Biochemical pool capable of separating mud from water

Abstract

The utility model discloses a biochemical pool capable of separating mud from water, which comprises a biochemical pool body, an aeration device and a mud-water separator, and the aeration device and the mud-water separator are arranged in the biochemical pool body. According to the biochemical pool adopting the technology disclosed by the utility model, mud-water separation can be carried out in the sewage plug flow and aeration process, activated sludge is retained in the biochemical pool, a sludge return system is not required to be configured, sludge return is not required, clear water is directly discharged, and the biochemical pool has long-time continuous and stable operation capability, and saves project land, project investment and sludge return power consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a biochemical pool capable of separating mud and water. Background Art

[0002] Municipal sewage treatment plants mainly use the activated sludge method to biochemically treat sewage, with the aim of removing organic matter from sewage and removing nitrogen and phosphorus. According to the basic principle of the activated sludge method, the size of the activated sludge concentration (MLSS) determines the length of the biochemical reaction time and the size of the biochemical pool.

[0003] The activated sludge method is divided into conventional activated sludge method and high-concentration activated sludge method. At present, most municipal sewage treatment plants in China use conventional activated sludge method. In the system using conventional activated sludge method for sewage treatment, the activated sludge concentration (MLSS) of the biochemical pool is generally 2 g / L~5 g / L. In the system using high-concentration activated sludge method for sewage treatment, the activated sludge concentration (MLSS) of the biochemical pool is generally 6 g / L~10 g / L. Compared with the conventional activated sludge method, the high-concentration activated sludge method has very significant advantages, which are mainly reflected in the following aspects: (1) high treatment efficiency and good treatment effect; (2) large impact load bearing capacity and stable treatment effect; (3) it can reduce the discharge of residual sludge; (4) for newly built municipal sewage treatment plants, it can reduce the scale of biochemical engineering, save project investment, and reduce land occupation; (5) the existing municipal sewage treatment plants can transform the conventional activated sludge treatment process into the high-concentration activated sludge treatment process, which can greatly improve the treatment capacity and treatment effect, save a lot of project investment and project land, and greatly reduce energy consumption.

[0004] Mud and water separation is an important process unit in the biochemical treatment process of sewage. At present, there are three main methods of mud and water separation commonly used in biochemical treatment systems: (1) The biochemical treatment pool is equipped with a secondary sedimentation tank, which is used for gravity sedimentation separation of mud and water; the secondary sedimentation tank occupies a large area and requires a return pump to realize sludge return, so the mud and water separation project cost is high and the operating cost is high. (2) The biochemical treatment pool itself has the function of gravity sedimentation separation of mud and water, such as the SBR biochemical system; the SBR biochemical system has high automation control requirements and requires special drainage equipment, short drainage time, and has a large room for improvement in nitrogen and phosphorus removal effects, making optimization and upgrading more difficult. (3) The biochemical treatment pool is equipped with a membrane separation component, which is used for filtration and separation of mud and water, such as the MBR biochemical system; the membrane separation component of the MBR biochemical system is expensive, the membrane surface is easily blocked and needs to be continuously cleaned, the operating cost is high, and the operating power consumption is high.

[0005] The conventional activated sludge and water gravity sedimentation separation process has relatively strict conditions: (1) the water flow velocity is generally less than 6 mm / s; (2) there should be no obvious turbulence in the water; (3) there should be no obvious bubble rise interference in the water. During the biochemical treatment process, the biochemical treatment pool will carry out sewage push flow and aeration, and cannot directly carry out sludge and water gravity sedimentation separation.

[0006] In the prior art, utility model patent CN219469819U discloses a biochemical reaction pool, in which a sedimentation concentrator is installed and used. When the sewage push flow and aeration are stopped in the biochemical reaction pool, and the water body is in a static state, the sedimentation concentrator can accelerate the separation of mud and water, and the separated clean water is discharged from the biochemical reaction pool through a decanter. This patented technical solution can only perform mud and water separation intermittently, and cannot perform mud and water separation during the sewage push flow and aeration process in the biochemical reaction pool.

[0007] In the prior art, utility model patent CN219836149U discloses a sedimentation chamber, and invention patent CN110510737A discloses an enhanced activated sludge sewage treatment process. Both patented technologies utilize an inclined tube settler or an inclined plate settler to separate mud and water during the sewage push flow and aeration process in the biochemical reaction tank. When using a mud-water separation device with an inclined tube settler or an inclined plate settler, after a period of operation, the activated sludge in the sewage will adhere and accumulate on the surface of the inclined tube or inclined plate, causing the inclined tube or inclined plate to be blocked. In addition, there are problems such as algae growth, so it is necessary to stop production regularly and flush the inclined tube or inclined plate. The higher the concentration of activated sludge, the more serious the blockage of the inclined tube or inclined plate, and the shorter the blockage period, so the shorter the shutdown and flushing period, which seriously affects the continuous and stable operation of production.

[0008] The problem that the utility model intends to solve is to develop a biochemical pool equipped with a mud-water gravity sedimentation separation device, which can separate mud and water during sewage flow and aeration and directly discharge clean water, and has the ability to operate continuously and stably for a long time, low cost and low operating cost. Utility Model Content

[0009] The utility model aims to solve the deficiencies of the prior art and provide a biochemical pool capable of separating mud and water.

[0010] To achieve this purpose, the utility model adopts the following technical solutions:

[0011] A biochemical pool capable of separating mud and water comprises a biochemical pool body, an aeration device, and a mud and water separator. The aeration device and the mud and water separator are arranged inside the biochemical pool body. The mud and water separator comprises a working bridge, a power device, a rotating shaft, a bar bracket, a mud pressing plate, a shell, a water inlet, a water outlet and a mud outlet. The working bridge is provided with a power device, the power device is connected to the rotating shaft in a transmission manner, the rotating shaft is connected to the bar bracket, the bar bracket is connected to the mud pressing plate, the angle between the mud pressing plate and the horizontal plane is 3° to 87°, the sum of the projected areas of all the mud pressing plates arranged in the mud and water separator on the horizontal plane is greater than 8% of the projected area of ​​the shell on the horizontal plane, the outer edge linear speed of the mud pressing plate when rotating is less than 45 meters per minute, the shell is arranged below the working bridge, the rotating shaft and the bar bracket are at least partially arranged inside the shell, the shell is provided with a water inlet, a water outlet and a mud outlet, and the working bridge is connected to the biochemical pool body.

[0012] Preferably, the mud-water separator is provided with a stratification frame, the grid support is connected to the stratification frame, and the stratification frame is connected to a mud pressing plate.

[0013] Preferably, blocking members are provided at the water inlet and mud outlet of the mud-water separator.

[0014] Preferably, a notch is provided on the edge of the mud pressing plate.

[0015] Preferably, holes are distributed on the mud pressing plate.

[0016] Preferably, the mud-water separator comprises a static settler, and the static settler is arranged above the mud pressing plate.

[0017] Preferably, an overflow groove is provided at the inlet of the shell water outlet pipe.

[0018] Preferably, a reflective plate is provided on the rotating shaft, and the reflective plate is located above the water inlet.

[0019] Preferably, the mud-water separator is provided with a scraper, and the scraper is connected to a grid support.

[0020] Preferably, the shell is cylindrical, square or rectangular, and the shell side wall is made of metal sheet, plastic sheet, fiberglass, reinforced concrete, wooden sheet, biochemical pool body side wall and metal sheet, biochemical pool body side wall and plastic sheet, biochemical pool body side wall and fiberglass, biochemical pool body side wall and reinforced concrete, or biochemical pool body side wall and wooden sheet.

[0021] Preferably, the notch edge of the overflow trough is movably connected with an adjusting weir.

[0022] Based on the above technical solutions, the beneficial effects of the utility model are:

[0023] (1) The biochemical pool using the technology of the utility model can separate mud and water during the sewage push flow and aeration process, and the activated sludge is retained in the biochemical pool and directly discharged into the clean water.

[0024] (2) In the biochemical pool using the technology of the utility model, the mud-water separator without a static precipitator does not have the problem of clogging, does not need regular cleaning, and can operate continuously and stably for a long time; the mud-water separator with a static precipitator has a long clogging cycle and the clogging is not serious, so the regular flushing cycle is long and it can operate continuously and stably for a long time.

[0025] (3) In the biochemical pool using the technology of the utility model, the activated sludge is retained in the biochemical pool, and there is no need to set up a secondary sedimentation tank, configure a sludge return system, or perform sludge return, which saves project land, engineering investment, and electricity consumption for sludge return.

[0026] (4) By using the technology of the utility model, existing municipal sewage treatment plants can easily transform conventional activated sludge treatment processes into high-concentration activated sludge treatment processes, which can greatly improve treatment capacity and treatment effects, save a lot of engineering investment and project land, and significantly reduce energy consumption.

[0027] (5) The technology of this utility model can be used to optimize and upgrade the SBR biochemical system to improve the treatment effect.

[0028] (6) The use of this utility model technology in newly built municipal sewage treatment plants can significantly reduce project investment and project land use.

[0029] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 .

[0031] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 .

[0032] Figure 3 It is a partial structural schematic diagram of the utility model.

[0033] In the figure: biochemical pond body 10, aeration device 20, blower 201, gas delivery pipe 202, microporous aeration disk 203, mud-water separator 30, working bridge 31, power device 32, rotating shaft 33, reflecting plate 331, grid support 34, scraper 341, layering frame 35, mud pressing plate 36, notch 361, hole 362, shell 37, water inlet 371, water outlet 372, mud discharge port 373, overflow trough 374, regulating weir 375, buoy 376, blocking member 40, static precipitator 50, and flow pushing device 60. DETAILED DESCRIPTION

[0034] like Figure 1 , Figure 2 , Figure 3As shown, a biochemical pool capable of separating mud and water comprises a biochemical pool body 10, an aeration device 20, and a mud and water separator 30. The aeration device 20 and the mud and water separator 30 are arranged inside the biochemical pool body 10. The mud and water separator 30 comprises a working bridge 31, a power device 32, a rotating shaft 33, a grid support 34, a mud pressing plate 36, a shell 37, a water inlet 371, a water outlet 372 and a mud outlet 373. The working bridge 31 is provided with a power device 32, the power device 32 is transmission-connected to the rotating shaft 33, the rotating shaft 33 is connected to the grid support 34, and the grid support 34 A mud pressing plate 36 is connected, and the angle between the mud pressing plate 36 and the horizontal plane is 3° to 87°. The sum of the projected areas of all mud pressing plates 36 provided in the mud-water separator 30 on the horizontal plane is greater than 8% of the projected area of ​​the shell 37 on the horizontal plane. The outer edge linear speed of the mud pressing plate 36 during rotation is less than 45 m / min. The shell 37 is provided below the working bridge 31. The rotating shaft 33 and the bar support 34 are at least partially provided inside the shell 37. The shell 37 is provided with a water inlet 371, a water outlet 372 and a mud outlet 373. The working bridge 31 is connected to the biochemical pool body 10. In the utility model, there are a large number of microorganisms in the biochemical pool, which is a facility for microbial purification of sewage. Sewage flow and aeration are required during the biochemical treatment process. In the utility model, a flow-pushing device 60 is provided in the biochemical pool body 10. The flow-pushing device 60 is any one or more of a flow-pushing machine, a flow-pushing pump and an airlift flow-pushing device. In the utility model, an aeration device 20 is arranged inside the biochemical pool body 10, and the aeration device 20 is at least partially immersed in sewage. The function of the aeration device 20 is to inject oxygen into the sewage in the biochemical pool, so as to provide oxygen for the growth and reproduction of microorganisms and the purification of sewage. The aeration device 20 mainly includes a blast aeration device 20, a surface aeration device 20 and a submerged jet aeration device 20. The commonly used blast aeration device 20 is composed of a blower 201, a gas delivery pipe 202 and a microporous aeration disk 203 or a microporous aeration tube or a microporous aerator, the blower 201 is connected to one end of the gas delivery pipe 202, and the other end of the gas delivery pipe 202 is connected to the microporous aeration disk 203 or a microporous aeration tube or a microporous aerator. The commonly used surface aeration device 20 includes an inverted umbrella aerator and a rotating brush aerator. In the utility model, a mud-water separator 30 is arranged inside the biochemical pool body 10, and the mud-water separator 30 is at least partially immersed in sewage. The mud-water separator 30 is a device that can separate mud and water during the process of sewage push flow and aeration in the biochemical pool, and discharge clean water from the biochemical pool body 10. The mud-water separator 30 includes a working bridge 31, a power device 32, a rotating shaft 33, a grid support 34, a mud pressing plate 36, a shell 37, a water inlet 371, a water outlet pipe 372 and a mud outlet 373. The power device 32 is any one of a motor-driven power device 32, a hydraulic motor-driven power device 32, and a pneumatic motor-driven power device 32. The mud pressing plate 36 is any one or more of a metal plate, a plastic plate, a wooden plate, a metal screen, and a plastic screen.When the mud pressing plate 36 is made of metal, the rotating shaft 33 can be connected to the grid support 34 by welding or screw connection, and the grid support 34 can be connected to the mud pressing plate 36 by welding or screw connection. In the utility model, when the rotating shaft 33 drives the mud pressing plate 36 to rotate, it can promote the activated sludge contained in the sewage in the shell 37 to form larger flocs in a shorter time, can promote the flocs to sink at a faster speed, can promote the volume shrinkage of the flocs and the separation of water, so that in a shorter time, an obvious clear water layer appears in the shell 37. In the utility model, the grid support 34 is adopted, and the mud pressing plate 36 is connected to the grid support 34. While strengthening the structural rigidity of the mud pressing plate 36 and preventing deformation, it is also convenient to assemble the mud pressing plate 36; in addition, the rotating grid support 34 forms a small vortex behind the vertically arranged grid bars, which is conducive to the coagulation between the activated sludge particles, and creates cavities to destroy the sludge network structure and the stale state, so that the water and bubbles therein are easily separated, and the solid sedimentation is promoted. In the utility model, the angle between the mud pressing plate 36 and the horizontal plane is 3° to 87°, the sum of the projected areas of all the mud pressing plates 36 provided in the mud-water separator 30 on the horizontal plane is greater than 8% of the projected area of ​​the shell 37 on the horizontal plane, and the outer edge linear speed of the mud pressing plate 36 during rotation is less than 45 m / min, so the mud-water separator 30 can perform mud-water separation operations and can also perform activated sludge screening and discharge operations. Sludge with high activity has good sedimentation performance; sludge with poor activity has poor sedimentation performance, so the mud-water separator 30 can screen and discharge activated sludge by controlling the rotation speed of the mud pressing plate 36 and the amount of discharged water, discharge sludge with poor activity, and retain sludge with high activity. For normal mud-water separation in the biochemical pool, the outer edge linear speed of the mud pressing plate 36 during rotation is less than 5.6 m / min; for the screening and discharge of activated sludge in the biochemical pool, the outer edge linear speed of the mud pressing plate 36 during rotation is controlled to be 8-20 m / min; for the screening and discharge of activated sludge in the biochemical pool with the addition of inorganic powder carriers (such as bentonite), in order to reduce the loss of inorganic powder carriers, the mud pressing plate 36 needs a faster rotation speed to promote the separation of inorganic powder carriers and activated sludge. At this time, the outer edge linear speed of the mud pressing plate 36 during rotation is controlled to be 15-45 m / min. In the present utility model, the shell 37 is arranged below the working bridge 31, and the implementation methods are as follows: (1) the shell 37 is directly connected to the working bridge 31; (2) the shell 37 is connected to the working bridge 31 through a structural member; (3) the shell 37 is connected to the biochemical pool body 10, and the working bridge 31 is also connected to the biochemical pool body 10. The shell 37 is one of the key components of the utility model. The shell 37 can largely eliminate the influence of sewage flow and aeration, and create a relatively closed environment in the biochemical pool water body that is conducive to mud and water separation. In the utility model, the water inlet 371 is the channel for the sewage in the biochemical pool to enter the shell 37; the water outlet 372 is the channel for the clean water on the upper part of the mud and water separator 30 to be discharged from the biochemical pool body 10; the mud outlet 373 is the channel for the precipitated mud on the lower part of the shell 37 to be discharged from the shell 37.The water inlet 371 can be arranged on the side wall or bottom plate of the shell 37 located underwater. In a preferred embodiment, the water inlet 371 is arranged in the central area of ​​the bottom plate of the shell 37. When the sewage enters the shell 37 of the mud-water separator 30 through the water inlet 371, it rotates under the rotation of the rotating shaft 33, the grid support 34 and the mud pressing plate 36. Under the action of the rotating centrifugal force, the activated sludge in the sewage moves toward the side wall of the shell 37, thereby improving the efficiency of mud-water separation. The outlet pipe 372 can be arranged on the side wall of the shell 37 above the mud pressing plate 36. The mud discharge port 373 can be arranged on the bottom plate of the shell 37, or on the side wall of the shell 37 near the bottom plate of the shell 37. In the utility model, connecting plates can be arranged at both ends of the working bridge 31, so as to facilitate the connection of the working bridge 31 to the biochemical pool body 10, and also facilitate the connection and fixation between the working bridges 31. In the utility model, the interior of the mud-water separator 30 is a rotating and moving component, and there is no problem of activated sludge clogging, and regular cleaning is not required, and it can operate continuously and stably for a long time.

[0035] Specifically, Figure 1 , Figure 2 As shown, the mud-water separator 30 is provided with a layering frame 35, the bar bracket 34 is connected to the layering frame 35, and the layering frame 35 is connected to the mud pressing plate 36. In the utility model, the purposes of setting the layering frame 35 are: (1) a mounting notch is provided on the layering frame 35, and the mud pressing plate 36 is inserted into the mounting notch for screw fixation or welding, so that the installation of the mud pressing plate 36 can be completed quickly; (2) a mounting notch is provided on the layering frame 35, and after the mud pressing plate 36 is inserted into the mounting notch, the position and shape of the mud pressing plate 36 are fixed, ensuring that after long-term use, the angle between the mud pressing plate 36 and the horizontal plane does not change significantly.

[0036] Specifically, Figure 1 , Figure 2 , Figure 3As shown, a blocking member 40 is provided at the water inlet 371 and the mud outlet 373 of the mud-water separator 30. In the utility model, the shell 37 can largely eliminate the influence of sewage flow and aeration, and create a relatively closed environment that is conducive to mud-water separation in the water body of the biochemical pool. The water inlet 371 is a channel for sewage in the biochemical pool to enter the shell 37. The mud outlet 373 is a channel for the precipitated sludge at the bottom of the shell 37 to be discharged from the shell 37. The water inlet 371 and the mud outlet 373 are channels for the flow of sewage in the biochemical pool and aeration to affect the internal environment of the shell 37. The air injected into the sewage by aeration can enter the interior of the shell 37 through the water inlet 371, and then drive the sludge to rise to the water surface, seriously interfering with the separation of mud and water. In order to prevent the flow of sewage in the biochemical pool and aeration from interfering with the separation of mud and water inside the shell 37 through the water inlet 371, a blocking member 40 is provided at the water inlet 371. The mud outlet 373 is easily affected by the flow of sewage, causing the sludge to fall slowly and be easily blocked; the falling sludge and aeration produce convection, and the bubbles and part of the falling sludge are rushed into the shell 37 together, affecting the discharge of the sludge, thereby reducing the efficiency of the sludge discharge and affecting the mud-water separation effect. In order to prevent the flow of sewage and aeration in the biochemical pool from interfering with the mud-water separation inside the shell 37 through the mud outlet 373, and interfering with the process of the sludge at the bottom of the shell 37 falling back to the biochemical pool, a blocking member 40 is set at the mud outlet 373. In the utility model, the blocking member 40 is two inclined plates, or one inclined plate, or an elbow, or a cone. The blocking member 40 can be directly connected to the shell 37 or the water inlet 371 or the mud outlet 373, and can also be connected to the shell 37 or the water inlet 371 or the mud outlet 373 through a structural member.

[0037] Specifically, Figure 1 , Figure 2 As shown, the edge of the mud pressing plate 36 is provided with a notch 361. In the utility model, the edge of the mud pressing plate 36 is provided with a notch 361, and the opening direction of the notch 361 of the mud pressing plate 36 is opposite to the rotation direction of the mud pressing plate 36. The notch 361 has various shapes such as a V-shaped notch 361, a trapezoidal notch 361, a semi-elliptical notch 361, a square notch 361 and a rectangular notch 361. When the mud pressing plate 36 with the notch 361 on the rotating edge squeezes the activated sludge flocs below the mud pressing plate 36, more water and less flocs pass through the notch 361 of the mud pressing plate 36, resulting in a higher solid content of the sludge below the mud pressing plate 36 than the solid content of the sludge above the mud pressing plate 36. Therefore, the mud pressing plate 36 with the notch 361 has a better effect of promoting the separation of activated sludge and water than the mud pressing plate 36 without the notch 361.

[0038] Specifically, Figure 1 , Figure 2As shown, holes 362 are distributed on the mud pressing plate 36. In the utility model, holes 362 are distributed on the mud pressing plate 36, and the holes 362 are circular holes 362, or elliptical holes 362, or rectangular holes 362, or square holes 362, or polygonal holes 362. When the mud pressing plate 36 with holes 362 is rotated to squeeze the activated sludge flocs below the mud pressing plate 36, more water and less flocs pass through the holes 362 of the mud pressing plate 36, causing the solid content of the sludge below the mud pressing plate 36 to be higher than the solid content of the sludge above the mud pressing plate 36. Therefore, the mud pressing plate 36 with holes 362 has a better effect of promoting the separation of activated sludge and water than the mud pressing plate 36 without holes 362. The mud pressing plate 36 with holes 362 can be used as a biological carrier to enrich certain microorganisms and improve the sewage purification efficiency. The mud pressing plate 36 with holes 362 can be made of a metal perforated plate, a plastic perforated plate, a wooden perforated plate, a metal screen, or a plastic screen.

[0039] Specifically, Figure 1 , Figure 2 , Figure 3As shown, the mud-water separator 30 includes a static precipitator 50, and the static precipitator 50 is arranged above the mud pressing plate 36. In the utility model, under the rotation of the grid support 34 and the mud pressing plate 36, the sewage entering the mud-water separator 30 is quickly separated from the mud and water to obtain clean water containing a small amount of suspended solids, and the suspended solids (SS) content is less than 80 mg / L. In order to further reduce the content of suspended solids, a static precipitator 50 can be arranged above the mud pressing plate 36. The static precipitator 50 is an inclined tube precipitator, or an inclined plate precipitator, or a screen collector. The screen collector is formed by laying a screen along the direction of gravity, and the screen can be a metal screen or a plastic screen. Clean water containing a small amount of suspended solids enters the inclined tube sedimentation tank, and small-sized solids gather into large-sized solids in the inclined tube and then slide down, so that mud and water are separated efficiently; clean water containing a small amount of suspended solids rotates upward and collides with the screen collector. Under the interception of the screen, small-sized solids collide with each other, gather into large-sized solids, and then slide down, so that mud and water are separated efficiently. Therefore, after the clean water containing a small amount of suspended solids flows upward through the static sedimentation tank 50, clearer clean water can be obtained, and the suspended solids (SS) content is less than 20 mg / L. Since there are few solid particles entering the static sedimentation tank 50, the static sedimentation tank 50 has a long clogging period and the clogging is not serious, and the flushing period is long. In the utility model, sewage enters the shell 37 from the water inlet 371 below the mud-water separator 30, and the first high-efficiency mud-water separation is carried out through the rotation of the mud pressing plate 36 and the grid support 34. Most of the active sludge settles to the lower part of the shell 37 to form precipitated sludge, and is discharged from the mud-water separator 30 through the mud discharge port 373. The clean water containing a small amount of suspended solids rises and flows through the static sedimentator 50 to carry out the second high-efficiency mud-water separation. The mud pressing plate 36 and the static sedimentator 50 are used together to obtain clearer discharge water and reduce the processing pressure of the subsequent process.

[0040] Specifically, Figure 1 , Figure 2 , Figure 3 As shown, an overflow groove 374 is provided at the inlet of the water outlet pipe 372 of the housing 37. In the present utility model, the overflow groove 374 is generally provided above the mud pressing plate 36. The overflow groove 374 allows the clean water to overflow evenly in all directions and then be discharged from the biochemical pool body 10 through the water outlet pipe 372.

[0041] Specifically, Figure 1 , Figure 2 , Figure 3 As shown, a reflector 331 is disposed on the rotating shaft 33, and the reflector 331 is located above the water inlet 371. In the present invention, the reflector 331 is preferably mounted on the spiral shaft, and the conical surface of the reflector 331 faces downward. The sewage in the biochemical pool enters the housing 37 through the water inlet 371, and then passes through the reflector 331 and is evenly and slowly distributed on the cross section of the housing 37.

[0042] Specifically, Figure 1 , Figure 2 As shown, the mud-water separator 30 is provided with a scraper 341, and the scraper 341 is connected to the bar bracket 34. In the utility model, the mud pressing plate 36 has a certain effect of pushing the precipitated sludge, but the efficiency of pushing the precipitated sludge at the lower part of the shell 37 to the mud discharge port 373 is not very high, so a scraper 341 is provided at the lower part of the shell 37, and the scraper 341 is connected to the bar bracket 34. The rotating rotating shaft 33 drives the bar bracket 34 to rotate, and then drives the scraper 341 to rotate and move. Under the push of the scraper 341 to rotate, the precipitated sludge is discharged from the shell 37 through the mud discharge port 373 and enters the biochemical pool body 10.

[0043] Specifically, Figure 1 , Figure 2 , Figure 3 As shown, the shell 37 is cylindrical or square or rectangular, and the side wall of the shell 37 is made of metal sheet, plastic sheet, glass fiber reinforced plastic, reinforced concrete, wooden sheet, biochemical pool body 10 side wall and metal sheet, biochemical pool body 10 side wall and plastic sheet, biochemical pool body 10 side wall and glass fiber reinforced plastic, biochemical pool body 10 side wall and reinforced concrete, or biochemical pool body 10 side wall and wooden sheet. In the utility model, the material of the metal sheet can be any one or more of carbon steel, carbon steel lined rubber, carbon steel lined plastic, carbon steel lined enamel, carbon steel lined glass fiber reinforced plastic, stainless steel. The material of the plastic sheet can be any one or more of PVC, PP, ABS, PE, PC, HDPE, PMMA, PET, PS, and glass fiber reinforced plastic. The material of the biochemical pool body 10 can be any one or more of reinforced concrete, carbon steel, carbon steel lined rubber, carbon steel lined plastic, carbon steel lined enamel, carbon steel lined glass fiber reinforced plastic, stainless steel, and glass fiber reinforced plastic.

[0044] Specifically, Figure 1 , Figure 2 , Figure 3 As shown, the edge of the notch of the overflow trough 374 is movably connected with an adjusting weir 375. In the present utility model, the adjusting weir 375 can be connected to a float 376. The float 376 can be arranged inside the shell 37 and directly connected to the adjusting weir 375; the float 376 can also be arranged outside the shell 37 and connected to the adjusting weir 375 through a connecting rod. The adjusting weir 375 moves up and down as the water level in the biochemical pool body 10 changes, thereby adjusting the depth of the overflow trough 374.

[0045] like Figure 1 , Figure 2 , Figure 3 As shown, the basic working process of the utility model is:

[0046] (1) Sewage Purification Sewage enters the biochemical pool body 10 through a pipeline. The sewage in the biochemical pool body 10 flows and diffuses under the action of a flow promoter. Air enters the sewage in the biochemical pool body 10 through an aeration device 20, providing oxygen for the growth and reproduction of microorganisms and purification of sewage.

[0047] (2) Mud-water separation and clean water discharge The sewage enters the shell 37 through the water inlet 371 of the mud-water separator 30 , and then passes through the reflector 331 and is evenly and slowly distributed on the cross section of the shell 37 . The power device 32 drives the rotating shaft 33 to rotate, and then drives the grid support 34 and the mud pressing plate 36 to rotate, and then drives the sewage to rotate; under the action of centrifugal force, the activated sludge contained in the rotating sewage moves toward the side wall of the shell 37, thereby improving the efficiency of mud-water separation; the rotating mud pressing plate 36 can promote the activated sludge contained in the sewage in the shell 37 to form larger flocs in a shorter time, which can cause the flocs to sink at a faster speed and promote the volume shrinkage of the flocs and separation from water; the rotating grid support 34 forms a small vortex behind the vertically arranged grid bars, which is conducive to the coagulation between the activated sludge particles, and creates cavities to destroy the sludge network structure and the sticky state, so that the water and bubbles therein are easily separated, and the solid sedimentation is promoted. Therefore, in a shorter time, the sewage undergoes the first efficient mud-water separation, and an obvious clear water layer containing a small amount of suspended solids appears above the mud pressing plate 36 inside the shell 37, and the precipitated sludge is settled below the shell 37. The clean water containing a small amount of suspended solids flows upward through the static precipitator 50 for a second efficient mud-water separation. A small amount of suspended solids is intercepted by the static precipitator 50, and clear water flows out from the top of the static precipitator 50. The clean water is discharged from the biochemical pool body 10 through the outlet pipe 372 of the mud-water separator 30. The precipitated sludge settled to the lower part of the shell 37 is driven by the rotation of the scraper 341 and discharged from the shell 37 through the sludge outlet 373, and falls back into the biochemical pool body 10 to continue to participate in the sewage purification process.

[0048] (3) Activated sludge discharge: A portion of the activated sludge in the biochemical pool body 10 is continuously or periodically discharged through a pipeline to control the activated sludge concentration.

[0049] In the description of the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In the present invention, unless otherwise clearly defined and specified, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The above is a specific implementation method of the utility model, which is only used to illustrate the technical solution of the utility model rather than to limit it. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A biochemical pool capable of separating mud and water, characterized in that: It includes a biochemical pool body, an aeration device, and a mud-water separator. The aeration device and the mud-water separator are arranged inside the biochemical pool body. The mud-water separator includes a working bridge, a power device, a rotating shaft, a grid support, a mud pressing plate, a shell, a water inlet, a water outlet and a mud outlet. The working bridge is provided with a power device. The power device is connected to the rotating shaft in a transmission manner. The rotating shaft is connected to the grid support. The grid support is connected to the mud pressing plate. The angle between the mud pressing plate and the horizontal plane is 3° to 87°. The sum of the projected areas of all the mud pressing plates arranged on the mud-water separator on the horizontal plane is greater than 8% of the projected area of ​​the shell on the horizontal plane. The outer edge linear speed of the mud pressing plate during rotation is less than 45 meters per minute. The shell is arranged below the working bridge. The rotating shaft and the grid support are at least partially arranged inside the shell. The shell is provided with a water inlet, a water outlet and a mud outlet. The working bridge is connected to the biochemical pool body.

2. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: The mud-water separator is provided with a stratification frame, the grid support is connected to the stratification frame, and the stratification frame is connected to a mud pressing plate.

3. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: Blocking parts are arranged at the water inlet and mud outlet of the mud-water separator.

4. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: The edge of the mud pressing plate is provided with a notch.

5. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: The mud pressing plate is provided with holes distributed thereon.

6. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: The mud-water separator comprises a static settler, and the static settler is arranged above the mud pressing plate.

7. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: An overflow groove is arranged at the inlet of the shell water outlet pipe.

8. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: A reflective plate is arranged on the rotating shaft, and the reflective plate is located above the water inlet.

9. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: The mud-water separator is provided with a scraper, and the scraper is connected to the grid support.

10. A biochemical pool capable of separating mud and water according to claim 1, characterized in that: The shell is cylindrical, square or rectangular, and the shell side wall is made of metal plate, plastic plate, fiberglass, reinforced concrete, wooden plate, biochemical pool body side wall and metal plate, biochemical pool body side wall and plastic plate, biochemical pool body side wall and fiberglass, biochemical pool body side wall and reinforced concrete, or biochemical pool body side wall and wooden plate.

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