Biochemical treatment system for aerobic granular sludge

Abstract

The utility model belongs to the field of sewage treatment, and particularly discloses an aerobic granular sludge biochemical treatment system which comprises a sewage pool, a pre-anoxic zone and a plurality of anaerobic zones, anoxic zones and aerobic zones are sequentially connected in series in the sewage pool along the flow direction of sewage, and a water distribution channel and a sludge channel are horizontally arranged above the aerobic zone at the tail end. A plurality of aerobic granular sludge bioreactors are respectively arranged on two sides of the water distribution channel; the water distribution channel is communicated with the aerobic granular sludge bioreactor through a water distribution pipe, and the aerobic granular sludge bioreactor is communicated to the aerobic zone and the pre-anoxic zone or the anaerobic zone through a corresponding sludge return pipe, a sludge channel and a sludge pipe; and a water collecting tank is horizontally arranged above the aerobic granular sludge bioreactor. According to the system, an aerobic granular sludge process is utilized, the equipment structure design is reasonable, granular sludge can be effectively screened, the energy consumption is low, the operation cost is effectively reduced, and the sewage treatment efficiency can be remarkably improved, so that higher sewage treatment requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sewage treatment, more particularly to an aerobic granular sludge biochemical treatment system. BACKGROUND

[0002] With the improvement of sewage discharge standard, sewage treatment process needs to be constantly improved, and the treatment efficiency needs to be further improved. The traditional sewage treatment adopts activated sludge method or its improved process water treatment facility, and carries out biological denitrification and phosphorus removal by adopting simultaneous nitrification and denitrification technology, which is low in efficiency.

[0003] The aerobic granular sludge (AGS) is the granular activated sludge formed by various microorganisms through self-condensation under the help of reasonable formation mechanism in aerobic environment. The AGS sewage treatment process can not only effectively treat municipal sewage, but also treat the mixed sewage of municipal sewage and industrial sewage, even including dairy wastewater and complex industrial wastewater containing ethylene glycol, dinitrophenol, o-cresol and phenol. Compared with the conventional activated sludge process, because of the existence of simultaneous nitrification and denitrification and short-cut nitrification and denitrification reaction in AGS, the use amount of carbon source can be obviously saved while ensuring high TN removal rate. However, the existing sewage equipment structure design using aerobic granular sludge process is not reasonable, the sewage treatment effect is not ideal, and the sewage treatment efficiency is low. UTILITARIAN CONTENT

[0004] In order to solve the deficiency of prior art, the utility model aims at providing an aerobic granular sludge biochemical treatment system, which utilizes the aerobic granular sludge process, has reasonable equipment structure design, can effectively screen granular sludge, is low in energy consumption, effectively reduces operation cost, can significantly improve sewage treatment efficiency, and meets higher sewage treatment requirement.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] An aerobic granular sludge biochemical treatment system, comprising a sewage pool, a pre-anoxic zone and a plurality of anaerobic zones, anoxic zones and aerobic zones arranged in series along the sewage flow direction in the sewage pool, a water distribution channel, a first sludge channel and a second sludge channel horizontally arranged above the last aerobic zone along the length direction thereof; a plurality of aerobic granular sludge biological reactors are arranged on both sides of the water distribution channel; the water distribution channel is connected with the aerobic granular sludge biological reactors through a water distribution pipe; the inside of the aerobic granular sludge biological reactors is connected with the first sludge channel through a sludge internal reflux pipe; the first sludge channel is connected with the front aerobic zone through a first sludge pipe; the bottom of the aerobic granular sludge biological reactors is connected with the second sludge channel through a sludge external reflux pipe; the second sludge channel is connected with the pre-anoxic zone or the anaerobic zone through a second sludge pipe; the sludge external reflux pipe and the sludge internal reflux pipe are both connected with a gas stripping aeration pipe; a water collecting tank is horizontally arranged above the aerobic granular sludge biological reactors; the water collecting tank is connected with a lower treatment unit through a water outlet pipe; a sludge discharge pipe is arranged in the middle of the aerobic granular sludge biological reactors.

[0007] Preferably, the aerobic granular sludge reactor comprises a plurality of reaction chambers arranged side by side, the upper parts of adjacent reaction chambers are directly connected, and the lower parts of adjacent reaction chambers are independently arranged; the water collecting tank is arranged above the reaction chambers along the length direction; the upper side walls of the reaction chambers are connected with the water distribution pipe, and the lower parts are connected with corresponding sludge internal reflux pipes and sludge external reflux pipes.

[0008] Preferably, the sludge internal reflux pipes and the sludge external reflux pipes extend into the inside of the reaction chambers and are oppositely arranged in the upper and lower parts.

[0009] Preferably, a plurality of water inlets connected with the water distribution pipe are arranged on the side walls of the reaction chambers, and flow guide plates are arranged in the reaction chambers in parallel with the inner side walls at intervals, and the flow guide plates are vertically arranged at positions opposite to the water inlets.

[0010] Preferably, the lower parts of adjacent two reaction chambers are connected through a communication pipe.

[0011] Preferably, the inner bottom parts of the reaction chambers and the communication pipe are provided with first aeration pipes.

[0012] Preferably, the upper parts of the reaction chambers are designed in a square shape, and the lower parts are independently designed in an inverted trapezoidal shape.

[0013] Preferably, the bottom part of the aerobic zone is paved with a second aeration pipe; the anaerobic zones and the anoxic zones are provided with flow pushers; and the pre-anoxic zone is provided with a stirrer.

[0014] Preferably, the water inlet ports and the water outlet ports of the pre-anoxic zone, the anaerobic zones, the anoxic zones and the aerobic zones are arranged at the most remote ends of the sewage flow direction and the opposite corners of the pool tank, respectively.

[0015] Preferably, the sludge discharge pipeline extends through the middle of the reaction bin and is horizontally arranged along the length direction of the reaction bin, and the end of the sludge discharge pipeline in the reaction bin is blocked, and a plurality of sludge inlets are arranged on the upper surface of the reaction bin at equal intervals.

[0016] The utility model has the beneficial effect that:

[0017] 1. The water distribution ditch of the utility model is connected with the aerobic granular sludge biological reactor through a plurality of water distribution pipes, realizes multi-point water inlet on the side, guarantees the uniformity of water distribution, and the sludge can enter the equipment through the water inlet on the side wall of the reaction bin through the water distribution pipe, generates and enriches the aerobic granular sludge through the self-agglomeration of a plurality of microorganisms, and the granular sludge of the equipment has good settling performance, high sludge-water separation efficiency, low energy consumption, can run automatically, and effectively reduces the operation cost.

[0018] 2. The utility model is provided with the flow guide plate that is parallel to the inner side wall and is arranged at intervals in the reaction bin, and the flow guide plate is vertically fixed at the position opposite to the water inlet, and after the sewage from the water distribution ditch enters the reaction bin through the water distribution pipe, the flow guide plate blocks the downward flow, so that the water flow distribution is more uniform.

[0019] 3. The utility model discloses that the bottom of two adjacent reaction bins is penetrated through through the connecting pipe, and the first aeration pipe is used to realize backwashing aeration, so that the sludge backflow is more thorough, and the sludge deposition anaerobic caused by the dead angle in the equipment is prevented.

[0020] 4. The water collecting tank is arranged above the two reaction bins along the length direction, and after the sewage is separated by the aerobic granular sludge biological reactor, the supernatant can enter the next treatment unit through the water collecting tank, so that the sewage treatment efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the sewage flow of the utility model;

[0022] Figure 2 It is a schematic diagram of the installation of the sludge pipe of the utility model;

[0023] Figure 3 It is a schematic diagram of the installation of the second aeration pipe of the utility model;

[0024] Figure 4 It is a side sectional view of the reaction bin, the water distribution ditch and the sludge channel of the utility model;

[0025] Figure 5 It is a schematic diagram of the installation of the connecting pipe of the utility model;

[0026] Figure 6 It is a schematic diagram of the opposite arrangement of the sludge inner backflow pipe and the sludge backflow pipe of the utility model;

[0027] Figure 7The utility model discloses a sludge discharge pipeline's plan view.

[0028] Fig. 11. pre-anoxic zone;12. multiple anaerobic zones;13. anoxic zone;14. aerobic zone;2. water distribution channel;21. water distribution pipe;3. sludge channel;31. first sludge channel;32. second sludge channel;4. reaction bin;41. water collecting tank;42. guide plate;51. first sludge pipe;52. second sludge pipe;53. sludge external reflux pipe;54. sludge internal reflux pipe;55. sludge discharge pipeline;551. sludge inlet;56. communication pipe;61. first aeration pipe;62. second aeration pipe;7. air-lift aeration pipeline;81. agitator;82. flow inducer. DETAILED DESCRIPTION

[0029] The principles and features of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not to limit the use range of the utility model.

[0030] As Figures 1-7 shown, the utility model provides an aerobic granular sludge biochemical treatment system, including sewage pool, and the pre-anoxic zone 11 and multiple anaerobic zones 12, anoxic zone 13, aerobic zone 14 are sequentially connected in series along the sewage flow direction in sewage pool. Specifically, four anoxic zones 13 are arranged horizontally in the embodiment, and one pre-anoxic zone 11 and two anaerobic zones 12 are arranged longitudinally on the left side of anoxic zone 13, and four aerobic zones 14 are arranged longitudinally on the right side of anoxic zone 13. Among them, the pre-anoxic zone 11, anaerobic zone 12, anoxic zone 13 and aerobic zone 14 are all square tanks, and the water inlet port and water outlet port of the pre-anoxic zone 11, anaerobic zone 12, anoxic zone 13 and aerobic zone 14 are respectively arranged at the opposite corners of the tank, that is, the farthest end of the sewage flow direction, so that the sewage presents a zigzag flow direction in the anoxic zone 13 and the aerobic zone 14. The bottom of the four aerobic zones 14 is paved with the second aeration pipe 62, and the second aeration pipe 62 is connected with the external aeration control system, which can automatically correct the actual aeration amount, so as to achieve the purpose of precise control of aeration. The anaerobic zone 12 and the anoxic zone 13 are provided with the flow inducer 82, which has the functions of flow induction, water flow creation and stirring. The pre-anoxic zone is provided with the agitator 81, which can fully stir the sludge.

[0031] The upper part of the last end aerobic zone 14 is horizontally transversely provided with a water distribution channel 2 and a sludge channel 3 along the length direction, the sludge channel 3 includes a first sludge channel 31 and a second sludge channel 32, the bottom surface of the water distribution channel 2 is lower than the water surface by a certain height, and the water inlet of the water distribution channel 2 is arranged at one side end thereof. The first sludge channel 31 and the second sludge channel 32 are installed side by side above the water distribution channel 2. The water distribution channel 2 is provided with a plurality of aerobic granular sludge biological reactors on both sides thereof. After the sewage enters the aerobic granular sludge biological reactor, the internal synchronous nitrification and denitrification and short-cut nitrification and denitrification reactions occur (more than 30% of the carbon source usage can be saved), the COD can be efficiently removed, and the nitrogen and phosphorus can be efficiently removed, the automatic operation can be realized, the electricity and labor cost can be saved, and the few-person or no-person management can be realized. The aerobic granular sludge biological reactor can realize high-load biological treatment (the sludge concentration is as high as 6000-8000 mg / L), the land use can be saved, and the engineering investment can be reduced under the condition of the same treatment scale.

[0032] The water distribution channel 2 is connected with the aerobic granular sludge biological reactor through a water distribution pipe 21 (the structure adopts a hose), the inside of the aerobic granular sludge biological reactor is connected with the first sludge channel 31 through a sludge internal reflux pipe 54, and the first sludge channel 31 is connected with the front end aerobic zone 14 through a first sludge pipe 51; the bottom of the aerobic granular sludge biological reactor is connected with the second sludge channel 32 through a sludge external reflux pipe 53, and the second sludge channel 32 is connected with the pre-anoxic zone 11 or the anaerobic zone 12 through a second sludge pipe 52. The sludge internal reflux pipe 54 and the sludge external reflux pipe 53 are both connected with a gas lifting aeration pipeline 7, under the action of the gas lifting aeration pipeline 7, the sludge in the aerobic granular sludge biological reactor can be lifted to the corresponding sludge channel through the corresponding reflux pipeline. The middle part of the aerobic granular sludge biological reactor is connected with a sludge discharge pipeline 55, and the sludge discharge pipeline 55 is connected with a sludge pump station.

[0033] Specifically, each aerobic granular sludge biological reactor includes a plurality of horizontally and side-by-side arranged reaction bins 4, and the top opening height of the reaction bin 4 is higher than the water surface of the last end aerobic zone 14. The upper parts of the adjacent two reaction bins 4 are directly connected, and the lower parts are independently arranged. In the embodiment, the reaction bin 4 is side-by-side arranged with two, the upper part of the reaction bin 4 is designed in a square shape, and the lower part is independently designed in an inverted trapezoidal shape. The upper side walls of the two reaction bins 4 are provided with a plurality of water inlets, and the water inlets are connected with the water distribution channel 2 through corresponding water distribution pipes 21. The water distribution channel 2 of the application is connected with the aerobic granular sludge biological reactor through a plurality of water distribution pipes 21, realizes side multi-point water inlet, not only ensures the uniformity of water distribution, but also enables the sludge to enter the equipment through the water inlets of the reaction bin 4 side wall through the water distribution pipe 21, generates and enriches the aerobic granular sludge through the self-agglomeration of various microorganisms, and the granular sludge has good settling performance, high sludge-water separation efficiency and low energy consumption, can run automatically, and effectively reduces the operation cost.

[0034] The sludge discharge pipeline 55 penetrates into the middle of the reaction bin 4 and is horizontally arranged along the length direction of the two reaction bins 4. The end of the sludge discharge pipeline 55 in the reaction bin 4 is blocked, and a plurality of sludge inlets 551 are evenly arranged on the upper surface thereof. The sludge with poor flocculation effect can enter the sludge discharge pipeline 55 through the sludge inlets 551 and then be discharged to the sludge pump station by the sludge discharge pipeline 55.

[0035] As shown in Figure 4 , the lower part of each of the two reaction bins 4 is connected with a corresponding sludge internal reflux pipe 54 and a sludge external reflux pipe 53. In the embodiment, the sludge internal reflux pipe 54 and the sludge external reflux pipe 53 are horizontally arranged on the same side and arranged in parallel. Figure 6 In addition, as shown in , another embodiment of the present application can be that the sludge internal reflux pipe 54 and the sludge external reflux pipe 53 are arranged in the corresponding reaction bin 4 and the end openings thereof are arranged in an opposite direction.

[0036] In addition, the present application is provided with a flow guide plate 42 arranged in parallel with the inner side wall of the reaction bin 4. The flow guide plate 42 is vertically arranged at a position opposite to the water inlet. After the sewage from the distribution channel 2 enters the reaction bin 4 through the distribution pipe 21, the flow guide plate 42 can block the downward flow of the sewage, so that the water flow is more uniform.

[0037] The water collecting tank 41 is horizontally arranged above the two reaction bins 4 along the length direction. The water inlet of the water collecting tank 41 is lower than the water surface by a certain height. After the sewage is separated from the sludge in the aerobic granular sludge biological reactor, the supernatant can enter the next treatment unit through the water collecting tank 41, so as to further improve the sewage treatment efficiency.

[0038] The lower part of the adjacent two reaction bins 4 is connected by a communication pipe 56, and the inner bottom of the reaction bin 4 and the communication pipe 56 is provided with a first aeration pipe 61. The present application penetrates the bottom of the adjacent two reaction bins 4 through the communication pipe 56 and realizes backwashing aeration by the first aeration pipe 61, so as to make the sludge reflux more thorough and prevent the sludge from depositing anaerobically due to the dead angle in the equipment. In the specific implementation, the first aeration pipe 61 and the air-lift aeration pipeline 7 can be simultaneously connected to the same fan main pipeline, so that the fan main pipeline can simultaneously provide the air source for the first aeration pipe 61 and the air-lift aeration pipeline 7, thereby significantly improving the resource utilization rate and being more energy-saving and environment-friendly.

[0039] The specific working process of the utility model is: after sewage passes through pre-anoxic zone 11, anaerobic zone 12, anoxic zone 13 and aerobic zone 14, then enters into water distribution canal 2, after water distribution of water distribution canal 2, enters into aerobic granular sludge biological reactor through water distribution pipe 21, after sludge and water separation in aerobic granular sludge biological reactor, supernatant enters into next unit through water collecting tank 41, bottom activated sludge returns to pre-anoxic zone 11 or anaerobic zone 12 through second sludge pipe 52, backflow sludge returns to front section of aerobic zone 14 through first sludge pipe 51, middle sludge with poor flocculation effect can be discharged outward through sludge discharge pipeline 55, and then the function of the whole sewage treatment system is completed.

[0040] Obviously, the above-described embodiments are only some of the embodiments of the present application, not all the embodiments, and the drawings show the preferred embodiments of the present application, but do not limit the patent scope of the present application. The present application can be implemented in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the specification and drawings, directly or indirectly applied to other related technical fields, is also within the scope of the patent protection of the present application.

Claims

1. An aerobic granular sludge biochemical treatment system comprising a sewage tank, characterized in that: The sewage tank is provided with a pre-anoxic zone and a plurality of anaerobic zones, anoxic zones and aerobic zones in sequence along the sewage flow direction; a water distribution channel, a first sludge channel and a second sludge channel are horizontally arranged above the last aerobic zone along the length direction thereof; a plurality of aerobic granular sludge bioreactors are arranged on both sides of the water distribution channel; the water distribution channel is connected with the aerobic granular sludge bioreactors through a water distribution pipe; the inside of the aerobic granular sludge bioreactor is connected with the first sludge channel through a sludge internal reflux pipe; the first sludge channel is connected with the front aerobic zone through a first sludge pipe; the bottom of the aerobic granular sludge bioreactor is connected with the second sludge channel through a sludge external reflux pipe; the second sludge channel is connected with the pre-anoxic zone or the anaerobic zone through a second sludge pipe; the sludge internal reflux pipe and the sludge external reflux pipe are both connected with a gas stripping and aeration pipe; a water collecting tank is horizontally arranged above the aerobic granular sludge bioreactor; the water collecting tank is connected with a lower treatment unit through a water outlet pipe; a sludge discharge pipe is arranged in the middle of the aerobic granular sludge bioreactor.

2. The aerobic granular sludge bio-chemical treatment system according to claim 1, characterized in that: The aerobic granular sludge bioreactor comprises a plurality of reaction chambers arranged side by side; the upper parts of adjacent reaction chambers are directly connected, and the lower parts are independently arranged; the water collecting tank is arranged above the reaction chambers along the length direction; the upper side wall of the reaction chamber is connected with the water distribution pipe, and the lower part is connected with the corresponding sludge internal reflux pipe and sludge external reflux pipe.

3. The aerobic granular sludge bio-chemical treatment system according to claim 2, characterized in that: The sludge internal reflux pipe and the sludge external reflux pipe extend into the reaction chamber and are oppositely arranged in the opening.

4. The aerobic granular sludge bio-chemical treatment system according to claim 2, characterized in that: A plurality of water inlets are arranged on the side wall of the reaction chamber and connected with the water distribution pipe; a guide plate is arranged in the reaction chamber and parallel to the inner side wall; the guide plate is vertically arranged at a position opposite to the water inlet.

5. The aerobic granular sludge bio-chemical treatment system according to claim 2, characterized in that: The lower parts of adjacent two reaction chambers are connected through a communication pipe.

6. The aerobic granular sludge bio-chemical treatment system according to claim 5, characterized in that: The inner bottom of the reaction chamber and the communication pipe is provided with a first aeration pipe.

7. The aerobic granular sludge bio-chemical treatment system according to claim 2, characterized in that: The upper part of the reaction chamber is designed in a square shape, and the lower part is designed in an independent inverted trapezoidal shape.

8. The aerobic granular sludge bio-chemical treatment system according to claim 1, characterized in that: A second aeration pipe is arranged at the bottom of the aerobic zone; a pusher is arranged in the anaerobic zone and the anoxic zone; and a stirrer is arranged in the pre-anoxic zone.

9. The aerobic granular sludge bio-chemical treatment system according to claim 1, characterized in that: The water inlet and the water outlet of the pre-anoxic zone, the anaerobic zone, the anoxic zone and the aerobic zone are arranged at the diagonal positions of the pool tank farthest from the sewage flow direction.

10. The aerobic granular sludge bio-chemical treatment system according to claim 2, characterized in that: The sludge discharge pipe extends into the middle of the reaction chamber and is horizontally arranged along the length direction of the reaction chamber; the end of the sludge discharge pipe in the reaction chamber is blocked, and a plurality of sludge inlets are arranged on the upper surface of the sludge discharge pipe at equal intervals.

Images