Sewage treatment system

Abstract

A sewage treatment system comprises an adjusting tank, a hydrolysis acidification tank and a contact oxidation tank, the adjusting tank comprises a tank body (1), a stirring shaft (2) and an aeration pipe set (3), a set of stirring blades are arranged on the stirring shaft (2), the stirring shaft (2) is installed in the tank body (1), the stirring shaft (2) is driven by a motor to rotate, and a set of water inlet bent pipes (4) are arranged at the top of one side of the tank body (1); the regulating tank has the advantages that the regulating tank adopts a horizontal stirring mode, the stirring speed is high, and stains are not easy to adhere to the inner wall of the tank body. The hydrolysis acidification pool adopts a stirring mode of matching aeration and stirring blades, so that the stirring and mixing efficiency is higher, and the stirring time is shortened.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment equipment, in particular to a sewage treatment system. Background Art

[0002] Currently, sewage regulating tanks are a crucial component of sewage treatment systems, used to balance and regulate the flow and quality of sewage entering the treatment process. These tanks involve regulating sewage flow and quality, designing circulation systems, and handling sludge. Through rational design and operational management, stable operation and efficient treatment can be achieved. Currently, to maintain a uniform distribution of suspended solids in the sewage and avoid uneven sewage quality, a stirring device is typically installed within the regulating tank. Existing stirring devices are mostly mobile vertical agitators, which have numerous transmission components, a complex installation process, and high costs.

[0003] Hydrolysis and acidification treatment is primarily used to remove suspended matter from wastewater and improve its biodegradability, thereby reducing the burden on subsequent biochemical treatment processes. Hydrolysis and acidification tanks have been widely used in the treatment of printing and dyeing, pharmaceuticals, chemicals, and municipal wastewater, achieving excellent results. The hydrolysis and acidification process primarily relies on rapid and uniform mixing of sludge and wastewater to rapidly capture and adsorb particulate and colloidal matter in the influent. Because sludge contains a high concentration of facultative microorganisms, under the anoxic conditions of the tank, trapped organic matter is hydrolyzed by a large number of hydrolytic and acidifying bacteria, converting insoluble organic matter into soluble substances and converting macromolecular, non-biodegradable substances into readily biodegradable ones. Existing hydrolysis and acidification tanks have long stirring times, preventing rapid and uniform mixing of sludge and wastewater, prolonging treatment time and making it difficult to remove the precipitated sludge after hydrolysis and acidification.

[0004] One of the essences of biological contact oxidation treatment technology is to fill the tank with filler, immerse the entire filler with oxygenated sewage, and flow through the filler at a certain flow rate, forming a biofilm on the filler. The sewage and the biofilm are in extensive contact, and under the action of the metabolic function of the microorganisms on the biofilm, the organic pollutants in the sewage are removed and the sewage is purified. Therefore, biological contact oxidation treatment technology is also called "submerged biofilter". Another essence is to use the same aeration method as the aeration tank, installing the aerator at the bottom of the tank to provide the microorganisms with the oxygen they need and play a stirring and mixing role. In this way, this technology is equivalent to filling the aeration tank with filler for microbial habitation, so it is also called "contact aeration method". The main feature of biological contact oxidation method is that it uses filler with high porosity and large specific surface area immersed in water to provide an aerobic biofilm on its surface for microorganisms to attach and grow. Due to its large surface area, a large amount of biomass can be attached. At the same time, due to its high porosity, the entry of substrate and the removal of metabolic products, as well as the self-renewal and shedding of biofilm, are relatively smooth, so that the biofilm can maintain high activity and high biochemical reaction rate. It is difficult to replace the biofilm fillers in existing contact oxidation tanks, and a large amount of biofilm fillers need to be taken out at the same time before replacement. Utility Model Content

[0005] The purpose of this utility model is to provide a sewage treatment system to address the above-mentioned deficiencies.

[0006] The utility model includes a regulating tank, a hydrolysis acidification tank and a contact oxidation tank.

[0007] The regulating tank includes the tank body, stirring shaft and aeration pipe group.

[0008] A set of stirring blades is provided on the stirring shaft, which is installed in the tank body and is driven to rotate by the motor. A set of water inlet elbows is provided on the top of one side of the tank body, and the outlet end of the water inlet elbow faces the bottom surface of the tank body. A drainage pipe is provided at the lower part of the side wall of the tank body, and the aeration pipe group is installed on the bottom surface of the tank body.

[0009] The hydrolysis acidification tank includes a hydrolysis acidification tank body, a stirring device and a sewage sedimentation tank.

[0010] The stirring device is installed in the hydrolysis and acidification tank body, and the sewage in the hydrolysis and acidification tank body is mixed evenly by the stirring device. The sewage sedimentation tank is located on one side of the hydrolysis and acidification tank body. The hydrolysis and acidification tank body is provided with a sewage pump, and the sewage in the hydrolysis and acidification tank body is pumped out to the sewage sedimentation tank by the sewage pump. The bottom of the sewage sedimentation tank is an inclined surface, and a sludge concentration tank is provided at the bottom of the lower end of the sewage sedimentation tank. A sewage pumping pipe is provided on the wall of the sewage sedimentation tank on one side of the sludge concentration tank.

[0011] The contact oxidation tank consists of an oxidation tank body, a set of filler barrel racks, an aeration pipe and a water inlet pipe.

[0012] The top of the oxidation tank is provided with an outlet channel, one side of the outlet channel is provided with a drain outlet, the bottom of the oxidation tank is provided with a sludge discharge outlet, a barrel bracket is provided on the upper inner wall of the oxidation tank, a group of filler barrel racks are arranged in sequence and installed in the barrel bracket, the filler barrel racks are filled with biofilm fillers, the water inlet pipe is installed at the bottom of the filler barrel rack, and the aeration pipe is installed between the filler barrel rack and the aeration pipe;

[0013] The drainage pipe is connected to the inner cavity of the hydrolysis acidification tank through a water pipe. A supernatant discharge outlet is provided on the upper wall of the sewage sedimentation tank. The supernatant discharge outlet is connected to a water pump through a pipe, and the water pump outlet is connected to the water inlet pipe.

[0014] The stirring blades on the stirring shaft are composed of a pair of three-blade stirring blades and a two-blade stirring blade, and the two-blade stirring blade is located between the pair of three-blade stirring blades; the blades of the three-blade stirring blade are T-shaped.

[0015] A group of water inlet elbows are arranged in sequence on the top of one side of the pool body through pipe brackets; the aeration pipe group consists of a main pipe and a pair of side pipes, which are installed on the main pipe in a mirror-image distribution. Multiple groups of branch aeration pipes are arranged in sequence on the main pipe, and multiple groups of aeration heads are provided on the side pipes and branch aeration pipes.

[0016] A sampling support plate is provided on the top of the pool body; a pH regulating pipe is provided on one side of the sampling support plate, and a valve is provided on the pH regulating pipe; and a valve is provided on the water inlet elbow.

[0017] The stirring device includes a hollow shaft, a rotary joint and a chain transmission mechanism. An air inlet at one end of the hollow shaft is connected to an air outlet of the rotary joint. The hollow shaft is sealably installed in the hydrolysis acidification tank body. A group of stirring blades are provided on the hollow shaft. An air transmission channel connected to the inner cavity of the hollow shaft is opened in the stirring blades. A group of hollow rods are arranged in sequence on the stirring blades. An aeration nozzle is provided at one end of the hollow rods. The inner cavity of the hollow rods is connected to the air transmission channel of the stirring blades. A shaft drive motor drives the hollow shaft to rotate through the chain transmission mechanism. A motor bracket is provided on the wall of the hydrolysis acidification tank body. The shaft drive motor is installed on the motor bracket. The large sprocket of the chain transmission mechanism is installed on the hollow shaft. The small sprocket of the chain transmission mechanism is installed on the power output shaft of the shaft drive motor. The air inlet of the rotary joint is connected to the air outlet of the gas compressor through a pipeline.

[0018] The suction pipe of the sewage pump is vertically downward close to the bottom surface of the hydrolysis and acidification tank body, and the outlet pipe of the sewage pump is located above the sewage sedimentation tank; a U-shaped water pump bracket is provided on the top of the hydrolysis and acidification tank body, and the sewage pump is installed on the U-shaped water pump bracket; the sewage suction pipe is connected to the inlet end of the sludge pump.

[0019] The connection between the sludge collection tank and the bottom of the sewage sedimentation tank is a sloped surface.

[0020] The packing barrel frame includes a top plate, a bottom plate, a group of connecting rods and an upper pressure plate. The top plate is annular, and multiple groups of water-permeable holes are opened on the bottom plate. A group of connecting rods are evenly installed in a ring between the top plate and the bottom plate, and the upper pressure plate is installed on the top plate by bolts; a guide rod is provided in the packing barrel frame, a limiting ring is provided at the lower part of the guide rod, and a shaft sleeve is provided in the middle of the bottom plate. The bottom of the guide rod is located in the shaft sleeve, and the limiting ring is against the top of the shaft sleeve. A group of packing mounting plates are arranged in sequence on the guide rod, and the biofilm packing is installed on the packing mounting plate. A guide hole is opened in the middle of the upper pressure plate, and the top of the guide rod is located in the guide hole; the packing mounting plate is composed of an inner ring, an outer ring, a sleeve and a group of connecting frames. A group of connecting frames are evenly installed in a ring on the outer wall of the sleeve with the sleeve as the center. A group of packing mounting grooves are evenly opened in a ring on the inner ring and the outer ring. The biofilm packing is installed in the packing mounting groove, and the inner ring and the outer ring are installed on a group of connecting frames from the inside to the outside, and the sleeve is sleeved on the guide rod; fixing plates are respectively provided at both ends of the top plate, and are detachably mounted on the barrel body bracket through the fixing plates.

[0021] The aeration pipe is installed in the oxidation tank body through a grid bracket, and the air inlet of the aeration pipe is connected with the air compressor output through a pipe.

[0022] A set of water outlets is provided on the water inlet pipe, and the water outlets are located at the lower part between two adjacent filling barrel racks; valves are respectively provided on the drain outlet of the outlet channel, the sludge outlet of the oxidation tank body, the aeration pipe and the water inlet pipe.

[0023] The utility model has the advantages that the regulating tank adopts a horizontal stirring mode, the stirring speed is fast, and stains are not easy to adhere to the wall of the tank body.

[0024] The hydrolysis acidification tank adopts a stirring method that combines aeration and stirring blades to make the stirring and mixing efficiency higher and reduce the stirring time. The sludge is settled in the sludge collection tank for centralized discharge.

[0025] The biofilm filler of the contact oxidation tank can be replaced quickly, and a small amount of biofilm filler at the corresponding position can be taken out as needed, and the contact oxidation tank has a fast reaction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the regulating tank of the utility model.

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the regulating tank of the utility model.

[0028] Figure 3 It is a structural schematic diagram of the stirring shaft of the regulating tank of the utility model.

[0029] Figure 4 It is a structural diagram of the aeration pipe group of the regulating tank of the utility model.

[0030] Figure 5 It is a schematic diagram of the overhead structure of the hydrolysis and acidification tank of the utility model.

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of the sewage sedimentation tank of the utility model.

[0032] Figure 7 It is a structural diagram of the hydrolysis and acidification tank body of the utility model.

[0033] Figure 8 It is a schematic diagram of the structure of the stirring device of the hydrolysis acidification tank of the utility model.

[0034] Figure 9 It is a schematic diagram of the structure of a sewage pump for a hydrolysis and acidification tank of the utility model.

[0035] Figure 10 It is a structural schematic diagram of the contact oxidation tank of the utility model.

[0036] Figure 11 The utility model is a structural schematic diagram of a filler barrel rack installed on a barrel body bracket.

[0037] Figure 12 It is a structural schematic diagram of the filler barrel rack of the present utility model.

[0038] Figure 13 It is a structural schematic diagram of the utility model when a guide rod is placed into a filling barrel frame.

[0039] Figure 14 It is a structural schematic diagram of the filler installation disk of the utility model. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0043] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "inner," "outer," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. These terms are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limitations on the present invention. In addition, if the terms "first," "second," etc. appear in the description of the present invention, they are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0045] As shown in the attached drawings, the utility model includes a regulating tank, a hydrolysis acidification tank and a contact oxidation tank.

[0046] The regulating tank includes a tank body 1, a stirring shaft 2 and an aeration pipe group 3.

[0047] A stirring shaft 2 is provided with a group of stirring blades, and the stirring shaft 2 is installed in the tank body 1. The stirring shaft 2 is driven to rotate by the motor. A group of water inlet elbows 4 is provided on the top of one side of the tank body 1. The outlet end of the water inlet elbow 4 faces the bottom surface of the tank body 1. A drainage pipe 5 is provided at the lower part of the side wall of the tank body 1. The aeration pipe group 3 is installed on the bottom surface of the tank body 1.

[0048] The hydrolysis and acidification tank includes a hydrolysis and acidification tank body 20, a stirring device and a sewage sedimentation tank 21.

[0049] A stirring device is installed in the hydrolysis and acidification tank body 20, and the sewage in the hydrolysis and acidification tank body 20 is evenly mixed by the stirring device. The sewage sedimentation tank 21 is located on one side of the hydrolysis and acidification tank body 20. A sewage pump 22 is provided on the hydrolysis and acidification tank body 20, and the sewage in the hydrolysis and acidification tank body 20 is pumped into the sewage sedimentation tank 21 by the sewage pump 22. The bottom of the sewage sedimentation tank 21 is inclined, and a sludge concentration tank 23 is provided at the bottom of the lower end of the sewage sedimentation tank 21. A sewage extraction pipe 24 is provided on the wall of the sewage sedimentation tank 21 on one side of the sludge concentration tank 23.

[0050] The contact oxidation tank includes an oxidation tank body 50, a set of filler barrel racks 51, an aeration pipe 52 and a water inlet pipe 53.

[0051] The oxidation tank body 50 is provided with an outlet channel 54 at the top, a drain outlet is provided on one side of the outlet channel 54, and a sludge outlet is provided at the bottom of the oxidation tank body 50. A barrel bracket 55 is provided on the upper inner wall of the oxidation tank body 50. A group of filler barrel racks 51 are arranged in sequence and installed in the barrel bracket 55. The filler barrel racks 51 are filled with biofilm filler. The water inlet pipe 53 is installed at the bottom of the filler barrel rack 51, and the aeration pipe 52 is installed between the filler barrel rack 51 and the aeration pipe 52.

[0052] The drainage pipe 5 is connected to the inner cavity of the hydrolysis and acidification tank body 20 through a water pipe. A supernatant discharge outlet is provided on the upper wall of the sewage sedimentation tank 21. The supernatant discharge outlet is connected to a water pump through a pipe, and the water pump outlet is connected to the water inlet pipe 53.

[0053] The stirring blades on the stirring shaft 2 are composed of a pair of three-blade stirring paddles 6 and a two-blade stirring paddle 7. The two-blade stirring paddle 7 is located between the pair of three-blade stirring paddles 6. The blades of the three-blade stirring paddle 6 are T-shaped.

[0054] A group of water inlet elbows 4 are arranged in sequence on the top of one side of the tank body 1 through pipe brackets; the aeration pipe group 3 consists of a main pipe 8 and a pair of side pipes 9, and the pair of side pipes 9 are installed on the main pipe 8 in a mirror-image distribution. A plurality of groups of branch aeration pipes 10 are arranged in sequence on the main pipe 8, and a plurality of groups of aeration heads are provided on the side pipes 9 and the branch aeration pipes 10.

[0055] A sampling support plate 11 is provided on the top of the pool body 1; a pH regulating pipe 12 is provided on one side of the sampling support plate 11, and a valve is provided on the pH regulating pipe 12; a valve is provided on the water inlet elbow 4.

[0056] The stirring device includes a hollow shaft 25, a rotary joint 26 and a chain transmission mechanism 27. The air inlet at one end of the hollow shaft 25 is connected to the air outlet of the rotary joint 26. The hollow shaft 25 is movable and sealed and installed in the hydrolysis acidification tank body 20. A group of stirring blades 28 are provided on the hollow shaft 25. The stirring blades 28 have an air transmission channel connected to the inner cavity of the hollow shaft 25. A group of hollow rods 29 are arranged in sequence on the blades of the stirring blades 28. An aeration nozzle is provided at one end of the hollow rods 29. The inner cavity of the core rod 29 is connected to the gas transmission channel of the stirring blade 28, and the shaft drive motor 31 drives the hollow shaft 25 to rotate through the chain transmission mechanism 27; a motor bracket is provided on the wall of the hydrolysis acidification tank body 20, the shaft drive motor 31 is installed on the motor bracket, the large sprocket of the chain transmission mechanism 27 is installed on the hollow shaft 25, and the small sprocket of the chain transmission mechanism 27 is installed on the power output shaft of the shaft drive motor 31; the air inlet of the rotary joint 26 is connected to the air outlet of the gas compressor through a pipeline.

[0057] The suction pipe of the sewage pump 22 is vertically downward close to the bottom surface of the hydrolysis and acidification tank body 20, and the outlet pipe of the sewage pump 22 is located above the sewage sedimentation tank 21; a U-shaped water pump bracket 32 is provided on the top of the hydrolysis and acidification tank body 20, and the sewage pump 22 is installed on the U-shaped water pump bracket 32; the sewage suction pipe 24 is connected to the inlet end of the sludge pump.

[0058] The connection between the sludge concentration tank 23 and the bottom surface of the sewage sedimentation tank 21 is a slope surface 30 .

[0059] The stuffing barrel frame 51 includes a top plate 56, a bottom plate 57, a group of connecting rods 58 and an upper pressure plate 59. The top plate 56 is annular, and a plurality of water-permeable holes are opened on the bottom plate 57. A group of connecting rods 58 are evenly distributed in an annular shape between the top plate 56 and the bottom plate 57, and the upper pressure plate 59 is installed on the top plate 56 by bolts; a guide rod 60 is provided in the stuffing barrel frame 51, and a limit ring 61 is provided at the lower part of the guide rod 60. A shaft sleeve is provided in the middle of the bottom plate 57. The bottom of the guide rod 60 is located in the shaft sleeve, and the limit ring 61 is against the top of the shaft sleeve. A group of stuffing mounting disks 62 are arranged in sequence on the guide rod 60, and the biofilm stuffing is installed on the stuffing mounting disk 62. A guide hole is opened in the middle of the pressure plate 59, and the top of the guide rod 60 is located in the guide hole; the filler mounting plate 62 is composed of an inner ring 63, an outer ring 64, a sleeve 65 and a group of connecting skeletons 66. A group of connecting skeletons 66 are evenly installed on the outer wall of the sleeve 65 with the sleeve 65 as the center. A group of filler mounting grooves are evenly distributed on the inner ring 63 and the outer ring 64. The biofilm filler is installed in the filler mounting groove. The inner ring 63 and the outer ring 64 are installed on a group of connecting skeletons 66 from the inside to the outside, and the sleeve 65 is sleeved on the guide rod 60; fixing plates 67 are respectively provided at both ends of the top plate 56, and are detachably mounted on the barrel body bracket 55 through the fixing plates 67.

[0060] The aeration pipe 52 is installed in the oxidation tank body 50 through a grid support, and the air inlet of the aeration pipe 52 is connected to the air compressor output port through a pipe.

[0061] The water inlet pipe 53 is provided with a group of water outlets, which are located at the lower part between two adjacent filling barrel racks 51; the drainage outlet of the outlet channel 54, the sludge discharge outlet of the oxidation tank body 50, the aeration pipe 52 and the water inlet pipe 53 are respectively provided with valves.

[0062] Example 1: Sewage from different production areas is discharged into the tank body 1 through the corresponding water inlet bend 4. The motor drives the stirring shaft 2 to rotate. The stirring shaft 2 is movably mounted on the inner wall of the tank body 1 through a mechanical seal to ensure that no water leaks out while the stirring shaft 2 rotates. The sewage in the tank body 1 is continuously stirred by the three-blade stirring paddle 6 and the two-blade stirring paddle 7. At the same time, compressed air is sprayed through the aeration pipe group 3 to form bubbles in the sewage. The bubbles carry the pollutants in the sewage to the top layer. When the pH value in the tank body 1 needs to be adjusted, the corresponding reagent is added through the pH adjustment pipe 12 for adjustment. The staff can stand on the sampling support plate 11 to observe the sewage condition in the tank body 1 and use the sampling tool to take samples. The mixed sewage in the tank body 1 can be discharged through the drainage pipe 5 and enter the next treatment station.

[0063] The blades of the three-blade stirring paddle 6 are T-shaped, which increases the vortex at the end of the three-blade stirring paddle 6 and makes the stirring effect better. The stirring paddles with better stirring effect at both ends can prevent stains from sticking to the inner walls of the pool body 1.

[0064] The bubbles ejected through the pair of side pipes 9 can lift the pollutants attached to the side wall of the tank body 1 upwards, thereby reducing the speed at which the pollutants adhere.

[0065] The main pipeline 8 is connected to the air outlet of the air compressor. The compressed air output by the air compressor is transported to the side pipe 9 and the branch aeration pipe 10 through the main pipeline 8, and then sprayed out through the aeration head.

[0066] The sewage from the equalization tank is pumped into the hydrolysis and acidification tank 20. A shaft drive motor 31 rotates the hollow shaft 25 from the side via a chain drive mechanism 27. This agitation is achieved through the stirring blades 28 and the hollow rods 29 attached thereto. Simultaneously, compressed gas (such as carbon dioxide) from the gas compressor enters the rotary joint 26. While the hollow shaft 25 rotates, the rotary joint 26 delivers compressed gas into the hollow shaft 25. The compressed gas then enters the gas delivery channels within the stirring blades 28 and is finally ejected through the aeration nozzles on the hollow rods 29, forming bubbles within the sewage and aiding agitation. After the sewage is acidified and agitated in the hydrolysis and acidification tank, the sewage pump 22 is activated to pump the sewage from the hydrolysis and acidification tank 20 into the sewage sedimentation tank 21 for sedimentation. After sedimentation is complete, the sludge pump is activated to pump the fluid sludge from the sludge collection tank 23 to a filter press for treatment. Hard sludge adhering to the inner walls of the sewage sedimentation tank 21 is regularly cleaned manually. The supernatant in the sewage sedimentation tank 21 is pumped out to the contact oxidation tank by a water pump.

[0067] The staff stuffs the flocculent biofilm filler into the filler installation groove, and then wraps it around the inner ring 63 and the outer ring 64. After the installation is completed, a set of filler installation plates 62 are put on the guide rod 60 in turn. The staff grabs the top of the guide rod 60 and places the guide rod 60 into the filler barrel rack 51. The bottom of the guide rod 60 is inserted into the shaft sleeve of the chassis 57. The guide rod 60 remains vertical and the upper pressure plate 59 is installed on the top plate 56. The top of the guide rod 60 is located in the guide hole of the upper pressure plate 59.

[0068] Sewage is injected into the oxidation tank 50 through the water inlet pipe 53. Compressed air is introduced through the aeration pipe 52, generating bubbles in the sewage, which acts as agitator and oxygenator. The biofilm attached to the biofilm packing absorbs and disinfects organic pollutants in the sewage. The purified sewage is located at the top of the oxidation tank 50, overflows into the outlet channel 54, and is then transported to the next treatment station through the drain port. The generated sludge is deposited at the bottom of the oxidation tank 50 and discharged through the sludge outlet. When the biofilm packing needs to be replaced, the upper pressure plate 59 is removed from the top plate 56, and the guide rod 60 is then withdrawn to replace the biofilm packing.

Claims

1. A sewage treatment system, characterized in that Including regulating tank, hydrolysis acidification tank and contact oxidation tank, The regulating tank comprises a tank body (1), a stirring shaft (2) and an aeration pipe group (3). A group of stirring blades is provided on the stirring shaft (2), which is installed in the tank body (1). The stirring shaft (2) is driven to rotate by the motor. A group of water inlet elbows (4) is provided on the top of one side of the tank body (1), and the outlet end of the water inlet elbow (4) faces the inner bottom surface of the tank body (1). A drainage pipe (5) is provided at the lower part of the side wall of the tank body (1). The aeration pipe group (3) is installed on the inner bottom surface of the tank body (1); The hydrolysis and acidification tank comprises a hydrolysis and acidification tank body (20), a stirring device and a sewage sedimentation tank (21). The stirring device is installed in the hydrolysis and acidification tank body (20), and the sewage in the hydrolysis and acidification tank body (20) is mixed uniformly by the stirring device. The sewage sedimentation tank (21) is located on one side of the hydrolysis and acidification tank body (20). The hydrolysis and acidification tank body (20) is provided with a sewage pump (22). The sewage in the hydrolysis and acidification tank body (20) is pumped into the sewage sedimentation tank (21) by the sewage pump (22). The bottom of the sewage sedimentation tank (21) is an inclined surface. A sludge concentration tank (23) is provided at the bottom of the lower end of the sewage sedimentation tank (21). A sewage extraction pipe (24) is provided on the wall of the sewage sedimentation tank (21) on one side of the sludge concentration tank (23). The contact oxidation tank comprises an oxidation tank body (50), a group of filler barrel racks (51), an aeration pipe (52) and a water inlet pipe (53). The top of the oxidation tank body (50) is provided with a water outlet (54), one side of the water outlet (54) is provided with a drain outlet, the bottom of the oxidation tank body (50) is provided with a sludge discharge outlet, a barrel bracket (55) is provided on the inner wall of the upper part of the oxidation tank body (50), a group of filling barrel racks (51) are arranged in sequence and installed in the barrel bracket (55), the filling barrel racks (51) are filled with biofilm fillers, the water inlet pipe (53) is installed at the lower part of the filling barrel rack (51), and the aeration pipe (52) is installed between the filling barrel rack (51) and the aeration pipe (52); The drainage pipe (5) is connected to the inner cavity of the hydrolysis and acidification tank (20) through a water pipe. A supernatant discharge outlet is provided on the upper wall of the sewage sedimentation tank (21). The supernatant discharge outlet is connected to a water pump through a pipe. The water outlet of the water pump is connected to the water inlet pipe (53).

2. A sewage treatment system according to claim 1, characterized in that: The stirring blades on the stirring shaft (2) are composed of a pair of three-blade stirring blades (6) and a two-blade stirring blade (7), and the two-blade stirring blade (7) is located between the pair of three-blade stirring blades (6); the blades of the three-blade stirring blade (6) are T-shaped.

3. A sewage treatment system according to claim 1, characterized in that: A group of water inlet elbows (4) are arranged in sequence on the top of one side of the tank body (1) through pipe brackets; an aeration pipe group (3) is composed of a main pipe (8) and a pair of side pipes (9); the pair of side pipes (9) are installed on the main pipe (8) in a mirror-image distribution; a plurality of groups of branch aeration pipes (10) are arranged in sequence on the main pipe (8); and a plurality of groups of aeration heads are provided on the side pipes (9) and the branch aeration pipes (10).

4. A sewage treatment system according to claim 1, characterized in that: A sampling support plate (11) is provided on the top of the pool body (1); a pH regulating pipe (12) is provided on one side of the sampling support plate (11); a valve is provided on the pH regulating pipe (12); and a valve is provided on the water inlet elbow (4).

5. A sewage treatment system according to claim 1, characterized in that: The stirring device includes a hollow shaft (25), a rotary joint (26) and a chain transmission mechanism (27). An air inlet at one end of the hollow shaft (25) is connected to an air outlet of the rotary joint (26). The hollow shaft (25) is movably sealed and installed in the hydrolysis acidification tank body (20). A group of stirring blades (28) are provided on the hollow shaft (25). An air transmission channel connected to the inner cavity of the hollow shaft (25) is opened in the stirring blade (28). A group of hollow rods (29) are arranged in sequence on the blades of the stirring blade (28). An aeration nozzle is provided at one end of the hollow rod (29). The inner cavity of the hollow rod (29) is connected to the gas transmission channel of the stirring blade (28), and the shaft drive motor (31) drives the hollow shaft (25) to rotate through the chain transmission mechanism (27); a motor bracket is provided on the wall of the hydrolysis acidification tank body (20), the shaft drive motor (31) is installed on the motor bracket, the large sprocket of the chain transmission mechanism (27) is installed on the hollow shaft (25), and the small sprocket of the chain transmission mechanism (27) is installed on the power output shaft of the shaft drive motor (31); the air inlet of the rotary joint (26) is connected to the air outlet of the gas compressor through a pipeline.

6. A sewage treatment system according to claim 1, characterized in that: The water pump (22) has a water suction pipe extending vertically downward close to the inner bottom surface of the hydrolysis and acidification tank body (20), and the water outlet pipe of the sewage pump (22) is located above the sewage sedimentation tank (21); a U-shaped water pump bracket (32) is provided on the top of the hydrolysis and acidification tank body (20), and the sewage pump (22) is mounted on the U-shaped water pump bracket (32); and the sewage suction pipe (24) is connected to the inlet end of the sludge pump.

7. A sewage treatment system according to claim 1, characterized in that: The connection between the sludge concentration tank (23) and the bottom surface of the sewage sedimentation tank (21) is a slope surface (30).

8. A sewage treatment system according to claim 1, characterized in that: The filler barrel frame (51) includes a top plate (56), a bottom plate (57), a group of connecting rods (58) and an upper pressure plate (59), the top plate (56) is annular, a plurality of water-permeable holes are opened on the bottom plate (57), a group of connecting rods (58) are evenly distributed in an annular manner between the top plate (56) and the bottom plate (57), and the upper pressure plate (59) is installed on the top plate (56) by bolts; a guide rod (60) is provided in the filler barrel frame (51), a limit ring (61) is provided at the lower part of the guide rod (60), a shaft sleeve is provided in the middle part of the bottom plate (57), the bottom of the guide rod (60) is located in the shaft sleeve, the limit ring (61) is against the top of the shaft sleeve, a group of filler mounting discs (62) are arranged in sequence on the guide rod (60), and the biofilm filler is installed on the filler mounting disc (62). A guide hole is opened in the middle of the upper pressure plate (59), and the top of the guide rod (60) is located in the guide hole; the filler installation plate (62) is composed of an inner ring (63), an outer ring (64), a sleeve (65) and a group of connecting skeletons (66), a group of connecting skeletons (66) are evenly installed on the outer wall of the sleeve (65) with the sleeve (65) as the center, a group of filler installation grooves are evenly opened on the inner ring (63) and the outer ring (64), and the biofilm filler is installed in the filler installation grooves. The inner ring (63) and the outer ring (64) are installed on the group of connecting skeletons (66) from the inside to the outside, and the sleeve (65) is sleeved on the guide rod (60); fixed plates (67) are respectively provided at both ends of the top plate (56), and are detachably installed on the barrel body bracket (55) through the fixed plates (67).

9. A sewage treatment system according to claim 1, characterized in that: The aeration pipe (52) is installed in the oxidation tank body (50) through a grid support, and the air inlet of the aeration pipe (52) is connected to the air compressor output port through a pipe.

10. A sewage treatment system according to claim 1, characterized in that: A group of water outlets are provided on the water inlet pipe (53), and the water outlets are located at the lower part between two adjacent filling barrel racks (51); valves are respectively provided on the drainage outlet of the outlet channel (54), the sludge discharge outlet of the oxidation tank body (50), the aeration pipe (52) and the water inlet pipe (53).

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