Biological aerated filter

Abstract

The utility model relates to a biological aerated filter which comprises a pipeline group, a treatment barrel, a frequency conversion fan, a special treatment agent barrel and a high-power water suction pump, a microbubble aeration pipe is arranged at the bottom of an inner cavity of the treatment barrel, and a ceramsite biological filter bed is erected above the microbubble aeration pipe through a biological filter bed supporting platform; a hole site is formed in the top of the treatment barrel and is used for positioning and mounting the detector; an outlet water decanter is also vertically arranged in the treatment barrel; the pipeline group comprises a front-end treated water body inlet pipeline, a treated water body outlet pipeline, a micro-bubble aeration pipe air supply pipeline and a treatment agent adding pipeline, and the treatment barrel is used for carrying out working operations of water outlet, water inlet, agent adding and aeration through the pipeline group. The device is reasonable and simple in structure, and compared with a common activated sludge process, the device has the advantages of being high in organic load, small in occupied area by 2 / 3, low in cost by 30%, free of sludge bulking, high in oxygen transmission efficiency, good in effluent quality and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field, and particularly relates to an aerated biological filter. Background Art

[0002] The aerated biological filter, abbreviated as BAF, is a new type of biological membrane sewage treatment process developed in Europe and America in the late 1980s. It has been greatly developed in the early 1990s, with the largest scale reaching hundreds of thousands of tons per day, and has been developed to be able to denitrify and dephosphorize. This process has the functions of removing SS, COD, BOD, nitrification, denitrification, dephosphorization, and removing AOX (harmful substances). The aerated biological filter is a new process that integrates biological oxidation and interception of suspended solids.

[0003] The aerated biological filter is a new type of sewage biological treatment process that organically combines the biological oxidation mechanism and the depth filtration mechanism. It has very good, even irreplaceable functions in deep water treatment, treatment of micro-polluted water sources, treatment of refractory organic compounds, nitrification of low-temperature sewage, and treatment of low-temperature micro-polluted water.

[0004] The packing technology is in the core position in the aerated biological filter. The packing used in the aerated biological filter can be divided into inorganic packing and organic polymer packing according to the different raw materials used; according to the different packing densities, it can be divided into floating packing and submerged packing. Inorganic packing is generally submerged packing, and organic polymer packing is generally floating packing. Common inorganic packing includes ceramsite, coke, quartz sand, activated carbon, expanded valley aluminate, etc., and organic polymer packing is polystyrene, polyvinyl chloride, polypropylene, etc.

[0005] The problems existing in the existing aerated biological filter are as follows: after it operates for a certain period of time, the dirt intercepted in the filter layer and the grown biological membrane increase the filtration resistance, and the aerated biological filter must be backwashed; to solve this problem, some aerated biological filters with backwashing mechanisms have emerged at present, but their structures are relatively complex and the manufacturing cost is high; moreover, their backwashing water consumption is large and water resources are wasted. Therefore, it is necessary to carry out research and innovation to achieve cost reduction while simplifying the structure and making it practical. Summary of the Utility Model

[0006] To solve the above problems, the utility model adopts the following technical solutions:

[0007] An aerated biological filter, comprising a pipeline group, a treatment barrel, a variable-frequency blower, a special treatment chemical agent barrel and a high-power water pump, is characterized in that a microbubble aeration pipe is arranged at the bottom of the inner cavity of the treatment barrel, and a ceramsite biological filter bed is erected above the microbubble aeration pipe through a biological filter bed support platform; a hole is opened at the top of the treatment barrel for positioning and installing a detector; an effluent weir is vertically arranged in the treatment barrel, the end of the effluent weir is closely arranged against the bottom of the inner cavity of the treatment barrel, and the top end extends to the outside of the top of the treatment barrel; the pipeline group includes a front-end treated water inlet pipeline, a treated water discharge pipeline, a microbubble aeration pipe air supply pipeline and a treatment chemical agent dosing pipeline, and the treatment barrel performs the operations of discharging water, inlet water, dosing and aeration through the pipeline group.

[0008] Preferably, the special treatment chemical agent barrel is provided with a liquid level transmitter and a metering chemical agent dosing pump, and the metering chemical agent dosing pump is connected to the treatment chemical agent dosing pipeline to extract the chemical agent in the special treatment chemical agent barrel to the top of the treatment barrel for discharging.

[0009] Preferably, there are two high-power water pumps. One is an inlet water pump, which is connected to the inlet pipeline and introduced to the top of the treatment barrel for discharging through the front-end treated water inlet pipeline. The other is a drainage water pump, which is connected to the first effluent weir in the treatment barrel through the treated water discharge pipeline with an acid and alkali resistant electric switch valve and is connected to an outlet pipeline for discharging.

[0010] Preferably, the variable-frequency blower is connected to the microbubble aeration pipe in the treatment barrel through the microbubble aeration pipe air supply pipeline.

[0011] Preferably, the detector includes a liquid level transmitter, a conductivity detector and a dissolved oxygen rate detector.

[0012] Compared with the prior art, the advantages of the present utility model are as follows:

[0013] 1. The structure of the present utility model is reasonable and simple. Compared with the ordinary activated sludge method, it has the advantages of high organic load, 2 / 3 less floor area, 30% lower cost, no sludge bulking, high oxygen transfer efficiency and good effluent quality.

[0014] 2. The present utility model integrates biological oxidation and interception of suspended solids, can save the construction cost of the subsequent sedimentation tank, and replaces the traditional backwashing setting by designing a microbubble aeration pipe.

[0015] 3. The present utility model can control the effluent index by time and can improve the load impact resistance by controlling the inflow and outflow water volumes.

[0016] 4. The present utility model is batch-sequential inlet, can better control the aeration volume, so that anoxia and aerobic conditions are carried out simultaneously.

[0017] 5. The utility model has the characteristics of large volumetric load, large hydraulic load, short hydraulic retention time, less required capital construction investment, good effluent quality, low operation energy consumption and less operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0020] As Figure 1 shown, the utility model is an aerated biological filter, mainly composed of a pipeline group, a treatment barrel (1), a variable frequency blower (5), a special treatment chemical barrel (10) and a high-power water pump (12). The pipeline group includes a front-end treated water inlet pipeline (14), a treated water discharge pipeline (15), a microbubble aeration pipe air supply pipeline (16) and a treatment chemical dosing pipeline (17). Each pipeline is respectively connected to the corresponding equipment to realize the working operations of dosing, water inlet, water outlet and aeration.

[0021] At the bottom of the inner cavity of the treatment barrel (1) as the main working container, a microbubble aeration pipe (4) is provided. Above the microbubble aeration pipe (4), a ceramsite biological filter bed (2) is erected through a biological filter bed support platform (3). An effluent weir (6) is vertically arranged in the treatment barrel (1). The end of the effluent weir (6) is closely arranged against the bottom of the inner cavity of the treatment barrel (1), and the top extends outside the top of the treatment barrel (1), that is, it is fixedly arranged through the ceramsite biological filter bed (2). When the treatment barrel (1) is working, it can be divided based on the ceramsite biological filter bed (2) as a boundary. The area below the ceramsite biological filter bed (2) is an anoxic zone, and the area above the ceramsite biological filter bed (2) is an aerobic zone. In order to more intuitively observe and timely control the operation, a hole is opened at the top of the treatment barrel (1) for the detector to be positioned and installed. The detector includes a liquid level transmitter (7), a conductivity detector (8) and a dissolved oxygen rate detector (9). The horizontal position detected by the liquid level transmitter (7) is at the ceramsite biological filter bed (2), and the target detection positions of the conductivity detector (8) and the dissolved oxygen rate detector (9) are in the aerobic zone.

[0022] The chemical dosing operation of the present utility model is achieved by pumping from the configured dedicated chemical treatment agent barrel (10). Specifically, the dedicated chemical treatment agent barrel (10) is equipped with a liquid level transmitter (7) and a metering chemical dosing pump (11). The function of the liquid level transmitter (7) is to monitor the change of the chemical liquid level in the dedicated chemical treatment agent barrel (10) in real time to avoid the situation that an empty barrel cannot be pumped into the treatment barrel (1). The metering chemical dosing pump (11) is connected to the chemical treatment agent dosing pipeline (17) to pump the chemical in the dedicated chemical treatment agent barrel (10) to the top of the treatment barrel (1) for discharge. It should be noted that the output end of the chemical treatment agent dosing pipeline (17) is set at the top of the treatment barrel (1), and such a setting can make the chemical spill as evenly as possible.

[0023] The water inlet and outlet operations of the present utility model are realized based on a high-power water pump (12). There are two high-power water pumps (12). One is the water inlet pump, whose function is to pump external water sources into the treatment barrel (1). Specifically, the input end of the water inlet pump is connected to the water inlet pipeline (18), and the output end is introduced to the top of the treatment barrel (1) for discharge through the front-end treated water body inlet pipeline (14). The function of the other drainage pump is to pump and discharge the sewage precipitated by the effluent weir (6). Specifically, it is through the treated water body discharge pipeline (15) with an acid and alkali resistant electric switch valve (13). The treated water body discharge pipeline (15) connects the drainage pump and the effluent weir (6), and the output end of the drainage pump is connected to the water outlet pipeline (19).

[0024] As for the aeration operation of the present utility model, it is achieved through the microbubble aeration pipe air supply pipeline (16) connected to a variable frequency blower (5). It is located below the biological filter bed support platform (3) where the ceramsite biological filter bed (2) is installed. It is set at the bottom of the treatment barrel (1), so that the oxygen in the air can be transferred to the liquid in the aeration tank from bottom to top to the greatest extent, to supply the oxygen required for the aerobic biological metabolism, and at the same time fully and evenly mix the water body in the tank to achieve the purpose of biological treatment.

[0025] The general working process of the present utility model is as follows:

[0026] 1) Sewage enters the treatment barrel (1) through the water inlet pump.

[0027] 2) When the liquid level transmitter (7) in the treatment barrel (1) monitors that the pumped sewage reaches the set liquid level, the variable frequency blower (5) is started to work.

[0028] 3) The present utility model is configured with a control system, which can control the output power of the variable frequency blower (5) according to the monitoring data fed back by the dissolved oxygen detector (9), so as to keep the dissolved oxygen value in the barrel at 1 - 2 mg / L.

[0029] 4) The control system detects the water body value in the treatment tank (1) through the conductivity detector (8) to add the required amount of special treatment agent, and adds the metered agent through the metering dosing pump, so as to ensure that the pH value of the treated water body is between 7 and 8;

[0030] 5) The control system can be set to automatically increase the aeration volume regularly to wash the packing. Generally, the time node is 5 - 10 minutes. After the treatment time node arrives, the water body controls the water outlet height through the effluent weir, and the water body to be discharged is discharged to the backend treatment equipment by the drainage pump. Generally, the ratio of the inlet and outlet water for each batch of this utility model is 1 / 5 of the capacity of the treatment tank (1).

[0031] The above steps can operate automatically according to the set scheme based on the control system throughout the process.

[0032] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this utility model.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0034] In this utility model, unless otherwise clearly stipulated and defined, the terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific situations.

[0035] In the present utility model, unless otherwise clearly specified or defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one solution", "some solutions", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the solution or example are included in at least one solution or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same solution or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more solutions or examples.

Claims

1. An aerated biological filter, comprising a pipeline group, a treatment barrel (1), a variable frequency fan (5), a special treatment agent barrel (10) and a high-power water pump (12), characterized in that: A microbubble aeration pipe (4) is arranged at the bottom of the inner cavity of the treatment barrel (1), and a ceramsite biofilter bed (2) is arranged above the microbubble aeration pipe (4) via a biofilter bed support platform (3); a hole is provided at the top of the treatment barrel (1) for positioning and installing a detector; a water outlet decanter (6) is also vertically arranged in the treatment barrel (1), the end of the water outlet decanter (6) is arranged close to the bottom of the inner cavity of the treatment barrel (1), and the top of the water outlet decanter (6) extends to the outside of the top of the treatment barrel (1); the pipeline group comprises a front end treatment water body inlet pipeline (14), a treatment water body outlet pipeline (15), a microbubble aeration pipe air supply pipeline (16) and a treatment agent dosing pipeline (17), and the treatment barrel (1) performs water outlet, water intake, dosing and aeration operations through the pipeline group.

2. The aerated biological filter according to claim 1, characterized in that: The dedicated treatment agent barrel (10) is equipped with a liquid level transmitter (7) and a quantitative dosing pump (11), and the quantitative dosing pump (11) is connected to a treatment agent dosing pipeline (17) to extract the agent in the dedicated treatment agent barrel (10) to the top of the treatment barrel (1) for discharge.

3. The aerated biological filter according to claim 1, characterized in that: There are two high-power water pumps (12), one of which is an inlet water pump connected to the water inlet pipe (18) and introduced into the top of the treatment barrel (1) through the front-end treated water inlet pipe (14) for discharge, and the other is a drainage water pump, which is connected to the water outlet decanter (6) in the treatment barrel (1) through the treated water outlet pipe (15) with an acid- and alkali-resistant electric switch valve (13) and is connected to the water outlet pipe (19) for discharge.

4. The aerated biological filter according to claim 1, characterized in that: The variable frequency fan (5) is connected to the microbubble aeration pipe (4) in the treatment barrel (1) through the microbubble aeration pipe air supply pipeline (16).

5. The aerated biological filter according to claim 1, characterized in that: The detector comprises a liquid level transmitter (7), a conductivity detector (8) and a dissolved oxygen rate detector (9).

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