Intensive biological sewage treatment system

Abstract

The utility model discloses an intensive biological sewage treatment system, and belongs to the technical field of sewage treatment.The intensive biological sewage treatment system comprises a water distribution channel, a water distribution system, one or more biological pool units, a mud distribution system and an internal reflux system.The biological pool unit comprises a first area and a second area which are arranged side by side along the water distribution channel; a plurality of functional pools are integrated in the biological pool unit and comprise a pre-anoxic pool, an anaerobic pool, a first anoxic pool, a second anoxic pool and a third anoxic pool which are arranged in the first region, and a first aerobic pool, a fourth anoxic pool and a second aerobic pool which are arranged in the second region. According to the intensive biological sewage treatment system, an intensive structural layout is adopted, a plurality of functional treatment units are highly integrated, high efficiency of sewage treatment is ensured, meanwhile, the layout is compact, on the premise that land resources are limited, the occupied area is greatly saved, and the capital construction cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to an intensive sewage biological treatment system. BACKGROUND

[0002] During the construction and reconstruction process, sewage treatment plants have exposed many problems. Large-scale sewage treatment plants have large land occupation, and during the urbanization process, land resources are scarce. The newly-built sewage treatment plants face the problems of high land acquisition cost and difficult site selection. On the other hand, a large number of built sewage treatment plants are difficult to meet the growing demand for sewage purification due to the limitation of early design, outdated treatment process and low efficiency, and need to be upgraded. However, the reconstruction is also limited by the site, and it is difficult to add large-scale treatment equipment to improve the efficiency. CONTENT OF THE UTILITY MODEL

[0003] The present application provides an intensive sewage biological treatment system, aiming to solve the problems of large land occupation and high capital cost of the sewage treatment system in the prior art.

[0004] An intensive sewage biological treatment system, comprising a water distribution channel, a water distribution system, one or more biological pool units, a sludge distribution system and an internal reflux system;

[0005] The biological pool unit comprises a first region and a second region arranged side by side along the water distribution channel, and a plurality of functional pools are integrated in the biological pool unit, wherein the plurality of functional pools comprise a pre-anoxic pool, an anaerobic pool, a first anoxic pool, a second anoxic pool and a third anoxic pool arranged in the first region, and a first aerobic pool, a fourth anoxic pool and a second aerobic pool arranged in the second region;

[0006] The pre-anoxic pool, the anaerobic pool, the first anoxic pool, the second aerobic pool and the fourth anoxic pool are arranged in sequence along the water distribution channel, and the water distribution channel is directly communicated with the water inlet end of the pre-anoxic pool, the anaerobic pool, the first anoxic pool and the fourth anoxic pool; the pre-anoxic pool, the anaerobic pool, the second anoxic pool, the third anoxic pool, the first aerobic pool, the fourth anoxic pool and the second aerobic pool are connected in sequence, the water inlet end of the first anoxic pool is connected with the water distribution channel, the water outlet end of the first anoxic pool is connected with the second anoxic pool, and the water outlet end of the second aerobic pool is connected with a drain pipe;

[0007] The water outlet end of the water distribution system is connected with the water distribution channel, and the water distribution system provides sewage to be treated to the biological pool unit through the water distribution channel; the sludge distribution system is connected with the biological pool unit, and is used for providing reflux sludge to the biological pool unit.

[0008] Optionally, the intensive biological wastewater treatment system includes two biological tank units, namely a first tank and a second tank, which are arranged side by side along the direction of the water distribution channel and are structurally symmetrical.

[0009] Optionally, the intensive biological wastewater treatment system includes four biological tank units, namely tank one, tank two, tank three and tank four; there are two water distribution channels, namely a first water distribution channel and a second water distribution channel, which are arranged in parallel.

[0010] The first pool and the second pool are arranged side by side along the first water distribution channel. The first section of the first water distribution channel corresponds to the position of the first pool, and the second section of the first water distribution channel corresponds to the position of the second pool. The first pool and the second pool have symmetrical structures.

[0011] The third and fourth pools are arranged side by side along the second water distribution channel. The first section of the second water distribution channel corresponds to the position of the third pool, and the second section of the second water distribution channel corresponds to the position of the fourth pool. The third and fourth pools are symmetrical in structure, and the third and fourth pools are arranged symmetrically with the first and second pools.

[0012] Optionally, the water distribution system is located near the first water distribution channel, between the first pool and the second pool; the sludge distribution system is located near the second water distribution channel, between the third pool and the fourth pool; the water distribution system and the sludge distribution system are arranged symmetrically.

[0013] Optionally, the water distribution system includes a main water inlet pipe, a first water distribution unit, and a second water distribution unit;

[0014] The first water distribution unit and the second water distribution unit are connected to the outlet end of the main water inlet pipe. The first water distribution unit is located on one side of the first pool, and the second water distribution unit is located on one side of the second pool. The first water distribution unit and the second water distribution unit are arranged symmetrically.

[0015] The outlet of the first water distribution unit is connected to the first pool and the third pool respectively, and supplies sewage to the first pool and the third pool respectively; the outlet of the second water distribution unit is connected to the second pool and the fourth pool respectively, and supplies sewage to the second pool and the fourth pool respectively.

[0016] Optionally, the first water distribution unit includes a first pool inlet weir, a third pool inlet weir, a first pool inlet trough, a third pool inlet trough, and a third pool inlet pipe; the first pool inlet trough is located below the first pool inlet weir and is directly connected to the first section of the first water distribution channel; the third pool inlet trough is located below the third pool inlet weir and is connected to the first section of the second water distribution channel through the third pool inlet pipe.

[0017] The second water distribution unit includes a second pool inlet weir, a fourth pool inlet weir, a second pool inlet trough, a fourth pool inlet trough, and a fourth pool inlet pipe; the second pool inlet trough is located below the second pool inlet weir and is directly connected to the second section of the first water distribution channel; the fourth pool inlet trough is located below the fourth pool inlet weir and is connected to the second section of the second inlet channel through the fourth pool inlet pipe.

[0018] Optionally, both the inlet weirs of the three pools and the inlet weirs of the four pools are equipped with weir gates.

[0019] Optionally, the liquid level of the three-pool inlet tank is lower than the bottom elevation of the first-pool inlet tank, and the liquid level of the fourth-pool inlet tank is lower than the bottom elevation of the second-pool inlet tank.

[0020] Optionally, the mud mixing system includes a main mud inlet pipe, a mud mixing chamber, a first mud mixing unit, and a second mud mixing unit; the mud mixing chamber is located at the mud outlet end of the main mud inlet pipe, the first mud mixing unit and the second mud mixing unit are respectively connected to both sides of the mud mixing chamber, the first mud mixing unit is located on one side of the three pools, the second mud mixing unit is located on one side of the four pools, and the first mud mixing unit and the second mud mixing unit are arranged symmetrically.

[0021] The sludge outlet of the first sludge mixing unit is connected to the first pool and the third pool respectively, and provides return sludge to the first pool and the third pool respectively; the sludge outlet of the second sludge mixing unit is connected to the second pool and the fourth pool respectively, and provides return sludge to the second pool and the fourth pool respectively.

[0022] Optionally, the first sludge preparation unit includes a first sludge preparation hole, a third sludge preparation hole, a first sludge inlet trough, a third sludge inlet trough, and a sludge inlet pipe for a first pool; the first sludge preparation hole and the third sludge preparation hole are located on one side of the sludge preparation chamber and are respectively connected to the first sludge inlet trough and the third sludge inlet trough; the first sludge inlet trough is connected to the pre-anoxic pool of the first pool through the sludge inlet pipe for a first pool, and the third sludge inlet trough is directly connected to the pre-anoxic pool of the third pool;

[0023] The second sludge mixing unit includes a second sludge mixing hole, a fourth sludge mixing hole, a second sludge inlet trough, a fourth sludge inlet trough, and a second sludge inlet pipe; the second sludge mixing hole and the fourth sludge mixing hole are located on the other side of the sludge mixing chamber and are respectively connected to the second sludge inlet trough and the fourth sludge inlet trough; the second sludge inlet trough is connected to the pre-anoxic tank of the second sludge tank through the second sludge inlet pipe, and the fourth sludge inlet trough is directly connected to the pre-anoxic tank of the fourth sludge tank.

[0024] Optionally, the liquid level in the first sludge inlet is lower than the bottom elevation of the third sludge inlet, and the liquid level in the second sludge inlet is lower than the bottom elevation of the fourth sludge inlet.

[0025] Optionally, the water distribution channel is provided with a first water passage hole, a second water passage hole, a third water passage hole and a fourth water passage hole respectively at the water inlet end of the pre-anoxic pool, the anaerobic pool, the first anoxic pool and the fourth anoxic pool.

[0026] Optionally, the ratio of the influent flow rates of the pre-anoxic tank, the anaerobic tank, and the first anoxic tank is 20%Q:40%Q:40%Q, where Q represents the total influent flow rate of a biological tank unit.

[0027] Optionally, the volume ratio of the multiple functional pools satisfies:

[0028] Pre-anoxic tank: Anaerobic tank: (First anoxic tank + Second anoxic tank + Third anoxic tank): First aerobic tank: Fourth anoxic tank: Second aerobic tank = 3.3%V: 13.3% V: 35% V: 36.6% V: 8.3% V: 3.3%V, where V represents the total volume of a biological tank unit.

[0029] Optionally, the inlet end of the internal reflux system is connected to the first aerobic tank, and the outlet end of the internal reflux system is connected to the first anoxic tank, for transporting the nitrified liquid in the first aerobic tank to the first anoxic tank.

[0030] Beneficial effects:

[0031] The intensive biological wastewater treatment system described in this application includes a water distribution channel, a water distribution system, one or more biological tank units, a sludge preparation system, and an internal recirculation system. The biological tank unit comprises a first region and a second region arranged side-by-side along the water distribution channel. Each biological tank unit integrates multiple functional tanks, including a pre-anoxic tank, an anaerobic tank, a first anoxic tank, a second anoxic tank, and a third anoxic tank located in the first region, and a first aerobic tank, a fourth anoxic tank, and a second aerobic tank located in the second region. An oxygenation tank, a pre-anoxic tank, an anaerobic tank, a first anoxic tank, a second aerobic tank, and a fourth anoxic tank are arranged sequentially along the water distribution channel, which is directly connected to the inlet ends of the pre-anoxic tank, anaerobic tank, first anoxic tank, and fourth anoxic tank. The pre-anoxic tank, anaerobic tank, second anoxic tank, third anoxic tank, first aerobic tank, fourth anoxic tank, and second aerobic tank are connected in series. The inlet end of the first anoxic tank is connected to the water distribution channel, the outlet end of the first anoxic tank is connected to the second anoxic tank, and the outlet end of the second aerobic tank is connected to a drain pipe. This application, by integrating multiple functional tanks and rationally arranging them, can achieve multi-stage wastewater treatment with different functions, effectively removing various pollutants such as organic matter, ammonia nitrogen, total nitrogen, and total phosphorus from wastewater, thereby ensuring the efficiency of wastewater treatment. At the same time, the overall layout is compact, greatly reducing land occupation under limited land resources and helping to reduce infrastructure costs. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the planar structure of the intensive biological wastewater treatment system proposed in Embodiment 1 of this application;

[0034] Figure 2 This is a schematic diagram of the planar structure of the intensive biological wastewater treatment system proposed in Embodiment 2 of this application;

[0035] Figure 3 This is a schematic diagram of the planar structure of the water distribution system and sludge distribution system in the intensive biological wastewater treatment system proposed in Embodiment 2 of this application;

[0036] Figure 4 This is a schematic diagram of the planar structure of the intensive biological wastewater treatment system proposed in Embodiment 3 of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Water distribution system; 101. Main inlet pipe; 102. Inlet weir of pool 1; 103. Inlet weir of pool 3; 104. Inlet trough of pool 1; 105. Inlet trough of pool 3; 106. Inlet pipe of pool 3; 107. Inlet weir of pool 2; 108. Inlet weir of pool 4; 109. Inlet trough of pool 2; 110. Inlet trough of pool 4; 111. Inlet pipe of pool 4;

[0039] 2. Water distribution channel; 201. First water passage hole; 202. Second water passage hole; 203. Third water passage hole; 204. Fourth water passage hole; 21. First water distribution channel; 22. Second water distribution channel;

[0040] 3. A1 pre-anoxic tank; 4. A1 anaerobic tank; 5. A2 anaerobic tank; 6. A2 anoxic tank;

[0041] 7. A3 anoxic pool 7; 701. First arc-shaped guide wall; 702. Straight guide wall; 703. Second arc-shaped guide wall;

[0042] 8. A4 anoxic pool; 9. A5 anoxic pool; 10. A6 anoxic pool; 11. A7 anoxic pool; 12. O1 aerobic pool; 13. O2 aerobic pool; 14. O3 aerobic pool; 15. A8 anoxic pool.

[0043] 16. A9 anoxic tank 16; 1601. Emptying sump; 1602. Emptying pipe;

[0044] 17. Second aerobic tank; 1701, O4 aerobic unit 1701; 1702, O5 aerobic unit 1702; 1703, water collection tank; 1704, drain pipe;

[0045] 18. Internal reflux system; 1801. Reflux pump; 1802. Nitrified liquor collection tank; 1803. Nitrified liquor reflux channel;

[0046] 19. Sludge mixing system; 1901. Main sludge inlet pipe; 1902. Third sludge inlet hole; 1903. First sludge inlet hole; 1904. Third sludge inlet trough; 1905. First sludge inlet trough; 1906. First tank sludge inlet pipe; 1907. Fourth sludge inlet hole; 1908. Second sludge inlet hole; 1909. Fourth sludge inlet trough; 1910. Second sludge inlet trough; 1911. Second tank sludge inlet pipe; 1912. Third tank sludge inlet; 1913. Fourth tank sludge inlet; 1914. Sludge mixer. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In related technologies, large-scale sewage treatment plants occupy a large area, and land resources are scarce in the process of urbanization. The construction of new sewage treatment plants faces the problems of high land acquisition costs and difficult site selection. On the other hand, many existing sewage treatment plants have outdated treatment processes and low efficiency due to early design limitations, making it difficult to meet the growing demand for sewage purification. They urgently need to be upgraded, but the upgrade is also limited by the site, making it difficult to add large-scale treatment equipment to improve efficiency.

[0049] In view of this, embodiments of this application propose an intensive biological wastewater treatment system.

[0050] An intensive biological wastewater treatment system includes a water distribution channel 2, a water distribution system 1, one or more biological tank units, a sludge distribution system 19, and an internal recirculation system 18;

[0051] The biological pool unit includes a first area and a second area arranged side by side along the water distribution channel 2. The biological pool unit integrates multiple functional pools, including a pre-anoxic pool, an anaerobic pool, a first anoxic pool, a second anoxic pool and a third anoxic pool arranged in the first area, and a first aerobic pool, a fourth anoxic pool and a second aerobic pool 17 arranged in the second area.

[0052] The pre-anoxic tank, the anaerobic tank, the first anoxic tank, the second aerobic tank 17, and the fourth anoxic tank are arranged sequentially along the direction of the water distribution channel 2. The water distribution channel 2 is directly connected to the inlet of the pre-anoxic tank, the anaerobic tank, the first anoxic tank, and the fourth anoxic tank. The pre-anoxic tank, the anaerobic tank, the second anoxic tank, the third anoxic tank, the first aerobic tank, the fourth anoxic tank, and the second aerobic tank 17 are connected in series. The inlet of the first anoxic tank is connected to the water distribution channel 2, the outlet of the first anoxic tank is connected to the second anoxic tank, and the outlet of the second aerobic tank 17 is connected to a drain pipe 1704.

[0053] The outlet of the water distribution system 1 is connected to the water distribution channel 2, and the water distribution system 1 provides the wastewater to be treated to the biological pool unit through the water distribution channel 2; the sludge distribution system 19 is connected to the biological pool unit and is used to provide the biological pool unit with return sludge.

[0054] Specifically, the biological pool unit includes a first region and a second region, which are arranged side by side along the extension direction of the water distribution channel 2. The first region contains three sub-regions distributed perpendicular to the extension direction of the water distribution channel 2, namely the first sub-region, the second sub-region, and the third sub-region; the second region contains two sub-regions distributed perpendicular to the extension direction of the water distribution channel 2, namely the fourth sub-region and the fifth sub-region. The biological pool unit integrates multiple functional pools, including a pre-anoxic pool, an anaerobic pool, a first anoxic pool, a second anoxic pool, a third anoxic pool, a first aerobic pool, a fourth anoxic pool, and a second aerobic pool 17. The pre-anoxic pool, the anaerobic pool, and the first anoxic pool are arranged in the first sub-region, the second anoxic pool is arranged in the second sub-region, the third anoxic pool is arranged in the third sub-region, the first aerobic pool is arranged in the fifth sub-region, and the fourth anoxic pool and the second aerobic pool 17 are arranged in the fourth sub-region.

[0055] The pre-anoxic tank, anaerobic tank, first anoxic tank, second aerobic tank 17, and fourth anoxic tank are arranged sequentially along the direction of the water distribution channel 2. The pre-anoxic tank, anaerobic tank, second anoxic tank, third anoxic tank, first aerobic tank, fourth anoxic tank, and second aerobic tank 17 are connected in series. The inlet end of the first anoxic tank is connected to the water distribution channel 2, the outlet end of the first anoxic tank is connected to the second anoxic tank, and the outlet end of the second aerobic tank 17 is connected to the drain pipe 1704.

[0056] A first water passage 201, a second water passage 202, a third water passage 203, and a fourth water passage 204 are respectively provided on the water distribution channel 2 at the positions corresponding to the pre-anoxic tank, the anaerobic tank, the first anoxic tank, and the fourth anoxic tank, so as to communicate with the corresponding functional tanks; the outlet end of the water distribution system 1 is connected to the water distribution channel 2, and the wastewater to be treated is provided to the corresponding functional tank through the water distribution channel 2; the sludge discharge end of the sludge distribution system 19 is connected to the pre-anoxic tank, and the sludge is provided to the pre-anoxic tank for return; the inlet end of the internal return system 18 is connected to the first aerobic tank, and the outlet end is connected to the first anoxic tank, so that the nitrified liquid in the first aerobic tank can be returned to the first anoxic tank.

[0057] Wastewater entering the pre-anoxic tank undergoes partial oxidation and weak ammoniation and nitrification. After mixing with the returned sludge entering the pre-anoxic tank, it undergoes anaerobic phosphorus release. The wastewater entering the pre-anoxic tank passes through the anaerobic tank and then enters the second anoxic tank together with the wastewater entering the first anoxic tank. After being fully mixed, it enters the third anoxic tank. Denitrification and nitrogen removal reactions occur in the anaerobic tank, the first anoxic tank, the second anoxic tank, and the third anoxic tank. Then, it enters the first aerobic tank for aerobic treatment. The wastewater after aerobic treatment passes through the fourth anoxic tank and then enters the second aerobic tank 17. In the second aerobic tank 17, nitrification, oxidation, and aerobic phosphorus uptake occur. Finally, it is discharged through the drain pipe 1704.

[0058] The above setup integrates multiple functional pools, enabling multi-stage wastewater treatment with different functions. It effectively removes various pollutants such as organic matter, ammonia nitrogen, total nitrogen, and total phosphorus from wastewater, thereby ensuring the efficiency of wastewater treatment. At the same time, by rationally zoning and arranging each functional pool, the space is optimized, making the overall structure more compact and centralized. Compared with the conventional linear layout, it greatly saves floor space and helps reduce infrastructure costs.

[0059] In practical applications, the number of functional pools can be the same or different, and there can be one or more, which can be flexibly configured according to the sewage treatment needs and the required floor space.

[0060] Example 1

[0061] See Figure 1 The intensive biological wastewater treatment system provided in this embodiment has a biological tank unit. The multiple functional tanks integrated within the biological tank unit specifically include:

[0062] a1 pre-anoxic pool 3;

[0063] The anaerobic tanks include A1 anaerobic tank 4 and A2 anaerobic tank 5, which are arranged in series and separated by a flow guide wall.

[0064] The first anoxic tank, namely a2 anoxic tank 6;

[0065] The second anoxic pool includes an anoxic pool 7 (a3) ​​and anoxic pool 8 (a4), which are arranged in series and separated by a flow guide wall.

[0066] The third anoxic pool includes a5 anoxic pool 9, a6 anoxic pool 10 and a7 anoxic pool 11, which are arranged in series and separated by a flow guide wall.

[0067] The first aerobic tank includes O1 aerobic tank 12, O2 aerobic tank 13 and O3 aerobic tank 14, which are arranged in series and separated by a flow guide wall.

[0068] The fourth anoxic pool includes an anoxic pool 15 (a8) and anoxic pool 16 (a9), which are arranged in series and separated by a flow guide wall.

[0069] The second aerobic tank 17 includes O4 aerobic unit 1701 and O5 aerobic unit 1702.

[0070] The water distribution system 1 is connected to the outlet end of the main inlet pipe 101. The water distribution system 1 includes an inlet weir 102. Wastewater that has undergone pretreatment or primary treatment enters the water distribution system 1 from the main inlet pipe 101. The water flows over the inlet weir 102 and enters the distribution channel 2, entering the corresponding functional pools through the first water passage 201, the second water passage 202, the third water passage 203, and the fourth water passage 204. The diameter of the above four water passages can be reasonably set according to different inlet flow requirements. Preferably, the inlet flow ratio is a1 pre-anoxic pool 3 : A1 anaerobic pool 4 : a2 anoxic pool 6 = 20%Q : 40%Q : 40%Q, and the inlet flow of a8 anoxic pool 15 is less than 10%Q, where Q represents the total inlet flow of a biological pool unit.

[0071] By optimizing the flow ratio of the influent in each stage, the anoxic and anaerobic stages can make the maximum use of the carbon source in the influent, effectively ensuring the concentration of carbon source in each stage, while ensuring sufficient hydraulic retention time in each stage, which helps to improve denitrification efficiency.

[0072] The sludge mixing system 19 delivers the returned sludge from the secondary sedimentation tank to the a1 pre-anoxic tank 3. The wastewater entering the a1 pre-anoxic tank 3 undergoes partial oxidation and weak ammonification and nitrification reactions. The returned sludge entering the a1 pre-anoxic tank 3 is mixed and then reacts in an anaerobic phosphorus release reaction.

[0073] The internal reflux system 18 includes a reflux pump 1801, a nitrification liquid collection tank 1802, and a nitrification liquid reflux channel 1803. The reflux pump 1801 is arranged in the O3 aerobic tank 14. The liquid outlet end of the reflux pump 1801 is connected to the nitrification liquid collection tank 1802. The liquid outlet end of the nitrification liquid collection tank 1802 is connected to the a2 anoxic tank 6 through the nitrification liquid reflux channel 1803. Thus, the nitrification liquid in the O3 aerobic tank 14 can be lifted to the nitrification liquid collection tank 1802 under the action of the reflux pump 1801, and then reflux to the a2 anoxic tank 6 through the nitrification liquid reflux channel 1803. The reflux flow rate is 2.5Q - 4.0Q, where Q represents the total influent flow rate of a biological tank unit.

[0074] The sewage entering the a1 pre-anoxic tank 3 sequentially passes along the diversion wall in an "S" shape through the A1 anaerobic tank 4 and the A2 anaerobic tank 5, and then enters the a3 anoxic tank 7 together with the sewage entering the a2 anoxic tank 6. A stirrer is arranged in the a3 anoxic tank 7, and a first arc-shaped diversion wall 701, a straight-line diversion wall 702, and a second arc-shaped diversion wall 703 are arranged. The sewage can be pushed and fully mixed along the first arc-shaped diversion wall 701, the straight-line diversion wall 702, and the second arc-shaped diversion wall 703 under the action of the stirrer, and then enters the a4 anoxic tank 8. The a4 anoxic tank 8 and the a3 anoxic tank 7 have the same structural layout. After the sewage is fully pushed and mixed in the a4 anoxic tank 8, it enters the a5 anoxic tank 9, and then sequentially passes along the diversion wall in an "S" shape through the a6 anoxic tank 10 and the a7 anoxic tank 11 and enters the O1 aerobic tank 12.

[0075] With the setting of the first arc-shaped diversion wall 701, the straight-line diversion wall 702, and the second arc-shaped diversion wall 703, the full mixing of the internal reflux nitrification liquid can be achieved, while ensuring a relatively long hydraulic retention time to ensure the full denitrification reaction.

[0076] Multiple aeration units are respectively arranged in the O1 aerobic tank 12, the O2 aerobic tank 13, and the O3 aerobic tank 14. Specifically, "Feng" character aeration pipes can be used for aeration and oxygen supply, and the oxygen is provided by an external blower. Preferably, the dissolved oxygen concentrations in the O1 aerobic tank 12, the O2 aerobic tank 13, and the O3 aerobic tank 14 can be set stepwise, which are 2.87m 3 / min, 2.51m 3 / min, 2.05m 3 / min.

[0077] After the sewage is subjected to aerobic treatment in the O1 aerobic tank 12, the O2 aerobic tank 13, and the O3 aerobic tank 14 in sequence, it enters the a8 anoxic tank 15, passes along the diversion wall in an "S" shape through the a9 anoxic tank 16, and then enters the second aerobic tank 17. The dissolved oxygen concentrations of the O4 aerobic unit 1701 and the O5 aerobic unit 1702 in the second aerobic tank 17 are 3.6m 3 / min and 2.7m3 The water volume is 1000 cubic meters per minute. After undergoing an aerobic reaction, it finally enters the water collection tank 1703 and is discharged through the drain pipe 1704.

[0078] Under limited space conditions, by setting up each aerobic section in a modular fashion and setting the dissolved oxygen concentration in a stepped manner, the aeration volume can be maximized and utilized to achieve efficient organic matter degradation and nitrogen nitrification.

[0079] Optionally, an emptying sump 1601 and an emptying pipe 1602 are provided in the a9 anoxic pool 16 to facilitate the drainage of pool water during maintenance.

[0080] Optionally, curved chamfered structures such as cement arc walls can be installed at the corners of each functional pool to prevent stagnant water and make the water flow in an "S" shape.

[0081] In this embodiment, the influent flow rate ratio is pre-anoxic tank: anaerobic tank: first anoxic tank = 20%Q: 40%Q: 40%Q (Q is the total influent flow rate of a biological tank unit).

[0082] The volume ratio of each biological tank is as follows: pre-anoxic tank : anaerobic tank : (first anoxic tank + second anoxic tank + third anoxic tank) : first aerobic tank : fourth anoxic tank : second aerobic tank = 3.3%V : 13.3% V : 35% V : 36.6% V : 8.3% V : 3.3%V (V is the total volume of a biological tank unit).

[0083] The dissolved oxygen concentration in multiple aeration units of the O1 aerobic tank 12 was all 2.87 m³. 3 The dissolved oxygen concentration in multiple aeration units of the O2 aerobic tank 13 was 2.51 m³ / min. 3 The dissolved oxygen concentration in multiple aeration units of the O3 aerobic tank 14 was 2.05 m³ / min. 3 The dissolved oxygen concentration in the O4 aerobic unit 1701 of the second aerobic tank 17 is 3.6 m³ / min. 3 The dissolved oxygen concentration in aerobic unit 1702 (O5 / min) is 2.7 m³ / min. 3 / min;

[0084] The average concentration of COD (Chemical Oxygen Demand) in the system influent was 535 mg / L, with a removal rate of 90.7%; the average concentration of BOD (Biochemical Oxygen Demand) was 300 mg / L, with a removal rate of 96.7%; the average concentration of TN (Total Nitrogen) was 70 mg / L, with a removal rate of 78.6%; the average concentration of ammonia nitrogen was 50 mg / L, with a removal rate of 90.0%; and the average concentration of TP (Total Phosphorus) was 8.5 mg / L, with a removal rate of 94.1%. The system achieved a removal rate of over 90% for all pollutants.

[0085] Example 2

[0086] See Figure 2 The intensive biological wastewater treatment system provided in this embodiment has four biological tank units, namely tank one, tank two, tank three and tank four. The arrangement of each functional tank is the same as in embodiment one, and will not be repeated here.

[0087] There are two water distribution channels 2, namely the first water distribution channel 21 and the second water distribution channel 22, which are arranged in parallel. Pool 1 and Pool 2 are arranged side-by-side along the first water distribution channel 21. The first section of the first water distribution channel 21 (i.e.,...) Figure 2 The left section of the first water distribution channel 21 shown corresponds to the location of a pool, and the second section of the first water distribution channel 21 (i.e., Figure 2 The right section of the first water distribution channel 21 shown corresponds to the location of the second pool, and the structures of the first and second pools are symmetrical. The third and fourth pools are arranged side by side along the second water distribution channel 22, and the first section of the second water distribution channel 22 (i.e., the right section of the second water distribution channel 21) corresponds to the location of the second pool. Figure 2 The left section of the second water distribution channel 22 shown corresponds to the position of the three pools, and the second section of the second water distribution channel 22 (that is...) Figure 2 The left section of the second water distribution channel 22 shown in the figure corresponds to the position of the fourth pool. The third and fourth pools are symmetrical in structure, and the third and fourth pools are arranged symmetrically with the first and second pools.

[0088] The water distribution system 1 is located near the first water distribution channel 21, between the first and second pools; the sludge distribution system 19 is located near the second water distribution channel 22, between the third and fourth pools; the water distribution system 1 and the sludge distribution system 19 are arranged symmetrically on both sides of the two water distribution channels 2.

[0089] Preferably, the water distribution system 1 adopts a symmetrical structure, which includes a main inlet pipe 101, a first water distribution unit, and a second water distribution unit. The first water distribution unit and the second water distribution unit are respectively connected to the outlet end of the main inlet pipe 101. The first water distribution unit is located on one side of pool one, and the second water distribution unit is located on one side of pool two, arranged symmetrically from left to right. The outlet end of the first water distribution unit is connected to pool one and pool three respectively, supplying sewage to pool one and pool three respectively; the outlet end of the second water distribution unit is connected to pool two and pool four respectively, supplying sewage to pool two and pool four respectively.

[0090] Specifically, see Figure 3 The first water distribution unit includes a first pool inlet weir 102, a third pool inlet weir 103, a first pool inlet trough 104, a third pool inlet trough 105, and a third pool inlet pipe 106. The first pool inlet trough 104 is located below the first pool inlet weir 102 and is directly connected to the left section of the first water distribution channel 21. When sewage flows out from the main inlet pipe 101 into the first water distribution unit, the water flows over the first pool inlet weir 102, enters the first pool inlet trough 104, and then directly enters the left section of the first water distribution channel 21, thus supplying water to the first pool. The three-pool inlet trough 105 is located below the three-pool inlet weir 103. To facilitate water supply to the three pools which are far away, a three-pool inlet pipe 106 is connected to the outlet end of the three-pool inlet trough 105 to achieve the connection between the three-pool inlet trough 105 and the left section of the second inlet channel. When sewage flows out from the main inlet pipe 101 and enters the first water distribution unit, the water flows over the three-pool inlet weir 103 and into the three-pool inlet trough 105. Then, it flows into the left section of the second water distribution channel 22 through the three-pool inlet pipe 106 to achieve water supply to the three pools.

[0091] Similarly, the second water distribution unit includes a second pool inlet weir 107, a fourth pool inlet weir 108, a second pool inlet trough 109, a fourth pool inlet trough 110, and a fourth pool inlet pipe 111. The second pool inlet trough 109 is located below the second pool inlet weir 107 and is directly connected to the right section of the first water distribution channel 21. When sewage flows out of the main inlet pipe 101 and enters the second water distribution unit, the water flows over the second pool inlet weir 107, enters the second pool inlet trough 109, and then directly enters the right section of the first water distribution channel 21, thus supplying water to the second pool. The four-pool inlet trough 110 is located below the four-pool inlet weir 108. To facilitate water supply to the four pools which are far away, a four-pool inlet pipe 111 is connected to the outlet end of the four-pool inlet trough 110 to achieve communication between the four-pool inlet trough 110 and the right section of the second inlet channel. When sewage flows out of the main inlet pipe 101 and enters the second water distribution unit, the water flows over the four-pool inlet weir 108 and into the four-pool inlet trough 110. Then, it flows into the right section of the second water distribution channel 22 through the four-pool inlet pipe 111 to achieve water supply to the four pools.

[0092] Preferably, the liquid level of the three-pool inlet tank 105 is lower than the bottom elevation of the first-pool inlet tank 104, meaning the overall vertical elevation of the three-pool inlet tank 105 is lower than that of the first-pool inlet tank 104. This allows for sufficient installation space below the first-pool inlet tank 104 for the three-pool inlet pipe 106, facilitating pipe installation. Similarly, the liquid level of the four-pool inlet tank 110 is lower than the bottom elevation of the second-pool inlet tank 109, meaning the overall vertical elevation of the four-pool inlet tank 110 is lower than that of the second-pool inlet tank 109, facilitating the installation of the four-pool inlet pipe 111.

[0093] Preferably, both the inlet weir 103 of the third pool and the inlet weir 108 of the fourth pool are equipped with weir gates to control the flow of water. Specifically, when the weir gates on the inlet weirs 103 and 108 of the third pool are open, water can flow through the inlet weirs 103 and 108 of the third pool into the third and fourth pools. When the weir gates on the inlet weirs 103 and 108 of the third pool are closed, sewage cannot pass over the inlet weirs 103 and 108 of the third pool after entering the water distribution system 1, and therefore cannot enter the third and fourth pools.

[0094] By setting up the weir gate, the water distribution mode of the water distribution system 1 can be flexibly selected according to different sewage treatment volumes. When all four biological tanks need to work, the weir gates on the inlet weirs 103 and 108 of the third and fourth tanks are opened, so that the water distribution system 1 can distribute water to the four biological tanks respectively. When only the first and second biological tanks need to work, the weir gates on the inlet weirs 103 and 108 of the third and fourth tanks are closed, so that the water distribution system 1 only distributes water to the first and second tanks.

[0095] The sludge mixing system 19 also adopts a symmetrical structure, including a main sludge inlet pipe 1901, a sludge mixing chamber, a first sludge mixing unit, and a second sludge mixing unit. The sludge mixing chamber is located at the sludge outlet end of the main sludge inlet pipe 1901. The first and second sludge mixing units are respectively connected to both sides of the sludge mixing chamber. The first sludge mixing unit is located on one side of the third tank, and the second sludge mixing unit is located on one side of the fourth tank. The first and second sludge mixing units are arranged symmetrically from left to right. The sludge outlet end of the first sludge mixing unit is connected to the first and third tanks respectively, providing return sludge to the first and third tanks respectively. The sludge outlet end of the second sludge mixing unit is connected to the second and fourth tanks respectively, providing return sludge to the second and fourth tanks respectively.

[0096] Specifically, see Figure 3The first sludge mixing unit includes a first sludge mixing hole 1903, a third sludge mixing hole 1902, a first sludge inlet trough 1905, a third sludge inlet trough 1904, and a first sludge inlet pipe 1906. The first sludge mixing hole 1903 and the third sludge mixing hole 1902 are located on one side of the sludge mixing chamber and communicate with the first sludge inlet trough 1905 and the third sludge inlet trough 1904, respectively. Both the first sludge mixing hole 1903 and the third sludge mixing hole 1902 are located below the sludge liquid level in the sludge mixing chamber and flow out in a submerged manner. The first sludge inlet trough 1905 is connected to the a1 pre-anoxic tank 3 of the first tank via the first sludge inlet pipe 1906. When sludge flows from... After entering the sludge mixing chamber through the main sludge inlet pipe 1901, the sludge enters the first sludge inlet trough 1905 through the first sludge mixing hole 1903, and then enters the a1 pre-anoxic tank 3 of the first tank through the first tank sludge inlet pipe 1906, thus achieving sludge mixing for the first tank. The third sludge inlet trough 1904 is directly connected to the a1 pre-anoxic tank 3 of the third tank through the third tank sludge inlet 1912. When the sludge enters the sludge mixing chamber through the main sludge inlet pipe 1901, it enters the third sludge inlet trough 1904 through the third sludge mixing hole 1902, and then directly enters the a1 pre-anoxic tank 3 of the third tank through the third tank sludge inlet 1912, thus achieving sludge mixing for the three tanks.

[0097] Similarly, the second sludge mixing unit includes a second sludge mixing hole 1908, a fourth sludge mixing hole 1907, a second sludge inlet trough 1910, a fourth sludge inlet trough 1909, and a second tank sludge inlet pipe 1911; the second sludge mixing hole 1908 and the fourth sludge mixing hole 1907 are located on the other side of the sludge mixing chamber and are connected to the second sludge inlet trough 1910 and the fourth sludge inlet trough 1909 respectively. Both the second sludge mixing hole 1908 and the fourth sludge mixing hole 1907 are located below the sludge liquid level in the sludge mixing chamber and flow out in a submerged manner; the second sludge inlet trough 1910 is connected to the a1 pre-anoxic tank 3 of the second tank through the second tank sludge inlet pipe 1911. After the sludge enters the sludge mixing chamber through the main sludge inlet pipe 1901, it enters the second sludge inlet trough 1910 through the second sludge inlet hole 1908, and then enters the a1 pre-anoxic tank 3 of the second tank through the second tank sludge inlet pipe 1911, thus achieving sludge mixing in the second tank. The fourth sludge inlet trough 1909 is directly connected to the a1 pre-anoxic tank 3 of the fourth tank through the fourth tank sludge inlet 1913. When the sludge enters the sludge mixing chamber through the main sludge inlet pipe 1901, it enters the fourth sludge inlet trough 1909 through the fourth sludge inlet hole 1907, and then directly enters the a1 pre-anoxic tank 3 of the fourth tank through the fourth tank sludge inlet 1913, thus achieving sludge mixing in the fourth tank.

[0098] Preferably, the liquid level of the first sludge inlet 1905 is lower than the bottom elevation of the third sludge inlet 1904, meaning the vertical elevation of the first sludge inlet 1905 is generally lower than the vertical elevation of the third sludge inlet 1904. This allows for the provision of installation space for a sludge inlet pipe 1906 below the third sludge inlet 1904, facilitating pipe installation. Similarly, the liquid level of the second sludge inlet 1910 is lower than the bottom elevation of the fourth sludge inlet 1909, meaning the vertical elevation of the second sludge inlet 1910 is generally lower than the vertical elevation of the fourth sludge inlet 1909, facilitating the installation of the sludge inlet pipe 1911 for the second sludge inlet.

[0099] Preferably, the main inlet pipe 101, the third pool inlet pipe 106, the fourth pool inlet pipe 111, the main sludge inlet pipe 1901, the first pool sludge inlet pipe 1906, and the second pool sludge inlet pipe 1911 are staggered in elevation at their intersection points to avoid collisions and interference between the pipes.

[0100] Preferably, a sludge agitator 1914 is installed in the sludge mixing system 19 to agitate and prevent sludge from settling.

[0101] The intensive biological wastewater treatment system provided in this embodiment, under the condition of limited land area, achieves uniform distribution of influent and return sludge by symmetrically setting up water distribution system 1 and sludge distribution system 19, and can select or switch different system layouts according to different wastewater treatment volumes.

[0102] The intensive biological wastewater treatment system provided in this embodiment performs the following process for water and sludge preparation in the four biological tank units:

[0103] After the sewage enters the water distribution system 1 from the main inlet pipe 101:

[0104] Path 1: The water flows over the inlet weir 102 of the first pool and into the inlet channel 104 of the first pool, then into the left section of the first distribution channel 21, and then into the first pool.

[0105] Path 2: The water flows over the inlet weir 107 of the second pool and into the inlet channel 109 of the second pool, then into the right section of the first distribution channel 21, and then into the second pool.

[0106] Path 3: The water flows over the inlet weir 103 of the third pool and into the inlet channel 105 of the third pool, then through the inlet pipe 106 of the third pool into the left section of the second distribution channel 22, and then into the third pool.

[0107] Path four: the water flows over the inlet weir 108 of the fourth pool and into the inlet channel 110 of the fourth pool, then through the inlet pipe 111 of the fourth pool into the right section of the second distribution channel 22, and then into the fourth pool.

[0108] After the returned sludge enters the sludge mixing chamber of the sludge mixing system 19 from the main sludge inlet pipe 1901:

[0109] Path 1: The sludge enters the third sludge inlet trough 1904 through the sludge distribution hole of the three tanks, and then enters the a1 pre-anoxic tank 3 of the three tanks through the sludge inlet 1912 of the three tanks.

[0110] Path 2: The sludge enters the fourth sludge inlet trough 1909 through the sludge distribution hole of the fourth tank, and then enters the a1 pre-anoxic tank 3 of the fourth tank through the sludge inlet 1913 of the fourth tank.

[0111] Path 3: The sludge enters the first sludge inlet trough 1905 through the sludge distribution hole of the first tank, and is then sent to the a1 pre-anoxic tank 3 of the first tank through the sludge inlet pipe 1906.

[0112] Path 4: The sludge enters the second sludge inlet trough 1910 through the sludge distribution hole of the second tank, and is then sent to the a1 pre-anoxic tank 3 of the second tank through the sludge inlet pipe 1911.

[0113] The flow and treatment process of sewage and sludge in each functional tank after entering a single biological tank unit is the same as in Example 1, and will not be repeated here.

[0114] Example 3

[0115] See Figure 4 Unlike Embodiments 1 and 2, the intensive biological wastewater treatment system provided in this embodiment has two biological tank units, namely Tank 1 and Tank 2. Tank 1 and Tank 2 are arranged side by side along the direction of the water distribution channel 2, and the structures of Tank 1 and Tank 2 are symmetrical from left to right. The left section of the water distribution channel 2 corresponds to the position of Tank 1, and the right section of the water distribution channel 2 corresponds to the position of Tank 2.

[0116] The water distribution system 1 is located on one side near the water distribution channel 2, and is situated between the first and second pools. Preferably, the water distribution system 1 can also adopt a symmetrical structure, connecting to the first and second pools respectively, thereby achieving separate water distribution to the first and second pools.

[0117] Specifically, the water distribution system 1 can adopt the same structure as in Embodiment 2. When distributing water to the first and second pools, it is only necessary to close the gate valves on the inlet weirs 103 and 108 of the third and fourth pools. In this way, after the sewage enters the water distribution system 1 from the main inlet pipe 101, it cannot pass through the inlet weirs 103 and 108 of the third and fourth pools, and can only flow in the following two ways:

[0118] Path 1: The water flows over the inlet weir 102 of the first pool, enters the inlet channel 104 of the first pool, then enters the left section of the distribution channel 2, and then enters the first pool.

[0119] Path 2: The water flows over the inlet weir 107 of the second pool, enters the inlet channel 109 of the second pool, then enters the right section of the distribution channel 2, and then enters the second pool.

[0120] The arrangement of the functional pools within the first and second pools, as well as the arrangement of the sludge mixing system 19 and the internal reflux system 18, can refer to Embodiment 1. The flow and treatment process of sewage and sludge in each functional pool after entering a single biological pool unit is also the same as in Embodiment 1, so it will not be described in detail here.

[0121] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0122] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "includes a..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0123] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. An intensive sewage biological treatment system, characterized by It comprises: a water distribution channel, a water distribution system, one or more biological tank units, a sludge distribution system and an internal reflux system; the biological tank unit comprises a first area and a second area arranged side by side along the water distribution channel, and a plurality of functional tanks are integrated in the biological tank unit, the plurality of functional tanks comprising a pre-anoxic tank, an anaerobic tank, a first anoxic tank, a second anoxic tank and a third anoxic tank arranged in the first area, and a first aerobic tank, a fourth anoxic tank and a second aerobic tank arranged in the second area; the pre-anoxic tank, the anaerobic tank, the first anoxic tank, the second aerobic tank, the fourth anoxic tank are arranged in sequence along the direction of the water distribution channel, and the water distribution channel is directly communicated with the water inlet end of the pre-anoxic tank, the anaerobic tank, the first anoxic tank and the fourth anoxic tank; the pre-anoxic tank, the anaerobic tank, the second anoxic tank, the third anoxic tank, the first aerobic tank, the fourth anoxic tank and the second aerobic tank are connected in sequence, the water inlet end of the first anoxic tank is connected with the water distribution channel, the water outlet end of the first anoxic tank is connected with the second anoxic tank, and the water outlet end of the second aerobic tank is connected with a drain pipe; the water outlet end of the water distribution system is connected with the water distribution channel, and the water distribution system provides sewage to be treated to the biological tank unit through the water distribution channel; the sludge distribution system is connected with the biological tank unit for providing reflux sludge to the biological tank unit.

2. The intensive sewage biological treatment system according to claim 1, wherein: the intensive sewage biological treatment system comprises two biological tank units, namely a first tank and a second tank, the first tank and the second tank are arranged side by side along the direction of the water distribution channel, and the first tank and the second tank are symmetrical in structure.

3. The intensive sewage biological treatment system according to claim 1, wherein: the intensive sewage biological treatment system comprises four biological tank units, namely a first tank, a second tank, a third tank and a fourth tank; the water distribution channel is provided with two water distribution channels, namely a first water distribution channel and a second water distribution channel, the first water distribution channel and the second water distribution channel are arranged in parallel; the first tank and the second tank are arranged side by side along the first water distribution channel, a first section of the first water distribution channel corresponds to the position of the first tank, a second section of the first water distribution channel corresponds to the position of the second tank, and the first tank and the second tank are symmetrical in structure; the third tank and the fourth tank are arranged side by side along the second water distribution channel, a first section of the second water distribution channel corresponds to the position of the third tank, a second section of the second water distribution channel corresponds to the position of the fourth tank, the third tank and the fourth tank are symmetrical in structure, and the third tank, the fourth tank, the first tank and the second tank are arranged symmetrically.

4. The intensive sewage biological treatment system according to claim 3, wherein: the water distribution system is arranged close to the first water distribution channel and located between the first tank and the second tank; the sludge distribution system is arranged close to the second water distribution channel and located between the third tank and the fourth tank; and the water distribution system and the sludge distribution system are arranged symmetrically.

5. The intensive sewage biological treatment system according to claim 4, wherein: The water distribution system comprises a total water inlet pipe, a first water distribution unit and a second water distribution unit; The first water distribution unit and the second water distribution unit are connected at the water outlet end of the total water inlet pipe, the first water distribution unit is located at one pool side, the second water distribution unit is located at two pool side, and the first water distribution unit and the second water distribution unit are symmetrically arranged; The water outlet end of the first water distribution unit is respectively connected to the one pool and the three pool to provide sewage to the one pool and the three pool respectively; the water outlet end of the second water distribution unit is respectively connected to the two pool and the four pool to provide sewage to the two pool and the four pool respectively.

6. The intensive sewage biological treatment system according to claim 5, wherein: The first water distribution unit comprises a one pool water inlet weir, a three pool water inlet weir, a one pool water inlet tank, a three pool water inlet tank and a three pool water inlet pipe; the one pool water inlet tank is arranged below the one pool water inlet weir and directly communicates with the first section of the first water distribution channel; the three pool water inlet tank is arranged below the three pool water inlet weir and communicates with the first section of the second water distribution channel through the three pool water inlet pipe; The second water distribution unit comprises a two pool water inlet weir, a four pool water inlet weir, a two pool water inlet tank, a four pool water inlet tank and a four pool water inlet pipe; the two pool water inlet tank is arranged below the two pool water inlet weir and directly communicates with the second section of the first water distribution channel; the four pool water inlet tank is arranged below the four pool water inlet weir and communicates with the second section of the second water distribution channel through the four pool water inlet pipe.

7. The intensive sewage biological treatment system according to claim 6, wherein: The liquid level elevation of the three pool water inlet tank is lower than the pool bottom elevation of the one pool water inlet tank, and the liquid level elevation of the four pool water inlet tank is lower than the pool bottom elevation of the two pool water inlet tank.

8. The intensive sewage biological treatment system according to claim 4, wherein: The mud distribution system comprises a total mud inlet pipe, a mud distribution chamber, a first mud distribution unit and a second mud distribution unit; The mud distribution chamber is arranged at the mud outlet end of the total mud inlet pipe, and the first mud distribution unit and the second mud distribution unit are respectively connected at both sides of the mud distribution chamber, the first mud distribution unit is located at three pool side, the second mud distribution unit is located at four pool side, and the first mud distribution unit and the second mud distribution unit are symmetrically arranged; The mud outlet end of the first mud distribution unit is respectively connected to the one pool and the three pool to provide return sludge to the one pool and the three pool respectively; the mud outlet end of the second mud distribution unit is respectively connected to the two pool and the four pool to provide return sludge to the two pool and the four pool respectively.

9. The intensive sewage biological treatment system according to claim 8, wherein: The first mud distribution unit comprises a first mud distribution hole, a third mud distribution hole, a first mud inlet slot, a third mud inlet slot and a one-pool mud inlet pipe; the first mud distribution hole and the third mud distribution hole are arranged on one side of the mud distribution cavity and communicate with the first mud inlet slot and the third mud inlet slot respectively; the first mud inlet slot communicates with the pre-anoxic tank of the one-pool through the one-pool mud inlet pipe, and the third mud inlet slot directly communicates with the pre-anoxic tank of the three-pool; The second mud distribution unit comprises a second mud distribution hole, a fourth mud distribution hole, a second mud inlet slot, a fourth mud inlet slot and a two-pool mud inlet pipe; the second mud distribution hole and the fourth mud distribution hole are arranged on the other side of the mud distribution cavity and communicate with the second mud inlet slot and the fourth mud inlet slot respectively; the second mud inlet slot communicates with the pre-anoxic tank of the two-pool through the two-pool mud inlet pipe, and the fourth mud inlet slot directly communicates with the pre-anoxic tank of the four-pool.

10. The intensive sewage biological treatment system according to claim 9, characterized in that: The liquid level elevation of the first mud inlet slot is lower than the pool bottom elevation of the third mud inlet slot, and the liquid level elevation of the second mud inlet slot is lower than the pool bottom elevation of the fourth mud inlet slot.

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