Integrated a / o variable reaction sewage treatment equipment

Abstract

The utility model discloses an integration A / O variable reaction sewage treatment equipment, it includes the reaction pool, and the reaction pool is separated into the oxygen -deficient area, the aerobic zone, the variable reaction area and the sedimentation area in proper order through the baffle, and the one side of oxygen -deficient area bottom is provided with the water inlet, and the one side of sedimentation area top is provided with the water outlet, and the top of oxygen -deficient area is communicated with the top of aerobic zone, and the bottom of aerobic zone is communicated with the bottom of variable reaction area, and the top and bottom of variable reaction area are communicated with the top and bottom of sedimentation area respectively, and variable reaction area is provided with T type branch pipe, and the both sides pipe orifices of T type branch pipe are located in the bottom of variable reaction area and sedimentation area respectively, and T type branch pipe is connected with the bottom of oxygen -deficient area through reflux pump, and the sewage is filled oxygen and carries out nitrification reaction through the aeration pipe of aerobic zone, and then is refluxed to the oxygen -deficient area of front end through reflux pump in the bottom of variable reaction area and carries out normal denitrification, and the bottom of variable reaction area is communicated with the bottom of sedimentation area simultaneously, and the reflux of sludge is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely relates to a kind of integrated A / O variable reaction sewage treatment equipment. BACKGROUND

[0002] In conventional A / O (anoxic / aerobic) process, anoxic tank, aerobic tank and sedimentation tank need to be designed, and the equipment includes anoxic tank mixer, aerobic tank aeration system, mixed liquor return pump, sludge return pump and sludge pump, which leads to complex system and high energy consumption. In addition, due to the overall anoxic state of sludge during the settling process in the sedimentation tank, denitrification often occurs, which causes air bubbles to be mixed in the sludge, and further leads to poor sludge settling property, affecting the water quality of effluent. SUMMARY

[0003] In view of the above deficiencies of the prior art, the utility model provides an integrated A / O variable reaction sewage treatment equipment, which solves the technical problems mentioned in the background.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: Provided is an integrated A / O variable reaction sewage treatment equipment, which includes a reaction tank. The reaction tank is divided into an anoxic zone, an aerobic zone, a variable reaction zone and a sedimentation zone in sequence by partitions. A water inlet is arranged on one side of the bottom of the anoxic zone, and a water outlet is arranged on one side of the top of the sedimentation zone. The top of the anoxic zone is in communication with the top of the aerobic zone, the bottom of the aerobic zone is in communication with the bottom of the variable reaction zone, and the top and bottom of the variable reaction zone are in communication with the top and bottom of the sedimentation zone, respectively. The variable reaction zone is provided with a T-shaped branch pipe, and the two side openings of the T-shaped branch pipe are located at the bottom of the variable reaction zone and the sedimentation zone, respectively. The T-shaped branch pipe is connected to the bottom of the anoxic zone through a return pump.

[0005] Further, the partitions include a first partition, a second partition and a third partition. The first partition separates the anoxic zone and the aerobic zone, and the top of the first partition is 0.1-0.2 m lower than the design water level. The second partition separates the aerobic zone and the variable reaction zone, and the distance between the bottom of the second partition and the bottom of the reaction tank is 0.3-0.5 m. The top of the second partition is higher than the design water level. The third partition separates the variable reaction zone and the sedimentation zone, and it is divided into an upper straight plate section and a lower inclined plate section. The top of the third partition is 0.15-0.25 m lower than the design water level, and the inclination angle of the lower inclined plate section is 60-70°. The distance between the bottom of the lower inclined plate section and the side wall of the reaction tank is 0.2-0.5 m.

[0006] Further, a fourth partition is arranged between the water outlet and the third partition, and the distance between the fourth partition and the side wall of the reaction tank is 0.1-0.2 m. The bottom of the fourth partition is 0.3-0.5 m higher than the bottom of the upper straight plate section.

[0007] Further, the main pipe of the T-shaped branch pipe is provided with a sludge discharge branch pipe, and the sludge discharge branch pipe is provided with an electric valve.

[0008] Further, the anoxic zone is provided with a first agitator, and the variable reaction zone is provided with a second agitator.

[0009] Further, the bottom of the aerobic zone is provided with an aeration pipe.

[0010] The utility model discloses the beneficial effects are: 1. The scheme increases the variable reaction zone after the aerobic zone, and the bottom is the aerobic area, and gradually transitions to the anoxic area in the middle and upper parts, and the microorganism further completes denitrification in the anoxic area, and the gas generated by denitrification rises with the mixed liquid, and separates with the release to the water surface with stirring, so that the settling effect of the sludge in the sedimentation zone can be improved.

[0011] 2. The mixed liquid of the variable reaction zone enters the sedimentation zone to separate the sludge and water, and the sludge sinks to the bottom of the sedimentation zone, and the bottom of the sedimentation zone is communicated with the bottom of the variable reaction zone, and the settled sludge rises with the sewage in the bottom of the variable reaction zone, to form a local sludge internal circulation, so that the purification effect of the variable reaction zone is strengthened.

[0012] 3. The two side pipe mouths of the T-shaped branch pipe of the scheme are located at the bottoms of the variable reaction zone and the sedimentation zone respectively, the sewage is subjected to nitrification reaction after being oxygenated by the aeration pipe of the aerobic zone, and is returned to the anoxic zone at the front end by the reflux pump in the bottom of the variable reaction zone to perform conventional denitrification, and the bottom of the variable reaction zone is communicated with the bottom of the sedimentation zone, to realize sludge reflux, so that the double circulation mode of the mixed liquid reflux circulation of the aerobic zone-anoxic zone and the sludge reflux circulation of the sedimentation zone-anoxic zone is realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the integrated A / O variable reaction sewage treatment equipment.

[0014] Among them, 1, reaction tank, 2, anoxic zone, 3, aerobic zone, 4, variable reaction zone, 5, sedimentation zone, 6, water inlet, 7, water outlet, 8, T-shaped branch pipe, 9, reflux pump, 10, first baffle, 11, second baffle, 12, third baffle, 13, upper straight plate section, 14, lower inclined plate section, 15, fourth baffle, 16, sludge discharge branch pipe, 17, electric valve, 18, first agitator, 19, second agitator, 20, aeration pipe. DETAILED DESCRIPTION

[0015] The specific embodiments of the utility model are described below to make the technical personnel in the art understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific embodiments, and for the ordinary technical personnel in the art, as long as the various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, and all the utility model creations using the utility model concept are within the scope of protection.

[0016] As Figure 1 shown, the integrated A / O variable reaction wastewater treatment equipment includes a reaction tank 1, the reaction tank 1 is sequentially separated into an anoxic zone 2, an aerobic zone 3, a variable reaction zone 4 and a sedimentation zone 5 by partitions, one side of the bottom of the anoxic zone 2 is provided with a water inlet 6, one side of the top of the sedimentation zone 5 is provided with a water outlet 7; the anoxic zone 2 is provided with a first stirrer 18, the variable reaction zone 4 is provided with a second stirrer 19, the bottom of the aerobic zone 3 is provided with an aeration pipe 20; the top of the anoxic zone 2 is communicated with the top of the aerobic zone 3, the bottom of the aerobic zone 3 is communicated with the bottom of the variable reaction zone 4, and the top and bottom of the variable reaction zone 4 are respectively communicated with the top and bottom of the sedimentation zone 5.

[0017] In specific implementation, the partitions include a first partition 10, a second partition 11, a third partition 12 and a fourth partition 15; the first partition 10 separates the anoxic zone 2 and the aerobic zone 3, the top of the first partition 10 is 0.1-0.2m (H1) lower than the design water level; the second partition 11 separates the aerobic zone 3 and the variable reaction zone 4, the distance between the bottom of the second partition 11 and the bottom of the reaction tank 1 is 0.3-0.5m (H2), and the top of the second partition 11 is higher than the design water level; the third partition 12 separates the variable reaction zone 4 and the sedimentation zone 5, and is divided into an upper straight plate section 13 and a lower inclined plate section 14, the top of the third partition 12 is 0.15-0.25m (H3) lower than the design water level, the inclination angle of the lower inclined plate section 14 is 60-70°, and the distance between the bottom of the lower inclined plate section 14 and the side wall of the reaction tank 1 is 0.2-0.5m (L2); the fourth partition 15 is arranged between the water outlet 7 and the third partition 12, the distance between the fourth partition 15 and the side wall of the reaction tank 1 is 0.1-0.2m (L1), the water inlet depth (H4) of the fourth partition 15 can be determined according to the hydraulic retention time and the flow rate of the separation section, the top of the fourth partition 15 is higher than the design water level, the bottom of the fourth partition 15 is 0.3-0.5m higher than the bottom of the upper straight plate section 13, and the top of the upper straight plate section 13 is 0.3-0.5m (H5) higher than the height difference between the bottom of the fourth partition 15.

[0018] The variable reaction zone 4 is provided with a T-shaped branch pipe 8, and the two side pipe openings of the T-shaped branch pipe 8 are located at the bottoms of the variable reaction zone 4 and the sedimentation zone 5 respectively, and the T-shaped branch pipe 8 is connected with the bottom of the anoxic zone 2 through a reflux pump 9; a sludge discharge branch pipe 16 is arranged on the main pipe of the T-shaped branch pipe 8, and an electric valve 17 is arranged on the sludge discharge branch pipe 16.

[0019] The present scheme increases the variable reaction zone 4 after the aerobic zone 3, the bottom of which is the aerobic zone 3 domain, and gradually transitions to the anoxic zone 2 domain in the middle and upper part. The microorganisms further complete denitrification in the anoxic zone 2 domain, and the gas produced by denitrification rises with the mixed liquid, is released and separated from the water surface with stirring, thereby improving the settling effect of the sludge in the sedimentation zone 5. Then the mixed liquid in the variable reaction zone 4 enters the sedimentation zone 5 for sludge-water separation, and the sludge sinks to the bottom of the sedimentation zone 5, which is communicated with the bottom of the variable reaction zone 4. The settled sludge rises with the sewage at the bottom of the variable reaction zone 4, forming a local sludge internal circulation, thereby strengthening the purification effect of the variable reaction zone 4. The two side openings of the T-shaped branch pipe 8 are located at the bottom of the variable reaction zone 4 and the sedimentation zone 5, respectively. After the sewage is oxygenated and nitrified by the aeration pipe 20 in the aerobic zone 3, it is returned to the front end of the anoxic zone 2 by the return pump 9 at the bottom of the variable reaction zone 4 for conventional denitrification. At the same time, the bottom of the variable reaction zone 4 is communicated with the bottom of the sedimentation zone 5, realizing sludge return, thereby realizing the double circulation mode of mixed liquid return circulation in the aerobic zone 3-anoxic zone 2 and sludge return circulation in the sedimentation zone 5-anoxic zone 2.

[0020] The operation process of the present scheme will be described in detail as follows: The sewage enters the anoxic zone 2 and the aerobic zone 3 through the water inlet 6, and performs conventional denitrification and nitrification to remove total nitrogen, ammonia nitrogen and organic matter. The sewage enters the variable reaction zone 4 from the bottom of the aerobic zone 3. Since the ammonia nitrogen nitrification and organic matter degradation are basically completed at the end of the aerobic zone 3, the sewage itself often has a high dissolved oxygen, and the bottom of the variable reaction zone 4 is in an aerobic state. As the mixed liquid rises, the mixed liquid gradually tends to be in an anoxic state and further denitrifies. The sewage and sludge are separated in the sedimentation zone 5, and the sludge enters the bottom after separation, and the clear water is discharged through the water outlet 7. The T-shaped branch pipe 8 collects the mixed liquid at the bottom of the variable reaction zone 4 and the sludge at the bottom of the sedimentation zone 5, and returns them to the front end of the anoxic zone 2 for denitrification and sludge supplement. According to the sludge concentration, the electric valve 17 is set to open at a certain time to discharge the remaining sludge.

Claims

1. An integrated A / O variable reaction wastewater treatment device, characterized in that, The system includes a reaction tank, which is sequentially divided into an anoxic zone, an aerobic zone, a variable reaction zone, and a sedimentation zone by a partition. An inlet is provided on one side of the bottom of the anoxic zone, and an outlet is provided on one side of the top of the sedimentation zone. The top of the anoxic zone is connected to the top of the aerobic zone, and the bottom of the aerobic zone is connected to the bottom of the variable reaction zone. The top and bottom of the variable reaction zone are respectively connected to the top and bottom of the sedimentation zone. The variable reaction zone is provided with a T-shaped branch pipe, and the two ends of the T-shaped branch pipe are located at the bottom of the variable reaction zone and the sedimentation zone, respectively. The T-shaped branch pipe is connected to the bottom of the anoxic zone through a reflux pump.

2. The integrated A / O variable reaction wastewater treatment equipment according to claim 1, characterized in that, The partition includes a first partition, a second partition, and a third partition; The first baffle separates the anoxic zone and the aerobic zone, and the top of the first baffle is 0.1-0.2m below the design water level; The second baffle separates the aerobic zone and the variable reaction zone. The bottom of the second baffle is 0.3-0.5m away from the bottom of the reaction tank, and the top of the second baffle is higher than the design water level. The third baffle separates the reaction zone and the sedimentation zone. It is divided into an upper straight plate section and a lower inclined plate section. The top of the third baffle is 0.15-0.25m below the design water level. The inclination angle of the lower inclined plate section is 60-70°, and the bottom of the lower inclined plate section is 0.2-0.5m away from the side wall of the reaction tank.

3. The integrated A / O variable reaction wastewater treatment equipment according to claim 2, characterized in that, A fourth baffle is provided between the outlet and the third baffle. The distance between the fourth baffle and the side wall of the reaction tank is 0.1-0.2m. The bottom of the fourth baffle is 0.3-0.5m higher than the bottom of the upper straight plate section.

4. The integrated A / O variable reaction wastewater treatment equipment according to claim 1, characterized in that, The main pipeline of the T-shaped branch pipe is equipped with a sludge discharge branch pipe, and an electric valve is installed on the sludge discharge branch pipe.

5. The integrated A / O variable reaction wastewater treatment equipment according to claim 1, characterized in that, The anoxic zone is equipped with a first mixer, and the variable reaction zone is equipped with a second mixer.

6. The integrated A / O variable reaction wastewater treatment equipment according to claim 1, characterized in that, An aeration pipe is installed at the bottom of the aerobic zone.

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