Integrated biological fluidized bed

Abstract

The utility model relates to sewage treatment technical field, and disclose an integrated biological fluidized bed. The fluidized bed, including fluidized bed shell, form with the oxygen -deficient zone, the aerobic zone, the sedimentation zone and the promotion reflux area through the bulkhead in the shell and divide, the oxygen -deficient zone is located the internal area of fluidized bed shell, the aerobic zone surrounds and sets up the outside of oxygen -deficient zone, the sedimentation zone sets up in the upper half of oxygen -deficient zone and aerobic zone joint part, the promotion reflux area sets up in the upper half of oxygen -deficient zone center. The device is through the innovative partition in single reactor, combines oxygen -deficient, aerobic, sedimentation and reflux function organically, and adopts the way that intermittent aeration and fluidized bed technology are combined, realizes the efficient degradation and the synchronous solid -liquid separation of organic matter, ammonia nitrogen, total phosphorus in domestic sewage or industrial waste water.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a high-efficiency bioreactor that integrates organic matter degradation, denitrification, phosphorus removal and solid-liquid separation functions, namely an integrated biological fluidized bed. Background Technology

[0002] Biological fluidized bed technology is a highly efficient water treatment process. By immobilizing a biofilm on fluidized packing material, it significantly improves biomass and mass transfer efficiency, offering advantages such as high treatment load and small footprint. However, traditional biological fluidized beds have a single function, typically targeting only the degradation of organic matter. They are difficult to simultaneously achieve denitrification, phosphorus removal, and solid-liquid separation within the same reactor, often requiring subsequent series of sedimentation tanks, filtration tanks, and other units, increasing system complexity and investment and operating costs.

[0003] Existing technologies such as activated sludge processes and biological contact oxidation suffer from low biomass, limited sludge loading, and poor nitrogen and phosphorus removal efficiency. Although traditional biological fluidized beds offer significant improvements in biomass and treatment load, they still lack an integrated device that can truly achieve simultaneous and efficient removal of multiple pollutants and deliver effluent that directly meets standards.

[0004] Therefore, there is an urgent need in this field for an integrated biological fluidized bed that is highly integrated, has good treatment efficiency, is easy to operate and manage, and whose effluent can be directly discharged in compliance with standards. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an integrated biological fluidized bed. This device innovatively divides the space within a single reactor, organically combining anoxic, aerobic, sedimentation, and reflux functions, and employs a combination of intermittent aeration and fluidized bed technology to achieve efficient degradation of organic matter, ammonia nitrogen, and total phosphorus in domestic sewage or industrial wastewater, as well as simultaneous solid-liquid separation.

[0007] (II) Technical Solution

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An integrated biological fluidized bed includes a fluidized bed shell, which is divided into an anoxic zone, an aerobic zone, a sedimentation zone, and a lift-back zone by partitions. The anoxic zone is located in the internal area of ​​the fluidized bed shell, the aerobic zone is arranged around the outside of the anoxic zone, the sedimentation zone is located in the upper half of the junction of the anoxic zone and the aerobic zone, and the lift-back zone is located in the upper half of the center of the anoxic zone. The bottom of the anoxic zone and the aerobic zone are provided with water distribution and aeration facilities, and the top of each zone is provided with a water collection tank. Each reaction zone is connected in sequence according to the water flow direction through connecting pipes to form a fluidized reaction system with bottom water inlet and top water outlet.

[0009] Preferably, the anoxic zone is filled with a first fluidized packing material, and a water inlet and return liquid distribution cylinder is provided at the center. The water inlet and return liquid distribution cylinder has a sleeve structure, with the inner pipe being the water inlet distribution pipe that extends laterally at the bottom of the anoxic zone. A return liquid distribution pipe is arranged around the water inlet distribution pipe. A baffle is provided between the bottom of the water inlet distribution pipe and the return liquid distribution pipe, and the baffle is provided with a water outlet. An anoxic zone water collection tank is provided at the upper periphery. The aerobic zone is filled with a second fluidized packing material, and an aerobic zone water inlet distribution pipe and an aeration pipe are provided at the bottom. An aerobic zone water collection tank is provided at the upper periphery. The sedimentation zone has a sludge collection hopper at the bottom, a sedimentation water inlet distribution pipe at the top of the collection hopper, and a sedimentation water collection tank at the upper periphery. The lift and return zone is equipped with a return liquid lift pump, and a mixed liquid inlet is provided at the lower side of this zone. The mixed liquid is pressurized by the lift pump and then connected to the return liquid distribution pipe of the anoxic zone through the outlet.

[0010] Preferably, it also includes a water inlet and an air inlet located on the upper side of the fluidized bed; the water inlet is connected to the water inlet and return liquid distribution cylinder of the anoxic zone; the air inlet is connected to the aeration pipe of the aerobic zone and the water inlet distribution pipe of the anoxic zone respectively through an air supply control valve.

[0011] Preferably, it also includes a programmable controller for controlling the aerobic air supply control valve, the anoxic air supply control valve and the reflux liquid lift pump connected to the air inlet, so as to realize intermittent aeration operation of the aerobic zone and automatic lifting of the reflux liquid.

[0012] Preferably, the anoxic zone water collection tank is connected to the bottom water inlet distribution pipe of the aerobic zone via a first connecting pipe, and the aerobic zone water collection tank is connected to the sedimentation water inlet distribution pipe and the mixed liquid inlet of the booster reflux zone via a second connecting pipe.

[0013] Preferably, the water entering the fluidized bed enters the bottom of the anoxic zone through the water inlet and the water distribution pipe, and flows through the anoxic zone, the aerobic zone and the sedimentation zone in sequence. The clean water is discharged from the sedimentation collection tank through the water outlet pipe, and the settled sludge is discharged from the sludge collection hopper through the sludge discharge pipe.

[0014] Preferably, the fluidized packing material filled in the anoxic zone and the aerobic zone achieves a fluidized state together with the mixed liquid under the action of inlet water pressure, return liquid pressure and aeration buoyancy, and the packing material is recycled through the return system.

[0015] Preferably, the fluidizing packing is a suspended biological carrier with a specific surface area greater than 300 m² / m³ and a true density approximately greater than that of water, which can maintain a fluidized state in the mixture of the anoxic and aerobic zones.

[0016] Preferably, the fluidized bed shell is a circular or square columnar structure.

[0017] The beneficial effects of this utility model are:

[0018] 1. The integrated biological fluidized bed proposed in this utility model innovatively uses partitions to separate multiple functional reaction zones required for biological wastewater treatment within a single fluidized bed. This allows for the degradation of organic matter, ammonia nitrogen, and phosphorus in the wastewater, as well as the separation of waste materials, ensuring that the effluent directly meets discharge standards. A single fluidized bed can treat wastewater to meet treatment standards.

[0019] 2. The intermittent aeration operation in the aerobic zone not only degrades organic matter in the water but also releases and accumulates phosphorus, eliminating the need for sludge recirculation and reducing operating costs. Simultaneously, the continuous influent / outfluent design with a constant water level eliminates the need for decanting equipment required for intermittent aeration, reducing construction investment.

[0020] 3. The addition of fluidized bed packing material in the anoxic and aerobic zones promotes the formation of a "dual sludge" system, consisting of suspended sludge and biofilm-attached sludge. This not only increases the biological concentration within the reaction zone but also diversifies the types of organisms, significantly improving the efficiency of the biochemical treatment process and enhancing the effluent quality. In engineering terms, this translates to lower project investment and higher effluent quality standards.

[0021] 4. Compared with traditional fluidized beds, integrated biological fluidized beds, due to their innovative functional zoning, intermittent aeration operation, and continuous influent / effluent design, exhibit advantages in engineering project implementation, including smaller land footprint, lower construction investment, and lower operating costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is an overall perspective view of the present invention;

[0024] Figure 3 This is a top view of the present invention.

[0025] In the diagram: 1. Anoxic Zone; 101. First Fluidized Packing Material; 102. Inlet and Return Liquid Distribution Cylinder; 103. Inlet Water Distribution Pipe; 104. Return Liquid Distribution Pipe; 105. Anoxic Zone Collection Tank; 106. Baffle; 107. Outlet Hole; 2. Aerobic Zone; 201. Second Fluidized Packing Material; 202. Aerobic Zone Inlet Water Distribution Pipe; 203. Aeration Pipe; 204. Aerobic Zone Collection Tank; 3. Sedimentation Zone; 301. Sludge Collection Hopper; 302. Sedimentation Inlet Water Distribution Pipe; 303. Sedimentation Collection Tank; 4. Lifting and Return Zone; 401. Return Liquid Lifting Pump; 402. Mixed Liquid Inlet; 403. Outlet; 5. Inlet; 6. Air Inlet; 601. Aerobic Air Supply Control Valve; 602. Anoxic Air Supply Control Valve; 7. Outlet; 8. Sludge Discharge Port; 9. Programmable Controller. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the embodiments, by Figure 1-3 An integrated biological fluidized bed (IBFB) is presented, with a cylindrical shell and internal partitions dividing it into an anoxic zone 1, an aerobic zone 2, a sedimentation zone 3, and a lift-reflux zone 4. The anoxic zone 1 is located at the center of the fluidized bed, surrounded by the aerobic zone 2. The sedimentation zone 3 is located in the upper half of the boundary between the anoxic and aerobic zones, and the lift-reflux zone 4 is located in the upper half of the center of the anoxic zone 1.

[0028] Anoxic Zone 1: Anoxic Zone 1 is filled with a first fluidized packing material 101. A water inlet and return liquid distribution cylinder 102 is provided in the center. The water inlet and return liquid distribution cylinder 102 is a sleeve structure. The internal pipe is a water inlet distribution pipe 103, which extends laterally at the bottom of Anoxic Zone 1. A return liquid distribution pipe 104 is provided around the water inlet distribution pipe 103. A baffle 106 is provided between the bottom of the water inlet distribution pipe 103 and the return liquid distribution pipe 104. A water outlet hole 107 is provided on the baffle. An anoxic zone water collection tank 105 is provided on the upper periphery.

[0029] Aerobic Zone 2: Aerobic Zone 2 is filled with a second fluidizing packing material 201. The bottom is equipped with an aerobic zone water inlet distribution pipe 202 and an aeration pipe 203, and the upper periphery is equipped with an aerobic zone water collection tank 204.

[0030] The first fluidized packing material 101 packed in the anoxic zone 1 and the second fluidized packing material 201 packed in the aerobic zone 2 can be of the same or different types. The fluidized packing material is an inert carrier suitable for biological wastewater treatment, with a true density approximately greater than water. It can remain fluidized under the action of rising water and air currents. The total packing volume can be designed according to the treatment load, generally 5% to 30% of the effective volume of each reaction zone. Under the aforementioned hydraulic and pneumatic action, the packing material achieves uniform fluidization within the reaction zone, effectively preventing clogging, and renews the biofilm through shearing action, maintaining high biological activity.

[0031] Meanwhile, the inlet water distribution pipe 103, the return liquid distribution pipe 104, and the aerobic zone inlet water distribution pipe 202 are all annular perforated pipes with several downward or lateral water distribution holes with a diameter of 5-10 mm and a hole spacing of 100-200 mm. The aerobic zone aeration pipe 203 adopts microporous aeration discs or aeration hoses, which are evenly arranged at the bottom of the aerobic zone with a spacing of 300-500 mm between aeration discs.

[0032] Sedimentation Zone 3: The bottom of sedimentation zone 3 is equipped with a sludge collection hopper 301, the top of which is equipped with a sedimentation water inlet pipe 302, and the upper periphery is equipped with a sedimentation water collection tank 303. The design surface hydraulic load of sedimentation zone 3 is 0.8~1.2m³ / (m²·h), and the hydraulic retention time (HRT) is 1.5~2.5 hours to ensure good solid-liquid separation effect.

[0033] To further ensure uniform effluent, stable liquid level, and prevent scum overflow, each of the water collection tanks can be equipped with an outlet weir, which can be a sawtooth triangular weir or a flat rectangular weir. At the same time, to ensure that the mixed liquid in each reaction zone (anoxic zone, aerobic zone) can enter the effluent collection tank smoothly and evenly, and to prevent short circuits and surges, an annular flow guiding channel or flow stabilizing zone can be provided between the top of the reaction zone and the effluent collection tank.

[0034] Reflux Zone 4: Reflux Zone 4 is equipped with a reflux liquid booster pump 401. A mixed liquid inlet 402 is located at the lower side of this zone. After being pressurized by the booster pump 401, the mixed liquid is connected to the reflux distribution pipe 104 of the anoxic zone 1 through the outlet 403. The flow rate of the reflux liquid booster pump 401 is adjustable, used to control the ratio of the mixed liquid reflux flow rate (Q_R) to the influent flow rate (Q), i.e., the reflux ratio (R=Q_R / Q) is maintained between 100% and 300%. Control System: The programmable controller 9 controls the aerobic air supply control valve 601 connected to the air inlet 6, the anoxic air supply control valve 602, and the reflux liquid booster pump 401 in Reflux Zone 4, to achieve intermittent aeration operation of the aerobic zone 2 and automatic boosting of the reflux liquid. Meanwhile, the programmable controller 9 has a preset timing control program to control the aerobic zone to operate in the following cycle: aeration for 8-10 hours, aeration stopped for 2-4 hours, and the return liquid lift pump 401 adopts a continuous operation mode.

[0035] Workflow:

[0036] Wastewater enters the central distribution cylinder 102 through inlet 5, mixes with the return liquid entering through return distribution pipe 104, and then enters the anoxic zone 1 through bottom distribution pipe 103. Simultaneously, some air enters the anoxic zone through control valve 602 to assist in stirring. Under anoxic conditions, denitrifying bacteria utilize the carbon source in the raw water to reduce nitrate nitrogen in the return liquid to nitrogen gas for removal (denitrification).

[0037] The effluent from the anoxic zone enters the collection tank 105, and is then introduced into the distribution pipe 202 at the bottom of the aerobic zone via a connecting pipe. Air enters the aerobic zone through the aeration pipe 203 via the control valve 601. Under the control of the programmable controller 9, the aerobic zone operates in a cycle of 10 hours of aeration followed by 2 hours of aeration, alternately completing the oxidation and nitrification of organic matter, as well as the phosphorus release and uptake processes by polyphosphate-accumulating bacteria.

[0038] The effluent from the aerobic zone enters the collection tank 204, and is then diverted through pipes to the sedimentation zone distribution pipe 302 and the booster return zone inlet 402.

[0039] In the sedimentation zone, the sludge settles into the sludge hopper 301 under gravity and is periodically discharged through the sludge discharge port 8. The supernatant overflows evenly into the collection tank 303 and is finally discharged as qualified effluent through the outlet 7.

[0040] The mixed liquor entering the booster reflux zone 4 is pressurized by the booster pump 401 and then pumped back to the central water distribution cylinder 102 through the outlet 403. The reflux ratio is controlled at 200%, thereby completing the internal circulation of the nitrification liquor and ensuring the denitrification effect.

[0041] Under the combined action of influent pressure, return liquid pressure, and aeration buoyancy, the packing material in the anoxic and aerobic zones is always in a fluidized state, the biofilm is renewed in a timely manner, and high biological activity and treatment efficiency are maintained.

[0042] In summary, this integrated biological fluidized bed successfully combines the advantages of traditional fluidized bed, A² / O process and SBR process, achieving continuous water intake, intermittent aeration, efficient nitrogen and phosphorus removal and solid-liquid separation in one reactor, which has significant technical advantages and application value.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated biological fluidized bed, comprising a fluidized bed shell, wherein the shell is divided by partitions to form an anoxic zone (1), an aerobic zone (2), a sedimentation zone (3), and a lift-reflux zone (4), characterized in that... ； The anoxic zone (1) is located in the internal region of the fluidized bed shell, the aerobic zone (2) is arranged around the outside of the anoxic zone (1), the sedimentation zone (3) is arranged in the upper half of the junction of the anoxic zone (1) and the aerobic zone (2), and the lift reflux zone (4) is arranged in the upper half of the center of the anoxic zone (1). Both the anoxic zone (1) and the aerobic zone (2) are equipped with water distribution and aeration facilities at the bottom and water collection tanks at the top. Each reaction zone is connected in sequence according to the direction of water flow through connecting pipes, forming a fluidized reaction system with water entering from the bottom and exiting from the top.

2. The integrated biological fluidized bed according to claim 1, characterized in that: The anoxic zone (1) is filled with a first fluidized packing material (101), and a water inlet and return liquid distribution cylinder (102) is provided in the center. The water inlet and return liquid distribution cylinder (102) is a sleeve structure. The inner pipe is a water inlet distribution pipe (103) which extends laterally at the bottom of the anoxic zone (1). A return liquid distribution pipe (104) is provided around the water inlet distribution pipe (103). A baffle (106) is provided between the bottom of the water inlet distribution pipe (103) and the return liquid distribution pipe (104). A water outlet hole (107) is provided on the baffle. An anoxic zone water collection tank (105) is provided on the upper periphery. The aerobic zone (2) is filled with a second fluidized packing material (201), and the bottom is provided with an aerobic zone water inlet distribution pipe (202) and an aeration pipe (203), and the upper periphery is provided with an aerobic zone water collection tank (204). The sedimentation zone (3) is provided with a sedimentation collection hopper (301) at the bottom, a sedimentation water inlet pipe (302) at the top of the collection hopper, and a sedimentation water collection trough (303) around the upper periphery. The reflux zone (4) is equipped with a reflux liquid booster pump (401), and a mixed liquid inlet (402) is provided at the lower side of the zone. After being pressurized by the booster pump (401), the mixed liquid is connected to the reflux distribution pipe (104) of the anoxic zone (1) through the outlet (403).

3. The integrated biological fluidized bed according to claim 2, characterized in that: It also includes a water inlet (5) and an air inlet (6) located on the upper side of the fluidized bed. The inlet (5) is connected to the inlet and return liquid distribution cylinder (102) of the anoxic zone (1); The air inlet (6) is connected to the aeration pipe (203) of the aerobic zone (2) and the water supply pipe (103) of the anoxic zone (1) through the air supply control valves (601, 602).

4. The integrated biological fluidized bed according to claim 3, characterized in that: It also includes a programmable controller (9) for controlling the aerobic gas supply control valve (601), the hypoxic gas supply control valve (602) connected to the air inlet (6) and the reflux liquid lift pump (401) in the lift reflux zone (4) to realize intermittent aeration operation of the aerobic zone (2) and automatic lifting of the reflux liquid.

5. The integrated biological fluidized bed according to claim 2, characterized in that: The anoxic zone water collection tank (105) is connected to the bottom water inlet distribution pipe (202) of the aerobic zone through the first connecting pipe, and the aerobic zone water collection tank (204) is connected to the sedimentation water inlet distribution pipe (302) and the mixed liquor inlet (402) of the booster reflux zone through the second connecting pipe.

6. The integrated biological fluidized bed according to claim 3, characterized in that: The fluidized bed is fed into the bottom of the anoxic zone (1) through the inlet (5) and the water distribution pipe (103). After flowing through the anoxic zone (1), the aerobic zone (2) and the sedimentation zone (3) in sequence, the clean water is discharged from the sedimentation collection tank (303) through the outlet pipe (7), and the settled sludge is discharged from the sludge collection hopper (301) through the sludge discharge pipe (8).

7. The integrated biological fluidized bed according to claim 2, characterized in that: The fluidized packing materials (101, 201) filled in the anoxic zone (1) and aerobic zone (2) achieve fluidization together with the mixed liquid under the action of inlet water pressure, return liquid pressure and aeration buoyancy, and the packing materials are recycled through the return system.

8. The integrated biological fluidized bed according to claim 6, characterized in that: The fluidized packing material (101, 201) is a suspended biological carrier with a specific surface area greater than 300 m² / m³ and a true density slightly greater than that of water. It can maintain a fluidized state in the mixture of the anoxic zone (1) and the aerobic zone (2).

9. The integrated biological fluidized bed according to claim 1, characterized in that: The fluidized bed shell is circular.

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