Compact biological sewage treatment system

Abstract

The utility model discloses a compact biological sewage treatment system, belongs to the field of sewage treatment, and solves the problem that the existing sewage treatment plant occupies a large area. The device comprises at least one sub-treatment unit, each sub-treatment unit comprises a main water distribution tank, two biological tank groups, a water outlet channel and a nitrification liquid backflow tank, and each biological tank group comprises a pre-anoxic tank, an anaerobic tank, an anoxic tank, an aerobic tank and a rear aerobic tank which are connected in sequence; distribution water tanks are respectively arranged on two sides of the main water distribution tank, and the two distribution water tanks are respectively communicated with the two pre-anoxic tanks; the rear aerobic tank is communicated with the water outlet channel; the nitrification liquid backflow pool is arranged above the two rear aerobic pools, is connected with the rear aerobic pools through a nitrification liquid lifting pump, and is connected to the front end of the anoxic pool through a nitrification liquid backflow channel. According to the utility model, an intensive structural layout is adopted, and a compact arrangement form is adopted, so that the occupied area of the biological sewage treatment system is saved, and the capital construction cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sewage treatment, and particularly relates to a compact sewage biological treatment system. BACKGROUND

[0002] Under the high standard requirement of water output at present, a large number of sewage treatment plants have carried out upgrading and reconstruction construction. With the increase of urbanization rate, the urban population density is also rising, especially in the economic core areas such as Beijing-Tianjin-Hebei, Yangtze River Delta and Pearl River Delta, the land resources have entered the white-hot competition stage of "every inch of land is worth gold", and the sewage treatment plant is a typical land-intensive municipal facility. According to the 2024 survey report of the Ministry of Housing and Urban-Rural Development, 62% of the second-tier cities encountered site selection disputes when building new sewage treatment plants, and 41% of the projects caused the delay of construction period due to the land acquisition negotiation period exceeding 18 months, and some urban areas even appeared the embarrassing situation of "sewage pipe network and plant station". On the other hand, in the process of upgrading and reconstruction of the existing urban sewage treatment plant, the early plant area reserved land is generally insufficient, and some plants do not have the condition of expansion, so it is difficult to add large-scale treatment equipment to improve the efficiency. SUMMARY

[0003] The utility model aims at providing a compact sewage biological treatment system to solve the problem of large land occupation of the present sewage treatment plant.

[0004] The technical scheme of the utility model is: a compact sewage biological treatment system, comprising at least one sub-treatment unit, the sub-treatment unit comprises a total water distribution tank, a biological tank group, a water outlet channel and a nitrification liquid reflux tank, the biological tank group is provided with two groups and is symmetrically arranged side by side, and the biological tank group comprises pre-anoxic tanks, anaerobic tanks, anoxic tanks, aerobic tanks and post-aerobic tanks which are connected in sequence; the total water distribution tank is located in front of the two groups of biological tanks, and distribution water tanks are arranged on the two sides of the total water distribution tank; the two distribution water tanks are communicated with the two pre-anoxic tanks respectively; the water outlet channel is located behind the two groups of biological tanks, and the two post-aerobic tanks are communicated with the water outlet channel; the nitrification liquid reflux tank is arranged above the two post-aerobic tanks, the nitrification liquid reflux tank is connected with the post-aerobic tanks through a nitrification liquid lifting pump, and the nitrification liquid reflux tank is connected to the front end of the anoxic tank through a nitrification liquid reflux channel.

[0005] As a further improvement of the utility model, the nitrification liquid reflux channel is arranged along the upper sides of the aerobic tank and the anoxic tank, and the slope of the nitrification liquid reflux channel is towards the front end of the anoxic tank.

[0006] As a further improvement of the utility model, the distribution water tank is communicated with the pre-anoxic tank through a water distribution channel, and the water distribution channel is also communicated with the anaerobic tank and the anoxic tank.

[0007] As a further improvement of the utility model, the elevation of the water distribution channel is higher than that of the pre-anoxic tank and the anaerobic tank.

[0008] As a further improvement of the utility model, one of the back aerobic tanks is provided with a sludge backflow tank, the sludge backflow tank is connected with an inlet sludge pipe and an outlet sludge pipe, and the sludge backflow tank is connected to the anaerobic tank through a sludge backflow pump.

[0009] As a further improvement of the utility model, the anaerobic tank is connected with a vent pipe.

[0010] As a further improvement of the utility model, the anoxic tank is divided into multiple anoxic single tanks by a flow guide wall.

[0011] As a further improvement of the utility model, the aerobic tank is divided into multiple aerobic single tanks by a flow guide wall.

[0012] The utility model has the advantages of:

[0013] 1. The utility model adopts intensive structure layout, integrates different biological tanks of biological treatment process into a biological tank group in a compact arrangement form, two groups of biological tank groups share a total water distribution tank, a water outlet channel, a nitrification liquid backflow tank and a sludge backflow tank, thereby greatly saving the land area of the sewage biological treatment system, reducing the cost of infrastructure, avoiding the situation that the sewage treatment project is hindered due to site selection difficulties, avoiding the delay of the promotion of the new or reconstruction project of sewage treatment due to site selection limitations, and ensuring that the sewage in each region of the city can be treated in time.

[0014] 2. The utility model forms a modularized sub-treatment unit, and the sewage treatment plant can determine the number of sub-treatment units according to actual needs, and the overall structure is simple and clear.

[0015] 3. Under the condition of limited land area, the utility model utilizes symmetrical arrangement to reduce the design of the inlet tank and is beneficial to uniform distribution of the inlet water.

[0016] 4. The utility model arranges the nitrification liquid backflow system above the back aerobic tank, and the nitrification liquid backflows in a self-flowing manner through the inclined nitrification liquid backflow channel, thereby replacing the pump conveying mode and reducing energy consumption.

[0017] 5. The utility model utilizes the segmented inlet water mode of the water distribution channel to optimize the inlet water flow, maximally utilizes the carbon source in the inlet water, ensures the carbon source concentration of each section, and is beneficial to improving the nitrogen removal efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of the first embodiment of the utility model;

[0019] Figure 2 is an enlarged view of A part in Figure 1

[0020] Figure 3 ​It is the structural schematic view of the second embodiment of the utility model.

[0021] In the figure: 1 - total distribution pool;101 - total water inlet pipe;103 - distribution pool;104 - water inlet weir;105 - distribution channel;106 - first water inlet;107 - second water inlet;108 - third water inlet;2 - pre-anoxic tank;3 - anaerobic tank;4 - anoxic tank;401 - anoxic single pool;5 - aerobic tank;501 - aerobic single pool;6 - post-aerobic tank;7 - effluent channel;701 - effluent weir;704 - total effluent pipe;8 - nitration liquid reflux tank;801 - nitration liquid lifting pump;802 - nitration liquid reflux hole;803 - nitration liquid reflux channel;9 - sludge reflux tank;901 - sludge inlet pipe;902 - sludge reflux pump;903 - sludge outlet pipe;10 - vent pipe. DETAILED DESCRIPTION

[0022] The utility model will be explained in detail below in combination with the drawings.

[0023] Example 1,

[0024] As Figure 1 , Figure 2 shown, a compact sewage biological treatment system includes a sub-processing unit, the sub-processing unit includes total distribution pool 1, biological tank group, effluent channel 7 and nitration liquid reflux tank 8, and the biological tank group is provided with two groups and is symmetrically arranged side by side, and the biological tank group includes pre-anoxic tank 2, anaerobic tank 3, anoxic tank 4, aerobic tank 5 and post-aerobic tank 6 connected in turn;Total distribution pool 1 is located in front of the two groups of biological tank groups, and total distribution pool 1 is connected with total water inlet pipe 101, and total distribution pool 1 is provided with distribution pool 103 on both sides respectively, and two distribution pools 103 are communicated with two pre-anoxic tanks 2 respectively;Effluent channel 7 is located behind the two groups of biological tank groups, and effluent channel 7 is connected with total effluent pipe 704, and two post-aerobic tanks 6 are communicated with effluent channel 7;Nitration liquid reflux tank 8 is arranged above two post-aerobic tanks 6, and nitration liquid reflux tank 8 is connected with post-aerobic tank 6 through pipeline and nitration liquid lifting pump 801, and nitration liquid reflux tank 8 is connected to the front end of anoxic tank 4 through nitration liquid reflux channel 803.

[0025] Nitration liquid reflux channel 803 is arranged along the upper side of aerobic tank 5 and anoxic tank 4, and nitration liquid reflux channel 803 is sloped to the front end of anoxic tank 4 according to 3 ‰ slope.

[0026] Distribution pool 103 is communicated with pre-anoxic tank 2 through distribution channel 105, and distribution channel 105 is also communicated with anaerobic tank 3 and anoxic tank 4. Distribution channel 105 is connected with pre-anoxic tank 2, anaerobic tank 3 and anoxic tank 4 through first water inlet 106, second water inlet 107 and third water inlet 108 respectively.

[0027] The elevation of distribution channel 105 is higher than that of pre-anoxic tank 2 and anaerobic tank 3.

[0028] One of the post-aerobic tanks 6 is provided with a sludge return tank 9, the sludge return tank 9 is connected with an inlet pipe 901 and an outlet pipe 903, the sludge return tank 9 is connected to the anaerobic tank 3 through a pipeline and a sludge return pump 902.

[0029] The anaerobic tank 3 is connected with a vent pipe 10.

[0030] The anoxic tank 4 is divided into multiple anoxic single tanks 401 by a flow guide wall. In this embodiment, the anoxic single tank 401 is provided with 5 anoxic single tanks.

[0031] The aerobic tank 5 is divided into multiple aerobic single tanks 501 by a flow guide wall. In this embodiment, the aerobic single tank 501 is provided with 2 aerobic single tanks.

[0032] The sewage enters the total distribution tank 1 through the total inlet pipe 101, and then enters the two side distribution tanks 103 through the inlet weirs 104. After the sewage in the distribution tank 103 is distributed through the distribution channels 105, 0.2Q (Q is the design treatment capacity of the sewage) of the inlet water enters the pre-anoxic zone 2 together with the return sludge of the sludge return tank 9 through the first inlet port 106, the hydraulic retention time of the pre-anoxic zone 2 is 60.0 min, after treatment, the water flows around the flow guide wall and enters the anaerobic tank 3. At the same time, 0.4Q of the inlet water enters the anaerobic zone 3 through the second inlet port 107, the hydraulic retention time of the anaerobic zone 3 is 90.0 min, after treatment, the water flows around the flow guide wall and enters the anoxic tank 4. At the same time, 0.4Q of the inlet water enters the anoxic zone 4 through the third inlet port 108, the water flows around the flow guide wall under the action of the pusher, and sequentially passes through the 5 anoxic single tanks 401, the total hydraulic retention time of the anoxic zone 4 is 990.0 min. After treatment, the sewage flows around the flow guide wall and enters the aerobic zone 5, the water flows around the flow guide wall under the action of the pusher, and sequentially passes through the 2 aerobic single tanks 501, and then the water flows around the flow guide wall and enters the post-aerobic zone 6, the total hydraulic retention time of the aerobic zone 5 and the post-aerobic zone 6 is 745.0 min. The sewage entering the post-aerobic zone 6 flows through the outlet weirs 701 and enters the outlet zone 7, and finally is discharged through the total outlet pipe 704.

[0033] The nitrification liquid is lifted from the post-aerobic zone 6 to the nitrification liquid return tank 8 by the nitrification liquid lifting pump 801, the nitrification liquid enters the nitrification liquid return channel 803 through the nitrification liquid return hole 802, and then is returned to the first anoxic single tank 401 in a self-flowing manner through the nitrification liquid return channel 803. The nitrification liquid return amount is 3.0~4.0Q.

[0034] The sludge in the sludge return tank 9 is returned to the pre-anoxic zone 2 by the sludge return pump 902. The sludge return amount is 1.0Q. The inlet pipe 901 is connected with the front-end secondary sedimentation tank, the sludge of the secondary sedimentation tank is discharged into the sludge return tank 9 through the inlet pipe 901. The outlet pipe 903 is provided with a valve, when it is necessary to overhaul or other accidents, the valve is opened to discharge the sludge in the sludge return tank 9.

[0035] In this embodiment, the highest concentration of system water COD is 350 mg / L, the corresponding removal rate is 85.7%; the highest concentration of BOD is 260 mg / L, the corresponding removal rate is 96.2%; the highest concentration of SS is 250 mg / L, the corresponding removal rate is 96.0%; the highest concentration of TN is 85 mg / L, the corresponding removal rate is 82.4%; the highest concentration of ammonia nitrogen is 50 mg / L, the corresponding removal rate is 90.0%; the average concentration of TP is 3.7 mg / L, the corresponding removal rate is 86.5%.

[0036] Embodiment 2,

[0037] The difference between this embodiment and embodiment 1 is that two sub-processing units are provided, and the two sub-processing units are arranged symmetrically side by side, as shown in Figure 3 .

[0038] The utility model can efficiently remove the pollutants such as organic matter, ammonia nitrogen, total nitrogen and total phosphorus in the sewage, and has the advantages of saving floor area, low capital cost, high sewage treatment efficiency and the like.

Claims

1. A compact sewage biological treatment system, characterized by: The application relates to a sewage treatment device, which comprises at least one sub-processing unit, the sub-processing unit comprises a total distribution pool (1), a biological pool group, a water outlet channel (7) and a nitration liquid reflux pool (8), the biological pool group is provided with two groups and is symmetrically arranged side by side, the biological pool group comprises a pre-anoxic pool (2), an anaerobic pool (3), an anoxic pool (4), an aerobic pool (5) and a post-aerobic pool (6) which are sequentially connected, the total distribution pool (1) is located in front of the two groups of biological pool groups, distribution pools (103) are respectively arranged on the two sides of the total distribution pool (1), the two distribution pools (103) are respectively communicated with the two pre-anoxic pools (2), the water outlet channel (7) is located behind the two groups of biological pool groups, the two post-aerobic pools (6) are communicated with the water outlet channel (7), the nitration liquid reflux pool (8) is arranged above the two post-aerobic pools (6), the nitration liquid reflux pool (8) is connected with the post-aerobic pools (6) through a nitration liquid lifting pump (801), and the nitration liquid reflux pool (8) is connected to the front end of the anoxic pool (4) through a nitration liquid reflux channel (803).

2. A compact sewage biological treatment system according to claim 1, characterized in that: The nitration liquid reflux channel (803) is arranged above the aerobic pool (5) and the anoxic pool (4), and the nitration liquid reflux channel (803) is inclined to the front end of the anoxic pool (4).

3. A compact sewage biological treatment system according to claim 1 or 2, characterised in that: The distribution pool (103) is communicated with the pre-anoxic pool (2) through a distribution channel (105), and the distribution channel (105) is also communicated with the anaerobic pool (3) and the anoxic pool (4).

4. A compact sewage biological treatment system according to claim 3, wherein: The distribution channel (105) is higher in elevation than the pre-anoxic pool (2) and the anaerobic pool (3).

5. A compact sewage biological treatment system according to claim 4, wherein: One of the post-aerobic pools (6) is provided with a sludge reflux pool (9) behind the post-aerobic pool (6), the sludge reflux pool (9) is connected with a sludge inlet pipe (901) and a sludge outlet pipe (903), and the sludge reflux pool (9) is connected to the anaerobic pool (3) through a sludge reflux pump (902).

6. A compact sewage biological treatment system according to claim 5, wherein: The anaerobic pool (3) is connected with a vent pipe (10).

7. A compact sewage biological treatment system according to claim 6, characterised in that: The anoxic pool (4) is divided into a plurality of anoxic single pools (401) by a flow guide wall.

8. A compact sewage biological treatment system according to claim 7, characterised in that: The aerobic pool (5) is divided into a plurality of aerobic single pools (501) by a flow guide wall.

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