Sewage treatment device

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment device. Comprising an anaerobic tank, a front anoxic tank, an aerobic tank, a rear anoxic tank and an MBR separation tank which are sequentially communicated, the MBR separation tank comprises a water inlet tank, an MBR membrane tank and a sludge tank which are communicated in sequence, the MBR membrane tank is provided with a plurality of MBR membrane groups, an inclined plate tube module for filtering and separating is arranged in the water inlet tank, and the water inlet tank is communicated with the rear anoxic tank. According to the utility model, the inclined plate tube module is arranged in the water inlet tank, and sludge mixed liquid flows through the inclined plate tube module and then is subjected to membrane filtration treatment through the MBR membrane tank; through the arrangement of the inclined plate pipe module, a part of sludge and suspended solids can be effectively deposited, and the suspended solids in a mixed solution are reduced, so that the subsequent adding efficiency of an aluminum sulfate medicament is improved, the total phosphorus content of effluent is reduced, and meanwhile, the cost can also be reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment, and more specifically, to a wastewater treatment device. Background Technology

[0002] With water pollution worsening and water quality becoming increasingly complex and variable, addressing point source and non-point source pollution has become a key focus of water environmental protection. This is especially true for small, dispersed pollution sources that are difficult to collect, necessitating mobile treatment devices. Among biological treatment technologies, the activated sludge process and its derivatives hold an indispensable position. Of these, MBR (Membrane Bioreactor) and oxidation ditch are currently among the most important biological wastewater treatment processes.

[0003] Membrane bioreactors (MBRs) are a treatment technology that combines biological treatment and membrane separation. MBRs offer advantages such as good solid-liquid separation, low residual activated sludge volume (high sludge concentration, long sludge age), no need for secondary sedimentation tanks, better effluent quality, and small footprint, making them an indispensable technology in current water treatment. In the sludge-water separation stage of wastewater treatment, the phosphorus removal efficiency of MBR processes is generally slightly lower than that of processes using secondary sedimentation tanks. Therefore, it is necessary to add chemicals (using aluminum sulfate flocculants) to improve the phosphorus removal efficiency of the MBR membrane tank and reduce the total phosphorus in the effluent. However, the effectiveness of flocculants is affected by suspended solids; that is, if the MLSS concentration in the sludge-water mixture is too high, it affects the phosphorus removal efficiency of the added phosphorus removal agent, leading to increased chemical consumption. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing MBR membrane tank phosphorus removal flocculants, which affect the phosphorus removal effect and lead to high chemical consumption, and to provide a wastewater treatment device that effectively reduces suspended solids in sludge mixed liquor.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A wastewater treatment device is provided, comprising an anaerobic tank, a pre-anoxic tank, an aerobic tank, a post-anoxic tank, and an MBR separation tank connected in sequence; the MBR separation tank includes an inlet tank, an MBR membrane tank equipped with multiple sets of MBR membrane modules, and a sludge tank connected in sequence, wherein an inclined plate tube module for filtration and separation is provided in the inlet tank, and the inlet tank is connected to the post-anoxic tank.

[0007] This utility model discloses a wastewater treatment device in which sludge mixed liquor is sequentially treated in an anaerobic tank, a pre-anoxic tank, an aerobic tank, and a post-anoxic tank before entering an MBR separation tank. This utility model uses inclined plate tube modules installed in the influent tank. After the sludge mixed liquor flows through the inclined plate tube modules, it undergoes membrane filtration treatment in the MBR membrane tank. The inclined plate tube modules can effectively deposit some sludge and suspended solids, reducing the suspended solids in the mixed liquor, thereby improving the subsequent aluminum sulfate reagent dosing efficiency, reducing the total phosphorus content in the effluent, and also reducing costs.

[0008] Furthermore, a gap is provided between the bottom end of the inclined plate tube module and the bottom of the inlet tank. After the sludge mixture flows through the inclined plate tube module, because the inclined plate tube module is set at an angle, the deposited sludge and suspended solids will slide down the pipe and finally settle at the bottom of the inlet tank. The gap between the inclined plate tube module and the bottom of the inlet tank can prevent the deposited sludge and suspended solids from accumulating at the bottom end of the inclined plate tube, thereby preventing blockage.

[0009] Furthermore, the inclined plate tube module is located in the middle of the influent tank. The lower part of the influent tank is connected to the post-anoxic tank, and the upper part of the influent tank is connected to the MBR membrane tank. Water enters the influent tank from the bottom and exits from the top. The sludge mixture, as well as the deposited sludge and suspended solids, are located in the lower part of the influent tank. The liquid obtained after filtration and separation by the inclined plate tube module is located in the upper part of the influent tank. Through this arrangement, the concentration of sludge and suspended solids entering the MBR membrane tank can be effectively reduced.

[0010] Furthermore, the lower part of the water inlet pool is provided with an inlet valve, the upper part of the water inlet pool is provided with an outlet valve, and the installation height of the inlet valve is lower than the installation height of the outlet valve.

[0011] Furthermore, the influent tank comprises, from bottom to top, a sludge layer, a mixed liquor layer, a filter layer, and a supernatant layer; the influent valve is located in the mixed liquor layer, the inclined plate tube module is located in the filter layer, and the effluent valve is located in the supernatant layer. The sludge and suspended solids separated by the inclined plate tube module are deposited in the sludge layer, i.e., at the bottom of the influent tank; the sludge-mixed liquor flowing in from the post-anoxic tank is in the mixed liquor layer. The continuous inflow of the sludge-mixed liquor causes it to continuously flow upwards through the inclined plate tube module, achieving filtration and separation; the resulting supernatant is concentrated in the supernatant layer, and the effluent valve is located in the supernatant layer, thereby ensuring that the liquid flowing through the MBR membrane tank is the liquid filtered by the inclined plate tube module, reducing the concentration of sludge and suspended solids in the MBR membrane tank.

[0012] Furthermore, the aerobic tank is equipped with an aerobic return pipe connected to the pre-anoxic tank; the post-anoxic tank is equipped with a post-anoxic return pipe connected to the anaerobic tank. A portion of the sludge mixture in the aerobic tank flows into the post-anoxic tank, and a portion flows back to the anoxic tank through the aerobic return pipe; a portion of the sludge mixture in the post-anoxic tank flows into the MBR separation tank, and a portion flows back to the anaerobic tank through the post-anoxic return pipe.

[0013] Furthermore, the influent tank is equipped with a sediment flow pipeline connected to the sludge tank; the sludge tank is equipped with a sludge return pipeline connected to the aerobic tank. After filtration by the inclined plate tube module in the influent tank, some sludge will settle at the bottom. The sludge settled at the bottom of the influent tank is discharged into the sludge tank through the sediment flow pipeline. The sludge obtained after separation by the MBR membrane tank is also discharged into the sludge tank for joint treatment of sediments. In addition, the sludge mixture in the sludge tank is returned to the aerobic tank through the sludge return pipeline for secondary treatment, ensuring treatment efficiency and reducing harmful substances in the sludge.

[0014] Furthermore, the inclined plate tube module includes multiple inclined tubes, which are parallel to each other and arranged closely to form the plate tube module. The multiple inclined tubes are arranged closely together, and gaps between the inclined tubes are avoided as much as possible to ensure that the sludge mixture flows out from the inside of the inclined tubes.

[0015] Furthermore, the inclination angle θ between the inclined tube and the horizontal plane is 45° to 75°; the inner diameter of the inclined tube is 25mm to 50mm. Setting the inclination angle of the inclined tube to 45° to 75° ensures good deposition effect and also prevents deposits from clogging the pipe.

[0016] Furthermore, the interior of the inclined tube is a smooth circular tube, while the exterior of the inclined tube has a regular hexagonal structure. The smooth circular interior of the inclined tube can prevent sludge from remaining inside the pipe, ensuring that the deposited sludge can slide down the pipe and fall to the bottom of the inlet pool; the regular hexagonal exterior of the pipe facilitates a tight connection between the inclined tubes.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This utility model discloses a wastewater treatment device that, through the installation of inclined plate tube modules in the influent tank, can effectively deposit a portion of sludge and suspended solids, reduce the suspended solids in the mixed liquor, lower the suspended solids concentration in the sludge mixed liquor in the MBR membrane tank, thereby improving the subsequent dosing efficiency of aluminum sulfate reagent, thus reducing the total phosphorus content in the effluent, and also reducing costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the wastewater treatment device of this utility model. The arrows in the diagram indicate the flow direction of the sludge mixture.

[0020] Figure 2 This is a schematic diagram of the MBR separation tank structure of this utility model; in the figure, T represents a valve and M represents a pump.

[0021] Figure 3 This is a schematic diagram of the water inlet tank structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the inclined plate tube module of this utility model.

[0023] In the attached diagram: 1. Anaerobic tank; 2. Pre-anoxic tank; 3. Aerobic tank; 4. Post-anoxic tank; 5. MBR separation tank; 6. Inclined plate tube module; 7. Inlet tank; 8. MBR membrane tank; 9. Sludge tank; 10. Aerobic return pipeline; 11. Post-anoxic return pipeline; 12. Sludge return pipeline; 13. Sediment flow pipeline; 14. Inlet valve; 15. Outlet valve. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] Example 1

[0027] This embodiment is a first embodiment of a wastewater treatment device, including an anaerobic tank 1, a pre-anoxic tank 2, an aerobic tank 3, a post-anoxic tank 4, and an MBR separation tank 5 connected in sequence. The MBR separation tank 5 includes an inlet tank 7, an MBR membrane tank 8 equipped with multiple sets of MBR membrane modules, and a sludge tank 9 connected in sequence. An inclined plate tube module 6 for filtration and separation is provided in the inlet tank 7, and the inlet tank 7 is connected to the post-anoxic tank 4.

[0028] In this embodiment, a gap is provided between the bottom end of the inclined plate tube module 6 and the bottom of the inlet tank 7. After the sludge mixture flows through the inclined plate tube module 6, since the inclined plate tube module 6 is inclined, the deposited sludge and suspended solids will slide down the pipe and finally settle at the bottom of the inlet tank 7. The gap between the inclined plate tube module 6 and the bottom of the inlet tank 7 can prevent the deposited sludge and suspended solids from accumulating at the bottom end of the inclined plate tube, thereby preventing blockage.

[0029] In this embodiment, the inclined plate tube module 6 is located in the middle of the inlet tank 7. The lower part of the inlet tank 7 is connected to the post-anoxic tank 4, and the upper part of the inlet tank 7 is connected to the MBR membrane tank 8. Water enters the inlet tank 7 from the bottom and exits from the top. The sludge mixture, as well as the deposited sludge and suspended solids, are located in the lower part of the inlet tank 7. The liquid obtained after filtration and separation by the inclined plate tube module 6 is located in the upper part of the inlet tank 7. Through the above arrangement, the concentration of sludge and suspended solids entering the MBR membrane tank 8 can be effectively reduced.

[0030] In this embodiment, the lower part of the water inlet pool 7 is provided with a water inlet valve 14, the upper part of the water inlet pool 7 is provided with a water outlet valve 15, and the installation height of the water inlet valve 14 is lower than the installation height of the water outlet valve 15.

[0031] In this embodiment, the influent tank 7 includes, from bottom to top, a sludge layer, a mixed liquor layer, a filter layer, and a supernatant layer; the influent valve 14 is located in the mixed liquor layer, the inclined plate tube module 6 is located in the filter layer, and the effluent valve 15 is located in the supernatant layer. The sludge and suspended solids separated by the inclined plate tube module 6 are deposited in the sludge layer, which is located at the bottom of the influent tank 7; the sludge mixed liquor flowing in from the post-anoxic tank 4 is located in the mixed liquor layer, and the sludge mixed liquor continuously flows in, causing the sludge mixed liquor to continuously flow upward through the inclined plate tube module 6, achieving filtration and separation; the obtained supernatant is concentrated in the supernatant layer, and the effluent valve is located in the supernatant layer, thereby ensuring that the liquid flowing through the MBR membrane tank 8 is the liquid filtered by the inclined plate tube module 6, reducing the concentration of sludge suspended solids in the MBR membrane tank 8.

[0032] This utility model discloses a wastewater treatment device in which sludge mixed liquor is sequentially treated through an anaerobic tank 1, a pre-anoxic tank 2, an aerobic tank 3, and a post-anoxic tank 4 before entering an MBR separation tank 5. This utility model incorporates inclined plate tube modules 6 in the influent tank 7. After flowing through these modules, the sludge mixed liquor undergoes membrane filtration treatment in an MBR membrane tank 8. The inclined plate tube modules 6 effectively deposit some sludge and suspended solids, reducing the suspended solids in the mixed liquor and thus improving the subsequent dosing efficiency of aluminum sulfate reagent, thereby reducing the total phosphorus content in the effluent and lowering costs.

[0033] Example 2

[0034] This embodiment is a second embodiment of a wastewater treatment device. This embodiment is similar to the first embodiment, except that in this embodiment, the aerobic tank 3 is equipped with an aerobic return pipe 10 connected to the pre-anoxic tank 2; the post-anoxic tank 4 is equipped with a post-anoxic return pipe 11 connected to the anaerobic tank 1. Part of the sludge mixture in the aerobic tank 3 flows into the post-anoxic tank 4, and part flows back to the anoxic tank through the aerobic return pipe 10; part of the sludge mixture in the post-anoxic tank 4 flows into the MBR separation tank 5, and part flows back to the anaerobic tank 1 through the post-anoxic return pipe 11. The influent tank 7 is equipped with a sediment flow pipe 13 connected to the sludge tank 9; the sludge tank 9 is equipped with a sludge return pipe 12 connected to the aerobic tank 3. After filtration by the inclined plate tube module 6 in the inlet tank 7, some sludge will be deposited at the bottom. The sludge deposited at the bottom of the inlet tank 7 is discharged into the sludge tank 9 through the sedimentation flow pipe 13. The sludge separated by the MBR membrane tank 8 is also discharged into the sludge tank 9 for easy treatment of the sediment. In addition, the sludge mixture in the sludge tank 9 is returned to the aerobic tank 3 through the sludge return pipe 12 for secondary treatment to ensure treatment efficiency and reduce harmful substances in the sludge.

[0035] Example 3

[0036] This embodiment is a third embodiment of a wastewater treatment device. It is similar to Embodiment 1, except that in this embodiment, the inclined plate tube module 6 includes multiple inclined tubes arranged parallel to each other and closely to form the plate tube module. The multiple inclined tubes are arranged closely together, with gaps between them as little as possible, to ensure that the sludge mixture flows out entirely from inside the inclined tubes.

[0037] In this embodiment, the inclination angle θ between the inclined tube and the horizontal plane is 45° to 75°; the inner diameter of the inclined tube is 25mm to 50mm. Setting the inclination angle of the inclined tube to 45° to 75° ensures good deposition effect and also prevents deposits from clogging the pipe.

[0038] In this embodiment, the inside of the inclined tube is a smooth circular tube, while the outside of the inclined tube has a regular hexagonal structure. The smooth circular tube inside the inclined tube can prevent sludge from remaining inside the pipe and ensure that the deposited sludge can slide down the pipe and fall into the bottom of the inlet pool 7; the regular hexagonal shape of the pipe facilitates a tight connection between the inclined tubes.

[0039] In summary, the wastewater treatment device of this utility model, through the setting of the inclined plate tube module 6 in the inlet tank 7, can effectively deposit a portion of sludge and suspended solids, reduce the suspended solids in the mixed liquor, lower the suspended solids concentration in the sludge mixed liquor in the MBR membrane tank 8, thereby improving the subsequent aluminum sulfate reagent dosing efficiency, thus reducing the total phosphorus content in the effluent, and also reducing costs.

[0040] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A wastewater treatment device, comprising an anaerobic tank (1), a pre-anoxic tank (2), an aerobic tank (3), a post-anoxic tank (4), and an MBR separation tank (5) connected in sequence; characterized in that, The MBR separation tank (5) includes an inlet tank (7) connected in sequence, an MBR membrane tank (8) equipped with multiple sets of MBR membrane modules, and a sludge tank (9). An inclined plate tube module (6) for filtration and separation is provided in the inlet tank (7). The inlet tank (7) is connected to the post-anoxic tank (4).

2. The wastewater treatment device according to claim 1, characterized in that, There is a gap between the bottom end of the inclined plate tube module (6) and the bottom of the water inlet pool (7).

3. The wastewater treatment device according to claim 2, characterized in that, The inclined plate tube module (6) is located in the middle of the inlet pool (7), the lower part of the inlet pool (7) is connected to the post-anoxic pool (4), and the upper part of the inlet pool (7) is connected to the MBR membrane pool (8).

4. The wastewater treatment device according to claim 3, characterized in that, The lower part of the water inlet pool (7) is provided with a water inlet valve (14), and the upper part of the water inlet pool (7) is provided with a water outlet valve (15), and the installation height of the water inlet valve (14) is lower than the installation height of the water outlet valve (15).

5. The wastewater treatment device according to claim 4, characterized in that, The inlet pool (7) includes a sedimentation layer, a mixed liquid layer, a filter layer and a supernatant layer from bottom to top; the inlet valve (14) is located in the mixed liquid layer, the inclined plate tube module (6) is located in the filter layer, and the outlet valve (15) is located in the supernatant layer.

6. The wastewater treatment device according to claim 5, characterized in that, The aerobic tank (3) is provided with an aerobic return pipe (10) connected to the pre-anoxic tank (2); the post-anoxic tank (4) is provided with a post-anoxic return pipe (11) connected to the anaerobic tank (1).

7. The wastewater treatment device according to claim 6, characterized in that, The inlet pool (7) is provided with a sediment flow pipeline (13) connected to the sludge pool (9); the sludge pool (9) is provided with a sludge return pipeline (12) connected to the aerobic pool (3).

8. The wastewater treatment apparatus according to any one of claims 1 to 7, characterized in that, The inclined plate tube module (6) includes multiple inclined tubes, which are parallel to each other and arranged closely to form the plate tube module.

9. The wastewater treatment apparatus according to claim 8, characterized in that, The angle of inclination θ between the inclined tube and the horizontal plane is 45° to 75°; the inner diameter of the inclined tube is 25mm to 50mm.

10. The wastewater treatment apparatus according to claim 8, characterized in that, The inside of the inclined tube is a smooth circular tube, and the outside of the inclined tube has a regular hexagonal structure.

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