Biological aerated filter device suitable for pretreatment of waterworks

Abstract

The utility model discloses a biological aerated filter device suitable for pretreatment of a waterworks, and relates to the technical field of water purification devices, in particular to the biological aerated filter device suitable for pretreatment of the waterworks. Comprising a reaction component, a gas supply component, a drainage component and a filter tank formed by pouring building components or welding metal plate bodies, a water distribution pipe is fixedly mounted at the inner bottom of the filter tank; the biological membrane is hung on the biological membrane filler layer, so that when inflow water of the filter passes through the biological membrane filler layer, microorganisms attached to the biological membrane can adsorb and degrade pollutants in water, and meanwhile, suspended solids in the water can be well intercepted. Aeration is carried out in the filter tank, microorganisms are mainly nitrifying bacteria and COD degrading bacteria, the interior of the filter tank is fully aerated through the air supply component, and CODmn and ammonia nitrogen in water can be effectively removed. Compared with the prior art, the technical scheme is simple in structure and relatively good in CODmn and ammonia nitrogen removal effect.

Description

Technical Field

[0001] This utility model relates to the technical field of water purification devices, specifically an aerated biological filter device suitable for pretreatment in waterworks. Background Technology

[0002] The main water quality indicators in tap water include CODmn, turbidity, ammonia nitrogen, chloride ions, hardness, and heavy metals. In southern regions, river water or groundwater has lower hardness, and CODmn and ammonia nitrogen are also lower. Therefore, water treatment plants mainly need to focus on turbidity removal and sterilization. However, in northern regions, water hardness is higher, and river water is often polluted during the autumn harvest season, resulting in higher CODmn and ammonia nitrogen levels. Water at this concentration cannot be purified using activated sludge processes. Therefore, water treatment plants usually use advanced oxidation or physical adsorption methods to treat it. However, the operating cost of these processes is high, especially for water with relatively high concentrations, causing the treatment cost to exceed the affordability of water treatment plants.

[0003] In a published Chinese patent application (publication number CN211497291U), titled "An NBAF Biological Filter," a diversion pipe is used to allow the inlet pipe to perform both normal water intake and backwashing. Simultaneously, a blower, aeration pipe, and biological packing effectively filter the water and remove harmful substances such as COD. The backwash air inlet pipe can also be used for backwashing, making operation convenient. The ceramic water collector further filters the collected water during discharge, preventing incomplete purification and providing convenience for users. While this prior art can solve the aforementioned problems, its overall structure is complex, and its removal efficiency for COD and ammonia nitrogen in water is unsatisfactory. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides an aerated biological filter device suitable for pretreatment in waterworks, solving the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: an aerated biological filter device suitable for pretreatment in waterworks, comprising a reaction component, an air supply component, a drainage component, and a filter tank constructed using building components or welded from metal plates; a water distribution pipe is fixedly installed at the inner bottom of the filter tank; the reaction component is located on the inner wall of the middle part of the filter tank, and includes a biofilm packing layer, wherein the packing material in the biofilm packing layer is one of expanded polystyrene, polyurethane foam, mineral wool packing, or honeycomb packing; the air supply component includes an aeration pipe and a backwash pipe array, wherein the aeration pipe is fixedly installed on the inner bottom wall of the filter tank, and the backwash pipe array is fixedly installed at the inner bottom of the filter tank, with the backwash pipe array located above the aeration pipe.

[0008] Optionally, the biofilm packing layer includes an upper packing layer, a lower packing layer, and multiple packing skeletons. The packing skeleton is an overall mesh structure. The four perimeters of the packing skeleton are fixedly connected to the inner walls of the filter tank. The packing skeletons are arranged longitudinally in sequence. The lower packing layer and the upper packing layer are laid on the packing skeletons from bottom to top.

[0009] Optionally, the air supply component further includes a blower, a main air duct, a first air duct, and a second air duct. The medium outlet end of the blower is fixedly installed and connected to one end of the main air duct. The other end of the main air duct is connected to the first air duct and the second air duct respectively. The end of the first air duct away from the main air duct is fixedly installed and connected to the aeration pipe. The end of the second air duct away from the main air duct is fixedly installed and connected to the backwash pipe.

[0010] Optionally, the aeration pipe is a spiral coil, and the coils of the spiral coil are in the same plane; multiple first gas nozzles are fixedly installed on the outer wall of the aeration pipe.

[0011] Optionally, a plurality of second gas nozzles are fixedly installed on the backwash pipe bank, arranged sequentially along the pipe body.

[0012] Optionally, the first air duct is equipped with a manual aeration valve and a pneumatic aeration valve; the second air duct is equipped with a manual air backwash valve and a pneumatic air backwash valve.

[0013] Optionally, the drainage components include a drainage pump, a main drainage pipe, a vent pipe, and a backwash drainage pipe. The drainage pump is installed on the main drainage pipe. The inflow end of the vent pipe is located at the bottom of the filter tank and is connected to the interior of the filter tank. The outflow end of the vent pipe is connected to the inflow end of the main drainage pipe. The inflow end of the backwash drainage pipe is located inside the filter tank and is situated above the biofilm packing layer. The outflow end of the backwash drainage pipe is fixedly installed to the inflow end of the main drainage pipe and the two are connected.

[0014] Optionally, the vent pipe is equipped with a pneumatic vent valve and a manual vent valve; the backwash drain pipe is equipped with a pneumatic backwash drain valve and a manual backwash drain valve.

[0015] (III) Beneficial Effects

[0016] This utility model provides an aerated biological filter device suitable for pretreatment of tap water plants, which has the following beneficial effects:

[0017] 1. This aerated biological filter device, suitable for pretreatment in waterworks, utilizes a biofilm-coated packing layer. As the influent passes through this layer, the microorganisms attached to the biofilm adsorb and degrade pollutants, effectively intercepting suspended solids. Aeration within the filter, primarily employing nitrifying bacteria and COD-degrading bacteria, ensures thorough aeration, effectively removing CODmn and ammonia nitrogen from the water. Compared to existing technologies, this solution features a simpler structure and relatively better removal of CODmn and ammonia nitrogen.

[0018] 2. This aerated biological filter device, suitable for pretreatment in waterworks, uses one of the following fillers in the biofilm packing layer: expanded polystyrene, polyurethane foam, mineral wool, or honeycomb packing. These fillers are lightweight, high-porosity materials with a porosity exceeding 90%, possessing a large specific surface area, high biofilm formation capacity, and promoting microbial attachment and growth. Therefore, its water purification effect and shock resistance are superior to aerated biological filters using other fillers.

[0019] 3. This aerated biological filter device, suitable for pretreatment in waterworks, uses the same blower for both aeration and backwashing, eliminating the need for a separate backwashing water system and reducing initial investment costs. Furthermore, the aeration intensity required for backwashing is lower than that of aerated biological filters using ceramsite or volcanic rock, reducing backwashing energy consumption. Compared to existing technologies, the overall cost is lower. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the pipeline connection structure of an aerated biological filter device suitable for pretreatment in a waterworks, according to the present invention.

[0022] In the diagram: 1. Blower; 2. Biofilm packing layer; 201. Upper packing layer; 202. Lower packing layer; 203. Packing skeleton; 3. Water distribution pipe; 4. Backwash pipe; 5. Aeration pipe; 6. Dissolved oxygen detector; 7. Main air duct; 8. Manual aeration valve; 9. Pneumatic aeration valve; 10. Manual backwash valve; 11. Pneumatic backwash valve; 12. Pneumatic vent valve; 13. Vent pipe; 14. Manual vent valve; 15. Pneumatic backwash drain valve; 16. Manual backwash drain valve; 17. Backwash drain pipe; 18. Cleaning pipe; 19. First air duct; 20. Second air duct; 21. Main drain pipe; 22. Drain pump; 23. Inlet pipe. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying anything.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0025] Please see Figure 1 The present invention provides a technical solution: an aerated biological filter device suitable for pretreatment of tap water plants, comprising a reaction component, an air supply component, a drainage component, and a filter made by casting building components or welding metal plates.

[0026] The filter consists of an air supply unit for aerating the water in the filter bed, a reaction unit for adsorbing and degrading pollutants in the water, and aeration unit for removing CODmn and ammonia nitrogen, respectively. The drainage unit is used to discharge the water from the filter bed.

[0027] A water distribution pipe 3 is fixedly installed at the bottom of the filter tank. The water distribution pipe 3 is used to distribute water to the bottom of the filter tank to provide a water source for backwashing.

[0028] The reaction component is located on the inner side wall of the middle part of the filter tank. The reaction component includes a biofilm packing layer 2. The packing material in the biofilm packing layer 2 is one of expanded polystyrene, polyurethane foam, mineral wool packing, and honeycomb packing.

[0029] In this system, a biofilm is attached to the biofilm packing layer 2. As the influent passes through this layer, the microorganisms attached to the biofilm adsorb and degrade pollutants in the water, while also effectively intercepting suspended solids. Aeration is provided inside the filter via an air supply unit. The microorganisms, primarily nitrifying bacteria and COD-degrading bacteria, effectively remove CODmn and ammonia nitrogen from the water through thorough aeration.

[0030] The air supply components include an aeration pipe 5 and a backwash pipe array 4. The aeration pipe 5 is fixedly installed on the inner bottom wall of the filter tank, and the backwash pipe array 4 is fixedly installed on the inner bottom of the filter tank, with the backwash pipe array 4 located above the aeration pipe 5.

[0031] The aeration pipe 5 releases gas at the bottom of the filter bed, and the gas diffuses upwards from the bottom of the filter bed, thereby aerating the water. The backwash pipe 4 is used to transport gas to the bottom of the filter bed during backwashing. The gas carries the water in the distribution pipe 3 and diffuses upwards to backwash the inside of the filter bed.

[0032] Specifically, the biofilm packing layer 2 includes an upper packing layer 201, a lower packing layer 202, and multiple packing skeletons 203. The packing skeleton 203 is a mesh structure. The four periphery of the packing skeleton 203 is fixedly connected to the inner sidewall of the filter tank. The packing skeletons 203 are arranged longitudinally in sequence. The lower packing layer 202 and the upper packing layer 201 are laid on the packing skeletons 203 from bottom to top.

[0033] Each packing frame 203 provides stable support for the packing material in the lower packing layer 202 and the upper packing layer 201. The water to be purified flows from top to bottom within the filter bed, passing through the mesh openings of each packing frame 203. During backwashing, the water flows from bottom to top within the filter bed, passing through the mesh openings of each packing frame 203.

[0034] Specifically, the air supply components also include a blower 1, a main air duct 7, a first air duct 19, and a second air duct 20. The medium outlet end of the blower 1 is fixedly installed and connected to one end of the main air duct 7. The other end of the main air duct 7 is connected to the first air duct 19 and the second air duct 20 respectively. The end of the first air duct 19 away from the main air duct 7 is fixedly installed and connected to the aeration pipe 5. The end of the second air duct 20 away from the main air duct 7 is fixedly installed and connected to the backwash pipe 4.

[0035] Blower 1 is used to generate a large amount of airflow. Aeration airflow: The airflow generated by blower 1 flows sequentially through the main air duct 7 and the first air duct 19, then enters the aeration pipe 5. The airflow is discharged through the aeration pipe 5 and released into the water at the bottom of the filter tank, thus aerating the water in the filter tank. Backwash airflow: The airflow generated by blower 1 flows sequentially through the main air duct 7 and the second air duct 20, then enters the backwash pipe array 4. The airflow is discharged through the backwash pipe array 4 and released into the water at the bottom of the filter tank, thus providing air for backwashing.

[0036] More specifically, the aeration pipe 5 is a spiral coil, with each section of the spiral coil lying on the same plane. Multiple first gas nozzles are fixedly installed on the outer wall of the aeration pipe 5.

[0037] The airflow in the aeration pipe 5 is ejected through each first gas nozzle, and each first gas nozzle delivers a large amount of gas to a large area of ​​water at the bottom of the filter bed to achieve large-scale aeration.

[0038] More specifically, multiple second gas nozzles are fixedly installed on the backwash pipe bank 4, arranged sequentially along the pipe body.

[0039] In this process, the airflow in the backwash pipe 4 is ejected through each of the second gas nozzles, and each of the second gas nozzles delivers a large amount of gas to the large water body at the bottom of the filter tank, providing gas supply for the backwashing operation.

[0040] More specifically, the first air duct 19 is equipped with a manual aeration valve 8 and a pneumatic aeration valve 9. The second air duct 20 is equipped with a manual air backwash valve 10 and a pneumatic air backwash valve 11.

[0041] Among them, the manual aeration valve 8 and the pneumatic aeration valve 9 are both used to control the on / off state or opening degree of the first air duct 19. The manual air backwash valve 10 and the pneumatic air backwash valve 11 are both used to control the on / off state or opening degree of the second air duct 20.

[0042] Specifically, the drainage components include a drainage pump 22, a main drainage pipe 21, a vent pipe 13, and a backwash drainage pipe 17. The drainage pump 22 is mounted on the main drainage pipe 21. The inflow end of the vent pipe 13 is located at the bottom of the filter tank and is connected to the interior of the filter tank. The outflow end of the vent pipe 13 is connected to the inflow end of the main drainage pipe 21. The inflow end of the backwash drainage pipe 17 is located inside the filter tank and is situated above the biofilm packing layer 2. The outflow end of the backwash drainage pipe 17 is fixedly installed to the inflow end of the main drainage pipe 21, and the two are connected.

[0043] The drainage components are used to discharge water from the filter bed after purification or backwashing. After purification, the water collects at the bottom of the filter bed and flows sequentially through the vent pipe 13 and the main drain pipe 21 under the pumping of the drainage pump 22, thus being discharged. After backwashing, the water level rises from bottom to top. Once the water reaches the highest level, it backwashes the filter bed. During drainage, the drainage pump 22 draws water from above the biofilm packing layer 2, which flows sequentially through the backwash drain pipe 17 and the main drain pipe 21. Subsequently, the drainage pump 22 draws water from below the biofilm packing layer 2, which flows sequentially through the vent pipe 13 and the main drain pipe 21.

[0044] More specifically, a pneumatic vent valve 12 and a manual vent valve 14 are respectively installed on the vent pipe 13. A pneumatic backwash drain valve 15 and a manual backwash drain valve 16 are respectively installed on the backwash drain pipe 17.

[0045] Among them, the pneumatic vent valve 12 and the manual vent valve 14 are used to control the on / off state or opening degree of the vent pipe 13. The pneumatic backwash drain valve 15 and the manual backwash drain valve 16 are used to control the on / off state or opening degree of the backwash drain pipe 17.

[0046] A dissolved oxygen detector 6 is fixedly installed on the filter. Since the main removal indicator of this invention is COD... mn Because of the presence of ammonia nitrogen, the dissolved oxygen in the filter bed also needs to be controlled between 2 and 4 mg / L. The dissolved oxygen meter (6) plays a guiding role in adjusting the aeration rate in the filter bed. The dissolved oxygen meter (6) value in the filter bed should be controlled between 2 and 4 mg / L.

[0047] The top of the filter tank is equipped with an inlet pipe 23 for conveying water to be purified. A cleaning pipe 18 is installed at the top of the filter tank.

[0048] During operation, the purification process is as follows: Water to be purified is supplied to the filter bed through the inlet pipe 23, entering from top to bottom. The blower 1 is started, and the airflow generated by the blower 1 flows sequentially through the main air duct 7 and the first air duct 19 before entering the aeration pipe 5. The airflow is then discharged through the aeration pipe 5 into the bottom water of the filter bed, thus aerating the water in the filter bed. When the water to be purified passes through the biofilm packing layer 2, the microorganisms attached to the biofilm adsorb and degrade pollutants in the water, while also effectively intercepting suspended solids. Through aeration in the filter bed, the microorganisms, mainly nitrifying bacteria and COD-degrading bacteria, effectively remove CODmn and ammonia nitrogen from the water by fully aerating the filter bed with the blower 1.

[0049] After the purification operation is completed, open the pneumatic vent valve 12 and the manual vent valve 14, start the drain pump 22, and the drain pump 22 draws water from the filter tank. The water flows through the vent pipe 13 and the main drain pipe 21 and is discharged.

[0050] During backwashing: Water is supplied to the filter bed through backwash pipe 4, and the water rises within the filter bed. Blower 1 is started, and the airflow generated by blower 1 flows sequentially through main air duct 7 and second air duct 20 before entering backwash pipe 4. The airflow is then discharged through backwash pipe 4 and released into the water at the bottom of the filter bed. The water rises violently under the influence of the airflow, carrying a large amount of particulate impurities, thus achieving reverse cleaning of the filter bed's interior. During drainage, water is first pumped from above the biofilm packing layer 2 by drainage pump 22, flowing sequentially through backwash drain pipe 17 and main drain pipe 21. Then, drainage pump 22 pumps water from below the biofilm packing layer 2, flowing sequentially through vent pipe 13 and main drain pipe 21 before being discharged.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An aerated biological filter device suitable for pretreatment in waterworks, characterized in that: It includes a reaction component, an air supply component, a drainage component, and a filter pool made of building components or welded metal plates; a water distribution pipe (3) is fixedly installed at the bottom of the filter pool; The reaction component is located on the inner side wall of the middle part of the filter tank. The reaction component includes a biofilm packing layer (2). The packing material in the biofilm packing layer (2) is one of expanded polystyrene, polyurethane foam, mineral wool packing, and honeycomb packing. The air supply component includes an aeration pipe (5) and a backwash pipe (4). The aeration pipe (5) is fixedly installed on the inner bottom wall of the filter tank, and the backwash pipe (4) is fixedly installed on the inner bottom of the filter tank, with the backwash pipe (4) located above the aeration pipe (5). The biofilm packing layer (2) includes an upper packing layer (201), a lower packing layer (202), and multiple packing skeletons (203). The packing skeleton (203) is a mesh structure. The four periphery of the packing skeleton (203) is fixedly connected to the inner sidewall of the filter. The packing skeletons (203) are arranged longitudinally in sequence. The lower packing layer (202) and the upper packing layer (201) are laid on the packing skeletons (203) from bottom to top.

2. The aerated biological filter device for pretreatment of tap water plants according to claim 1, characterized in that: The air supply components also include a blower (1), a main air duct (7), a first air duct (19), and a second air duct (20). The medium outlet end of the blower (1) is fixedly installed and connected to one end of the main air duct (7). The other end of the main air duct (7) is connected to the first air duct (19) and the second air duct (20) respectively. The end of the first air duct (19) away from the main air duct (7) is fixedly installed and connected to the aeration pipe (5). The end of the second air duct (20) away from the main air duct (7) is fixedly installed and connected to the backwash pipe (4).

3. The aerated biological filter device for pretreatment of tap water plants according to claim 2, characterized in that: The aeration pipe (5) is a spiral coil, and the coils of the spiral coil are in the same plane; multiple first gas nozzles are fixedly installed on the outer wall of the aeration pipe (5).

4. The aerated biological filter device for pretreatment of tap water plants according to claim 2, characterized in that: Multiple second gas nozzles are fixedly installed on the backwash pipe bank (4) and arranged sequentially along the pipe body.

5. An aerated biological filter device suitable for pretreatment in waterworks according to claim 2, characterized in that: The first air duct (19) is equipped with an aeration manual valve (8) and an aeration pneumatic valve (9); the second air duct (20) is equipped with an air backwash manual valve (10) and an air backwash pneumatic valve (11).

6. The aerated biological filter device for pretreatment of tap water plants according to claim 1, characterized in that: The drainage components include a drainage pump (22), a main drainage pipe (21), a vent pipe (13), and a backwash drainage pipe (17). The drainage pump (22) is installed on the main drainage pipe (21). The inflow end of the vent pipe (13) is located at the bottom of the filter tank and is connected to the inside of the filter tank. The outflow end of the vent pipe (13) is connected to the inflow end of the main drainage pipe (21). The inflow end of the backwash drainage pipe (17) is located inside the filter tank and is located above the biofilm packing layer (2). The outflow end of the backwash drainage pipe (17) is fixedly installed with the inflow end of the main drainage pipe (21) and the two are connected.

7. An aerated biological filter device suitable for pretreatment of tap water plants according to claim 6, characterized in that: The vent pipe (13) is equipped with a pneumatic vent valve (12) and a manual vent valve (14); the backwash drain pipe (17) is equipped with a pneumatic backwash drain valve (15) and a manual backwash drain valve (16).

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