Storage pond sewage treatment system coupled with modularized sewage treatment device

Abstract

The utility model discloses a regulation and storage tank sewage treatment system coupled with a modularized sewage treatment device, and relates to the technical field of sewage treatment. The sewage treatment system comprises a regulation and storage area and a biochemical treatment area which are sequentially connected, one or more modular sewage treatment devices are arranged in the biochemical treatment area, and sewage in the regulation and storage area enters the biochemical treatment area to be subjected to biochemical treatment and then is discharged. According to the utility model, the existing rainwater regulation and storage facility can be fully utilized, and the biochemical treatment area provided with a plurality of modularized sewage treatment devices is additionally arranged, so that the sewage biochemical treatment function is added while the regulation and storage function of the original rainwater regulation and storage facility is reserved, domestic sewage can be treated in dry seasons, and domestic sewage and rainwater can be treated in rainy seasons at the same time; the influence of pollutants such as organic matters, ammonia nitrogen and the like in the sewage on a receiving water body is reduced, the in-situ efficient treatment of combined rainwater and sewage mixed drainage or separated initial rainwater is realized to reach the standard for discharge, the treatment pressure of a sewage plant is reduced, and the problem of urban non-point source pollution caused by overflow in rainy days of a drainage system can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a storage tank sewage treatment system coupled with a modular sewage treatment device. Background Art

[0002] With the continuous improvement of urbanization, the amount of domestic sewage and rainwater runoff has increased, and the overflow pollution of the combined system rainwater and sewage mixed drainage and the initial rainwater runoff pollution of the separate system in the urban drainage network have become increasingly serious. The main way to deal with the existing overflow pollution problem is to build a storage tank at the end of the drainage system to collect and store the initial rainwater or rainwater and sewage mixed drainage during the peak rainfall period. After the peak period has passed, the sewage in the storage tank is transported to the existing sewage treatment plant or the newly built sewage treatment facility for treatment and finally discharged.

[0003] However, this treatment method has the following problems: (1) Most of the storage facilities are built far away from the urban sewage treatment plant. It is necessary to lay a pipeline network to transfer the sewage from the storage tank to the existing sewage treatment plant. The laying of the pipeline network is long, the initial investment is large, and the maintenance cost of the pipeline network is high in the later stage. In addition, the initial rainwater is input into the existing sewage treatment plant, which reduces the influent concentration of the sewage treatment plant and increases the influent volume, causing a large impact on the water quality and quantity of the sewage treatment plant, which is not conducive to the stable operation of the sewage treatment plant. (2) At present, the new sewage treatment facilities at the back of the storage tank usually adopt physical and chemical treatment methods, such as coagulation and sedimentation process, to remove suspended solids (SS) and a small amount of organic matter in the sewage, but the effect of reducing dissolved pollutants such as ammonia nitrogen is not obvious. Pollutants such as ammonia nitrogen have a great impact on the water quality section, which is an important reason for the "return to black and odor" of the water body. (3) Solving the overflow pollution problem requires meeting the conditions of treating a large amount of sewage in a short period of time and intermittent operation. It is also necessary to consider the feasibility and economic efficiency of the technical process and the enthusiasm for investment and operation. Utility Model Content

[0004] In view of the deficiencies of the above-mentioned prior art, the utility model provides a regulating reservoir sewage treatment system coupled with a modular sewage treatment device. By combining the regulating reservoir with a biochemical treatment facility, it can achieve effective reduction of pollutants in the system's overflow sewage during the rainy season and economical long-term operation of the system's technical process.

[0005] In order to solve the above problems, the utility model proposes the following technical solutions:

[0006] A sewage treatment system for a regulating reservoir coupled with modular sewage treatment devices, comprising a regulating reservoir area and a biochemical treatment area connected in sequence according to a water flow direction, wherein one or more modular sewage treatment devices are arranged in the biochemical treatment area, and sewage in the regulating reservoir area enters the biochemical treatment area for biochemical treatment and then is discharged; the modular sewage treatment device is a circulating clarifier or a fixed-bed biofilm module; the circulating clarifier comprises a container body, a sedimentation chamber and an overflow trough, the sedimentation chamber is located in the container body, and the overflow trough is located above the sedimentation chamber; the fixed-bed biofilm module comprises a module skeleton, a support rod and a plurality of biofilm fillers, the biofilm fillers are of a sheet structure or a honeycomb structure, the biofilm fillers are suspended and fixed on the module skeleton by support rods, and air-water channels are formed between adjacent biofilm fillers.

[0007] It can be understood that in the present invention, the regulating and storing area is used to store initial rainwater or mixed rainwater and sewage drainage, which is an existing regulating and storing facility.

[0008] Furthermore, one or more aeration devices are provided at the bottom of the biochemical treatment area, and the aeration device is located below the modular sewage treatment device.

[0009] For example, when a circulating clarifier is used for biochemical treatment, the circulating clarifier is suspended and installed in the biochemical treatment area. An aeration device is provided at the bottom of the biochemical treatment area. The circulating clarifier uses the air lift power generated by the aeration device at the bottom to generate a circulation of the mixed liquid, thereby realizing the integration of reaction and precipitation and unpowered sludge return in the biochemical treatment area.

[0010] For example, when a fixed bed biofilm module is used for biochemical treatment, an aeration device is set at the bottom of the biochemical treatment area. Specifically, an aeration device can be set at the bottom of the fixed bed biofilm module skeleton. The aeration device is connected to the module skeleton. The aeration device allows the sewage to form a longitudinal circulation around the biological filler, which is fully in contact with the microorganisms on the surface of the filler.

[0011] It should be noted that in the present invention, the module skeleton of the fixed bed biofilm module is not provided with baffles around and above and below, and each contact surface between the fixed bed biofilm modules can be interconnected, which is conducive to upflow and downflow, sufficient contact of the mixture, and enhanced reaction efficiency. Furthermore, a plurality of the fixed bed biofilm modules are flatly laid and / or stacked up and down and spread throughout the biochemical treatment area.

[0012] Furthermore, in the utility model, the sheet-like biofilm filler is provided with mounting holes, and the plurality of support rods sequentially pass through the mounting holes of the sheet-like biofilm filler so that the sheet-like biofilm filler is suspended and fixed on the module frame in parallel.

[0013] Furthermore, the biofilm filler is attached with functional bacteria that are directed towards domestication of target pollutants (COD, ammonia nitrogen).

[0014] Furthermore, a floating island is arranged on the top of the fixed bed biofilm module skeleton, and cultivation holes are added on the floating island to plant aquatic plants to create a landscape effect.

[0015] Furthermore, the biofilm filler material is one or more of polyester fiber, polypropylene, polyethylene, and polyurethane.

[0016] Furthermore, the storage area and the biochemical treatment area are located in the same pool body, and are separated into independent spaces by partitions or walls. In the storage pool sewage treatment system of the utility model, the storage area and the biochemical treatment area are coupled in a pool body, which is called a biochemical storage pool. The storage area and the biochemical treatment area in the biochemical storage pool are divided and separated by partitions or walls. It should be noted that the biochemical storage pool is obtained by transforming the existing rainwater storage facilities and adding a biochemical treatment area inside the existing pool body. The biochemical storage pool has both storage and biochemical treatment functions, and the sewage is discharged on site after treatment.

[0017] Furthermore, the storage area and the biochemical treatment area are two independent pools, respectively called the storage pool and the biochemical treatment pool. The storage pool is an existing rainwater storage facility, and the biochemical treatment pool is arranged above the storage pool. In the storage pool sewage treatment system of the utility model, the storage pool is an existing rainwater storage facility, and the biochemical treatment pool is a newly added biochemical treatment facility. On the premise of not increasing new land, based on the existing rainwater storage facility, a new biochemical treatment pool is added above the storage pool to form a sewage treatment system, which helps to ensure that the sewage in the storage pool is discharged on site after biochemical treatment.

[0018] Furthermore, the water inlet end of the regulating and storage area is also connected to a water inlet area, and the sewage converges in the water inlet area and then enters the regulating and storage area.

[0019] Specifically, the water inlet area is arranged at the front end of the regulating and storing tank or the biochemical regulating and storing tank, connected to the combined sewage pipe and the rainwater pipe to collect the mixed rainwater and sewage; or only connected to the rainwater pipe to collect the initial rainwater. The water inlet area can be an interception well.

[0020] Furthermore, a pretreatment area is connected between the storage area and the biochemical treatment area. The sewage in the storage area first enters the pretreatment area for pretreatment and then enters the biochemical treatment area for biochemical treatment.

[0021] Specifically, the pretreatment area can be arranged above the storage tank, or above or inside the biochemical storage tank. The specific location is not particularly limited and can be adjusted according to the treatment process and actual site and space design requirements. The pretreatment area can be a grid well and / or a grit chamber.

[0022] Furthermore, the drainage end of the biochemical treatment area is also connected to a deep treatment area, and the sewage is discharged into the deep treatment area after being biochemically treated in the biochemical treatment area.

[0023] Specifically, the deep treatment area can be arranged above the storage tank, or above or inside the biochemical storage tank. The specific location is not particularly limited and can be adjusted according to the treatment process and the actual site and space design requirements. The deep treatment area can be a coagulation sedimentation tank and / or a filtration tank.

[0024] Furthermore, in other schemes, the sewage treatment system of the regulating and storing tank coupled with the modular sewage treatment device also includes an inlet area, a pretreatment area and a deep treatment area; which are sequentially connected as the inlet area, the regulating and storing area, the pretreatment area, the biochemical treatment area and the deep treatment area. The working principle of this sewage treatment system is described as follows: when the inlet area is connected to the combined sewer pipe and the rainwater pipe, in the dry season, there is no water in the regulating and storing area, and the domestic sewage in the inlet area is directly pumped into the pretreatment area for pretreatment, and then enters the biochemical treatment area, and finally enters the deep treatment area after biochemical treatment; in the rainy season, the sewage is discharged after being treated in the inlet area, the regulating and storing area, the pretreatment area, the biochemical treatment area and the deep treatment area in sequence.

[0025] Furthermore, in other schemes, the regulating and storage tank sewage treatment system coupled with the modular sewage treatment device also includes an inlet area and a deep treatment area; which are sequentially connected as an inlet area, a regulating and storage area, a biochemical treatment area, and a deep treatment area. The working principle of this sewage treatment system is described as follows: when the inlet area is connected to the combined sewer pipe and the rainwater pipe, in the dry season, there is no water in the regulating and storage area, and the domestic sewage in the inlet area is directly pumped into the biochemical treatment area, and finally enters the deep treatment area after biochemical treatment; in the rainy season, the sewage is discharged after being treated in the inlet area, the regulating and storage area, the biochemical treatment area, and the deep treatment area in turn.

[0026] Furthermore, in other schemes, the regulating and storing tank sewage treatment system coupled with the modular sewage treatment device also includes a pretreatment area and a deep treatment area; which are sequentially connected as the regulating and storing area, the pretreatment area, the biochemical treatment area, and the deep treatment area. The working principle of this sewage treatment system is described as follows: during the rainy season, the sewage in the regulating and storing area is directly pumped into the pretreatment area for pretreatment, and then enters the biochemical treatment area, and finally enters the deep treatment area after biochemical treatment. During the dry season, there is no water in the regulating and storing area, and the sewage treatment system may stop operating. Therefore, in order to make full use of the sewage treatment system, it is usually connected to the water inlet area to treat domestic sewage.

[0027] It can be understood that in the regulating tank sewage treatment system coupled with the modular sewage treatment device, the connection between the treatment areas refers to a connection method for guiding the flow of sewage, which can be a pipeline connection, a channel connection, or the like in a specific implementation.

[0028] Compared with the prior art, the technical effects that can be achieved by the utility model include:

[0029] (1) The storage tank sewage treatment system coupled with modular sewage treatment devices provided by the utility model can make full use of existing rainwater storage facilities. By adding biochemical treatment areas of multiple modular sewage treatment devices inside or outside the existing rainwater storage facilities, the original rainwater storage facilities retain the storage function while adding sewage biochemical treatment function. The technical solution provided by the utility model can treat conventional domestic sewage in the dry season and treat domestic sewage and rainwater at the same time in the rainy season, reducing the impact of pollutants such as organic matter and ammonia nitrogen in sewage on the receiving water body, and realizing the in-situ efficient treatment of combined rainwater and sewage mixed drainage or initial rainwater in the diversion system until it meets the discharge standards. The effluent can be directly supplied to nearby waters, significantly reducing the treatment pressure of other sewage treatment plants within the basin, while saving the construction and maintenance costs of the pipeline network transporting to the sewage treatment plant, and can effectively solve the problem of urban non-point source pollution caused by overflow of the drainage system on rainy days.

[0030] (2) The technical solution provided by the utility model does not require additional land, occupies a small area, and saves investment; at the same time, the modular sewage treatment device adopts a modular and standardized design, which is flexible in application, easy to install, has low construction cost, and short construction period.

[0031] (3) The technical solution provided by the utility model can solve the problem that microorganisms cannot survive in conventional rainwater storage tank sewage treatment facilities due to lack of water available during the dry season.

[0032] (4) The modular sewage treatment device used in the technical solution provided by the utility model for biochemical treatment has strong impact load resistance and large water flux. The fixed bed biofilm module has no baffles around and above and below, which saves economic costs compared to the box-type biochemical treatment module. At the same time, the contact surfaces between the fixed bed biofilm modules are interconnected, which is conducive to the full contact between the mixed liquid upflow and downflow, strengthening the mass transfer effect and improving the sewage treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram of the main structure of a storage tank sewage treatment system coupled with a fixed-bed biofilm module provided in Example 1 of the utility model;

[0035] Figure 2A schematic diagram of the structure and flow of a sewage treatment system for a storage tank coupled with a fixed-bed biofilm module provided in Example 1 of the utility model;

[0036] Figure 3 A schematic structural diagram of a fixed bed biofilm module of a storage tank sewage treatment system coupled with a fixed bed biofilm module provided in Example 1 of the utility model;

[0037] Figure 4 A schematic diagram of the main structure of a storage tank sewage treatment system coupled with a circulating clarifier provided in Example 2 of the utility model;

[0038] Figure 5 A schematic diagram of the main structure of the biochemical treatment area of ​​the storage tank sewage treatment system coupled with the circulating clarifier provided in Example 2 of the utility model;

[0039] Figure 6 A schematic diagram of the structure of a circulating clarifier of a storage tank sewage treatment system coupled with a circulating clarifier provided in Example 2 of the utility model.

[0040] Reference numerals

[0041] Inlet area 1, regulating and storing area 2, pretreatment area 3, biochemical treatment area 4, deep treatment area 5, biochemical regulating and storing tank 6, regulating and storing tank 8 and biochemical treatment tank 9;

[0042] Partition wall 61, permeable wall 62, water outlet lifting pump 63;

[0043] Sewage pipe 11, rainwater pipe 12, first pipe 71, second pipe 72, third pipe 73, fourth pipe 74, fifth pipe 75, sixth pipe 76;

[0044] Fixed bed biofilm module 41, biofilm filler 411, support rod 412, module frame 413, first aeration device 414, floating island 415;

[0045] Circulation clarifier 42 , container body 421 , sedimentation chamber 422 , overflow tank 423 , second aeration device 43 . DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments to be described below are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0047] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0048] It should also be understood that the terms used in this utility model embodiment specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model embodiments. As used in the utility model embodiment specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0049] Example 1

[0050] like Figure 1 to Figure 3 As shown, this embodiment provides a sewage treatment system for a regulating reservoir coupled with a fixed-bed biofilm module, including an inlet area 1, a regulating reservoir area 2, a pretreatment area 3, a biochemical treatment area 4 and a deep treatment area 5, and the sewage pipes are connected in the order of the inlet area 1, the regulating reservoir area 2, the pretreatment area 3, the biochemical treatment area 4 and the deep treatment area 5. A plurality of fixed-bed biofilm modules 41 are arranged in the biochemical treatment area 4, and the fixed-bed biofilm modules 41 include biofilm fillers 411, support rods 412 and module skeletons 413. The biofilm fillers 411 are in the form of sheets and are suspended and fixed on the module skeletons 413 by support rods 412. No baffles are arranged around and on the upper and lower surfaces of the module skeletons 413, and each contact surface between the plurality of fixed-bed biofilm modules 41 can be interconnected.

[0051] Furthermore, in this embodiment, the storage area 2 and the biochemical treatment area 4 are coupled in a pool body, which is called a biochemical storage pool 6. The storage area 2 and the biochemical treatment area 4 in the biochemical storage pool 6 are divided and separated by a partition wall 61. It should be noted that the biochemical storage pool 6 is obtained by transforming the existing rainwater storage facilities and adding the biochemical treatment area 4 inside. The biochemical storage pool 6 has both storage and biochemical treatment functions.

[0052] Furthermore, in this embodiment, the water inlet area 1 is in the form of an intercepting well, which is arranged at the front end of the biochemical storage tank 6, connected to the combined sewer pipe 11 and the rainwater pipe 12, and collects mixed rainwater and sewage drainage.

[0053] Furthermore, in this embodiment, the pretreatment area 3 is in the form of a grid and is arranged inside the biochemical storage tank 6. The pretreatment area 3 and the storage area 2 are separated by a permeable wall 62. A water outlet lift pump 63 is provided at the rear end of the pretreatment area 3 to pump the pretreated sewage into the biochemical treatment area 4 through the lift pump.

[0054] Furthermore, the deep treatment zone 5 is in the form of a magnetic microfiltration integrated machine, and is arranged above the biochemical storage tank 6.

[0055] Furthermore, the fixed bed biofilm modules 41 are laid flat and stacked up and down to cover the entire biochemical treatment area 4 .

[0056] Furthermore, in this embodiment, a first aeration device 414 may be provided at the bottom of the fixed bed biofilm module skeleton 413. The first aeration device 414 allows the sewage to form a longitudinal circulation around the biological filler to fully contact with the microorganisms on the filler surface.

[0057] The first aeration device 414 is at least one of a microporous aerator, a tubular aerator, a perforated tube, a vortex mixing aerator, a nano aeration tube, etc. In this embodiment, the first aeration device 414 is a microporous aerator.

[0058] Further, see Figure 3 In this embodiment, a floating island 415 may be provided on the top of the fixed bed biofilm module skeleton 413, and cultivation holes are added on the floating island 415 to plant aquatic plants to create a landscape effect.

[0059] Furthermore, in this embodiment, the biofilm filler 411 is in sheet form, on which functional bacteria for targeted domestication of target pollutants (COD, ammonia nitrogen) are attached.

[0060] Furthermore, in this embodiment, the biofilm filler 411 is made of polyester fiber.

[0061] Furthermore, in this embodiment, the sheet filler 411 is provided with a mounting hole, and the plurality of support rods 412 pass through the mounting holes of the sheet filler 411 in sequence so that the sheet filler 411 is suspended and fixed in parallel on the module frame 413 .

[0062] The sewage treatment process of a sewage treatment system for a storage tank coupled with a fixed-bed biofilm module provided in this embodiment is as follows: (1) During the rainy season, domestic sewage enters the interception well of the water inlet area 1 through the sewage pipe 11 and rainwater enters the interception well of the water inlet area 1 through the rainwater pipe 12. The mixed rainwater and sewage in the interception well enters the storage area 2 through the first pipe 71 and then enters the grille well of the pretreatment area 3 through the second pipe 72. The larger suspended solids and floating debris in the mixed rainwater and sewage in the storage area 2 are separated and removed through the grille well. After that, the mixed rainwater and sewage are discharged through the outlet lift pump 63. And enter the biochemical treatment area 4 through the third pipe 73, the first aeration device 414 in the biochemical treatment area 4 is turned on, and the rainwater, sewage and mixed drainage pass through the air-water channel formed by multiple suspended and fixed biofilm fillers 411 from bottom to top, and form a longitudinal circulation around the biofilm filler 411. The rainwater, sewage and mixed drainage are fully mixed and contacted with the biofilm filler 411 through oxygen supply and aeration. The organic matter, ammonia nitrogen and other pollutants in the rainwater, sewage and mixed drainage are catalytically degraded by the functional bacteria attached to the biofilm filler 411, realizing the rapid biochemical treatment of the rainwater, sewage and mixed drainage. The rainwater, sewage and mixed drainage after biochemical treatment enters the deep treatment area 5 through the fourth pipe 74, and is filtered and deeply treated by the magnetic microfiltration integrated machine. The finally purified rainwater, sewage and mixed drainage is discharged from the system through the fifth pipe 75, and can be directly discharged to the nearby receiving water body on the spot.

[0063] (2) During the dry season, due to the small amount of rainfall, there is usually no water in the storage area 2. Therefore, the mixed drainage of rainwater and sewage or domestic sewage in the water inlet area 1 can directly enter the pretreatment area 3 through the sixth pipe 76, and then be discharged after biochemical and deep treatment in the biochemical treatment area 4 and the deep treatment area 5 respectively.

[0064] Example 2

[0065] like Figures 4 to 6 As shown, this embodiment provides a storage tank sewage treatment system coupled with a circulation clarifier, which is connected in sequence by pipes to the water inlet area 1, the storage area 2, the pretreatment area 3, the biochemical treatment area 4 and the deep treatment area 5. This embodiment is different from Example 1 in that the modular sewage treatment device provided in the biochemical treatment area 4 is a circulation clarifier 42, and the circulation clarifier 42 is suspended and installed in the biochemical treatment area 4. The circulation clarifier 42 includes a container body 421, a sedimentation chamber 422 and an overflow trough 423, the sedimentation chamber 422 is located in the body 421, and the overflow trough 423 is located above the sedimentation chamber 422.

[0066] Furthermore, a second aeration device 43 is provided at the bottom of the biochemical treatment zone 4. The circulation clarifier 42 utilizes the air lift power generated by oxygen supply aeration to generate circulation of the mixed liquid, thereby realizing reaction and precipitation integration and unpowered sludge return in the biochemical treatment zone 4.

[0067] The second aeration device 43 is at least one of a microporous aerator, a tubular aerator, a perforated tube, a vortex mixing aerator, a nano aeration tube, etc. In this embodiment, the second aeration device 43 is a microporous aerator.

[0068] Furthermore, the storage area 2 and the biochemical treatment area 4 are two independent pools, respectively called the storage pool 8 and the biochemical treatment pool 9, and the biochemical treatment pool 9 is arranged above the storage pool 8. It should be noted that the storage pool 8 is an existing rainwater storage facility, and the biochemical treatment pool 9 is a newly added biochemical treatment facility.

[0069] Furthermore, the water inlet area 1 is arranged at the front end of the regulating reservoir 8. The pretreatment area 3 and the deep treatment area 5 are arranged above the regulating reservoir 8. Sewage enters the regulating reservoir 2 through the water inlet area 1, and is then discharged after being treated in the pretreatment area 3, the biochemical treatment area 4 and the deep treatment area 5.

[0070] Furthermore, in the present embodiment, the water inlet area 1 is in the form of an intercepting well, which is arranged at the front end of the regulating reservoir 8, connected to the combined sewer pipe 11 and the rainwater pipe 12, and collects mixed rainwater and sewage drainage.

[0071] Furthermore, in this embodiment, the pretreatment area 3 is in the form of a sand settling tank, which is arranged above the regulating tank 8.

[0072] Furthermore, the deep treatment zone 5 is in the form of a coagulation sedimentation tank, which is arranged above the regulating tank 8.

[0073] The system operation process of this embodiment can refer to Example 1.

[0074] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] The above is a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A sewage treatment system for a storage tank coupled with a modular sewage treatment device, characterized in that: It comprises a storage area and a biochemical treatment area which are connected in sequence according to the direction of water flow, wherein one or more modular sewage treatment devices are arranged in the biochemical treatment area, and sewage in the storage area enters the biochemical treatment area for biochemical treatment and then is discharged; the modular sewage treatment device is a circulating clarifier or a fixed-bed biofilm module; the circulating clarifier comprises a container body, a sedimentation chamber and an overflow trough, wherein the sedimentation chamber is located in the container body, and the overflow trough is located above the sedimentation chamber; the fixed-bed biofilm module comprises a module skeleton, a support rod and a plurality of biofilm fillers, wherein the biofilm filler is a sheet-like or honeycomb structure, and the biofilm filler is suspended and fixed on the module skeleton by support rods, and an air-water channel is formed between adjacent biofilm fillers.

2. The storage tank sewage treatment system coupled with the modular sewage treatment device according to claim 1, characterized in that: One or more aeration devices are arranged at the bottom of the biochemical treatment area, and the aeration device is located below the modular sewage treatment device.

3. The storage tank sewage treatment system coupled with the modular sewage treatment device according to claim 1, characterized in that: The storage area and the biochemical treatment area are located in the same pool body and are separated into independent spaces by partitions or walls.

4. The storage tank sewage treatment system coupled with the modular sewage treatment device according to claim 1, characterized in that: The storage area and the biochemical treatment area are two independent pools, respectively called the storage pool and the biochemical treatment pool. The storage pool is an existing rainwater storage facility, and the biochemical treatment pool is arranged above the storage pool.

5. The storage tank sewage treatment system coupled with the modular sewage treatment device according to any one of claims 1 to 4, characterized in that: The water inlet end of the regulating and storage area is also connected to the water inlet area, and the sewage converges in the water inlet area and then enters the regulating and storage area.

6. The storage tank sewage treatment system coupled with the modular sewage treatment device according to claim 5, characterized in that: The water inlet area is a retention well.

7. The storage tank sewage treatment system coupled with the modular sewage treatment device according to claim 5, characterized in that: A pretreatment area is also connected between the storage area and the biochemical treatment area. The sewage in the storage area first enters the pretreatment area for pretreatment and then enters the biochemical treatment area for biochemical treatment.

8. The storage tank sewage treatment system coupled with the modular sewage treatment device according to claim 7, characterized in that: The pretreatment area is a grid well and / or a grit chamber.

9. The storage tank sewage treatment system coupled with the modular sewage treatment device according to any one of claims 1 to 4, characterized in that: The drainage end of the biochemical treatment area is also connected to a deep treatment area, and the sewage is discharged into the deep treatment area after being biochemically treated in the biochemical treatment area.

10. The storage tank sewage treatment system coupled with the modular sewage treatment device according to claim 9, characterized in that: The deep treatment area is a coagulation sedimentation tank and / or a filtration tank.

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