A wastewater advanced treatment device

Abstract

The utility model relates to wastewater treatment field, concretely is a kind of wastewater advanced treatment device, including the adjusting cylinder of wastewater medicament conditioning after filtration, the discharge port of adjusting cylinder is connected with membrane bioreactor, oxidation pond, reverse osmosis device, disinfection pond, blending tank and storage tank in proper order, to constitute wastewater treatment system;Adjusting cylinder is provided with feed inlet located at its bottom and discharge port located at its top, adjusting cylinder is provided with the stirring shaft that rotates driven by power source along the axial direction in, stirring shaft is provided with diffusion vane located at different height on, diffusion vane is provided with cavity in, diffusion vane is evenly provided with diffusion hole with diffusion vane internal cavity intercommunication on, stirring shaft is provided with medicament channel along the axial direction in, stirring shaft is provided with distribution hole along the radial direction on, which is connected with medicament channel and cavity in diffusion vane.The utility model makes medicament diffusion even, improves the reaction efficiency of medicament and pollutant, reduces the pollution load of subsequent membrane system.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, specifically a wastewater deep treatment device. Background Technology

[0002] With the accelerating pace of urbanization, the discharge of domestic wastewater is showing a year-on-year increasing trend. This not only puts enormous pressure on the urban ecological environment but also poses a potential threat to people's quality of life. The most common technology for treating wastewater involves adding chemicals to the wastewater for coagulation, oxidation, and other reactions to remove pollutants.

[0003] Traditional wastewater pretreatment methods often involve crude dosing of chemicals, typically by directly adding them at one or more points on the tank wall. This approach easily leads to excessively high local concentrations of chemicals while other areas suffer from insufficient concentrations, resulting in uneven mixing of chemicals and pollutants, incomplete reactions, and poor flocculation. This causes significant fluctuations in the quality of the pretreated effluent, with suspended solids and colloids frequently exceeding standards, increasing the fouling burden on the membrane system in subsequent treatment steps. Therefore, this issue urgently needs to be addressed. Utility Model Content

[0004] To avoid and overcome the technical problems existing in the prior art, this utility model provides a wastewater advanced treatment device. This utility model ensures uniform diffusion of the reagent, improves the reaction efficiency between the reagent and pollutants, and reduces the fouling load on the subsequent membrane system.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A wastewater deep treatment device includes a regulating cylinder for filtering wastewater after it has been treated with chemicals. The discharge port of the regulating cylinder is sequentially connected to a membrane bioreactor, an oxidation tank, a reverse osmosis unit, a disinfection tank, a mixing tank, and a storage tank to form a wastewater treatment system.

[0007] The regulating cylinder is provided with a feed inlet at its bottom and a discharge outlet at its top. An axially driven stirring shaft is provided inside the regulating cylinder. The stirring shaft is provided with diffuser blades at different heights. The diffuser blades have cavities inside. Diffusive holes that communicate with the cavities inside the diffuser blades are evenly provided on the diffuser blades. A drug channel is provided axially inside the stirring shaft. A distribution hole that communicates with the cavities inside the diffuser blades is provided radially on the stirring shaft.

[0008] As a further embodiment of this utility model: the ends of the mixing shaft adjacent to the feed inlet are provided with crushing blades, and the crushing blades, lifting impellers and various diffusion blades are arranged in sequence from top to bottom along the axial direction of the mixing shaft.

[0009] As a further improvement of this utility model, the crushing blade and the lifting impeller are arranged in close contact.

[0010] As a further embodiment of this utility model: a filter disc is horizontally arranged inside the regulating cylinder and fixed to the cylinder wall. The filter disc and the stirring shaft are coaxially rotated together, and the filter disc is located between the discharge port and the topmost diffusion blade.

[0011] As a further improvement of this utility model, the bottom of the regulating cylinder is provided with a drain port for discharging solid matter.

[0012] As a further embodiment of this utility model: the end of the stirring shaft extends axially to the outside of the regulating cylinder, and a driven gear is coaxially fixed at the end of the stirring shaft located outside the regulating cylinder. A drive motor is provided on the regulating cylinder, and a driving gear is coaxially fixed on the motor shaft of the drive motor. The driving gear and the driven gear mesh and transmit power.

[0013] As a further embodiment of this utility model: the stirring shaft is open at one end outside the regulating cylinder, and the opening is connected to the medicine tank through a medicine delivery pipe, with the stirring shaft and the medicine delivery pipe coaxially rotating.

[0014] As a further improvement of this invention, it also includes a backwasher, the backwashing pipeline of which is connected to the membrane bioreactor and the membrane module outlet in the reverse osmosis unit for backwashing cleaning.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The regulating cylinder of this utility model integrates crushing, lifting, stirring, reagent diffusion and filtration functions. It crushes large suspended solids and fibrous materials through crushing blades, and then forms forced circulation through lifting impeller to avoid sludge deposition. Finally, the diffusion blades achieve uniform dispersion of the reagent. Through multi-stage synergistic effect, the reaction efficiency between the reagent and pollutants is improved and the pollution load of the subsequent membrane system is reduced.

[0017] 2. This utility model uses a hollow stirring shaft and diffuser blades to add the agent, allowing the agent to diffuse directly and evenly from inside the reactor, avoiding uneven mixing and the formation of flocculant clumps, thus effectively saving the amount of agent used; the agent is released through the diffuser holes on the diffuser blades, which effectively increases the contact area with wastewater and results in excellent mixing effect.

[0018] 3. The filter disc of this utility model achieves preliminary solid-liquid separation in the pretreatment stage, intercepting most of the conditioned solid matter and facilitating its subsequent discharge through the bottom drain port, thereby further reducing the fouling rate of the membrane module during subsequent treatment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the adjusting cylinder in this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of this utility model.

[0021] In the picture:

[0022] 1. Adjusting cylinder; 11. Stirring shaft; 111. Lifting impeller; 112. Crushing blade;

[0023] 113. Diffusion blade; 1131. Distribution hole; 1132. Diffusion hole; 114. Agent channel;

[0024] 12. Feed inlet; 13. Discharge outlet; 14. Sewage outlet; 15. Chemical tank; 16. Chemical delivery pipe;

[0025] 17. Filter disc; 18. Drive motor; 181. Drive gear; 182. Driven gear;

[0026] 2. Membrane bioreactor; 3. Oxidation tank; 4. Reverse osmosis unit; 5. Disinfection tank; 6. Mixing tank;

[0027] 7. Storage tank; 8. Backwasher. Detailed Implementation

[0028] 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.

[0029] Please see Figures 1-2 In this embodiment of the present invention, a wastewater deep treatment device includes an regulating cylinder 1, a membrane bioreactor 2, an oxidation tank 3, a reverse osmosis unit 4, a disinfection tank 5, a mixing tank 6, and a storage tank 7 connected sequentially along the wastewater flow direction.

[0030] The regulating cylinder 1 is a vertical cylindrical reactor. A feed inlet 12 is radially arranged at the bottom of the cylinder for introducing wastewater to be treated. A discharge outlet 13 is radially arranged at the top of the cylinder for discharging the pretreated supernatant. A sludge outlet 14 is also provided at the bottom of the cylinder, arranged opposite to the feed inlet 12. The sludge outlet 14 is preferably controlled by an electric or pneumatic valve for periodically discharging high-concentration solids that have settled at the bottom.

[0031] An agitator shaft 11 is provided axially from top to bottom in the regulating cylinder 1. The agitator shaft is powered by an external drive motor 18. A drive gear 181 is fixed on the motor shaft of the drive motor 18, and a driven gear 182 is fixed at one end of the agitator shaft 11 extending outside the cylinder. The agitator shaft 11 is driven to rotate through gear meshing.

[0032] The stirring shaft 11 is a hollow shaft with an open end located outside the regulating cylinder 1. An axially oriented reagent channel 114 is formed inside the shaft. Its open end is connected to the reagent tank 15 via a reagent delivery pipe 16. A mechanical seal or a high-pressure rotary joint is used between the reagent delivery pipe 16 and the rotating stirring shaft 11 to achieve dynamic sealing and coaxial rotation, ensuring continuous injection of reagent into the stirring shaft 11 without leakage.

[0033] Along the axial direction of the stirring shaft 11, a number of diffuser blades 113, a set of lifting impellers 111 and a set of crushing blades 112 are fixedly arranged from top to bottom.

[0034] The crushing blade 112 is located at the bottom of the stirring shaft 11, near the feed inlet 12, and is used to mechanically crush larger suspended solids, fibers or clumps in the wastewater, breaking them down into smaller particles to increase their reaction area with the reagent.

[0035] The lifting impeller 111 is located above the crushing blade 112 and is arranged in close contact with the crushing blade 112. This close contact arrangement allows the crushed material to be immediately captured by the lifting impeller 111 and conveyed upwards, forming a forced circulation flow field inside the cylinder. This effectively prevents solid particles from depositing at the bottom, ensuring that the solid-liquid mixture is always in a uniform suspension state, thus allowing for full contact with the reagent.

[0036] Multiple sets of diffuser blades 113 are arranged at different heights of the stirring shaft 11. Each diffuser blade 113 has an internal cavity. Corresponding to the position of each diffuser blade 113, a distribution hole 1131 is radially formed on the stirring shaft 11, connecting the agent channel 114 inside the stirring shaft 11 with the internal cavity of the diffuser blade 113. At the same time, diffuser holes 1132 are uniformly formed on the surface of the diffuser blade 113, and these diffuser holes are connected to the internal cavity of the blade, thereby ejecting the agent jet under the action of centrifugal force.

[0037] The reagent is pumped from the reagent tank 15 into the reagent channel 114 inside the rotating stirring shaft 11 via the reagent delivery pipe 16. Under the action of centrifugal force and hydraulic pressure, the reagent enters the internal cavity of each diffuser blade 113 through the distribution hole 1131. Finally, it is diffused directly and uniformly into the entire reactor cavity from the inside of the blade in the form of an extremely fine jet through the uniformly distributed diffuser holes 1132. This achieves efficient and uniform mixing of the reagent and wastewater, avoids local overdose of the reagent, and saves the amount of reagent used.

[0038] A filter disc 17 is horizontally arranged inside the regulating cylinder 1, and the filter disc 17 is positioned close to the bottom of the discharge port 13. The outer edge of the filter disc 17 is fixedly connected to the cylinder wall of the regulating cylinder 1, and its center is coaxially rotated with the rotating stirring shaft 11 through bearings or seals. The filter disc 17 has micropores, the diameter of which can be selected according to the quality of the water to be treated, for solid-liquid separation of the mixture. The supernatant after filtration passes through the filter disc 17 and is discharged from the discharge port 13 to enter the subsequent treatment unit. Solids are trapped below the filter disc 17 and are finally discharged from the drain port 14.

[0039] The pretreated water discharged from regulating tank 1 enters membrane bioreactor 2 for biodegradation to remove organic matter and ammonia nitrogen. Membrane bioreactor 2 is preferably an MBR reactor. Oxidation tank 3 is equipped with an ozone or ultraviolet catalytic oxidation device to degrade recalcitrant trace organic matter in the effluent from membrane bioreactor 2. Reverse osmosis (RO) desalinates the oxidized water through the RO membrane to remove residual pollutants. The water then enters disinfection tank 5, where ultraviolet light or sodium hypochlorite is used to sterilize and disinfect the RO permeate. After disinfection, the water enters equalization tank 6, where a small amount of minerals is added and the pH is adjusted to stabilize its chemical properties. Finally, it is transferred to storage tank 7 for storage and later use.

[0040] The backwasher 8 is connected via valves to the permeate outlets of both the MBR and RO membrane modules. When the system detects membrane fouling leading to increased transmembrane pressure, the backwashing process can be initiated automatically or manually. The backwasher 8 pumps water or specialized cleaning solution back into the membrane module, powerfully flushing it to remove the fouling layer, restore membrane flux, and ensure long-term stable system operation.

[0041] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0042] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

Claims

1. A wastewater deep treatment device, characterized in that, The system includes a regulating cylinder (1) for filtering wastewater after conditioning with chemicals. The discharge port (13) of the regulating cylinder (1) is connected in sequence to the membrane bioreactor (2), oxidation tank (3), reverse osmosis unit (4), disinfection tank (5), mixing tank (6) and storage tank (7) to form a wastewater treatment system. The regulating cylinder (1) is provided with a feed inlet (12) at its bottom and a discharge outlet (13) at its top. The regulating cylinder (1) is provided with a stirring shaft (11) driven to rotate by a power source along the axial direction. The stirring shaft (11) is provided with diffuser blades (113) at different heights. The diffuser blades (113) have cavities inside. The diffuser blades (113) have diffuser holes (1132) that communicate with the cavities inside the diffuser blades (113) evenly. The stirring shaft (11) has a drug channel (114) along the axial direction. The stirring shaft (11) has a distribution hole (1131) that communicates with the cavities inside the diffuser blades (113) along the radial direction.

2. The wastewater deep treatment device according to claim 1, characterized in that, The end of the stirring shaft (11) adjacent to the feed inlet (12) is provided with a crushing blade (112). Along the axial direction of the stirring shaft (11), from top to bottom, the crushing blade (112), the lifting impeller (111), and each diffuser blade (113) are arranged in sequence.

3. The wastewater deep treatment device according to claim 2, characterized in that, The broken blade (112) and the lifting impeller (111) are arranged in close contact.

4. A wastewater deep treatment device according to any one of claims 1 to 3, characterized in that, The regulating cylinder (1) has a filter plate (17) horizontally arranged inside and fixed to the cylinder wall. The filter plate (17) and the stirring shaft (11) are coaxially rotated together. The filter plate (17) is located between the discharge port (13) and the top diffuser blade (113).

5. A wastewater deep treatment device according to any one of claims 1 to 3, characterized in that, The bottom of the regulating cylinder (1) is provided with a drain outlet (14) for discharging solids.

6. A wastewater deep treatment device according to any one of claims 1 to 3, characterized in that, The end of the stirring shaft (11) extends axially to the outside of the regulating cylinder (1), and a driven gear (182) is coaxially fixed at one end of the stirring shaft (11) outside the regulating cylinder (1). A drive motor (18) is provided on the regulating cylinder (1), and a drive gear (181) is coaxially fixed on the motor shaft of the drive motor (18). The drive gear (181) meshes with the driven gear (182) for transmission.

7. The wastewater deep treatment device according to claim 6, characterized in that, The stirring shaft (11) is open at one end outside the regulating cylinder (1), and the opening is connected to the medicine tank (15) through the medicine delivery pipe (16). The stirring shaft (11) and the medicine delivery pipe (16) are coaxially rotated together.

8. A wastewater deep treatment device according to any one of claims 1 to 3, characterized in that, It also includes a backwasher (8), whose backwash line is connected to the membrane module outlet in the membrane bioreactor (2) and the reverse osmosis unit (4) for backwashing cleaning.

Images