Tidal biological contact oxidation device and sewage treatment system comprising same

Abstract

The utility model provides a tidal biological contact oxidation device and a sewage treatment system comprising the same. The device comprises a reaction tank and a water collecting tank which are communicated through at least one drainage pipe, a filler layer and a water collecting layer are sequentially arranged in the reaction tank from top to bottom; the other end of the drainage pipe extends upwards and extends out of the water collecting tank; an aeration pipe is arranged in the water collecting layer; an upper liquid level sensor and a lower liquid level sensor are arranged in the reaction tank; the upper liquid level sensor and the lower liquid level sensor are respectively arranged at the upper part and the bottom of the filler layer; a water pump is arranged on the drainage pipe; the water pump is arranged in the water collecting tank. According to the biological contact oxidation device, the problem of filler blockage in a traditional biological contact oxidation device is solved, updating of a biological membrane is promoted, the sewage treatment effect and the operation efficiency are improved, and the operation and maintenance cost is also reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a tidal biological contact oxidation device and a wastewater treatment system containing the device. Background Technology

[0002] Wastewater treatment technologies are constantly being researched and optimized. Among them, biological contact oxidation technology has been widely used in the field of wastewater treatment due to its high treatment capacity, excellent resistance to shock loads, and stable operating characteristics. The working principle of biological contact oxidation technology mainly relies on the formation and renewal of a biofilm on the surface of the packing material, converting organic matter in wastewater into harmless substances through the metabolic action of microorganisms. However, in practical applications, traditional biological contact oxidation devices have gradually revealed some problems, especially the problem of packing material clogging, which has become one of the key factors restricting its effectiveness.

[0003] Specifically, as a carrier for biofilm attachment, the packing material is prone to excessive biofilm growth and the accumulation of suspended solids during long-term operation, leading to pore blockage. This phenomenon severely affects the uniform distribution of water flow and reduces the contact efficiency between wastewater and the biofilm. To maintain the normal operation of the device, the packing material must be cleaned or replaced periodically. This operation not only increases the labor intensity of maintenance personnel but also incurs additional economic costs, reducing the economic viability and practicality of biological contact oxidation technology.

[0004] In view of the above problems, there is an urgent need for a biological contact oxidation device that can solve the problem of packing blockage and improve the efficiency of sewage treatment. Utility Model Content

[0005] This invention provides a tidal biological contact oxidation device to solve the defects of existing technologies such as packing blockage and low sewage treatment efficiency.

[0006] A tidal biological contact oxidation device includes: a reaction tank for carrying out biological contact oxidation reaction; and a water collection tank for collecting and storing water treated by the reaction tank.

[0007] The reaction tank and the water collection tank are spatially separated from each other and are connected by at least one drain pipe.

[0008] Inside the reaction tank, a packing layer and a water collection layer are arranged sequentially from top to bottom; one end of the drain pipe is connected to the water collection layer, and the other end extends upward and out of the water collection tank; an aeration pipe is installed inside the water collection layer.

[0009] An upper liquid level sensor and a lower liquid level sensor are installed in the reaction tank; the upper liquid level sensor and the lower liquid level sensor are respectively located at the top and bottom of the packing layer.

[0010] A water pump is installed on the drain pipe; the water pump is located inside the water collection tank.

[0011] Furthermore, as described above, the tidal biological contact oxidation device is equipped with a sensor for detecting water quality within the water collection tank.

[0012] Furthermore, in the tidal biological contact oxidation device described above, the packing layer includes: a suspended packing layer and a three-dimensional elastic packing layer;

[0013] The suspended filler layer is disposed above the three-dimensional elastic filler layer; the two are separated by a filler support.

[0014] Furthermore, in the tidal biological contact oxidation device described above, the suspended packing layer occupies 60% of the packing area volume; the three-dimensional elastic packing layer occupies 40% of the packing area volume.

[0015] Furthermore, in the tidal biological contact oxidation device described above, the filler in the suspended filler layer includes: polyethylene suspended balls with a diameter of 80-150 mm and a porosity of ≥90%.

[0016] Furthermore, in the tidal biological contact oxidation device described above, the filler of the three-dimensional elastic filler layer includes: fiber bundles, which are vertically suspended on the filler support;

[0017] The spacing between the fiber bundles is 50 mm; the diameter of the fiber filaments constituting the fiber bundles is 0.5 mm.

[0018] Furthermore, in the tidal biological contact oxidation device described above, the water collection layer and the three-dimensional elastic packing layer are separated by a packing support; the water collection layer is filled with gravel or pebbles.

[0019] Furthermore, in the tidal biological contact oxidation device described above, the gravel or pebbles laid in the water collection layer are 200-300 mm thick.

[0020] Furthermore, in the tidal biological contact oxidation device described above, the gravel or pebble has a particle size of 16-32 mm.

[0021] Furthermore, in the tidal biological contact oxidation device described above, the water pump is a Norside 350QZ-70 submersible axial flow pump, a ZLB type vertical axial flow pump, or a QZB series submersible axial flow pump.

[0022] A wastewater treatment system includes a sedimentation tank, a filter, and a tidal biological contact oxidation device as described above.

[0023] The tidal biological contact oxidation device of this invention has the following beneficial effects:

[0024] (1) Improve oxygen utilization: Through tidal operation, when water is rapidly discharged, air is drawn into the packing material of the reaction tank. Oxygen quickly enters the liquid film of the packing material through mass transfer, providing the oxygen required for biofilm degradation of organic matter and ammonia nitrification. This oxygen supply method far exceeds the oxygen supply efficiency of traditional submerged aeration, reduces the amount of air required for artificial aeration, and lowers operating costs.

[0025] (2) Promote biofilm renewal: During tidal operation, the water level in the submerged section of the reaction tank drops rapidly, promoting the shedding and renewal of biofilm, preventing biofilm aging and clogging, and enhancing the sewage purification effect.

[0026] (3) Preventing packing blockage: Through periodic water level fluctuations, the packing layer is less likely to be blocked by biofilm and suspended solids, reducing the frequency of cleaning and replacing packing and lowering operation and maintenance costs.

[0027] (4) Improve wastewater treatment efficiency: Through tidal operation, the biofilm has more sufficient contact with wastewater and air, which improves the degradation efficiency of organic matter and the removal rate of ammonia nitrogen. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the tidal biological contact oxidation device provided by this utility model;

[0029] Figure label:

[0030] 1-Reaction tank, 2-Inlet pipe, 3-Collection tank, 4-Aeration pipe, 5-Suspended packing layer, 6-Three-dimensional elastic packing layer, 7-Packing support, 8-Collection layer, 9-Water pump, 10-Controller, 11-Upper liquid level sensor, 12-Lower liquid level sensor, 13-Drain pipe, 2-1 Inlet pipe valve, 13-1 Drain pipe valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] Figure 1 This is a schematic diagram of the tidal biological contact oxidation device provided by this utility model, as shown below. Figure 1As shown, the device includes: a reaction tank 1 for carrying out a biological contact oxidation reaction, with an inlet pipe 2 installed at the top of the reaction tank 1; and a collection tank 3 for collecting and storing water treated by the reaction tank 1. The reaction tank 1 and the collection tank 3 are spatially separated and connected by at least one drain pipe 13. Inside the reaction tank 1, a packing layer and a water collection layer 8 are arranged sequentially from top to bottom. One end of the drain pipe 13 is connected to the water collection layer 8, and the other end extends upward and out of the collection tank 3. An upper liquid level sensor 11 and a lower liquid level sensor 12 are installed inside the reaction tank 1. The upper liquid level sensor 11 and the lower liquid level sensor 12 are respectively located at the top and bottom of the packing layer. A water pump 9 is installed on the drain pipe 13. The water pump 9 is located inside the collection tank 3. The upper liquid level sensor 11, the lower liquid level sensor 12, and the water pump 9 are all electrically connected to a controller.

[0033] An aeration pipe 4 is provided in the water collection layer 8. The aeration pipe 4 includes an aeration main pipe and aeration branch pipes. The aeration branch pipes are evenly distributed at the bottom of the water collection layer 8. The aeration main pipe is connected to the aeration branch pipes and is used to introduce air into the reaction tank. The aeration main pipe is connected to an external air supply device. The air supply device includes a blower or an air compressor.

[0034] Specifically, wastewater enters reaction tank 1 through inlet pipe 2 and remains there, reacting with the biofilm attached to the packing layer. When the wastewater comes into contact with the biofilm, the organic matter in the water is adsorbed and oxidized by the microorganisms, transforming into new biofilm or harmless substances such as carbon dioxide. The main aeration pipe and branch aeration pipes introduce air into the reaction tank, providing the necessary oxygen for the microorganisms and also acting as a stirrer and mixer, ensuring sufficient contact between the oxygen, wastewater, and packing material. The treated wastewater is collected in collection tank 3 through pipes. Depending on the needs, the treated water can be re-entered into the wastewater treatment system for further treatment or directly discharged into the environment.

[0035] The device provided in this application operates as follows:

[0036] When wastewater is introduced into the reaction tank, the water level gradually rises. As the water level rises, the wastewater gradually submerges the packing layer, allowing the biofilm on the packing layer to fully contact the wastewater and carry out a biological contact oxidation reaction. When the packing material in the reaction tank becomes clogged, the water level in the reaction tank is monitored. When the water level rises to the position of the upper liquid level sensor 11, the controller starts the water pump 9 to pump water, causing the water level in the reaction tank to drop rapidly. When the reaction tank is at a low water level (i.e., the water level is below the lower liquid level sensor 12), the controller shuts off the water pump. At this time, water is slowly added to the reaction tank 1 through the inlet pipe 2, and the water gradually submerges the packing layer. Finally, when the water level rises to touch the upper liquid level sensor, the controller starts the water pump again to pump water. This cycle repeats, and the liquid level in the reaction tank fluctuates periodically in a tidal pattern, thus forming a tidal operation process.

[0037] The device provided in this application operates in a tidal manner, where the water level in the reaction tank rises slowly and falls rapidly, simulating the tidal phenomenon in nature. During the rapid drop in water level, the water flow scours the packing layer, helping to remove biofilm and suspended solids attached to the packing surface and preventing their long-term accumulation that could lead to blockage. Furthermore, during the rapid drop in water level, due to the scouring effect of the water flow and changes in oxygen supply, aging biofilm is more easily detached from the packing surface. The detached biofilm provides space for the growth of new biofilm, thus promoting biofilm renewal. This helps maintain the biofilm thickness within a suitable range, ensuring the effective transfer of oxygen and organic matter. The renewed biofilm has higher activity and can more effectively degrade organic matter in wastewater, thereby improving wastewater treatment efficiency. In addition, because the packing layer is less prone to blockage, the need for regular cleaning or replacement of the packing is reduced, thus lowering the labor intensity and economic costs of operation and maintenance. Moreover, the tidal operation mode allows oxygen to quickly enter the liquid film of the packing material through mass transfer, providing a source of oxygen required for the degradation of organic matter and nitrification of ammonia nitrogen by the biofilm, greatly improving the oxygen transfer efficiency, reducing the amount of gas required for artificial aeration, and further reducing operating costs.

[0038] Furthermore, the device provided in this application has a sensor for detecting water quality installed in the water collection tank 3, and the sensor is electrically connected to the controller.

[0039] Specifically, this application utilizes water quality sensors to monitor ammonia nitrogen concentration in the collection tank and changes in suspended solids concentration, thereby indirectly reflecting the blockage status of the packing layer. A sustained increase in suspended solids concentration may indicate blockage in the packing layer, necessitating cleaning or replacement of the packing material. Furthermore, after confirming blockage, the water quality sensor can provide guidance for cleaning operations. For example, by monitoring changes in water quality before and after cleaning, the cleaning effect can be assessed, and cleaning strategies adjusted to ensure the packing layer returns to optimal operating condition.

[0040] The device provided in this application can establish an early warning mechanism for the blockage of the packing layer through a water quality sensor. When the water quality parameters reach a preset threshold, it automatically triggers a cleaning operation or adjusts the operating strategy to prevent blockage problems from occurring.

[0041] Furthermore, the packing layer includes: a suspended packing layer 5 and a three-dimensional elastic packing layer 7; the suspended packing layer 5 is disposed above the three-dimensional elastic packing layer 7; the two are separated by a packing support 7.

[0042] Specifically, the suspended packing layer and the three-dimensional elastic packing layer provide different habitats for microorganisms. The suspended packing, propelled by airflow, can achieve full-pool fluidization, improving oxygen transfer rate and utilization efficiency. The three-dimensional elastic packing layer has highly variable porosity, is less prone to clogging, and facilitates oxygen diffusion and biofilm renewal. This two-layer packing design allows the device to better cope with water quality fluctuations and sudden surges in high-concentration organic wastewater, thereby reducing the risk of packing blockage and improving pollutant removal efficiency.

[0043] The device provided in this application, by setting two layers of packing material (a suspended packing layer and a three-dimensional elastic packing layer) from top to bottom in the reaction tank, can significantly improve the treatment capacity, stability and effluent quality of the biological contact oxidation device, while reducing operation and maintenance costs.

[0044] Furthermore, in the device provided in this application, the suspended packing layer 5 occupies 60% of the packing area volume; and the three-dimensional elastic packing layer 7 occupies 40% of the packing area volume.

[0045] Specifically, the suspended packing material is in a free-floating state within the reactor, allowing it to move freely with the water and air flow. This fluidity helps reduce close contact between the packing materials, thereby lowering the risk of clogging. Since the suspended packing layer occupies 60% of the volume, the large amount of suspended packing material can effectively mix and flow within the reactor, further reducing the likelihood of clogging. Simultaneously, the three-dimensional elastic packing layer has a large specific surface area and good elasticity, providing a stable attachment environment for microorganisms. Although the three-dimensional elastic packing layer occupies a smaller volume (40%), its unique structure and elasticity help mitigate the impact of water flow on the packing material, reducing clogging problems caused by water scouring. This application, by combining the suspended packing layer and the three-dimensional elastic packing layer, fully utilizes the advantages of both packing materials, creating a complementary effect. This combination effectively reduces the problem of packing clogging.

[0046] Further, the filler in the suspended filler layer includes: polyethylene suspended balls with a diameter of 80-150 mm and a porosity of ≥90%. The filler in the three-dimensional elastic filler layer 7 includes: fiber bundles, which are vertically suspended on the filler support 7; the spacing between the fiber bundles is 50 mm; and the fiber filaments constituting the fiber bundles have a diameter of 0.5 mm.

[0047] Specifically, the device provided in this application, by designing the porosity of the polyethylene suspended balls to ≥90%, facilitates the smooth flow of water and gas, reduces the resistance of water flow inside the packing material, and further reduces the risk of clogging. Designing the diameter of the suspended balls to 80-150mm ensures sufficient specific surface area for microbial attachment and good fluidity of the packing material in the water flow, further reducing the possibility of clogging. This also improves the efficiency of biofilm aging and shedding, ultimately improving wastewater treatment efficiency.

[0048] The fiber bundles are suspended vertically on the packing support, with a spacing of 50mm between the fiber filaments. This design facilitates smooth water flow and reduces the risk of clogging. The fiber filaments constituting the bundles have a diameter of 0.5mm, a size that gives the bundles good elasticity, allowing them to better adapt to the impact of water and air flow. This further reduces clogging caused by scouring, improves the efficiency of biofilm aging and shedding, and ultimately enhances wastewater treatment efficiency.

[0049] Furthermore, in the device provided in this application, the water collection layer 8 and the three-dimensional elastic packing layer 7 are separated by a packing support 7; the water collection layer 8 is filled with gravel or pebbles. The thickness of the gravel or pebbles laid in the water collection layer 8 is 200-300 mm; the particle size of the gravel or pebbles is 16-32 mm.

[0050] Specifically, the gravel or pebble layer has a certain filtering effect, which can intercept suspended solids, impurities, and microbial metabolic products in the water flow, preventing these substances from entering the drainage pipe and causing blockage. Furthermore, the design of the gravel or pebble layer enhances the shock resistance of the tidal biological contact oxidation device, enabling it to better cope with water quality fluctuations and sudden surges in high-concentration organic wastewater, thereby effectively extending the service life of the tidal biological contact oxidation device.

[0051] Furthermore, the water pump provided in this application is a low-head, high-flow axial flow pump, specifically a Nord 350QZ-70 submersible axial flow pump, a ZLB vertical axial flow pump, or a QZB series submersible axial flow pump.

[0052] Specifically, in order to enable the water in the reaction tank to be drawn quickly, thereby effectively flushing away the blockages and aging biofilm on the packing material, this application adopts a low-head, high-flow axial flow pump.

[0053] The tidal biological contact oxidation device proposed in this invention can be used alone or in combination with other wastewater treatment equipment. For example, the tidal biological contact oxidation device of this invention can be combined with sedimentation tanks, filters, and other equipment to form a complete wastewater treatment system.

[0054] The device provided in this application uses a tidal operation mode to allow oxygen to quickly enter the liquid film of the packing material through mass transfer, providing the oxygen required for biofilm degradation of organic matter and ammonia nitrification, which greatly improves the oxygen transfer efficiency, thereby providing a large amount of oxygen for biofilm degradation of organic matter and ammonia nitrification, thus effectively reducing the ammonia nitrogen concentration in the wastewater; while if submerged aeration is used (i.e., aeration is only carried out through the aeration pipes installed in the water collection layer 8), the reduction in ammonia nitrogen concentration is limited, as shown in Table 1.

[0055] Table 1. Water quality data during trial operation of the tidal biological contact oxidation device:

[0056]

[0057] As can be seen from Table 1, the tidal biological contact oxidation device provided in this application can effectively improve the removal efficiency of ammonia nitrogen through tidal operation.

[0058] Furthermore, this application can also determine the amount of air intake by adjusting the position of the low liquid level sensor; the lower the position of the low liquid level sensor, the greater the air intake. Thus, the air intake can be used to control the nitrification process and provide the necessary support for the removal of ammonia nitrogen.

[0059] In summary, the tidal biological contact oxidation device provided by this utility model solves the problem of packing blockage in traditional biological contact oxidation devices by simulating tidal phenomena and utilizing the scouring effect generated by rapid changes in water level. This promotes biofilm renewal, improves the uniformity of oxygen supply and biofilm renewal efficiency, and not only improves wastewater treatment effect and operating efficiency, but also reduces operation and maintenance costs.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tidal biological contact oxidation device, comprising: The reaction tank (1) is used for biological contact oxidation reaction; the water collection tank (3) is used for collecting and storing water treated by the reaction tank (1); The reaction tank (1) and the water collection tank (3) are connected by at least one drain pipe (13); a water inlet pipe (2) is provided at the top of the reaction tank (1); Inside the reaction tank (1), a packing layer and a water collection layer (8) are arranged sequentially from top to bottom; one end of the drain pipe (13) is connected to the water collection layer (8), and the other end extends upward and out of the outside of the water collection tank (3); an aeration pipe (4) is arranged inside the water collection layer (8); An upper liquid level sensor (11) and a lower liquid level sensor (12) are provided in the reaction tank (1); the upper liquid level sensor (11) and the lower liquid level sensor (12) are respectively located at the top and bottom of the packing layer; A water pump (9) is installed on the drain pipe (13); the water pump (9) is installed in the water collection tank (3).

2. The tidal biological contact oxidation device according to claim 1, characterized in that, A sensor for detecting water quality is installed in the water collection tank (3).

3. The tidal biological contact oxidation device according to claim 1 or 2, characterized in that, The filler layer includes: a suspended filler layer (5) and a three-dimensional elastic filler layer (6); The suspended filler layer (5) is disposed above the three-dimensional elastic filler layer (6); the two are separated by a filler support (7).

4. The tidal biological contact oxidation device according to claim 3, characterized in that, The suspended packing layer (5) occupies 60% of the volume of the packing area; the three-dimensional elastic packing layer (6) occupies 40% of the volume of the packing area.

5. The tidal biological contact oxidation device according to claim 3, characterized in that, The filler in the suspended filler layer includes: polyethylene suspended balls with a diameter of 80-150 mm and a porosity of ≥90%.

6. The tidal biological contact oxidation device according to claim 3, characterized in that, The filler of the three-dimensional elastic filler layer (6) includes: fiber bundles, which are vertically suspended on the filler support (7); The spacing between the fiber bundles is 50 mm; the diameter of the fiber filaments constituting the fiber bundles is 0.5 mm.

7. The tidal biological contact oxidation device according to claim 3, characterized in that, The water collection layer (8) and the three-dimensional elastic filler layer (6) are separated by a filler support (7); the water collection layer (8) is filled with gravel or pebbles.

8. The tidal biological contact oxidation device according to claim 7, characterized in that, The gravel or pebbles are laid in the water collection layer (8) with a thickness of 200-300 mm; the gravel or pebbles have a particle size of 16-32 mm.

9. The tidal biological contact oxidation device according to claim 3, characterized in that, The water pump (9) is a Nord 350QZ-70 submersible axial flow pump, a ZLB vertical axial flow pump, or a QZB series submersible axial flow pump.

10. A wastewater treatment system, characterized in that, It includes a sedimentation tank, a filter, and the tidal biological contact oxidation device as described in any one of claims 1-9.

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