on the horizontal plane is greater than 1.1% of the projection area of a water body on the horizontal plane when the water body is aerobic Chi Manrong, the mud pressing plate can rotate around an axial lead with an included angle of 70-90 degrees with the horizontal plane, and the peripheral linear speed of the mud pressing plate during rotation is less than 5.6 m/min.

Preferably, the upper part of the reaction tank body is provided with an equipment platform, and at least 1 spinning sedimentation concentrator is arranged on the equipment platform.

Preferably, holes are distributed on the mud pressing plates, the mud pressing plates are connected with grid supports, the grid supports are connected with a rotating shaft, the mud pressing plates are arranged in 4-200 layers, the number of mud pressing plates in each layer is 1-100, an included angle between each 2-100 layers of mud pressing plates and a horizontal plane is 10-65 degrees, and an included angle between each other layer of mud pressing plates and the horizontal plane is 5-35 degrees.

Preferably, the sedimentation concentrator is a chain sedimentation concentrator, the chain sedimentation concentrator comprises a chain and a mud pressing plate, the chain is connected with the mud pressing plate, when the mud pressing plate moves linearly, the included angle between the mud pressing plate and the horizontal plane is 4-75 degrees, the reaction tank body comprises an aerobic tank, the sum of the projection areas of all mud pressing plates arranged in the aerobic tank on the horizontal plane is greater than 1.2% of the projection area of the water body on the horizontal plane when the mud pressing plate moves linearly, and the speed of the mud pressing plate when the mud pressing plate moves linearly is less than 5.6 m/min.

Preferably, the chain type sedimentation concentrator further comprises a motor power device fixedly arranged at the top of the reaction tank body, a driving chain wheel set which is arranged on the inner walls of the two sides of the reaction tank body and used in a matched mode, a driven chain wheel which is arranged on the inner walls of the two sides of the reaction tank body and used in a matched mode, and a guide rail which is arranged on the inner walls of the two sides of the reaction tank body and used in a matched mode with a chain, wherein transmission connection is realized between the driving chain wheel set and the driven chain wheel on the inner walls of the same side of the reaction tank body through an annular chain, a mud pressing plate is arranged between the two chains in a straddling mode, a plurality of mud pressing plates are arranged and are arranged along the length direction of the chains at intervals, and the driving chain wheel set is driven to rotate by the motor power device.

Preferably, holes are distributed on the mud pressing plate, the mud pressing plate is connected with a grid support, and the grid support is connected with a chain.

Preferably, a decanter is arranged in the reaction tank body.

Preferably, a flow pushing device is arranged in the reaction tank body.

Preferably, the reaction tank body is provided with a mud water inlet end, a mud water discharge end and a clear water outlet end.

In combination with the technical scheme, the utility model has the beneficial effects that:

(1) The SBR reaction tank with the technology can stably maintain the concentration of activated sludge (MLSS) to be 6-10 g/L in the aeration reaction stage, has high precipitation speed and short precipitation time in the precipitation stage, improves the treatment capacity by more than 50%, and also obviously improves the treatment effect.

(2) The technology of the utility model is adopted to save investment and project land for newly constructing municipal sewage treatment plants, and can greatly reduce investment and project land. The technology of the utility model can greatly improve the productivity and the treatment effect by adopting the existing municipal sewage treatment plant, thereby saving a large amount of investment and construction land.

(3) The technology of the utility model is used for upgrading and optimizing the existing SBR reaction tank, and can reduce the energy consumption by more than 30 percent.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model, as well as the preferred embodiments thereof, together with the following detailed description of the utility model, given by way of illustration only, together with the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of the structure of the present utility model.

Fig. 2 is a schematic top view of the present utility model.

Fig. 3 is a schematic diagram of a second embodiment of the present utility model.

Fig. 4 is a schematic top view of the second embodiment of the present utility model.

In the figure: the reaction tank comprises a reaction tank body 10, a muddy water inlet end 101, a mud discharge end 102, a clear water outlet end 103, a microporous aerator 20, a gas pipeline 201, a blower 202, a spinning sedimentation concentrator 30, a rotating shaft 301, an equipment platform 302, a shaft holding device 303, a motor power device 40, a mud pressing plate 41, holes 42, grid brackets 43, a chain sedimentation concentrator 50, a chain 501, a driving chain wheel group 502, a driven chain wheel 503, a guide rail 504, a decanter 60 and a pusher 61.

Detailed Description

As shown in fig. 1, 2, 3 and 4, the biochemical reaction tank comprises a reaction tank body 10, an aeration device and a sedimentation concentrator, wherein the reaction tank body 10 is provided with the aeration device and the sedimentation concentrator. The reaction tank body 10 comprises an aerobic tank, or comprises an aerobic tank and a biological selector, or comprises an aerobic tank and an anaerobic tank, or comprises an aerobic tank, an anaerobic tank and an anoxic tank. The aeration device is used for filling oxygen into the sewage in the reaction tank body 10 and providing oxygen for the growth and propagation of microorganisms and the purification of the sewage. The aeration device mainly comprises a microporous aerator 20, a rotational flow aerator, a surface aerator and a submerged jet aerator, wherein the microporous aerator 20 is connected with a blower 202 through a gas pipeline 201, and the rotational flow aerator is connected with the blower through the gas pipeline. In the type of the aeration apparatus, the oxygen utilization rate of the micro-pore aerator 20 is high. The sedimentation concentrator mainly comprises a spinning sedimentation concentrator 30 and a chain sedimentation concentrator 50. The sedimentation thickener is provided with the mud pressing plate 41, when the movement speed of the mud pressing plate 41 is smaller than a certain value, activated sludge in the reaction tank body 10 can be promoted to form larger flocs in a shorter time, the flocs can be promoted to sink at a faster speed, the shrinkage of the flocs volume and the water separation can be promoted, and therefore, an obvious clear water layer appears in the reaction tank body 10 in a shorter time. Through practical tests, when the activated sludge concentration (MLSS) in the reaction tank body 10 is 8 g/L, the sedimentation concentrator operates for 40 minutes, and the clear water layer height/(clear water layer height+slurry layer height) >50%; the sedimentation concentrator is not operated, and after 40 minutes, the clear water layer height/(clear water layer height+slurry layer height) <20%, and the obvious effect of the sedimentation concentrator in accelerating the sedimentation layering of the activated sludge is proved. The activated sludge concentration (MLSS) in the reaction tank body 10 is increased from 4 g/L to 8 g/L, the microorganism concentration is increased by nearly 1 time, the consumption speed of dissolved oxygen in sewage is obviously increased, the transmission speed of oxygen in air bubbles in sewage to sewage is accelerated, and the oxygen utilization rate is greatly increased, so that the air quantity required by aeration reaction is reduced, and the energy consumption is reduced by more than 30%.

Specifically, as shown in fig. 1, 2, 3 and 4, the aeration device is a micro-pore aerator 20, or a cyclone aerator, or a submerged jet aerator, the micro-pore aerator 20 is connected with a blower 202 through a gas pipeline 201, and the cyclone aerator is connected with the blower through a gas pipeline. The microporous aerator 20 is of the type including a microporous aeration tray and a microporous aeration pipe.

Specifically, as shown in fig. 1 and fig. 2, the sedimentation concentrator is a spinning sedimentation concentrator 30, the spinning sedimentation concentrator 30 comprises a motor power device 40, a rotating shaft 301 and a mud pressing plate 41, the motor power device 40 is in transmission connection with the rotating shaft 301, the rotating shaft 301 is fixedly connected with the mud pressing plate 41, an included angle between the mud pressing plate 41 and a horizontal plane is 3-75 degrees, the reaction tank body 10 comprises an aerobic tank, the sum of the projected areas of all mud pressing plates 41 arranged in the aerobic tank on the horizontal plane is greater than 1.1% of the projected area of a water body on the horizontal plane when the sum of the projected areas of all mud pressing plates 41 arranged in the aerobic tank on the aerobic tank is greater than Chi Manrong, the mud pressing plates 41 can rotate around an axis with an included angle of 70-90 degrees with the horizontal plane, and the peripheral linear speed when the mud pressing plates 41 rotate is less than 5.6 m/min. In the present utility model, the rotation shaft 301 is preferably fixedly connected to the mudguard 41, the shaft holder 303 is preferably fixedly connected to the rotation shaft 301, and the mudguard 41 is preferably fixedly connected to the shaft holder 303. When the included angle between the mud pressing plate 41 and the horizontal plane is 3-75 degrees and the outer edge linear speed of the mud pressing plate 41 is less than 5.6 m/min, the activated sludge in the reaction tank body 10 can be promoted to form larger flocs in a shorter time, the flocs can be promoted to sink at a faster speed, the shrinkage of the flocs and the water separation can be promoted, and therefore, an obvious clear water layer appears in the reaction tank body 10 in a shorter time.

Specifically, as shown in fig. 1 and 2, an equipment platform 302 is disposed at the upper portion of the reaction tank body 10, and at least 1 spinning sedimentation concentrator 30 is mounted on the equipment platform 302. In the present utility model, the equipment platform 302 is a stationary equipment platform, a rotating mobile equipment platform, or a reciprocating mobile equipment platform. The reciprocating device platform can be matched with the track for use. At least 1 spin-on type sedimentation concentrator 30 is mounted on the equipment platform 302. The number of spin-on type settlement concentrators 30 mounted to the equipment platform 302 depends on the length of the equipment platform 302 and the radius of rotation of the mud press 41. For example, when the length of the equipment platform 302 is 10 meters and the rotation radius of the mud pressing plate 41 is 1 meter, 3 to 4 spinning sedimentation concentrators 30 can be arranged on the equipment platform 302.

Specifically, as shown in fig. 1 and 2, holes 42 are distributed on the mud pressing plate 41, the mud pressing plate 41 is connected with a grid support 43, the grid support 43 is connected with the rotating shaft 301, the mud pressing plate 41 is set to 4-200 layers, the number of mud pressing plates 41 is 1-100, an included angle between 2-100 mud pressing plates 41 and a horizontal plane is 10-65 degrees from the bottom of the reaction tank body 10 upwards, and an included angle between the rest of mud pressing plates 41 and the horizontal plane is 5-35 degrees. The utility model is provided with a mud pressing plate 41, holes 42 are distributed on the mud pressing plate 41, and the holes 42 are round holes, oval holes, rectangular holes, square holes or polygonal holes. When the rotating mud pressing plate 41 presses the activated sludge floc below the mud pressing plate 41, more water and less floc pass through the holes 42 of the mud pressing plate 41, so that the mud concentration below the mud pressing plate 41 is higher than that above the mud pressing plate 41, and the mud pressing plate 41 provided with the holes 42 has better effect of promoting the separation of the floc from the water than the mud pressing plate 41 without the holes 42. The mud press 41 may be made of a metal orifice plate, or made of a plastic orifice plate, or made of a wood orifice plate, or made of a metal screen, or made of a plastic screen. In addition, the mud pressing plate 41 provided with the holes 42 can be used as a biological carrier to enrich certain microorganisms, so that the sewage purification efficiency is improved. According to the utility model, the grid support 43 is adopted, the mud pressing plate 41 is connected with the grid support 43, so that the structural rigidity of the mud pressing plate 41 is enhanced, and meanwhile, the mud pressing plate 41 is convenient to assemble; in addition, the rotating grid support 43 forms small vortex at the rear of the grid arranged in the vertical direction, which is helpful for the aggregation among activated sludge particles and causes cavities to destroy the mesh structure and the adhesion state of the sludge, so that the moisture and bubbles in the sludge are easy to separate, and the sedimentation of solids is promoted. According to the utility model, the number of layers of the mud pressing plate 41 cannot exceed the theoretical maximum value under the premise of not influencing the sedimentation, compression and densification of the activated sludge at a certain height. When the number of press plates 41 per laminate is set, the number of press plates 41 required is small if a large-area press plate 41 is used, and the number of press plates 41 required is large if a small-area press plate 41 is used. Within a certain amount, the sludge concentration of the activated sludge increases as the number of layers of the mud jacking plate 41 increases. Because the time of the sedimentation stage of the reaction tank body 10 is generally 1-1.5 hours, the time of the activated sludge sedimentation compression and thickening is relatively short, and in order to generate an obvious clear water layer in the reaction tank body 10 in a relatively short time, the number of layers of the mud pressing plates 41 is increased under the premise of theoretical permission and controllable cost. In the utility model, the included angle between the mud pressing plate 41 at the lower part of the rotating shaft 301 and the horizontal plane is larger than the included angle between the mud pressing plate 41 at the upper part of the rotating shaft 301 and the horizontal plane, which is beneficial to improving the concentration of the precipitated active mud, so that the included angle between 2-100 laminated mud pressing plates 41 and the horizontal plane is 10-65 degrees from the bottom of the reaction tank body 10 upwards, and the included angle between the rest laminated mud pressing plates 41 and the horizontal plane is 5-35 degrees.

Specifically, as shown in fig. 3 and fig. 4, the sedimentation concentrator is a chain sedimentation concentrator 50, the chain sedimentation concentrator 50 comprises a chain 501 and a mud pressing plate 41, the chain 501 is connected with the mud pressing plate 41, when the mud pressing plate 41 moves linearly, the included angle between the mud pressing plate 41 and the horizontal plane is 4-75 degrees, the reaction tank body 10 comprises an aerobic tank, the sum of the projection areas of all mud pressing plates 41 arranged in the aerobic tank on the horizontal plane is greater than 1.2% of the projection area of the water body on the horizontal plane when the mud pressing plate 41 moves linearly, and the speed of the mud pressing plate 41 is less than 5.6 m/min. In the present utility model, the chain 501 is connected to the mud press plate 41. When the mud pressing plate 41 moves linearly, the included angle between the mud pressing plate 41 and the horizontal plane is 4-75 degrees. When the speed of the linear movement of the mud pressing plate 41 is less than 5.6 m/min, the activated sludge in the reaction tank body 10 can be promoted to form larger flocs in a shorter time, the flocs can be promoted to sink at a faster speed, the shrinkage of the flocs and the water separation can be promoted, and therefore, a clear water layer is obviously formed in the reaction tank body 10 in a shorter time. In the present utility model, the chain 501 is connected to the mud flap 41 via a connecting member.

Specifically, as shown in fig. 3 and 4, the chain type sedimentation concentrator 50 further includes a motor power device 40 fixedly disposed at the top of the reaction tank body 10, a driving sprocket set 502 disposed on inner walls of two sides of the reaction tank body 10 and used in a matched manner, a driven sprocket 503 disposed on inner walls of two sides of the reaction tank body 10 and used in a matched manner, and a guide rail 504 disposed on inner walls of two sides of the reaction tank body 10 and used in a matched manner with the chain 501, wherein the driving sprocket set 502 and the driven sprocket 503 disposed on inner walls of the same side of the reaction tank body 10 are in transmission connection through an annular chain 501, a mud pressing plate 41 is mounted between the two chains 501 in a crossing manner, the mud pressing plate 41 is provided with a plurality of driving sprocket sets 502 and is disposed along a length direction of the chain 501 at intervals, and the driving sprocket set 502 is driven to rotate by the motor power device 40. The number of driving sprocket sets 502 of the present utility model is 2, and the number of driven sprockets 503 is preferably 6, but may be 2 or 8 or more. The driving sprocket set 502, the driven sprocket 503 and the guide rail 504 all comprise connecting seats, and the connecting seats are fixed on the inner wall of the reaction tank body 10. Each mud pressing plate 41 has a certain action height range in the vertical direction, and in order for the mud pressing plates 41 to simultaneously act on the slurry layer as high as possible, activated sludge is quickly sunk and compressed in a short time, and the mud pressing plates 41 need to have a large height when moving linearly. In order to make the mud pressing plate 41 have a larger height, the mud pressing plate 41 can be a plate with a large width and arranged at a large angle, or can be layered and connected to a supporting member (such as a grid bracket 43); meanwhile, the chain wheel can adopt the following modes: (1) A large-radius chain wheel is adopted, and a transmission shaft is connected between the driving chain wheel groups 502 and the driven chain wheels 503; (2) There is no drive shaft connected between the driving sprocket sets 502 and between the driven sprockets 503. The driving sprocket wheel groups 502 and the driven sprocket wheels 503 are not connected with transmission shafts, so that the mud pressing plate 41 or the mud pressing plate 41 components with larger height can be conveniently arranged. When there is no transmission shaft between the driving sprocket sets 502, the chain type sedimentation thickener 50 has three driving modes: (1) A transmission shaft crossing the reaction tank body 10 and a matched transmission mechanism are arranged for driving a group of driving chain wheel groups 502 matched with each other to rotate; (2) A chain 501 crossing the reaction tank body 10 and a matched transmission mechanism are arranged for driving a group of driving chain wheel groups 502 matched for use to rotate; (3) The motor power devices 40 are fixedly arranged at the tops of the two side walls of the reaction tank body 10 respectively, and each motor power device 40 drives the corresponding driving chain wheel group 502 to rotate. The mud press 41 or the grid support 43 can slide on the guide rail 504. The motor power device 40 drives the driving chain wheel group 502 to rotate, so that the chain 501 and the mud pressing plate 41 are driven to move, the mud pressing plate 41 which moves linearly can promote activated sludge in the reaction tank body 10 to form larger flocs in a shorter time, the flocs can be driven to sink at a faster speed, the shrinkage of the flocs and the water separation can be promoted, and therefore, an obvious clear water layer appears in the reaction tank body 10 in a shorter time.

Specifically, as shown in fig. 3 and 4, holes 42 are distributed on the mud pressing plate 41, the mud pressing plate 41 is connected with a grid bracket 43, and the grid bracket 43 is connected with a chain 501. The utility model is provided with a mud pressing plate 41, holes 42 are distributed on the mud pressing plate 41, and the holes 42 are round holes, oval holes, rectangular holes, square holes or polygonal holes. When the linearly moving mud pressing plate 41 presses the activated sludge flocs below the mud pressing plate 41, more water and less flocs pass through the holes 42 of the mud pressing plate 41, so that the mud concentration below the mud pressing plate 41 is higher than that above the mud pressing plate 41, and the mud pressing plate 41 provided with the holes 42 has better effect of promoting the separation of the flocs from the water than the mud pressing plate 41 without the holes 42. The mud press 41 may be made of a metal orifice plate, or made of a plastic orifice plate, or made of a wood orifice plate, or made of a metal screen, or made of a plastic screen. In addition, the mud pressing plate 41 provided with the holes 42 can be used as a biological carrier to enrich certain microorganisms, so that the sewage purification efficiency is improved. According to the utility model, the grid support 43 is adopted, so that the action height of the mud pressing plate 41 can be expanded, and meanwhile, the assembly of the mud pressing plate 41 and the layered arrangement of the mud pressing plate 41 are also facilitated; in addition, the grid support 43 moving linearly forms a small vortex at the rear of the grid arranged in the vertical direction, which is helpful for the aggregation among activated sludge particles, and causes cavities to destroy the mesh structure and the adhesion state of the sludge, so that the moisture and bubbles in the sludge are easy to separate, and the sedimentation of solids is promoted. In the present utility model, the grid bracket 43 is connected to the chain 501 by a connecting member.

Specifically, as shown in fig. 1, 2, 3 and 4, a decanter 60 is disposed in the reaction tank body 10. The decanter 60 is mainly a rotary decanter, a siphon decanter, and an unpowered weir siphon decanter.

Specifically, as shown in fig. 1, 2, 3 and 4, a pusher 61 is provided in the reaction tank body 10. The purpose of the present utility model to provide the impeller 61 is to push the activated sludge in the action dead zone of the sedimentation concentrator toward the action zone of the sedimentation concentrator, so that the activated sludge is rapidly sedimentation-concentrated in a short time, and thus, a clear water layer is significantly formed in the reaction tank body 10 in a short time.

Specifically, as shown in fig. 1, 2, 3 and 4, the reaction tank body 10 is provided with a mud water inlet end 101, a mud water outlet end 102 and a clear water outlet end 103.

As shown in fig. 1, 2, 3 and 4, the basic working process of the utility model is as follows: (1) In the water inlet stage, sewage enters the reaction tank body 10 through the muddy water inlet end 101 until the sewage reaches a preset water level, and the water inlet is stopped, wherein limited aeration or unlimited aeration can be adopted in the stage; (2) In the aeration reaction stage, air enters the sewage in the reaction tank body 10 through an aeration device to provide oxygen for the growth and propagation of microorganisms and the purification of the sewage, at the moment, organic pollutants are fully removed by activated sludge, BOD and COD values are continuously reduced, and when the concentration of the organic pollutants is reduced to proper values, the aeration is stopped; (3) In the precipitation stage, a sedimentation concentrator is started, so that activated sludge in the reaction tank body 10 is promoted to form larger flocs in a shorter time, the flocs are promoted to sink at a higher speed, and the volume shrinkage and water separation of the flocs are promoted, so that an obvious clear water layer appears in the reaction tank body 10 in a shorter time; (4) In the stage of draining and discharging mud, clear water is discharged out of the reaction tank body 10 through the decanter 60 and the clear water outlet end 103, and part of activated sludge is discharged out of the reaction tank body 10 as surplus sludge through the mud discharge end 102; (5) In the standby stage, the activated sludge in the reaction tank body 10 stands still, and the activity is recovered.

The foregoing is illustrative of the present utility model and is not to be construed as limiting thereof, and it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, which is also intended to be within the scope of the utility model.

Claims (10)

1. A biochemical reaction tank, which is characterized in that: the device comprises a reaction tank body, an aeration device and a sedimentation concentrator, wherein the reaction tank body is provided with the aeration device and the sedimentation concentrator.

2. A biochemical reaction cell according to claim 1, wherein: the aeration device is a microporous aerator, a rotational flow aerator or a submerged jet aerator, wherein the microporous aerator is connected with a blower through a gas pipeline, and the rotational flow aerator is connected with the blower through a gas pipeline.

3. A biochemical reaction cell according to claim 1, wherein: the sedimentation concentrator is a spinning sedimentation concentrator, the spinning sedimentation concentrator comprises a motor power device, a rotating shaft and a mud pressing plate, the motor power device is in transmission connection with the rotating shaft, the mud pressing plate is fixedly connected with the rotating shaft, an included angle between the mud pressing plate and a horizontal plane is 3-75 degrees, the reaction tank body comprises an aerobic tank, the sum of the projection areas of all mud pressing plates arranged in the aerobic tank on the horizontal plane is greater than 1.1% of the projection area of a water body on the horizontal plane when the water body is aerobic Chi Manrong, the mud pressing plate can rotate around an axial lead with the included angle of 70-90 degrees with the horizontal plane, and the outer edge linear speed of the mud pressing plate when the mud pressing plate rotates is less than 5.6 m/min.

4. A biochemical reaction cell according to claim 3, characterized in that: the upper part of the reaction tank body is provided with an equipment platform, and at least 1 spinning sedimentation concentrator is arranged on the equipment platform.

5. A biochemical reaction cell according to claim 3, characterized in that: holes are distributed on the mud pressing plates, the mud pressing plates are connected with grid supports, the grid supports are connected with a rotating shaft, the mud pressing plates are arranged in 4-200 layers, the number of mud pressing plates in each layer is 1-100, the bottom of the reaction tank body is upwards provided with an included angle between 2-100 layers of mud pressing plates and a horizontal plane of 10-65 degrees, and the included angle between the rest of mud pressing plates and the horizontal plane of 5-35 degrees.

6. A biochemical reaction cell according to claim 1, wherein: the sedimentation concentrator is a chain sedimentation concentrator, the chain sedimentation concentrator comprises a chain and a mud pressing plate, the chain is connected with the mud pressing plate, when the mud pressing plate moves linearly, the included angle between the mud pressing plate and the horizontal plane is 4-75 degrees, the reaction tank body comprises an aerobic tank, the sum of the projection areas of all mud pressing plates arranged in the aerobic tank on the horizontal plane is greater than 1.2% of the projection area of the water body on the horizontal plane when the mud pressing plate moves linearly, and the speed of the mud pressing plate when the mud pressing plate moves linearly is less than 5.6 m/min.

7. The biochemical reaction cell according to claim 6, wherein: the chain type sedimentation thickener is characterized by further comprising a motor power device fixedly arranged at the top of the reaction tank body, a driving chain wheel set which is arranged on the inner walls of the two sides of the reaction tank body and used in a matched mode, a driven chain wheel which is arranged on the inner walls of the two sides of the reaction tank body and used in a matched mode, and a guide rail which is arranged on the inner walls of the two sides of the reaction tank body and used in a matched mode with a chain, wherein the driving chain wheel set and the driven chain wheel set which are arranged on the inner walls of the same side of the reaction tank body are in transmission connection through an annular chain, a mud pressing plate is arranged between the two chains in a straddling mode, a plurality of mud pressing plates are arranged and are arranged at intervals along the length direction of the chains, and the driving chain wheel set is driven to rotate by the motor power device.

8. A biochemical reaction cell according to claim 6 or 7, characterized in that: holes are distributed on the mud pressing plate, the mud pressing plate is connected with a grid support, and the grid support is connected with a chain.

9. A biochemical reaction cell according to claim 1, wherein: a decanter is arranged in the reaction tank body.

10. A biochemical reaction cell according to claim 1, wherein: a flow pushing device is arranged in the reaction tank body.