Water conservancy project sewage resource graded purification and recovery device

Abstract

The invention relates to the technical field of sewage purification, and provides a hydraulic engineering sewage resource graded purification and recovery device which comprises a flocculation box and further comprises a primary filter box, a slag discharge box, a liquid conveying bent pipe, a centrifugal power assembly and a clear liquid discharge pipe, the primary filter box is arranged on the flocculation box through a primary filter frame, and a filter plate is arranged in the primary filter box; a residue scraping assembly is arranged on the filtering plate, the residue discharging box is arranged on one side of the primary filtering box in a communicating mode, a residue discharging opening and closing assembly is arranged on the side, away from the primary filtering box, of the residue discharging box, one end of the liquid conveying bent pipe is arranged at the bottom of the primary filtering box in a communicating mode, the other end of the liquid conveying bent pipe is arranged on the lower portion of the flocculation box in a communicating mode, and a flocculant filling assembly is arranged on the liquid conveying bent pipe. According to the technical scheme, the problems of poor flocculation efficiency and low continuous energy of the sewage purification and recovery device in the prior art when the sewage purification and recovery device treats sewage with large particle size difference and high particle size content in the flocculation and subsequent solid-liquid separation stages are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage purification, in particular, to a sewage resourceization grading purification and recovery device for water conservancy projects. BACKGROUND

[0002] With the rapid development of economic society, water resource shortage and water environment pollution problems are increasingly prominent. As an important part of national infrastructure, water conservancy projects will produce a large amount of sewage in its construction, operation and surrounding regional production and life. How to efficiently and energy-savingly purify and recycle these sewage has great significance for protecting water ecological environment, alleviating water resource supply and demand contradiction and promoting sustainable development.

[0003] At present, sewage purification and recovery devices have been widely applied in water conservancy projects, municipal drainage, industrial wastewater treatment and other fields. The conventional sewage purification and recovery device usually includes core components such as grating, sedimentation tank, flocculation reaction unit, solid-liquid separation unit and depth filtration unit. The basic process flow is as follows: sewage first removes large floating objects through grating, then enters the sedimentation tank for preliminary settlement, then adds flocculant in the flocculation reaction unit to make the small suspended particles and colloidal substances in the water unstable, agglomerate and form larger flocculation bodies, finally, these flocculation bodies are separated from the water by sedimentation, air flotation or filtration, so as to obtain clean water after purification.

[0004] In the above process, flocculation and subsequent solid-liquid separation are the key links to determine the purification effect and efficiency. However, in actual application, the existing technology often lacks effective classification of impurity particles in the water before the sewage enters the flocculation unit. The impurity particle size distribution in the sewage is very wide, containing a large amount of suspended large particles and a large amount of colloidal fine particles. If these large particle substances directly enter the flocculation link, not only a large amount of flocculant will be consumed, increasing the operation cost, but also the effective contact and bridging of flocculant and fine particles will be disturbed, resulting in uneven size, loose structure and poor settling performance of the formed flocculation body, which seriously affects the flocculation effect. For the flocculated sewage, the traditional treatment method mainly relies on gravity sedimentation or mechanical pressure filtration. Although the gravity sedimentation method has low energy consumption, it needs long sedimentation time and large occupation area, and the treatment efficiency cannot meet the demand of large water volume or continuous operation. If mechanical pressure filtration such as plate and frame pressure filtration is used, although the separation speed can be accelerated, the equipment is complex, the investment is high, the energy consumption is large, and it is usually operated intermittently. When treating large-scale and continuous sewage, there is a bottleneck in treatment capacity, and the operation and maintenance cost is high. SUMMARY

[0005] The application provides a water conservancy project sewage resourceization grading purification and recovery device to solve the problem of low flocculation efficiency and continuous ability when treating sewage with large particle size difference and high particle size content in the flocculation and subsequent solid-liquid separation stages of the existing sewage purification and recovery device.

[0006] The technical scheme of the application is as follows: a water conservancy project sewage resourceization grading purification and recovery device, comprising a flocculation tank, an initial filtration tank, a residue discharge tank, a liquid conveying elbow, a centrifugal power assembly and a clear liquid discharge pipe; The initial filtration tank is arranged on the flocculation tank through an initial filtration frame, a filter plate is arranged in the initial filtration tank, and a residue scraping assembly is arranged on the filter plate; The residue discharge tank is arranged on one side of the initial filtration tank in communication, and a residue discharging opening and closing assembly is arranged on the side, away from the initial filtration tank, of the residue discharge tank; One end of the liquid conveying elbow is arranged at the bottom of the initial filtration tank in communication, the other end is arranged at the lower part of the flocculation tank in communication, and a flocculant filling assembly is arranged on the liquid conveying elbow; The centrifugal power assembly is arranged in the flocculation tank; The clear liquid discharge pipe is arranged on one side of the upper part of the flocculation tank in communication.

[0007] On the basis of the foregoing scheme, the residue scraping assembly comprises a residue scraping motor, a residue scraping shaft and a residue scraping plate; The residue scraping motor is mounted on the initial filtration tank; The residue scraping shaft is arranged on the filter plate in penetration and rotation, one end of the residue scraping shaft is connected with the output end of the residue scraping motor, and the other end penetrates into the liquid conveying elbow; The residue scraping plate is arranged on the residue scraping shaft, and the bottom of the residue scraping plate is in contact with the upper surface of the filter plate.

[0008] On the basis of the foregoing scheme, the upper surface of the filter plate is arranged in a concave shape, and a plurality of conical filter holes are formed in the filter plate.

[0009] On the basis of the foregoing scheme, the residue discharging opening and closing assembly comprises a residue discharging cylinder and a residue plugging block; The residue discharging cylinder is mounted on the residue discharge tank; The residue plugging block is arranged on the output end of the residue discharging cylinder, one end of the residue plugging block can extend to the side, away from the initial filtration tank, of the residue discharge tank and is in sealing contact with the residue discharge tank.

[0010] Further, a spiral liquid discharging fan blade is arranged on the residue scraping shaft, the spiral liquid discharging fan blade is located in the liquid conveying elbow and is in contact with the inner wall of the liquid conveying elbow.

[0011] On the basis of the foregoing scheme, the flocculant filling assembly comprises a Venturi tube and a filler tube; The Venturi tube is in communication with the liquid inlet elbow; The filler tube is in communication with the throat of the Venturi tube.

[0012] On the basis of the foregoing scheme, the centrifugal power assembly comprises a centrifugal motor, a centrifugal disc and a centrifugal shaft; The centrifugal motor is installed on the flocculation tank; The centrifugal disc is rotatably arranged on the inner top wall of the flocculation tank, and the output end of the centrifugal motor is connected with one end of the centrifugal disc; The centrifugal shaft is arranged at an eccentric position of the centrifugal disc, and the centrifugal shaft is located in the flocculation tank.

[0013] On the basis of the foregoing scheme, the bottom of the flocculation tank is provided with a flocculation discharge gate valve, which can discharge the flocculation in the flocculation tank.

[0014] On the basis of the foregoing scheme, a flow meter is installed on the liquid inlet elbow, which can monitor the total amount of sewage entering the flocculation tank.

[0015] On the basis of the foregoing scheme, the primary filter tank is also in communication with a water inlet pipe for connecting the raw sewage to be treated.

[0016] The beneficial effects of the present application are: 1、In the present application, by arranging a primary filter tank with a filter plate upstream of the flocculation tank, large particles in the water can be effectively intercepted and separated before the sewage enters the flocculation tank. This pre-treatment measure can avoid a large amount of suspended large particles directly entering the flocculation link, which not only significantly reduces the invalid consumption of flocculants and reduces the operating cost, but more importantly, ensures that the flocculants can more fully and efficiently contact and bridge with residual fine particles and colloidal substances in the water, thereby forming flocculation bodies with more compact structure, more uniform particle size and better settling performance, and fundamentally improving the flocculation effect; 2、In the present application, a centrifugal power assembly is arranged in the flocculation tank, which utilizes the centrifugal force field generated by the rotation of the centrifugal disc and the centrifugal shaft at the eccentric position to replace the traditional gravity sedimentation. This dynamic separation method can greatly accelerate the separation speed of the flocculation body and the clear liquid, significantly shorten the hydraulic retention time, and thus greatly improve the processing efficiency and continuous operation capacity of the unit device, effectively overcome the bottleneck of large occupation area and low processing efficiency of the gravity sedimentation method, and avoid the shortcomings of complex equipment, high energy consumption and intermittent operation of the plate and frame filter press, and is more suitable for large-scale and continuous sewage treatment requirements in the field of water conservancy engineering; 3. In this invention, the automatic scraping and centralized discharge of filter residue in the primary filtration stage can be achieved by setting up the slag scraping component, filter plate and slag discharge opening and closing component, reducing the frequency and labor intensity of manual cleaning. The flocculant filling component set on the infusion bend can automatically draw in and mix the flocculant by utilizing the fluid's own kinetic energy, simplifying the dosing system. The flow meter facilitates accurate monitoring and process control. These designs together improve the automation level, ease of operation and stability of the device, and reduce daily maintenance and operation management costs. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional structural schematic diagram of the present invention; Figure 3 For the present invention Figure 2 A magnified schematic diagram of the local structure at point A; Figure 4 For the present invention Figure 2 A magnified view of the structure at point B in the middle; Figure 5 For the present invention Figure 2 A magnified schematic diagram of the local structure at point C; Figure 6 This is a partial cross-sectional structural diagram showing the cooperation of the primary filter box, water supply pipe, filter plate, slag discharge box, slag scraping assembly, and slag discharge opening and closing assembly in this invention.

[0019] In the diagram: 001, slag scraping assembly; 002, slag discharge opening and closing assembly; 003, flocculant filling assembly; 004, centrifugal power assembly; 1. Flocculation box; 2. Primary filter box; 3. Primary filter frame; 4. Filter plate; 5. Slag discharge box; 6. Liquid delivery bend; 7. Clear liquid discharge pipe; 8. Slag scraper motor; 9. Slag scraper shaft; 10. Slag scraper plate; 11. Conical filter hole; 12. Slag discharge cylinder; 13. Slag discharge sealing block; 14. Spiral liquid discharge fan blade; 15. Venturi tube; 16. Packing tube; 17. Centrifugal motor; 18. Centrifugal disc; 19. Centrifugal shaft; 20. Flow meter; 21. Water delivery pipe. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] Examples, such as Figures 1 to 6 As shown in the figure, this embodiment proposes a graded purification and recycling device for wastewater resource utilization in water conservancy projects, including a flocculation box 1, a primary filter box 2, a slag discharge box 5, a liquid conveying bend 6, a centrifugal power component 004, and a clear liquid discharge pipe 7.

[0022] As described above, the primary filter box 2 is set on the flocculation box 1 through the primary filter frame 3, forming a compact vertical structure that effectively saves floor space. The primary filter box 2 is connected to the water supply pipe 21 to receive the raw sewage to be treated. The primary filter box 2 is equipped with a filter plate 4, and the upper surface of the filter plate 4 is concave to facilitate the collection of filter residue and sewage. The filter plate 4 is provided with several conical filter holes 11, with the larger opening of the conical hole facing down and the smaller opening facing up. This structure can effectively prevent particulate impurities from clogging the filter holes and achieve precise screening of larger suspended particles (such as silt, plant debris, etc.).

[0023] In order to automatically remove the filter residue accumulated on the filter plate 4, a scraping assembly 001 is provided on the filter plate 4. The scraping assembly 001 includes a scraping motor 8, a scraping shaft 9, and a scraping plate 10. The scraping motor 8 is installed on the primary filter box 2. The scraping shaft 9 is rotatably mounted on the filter plate 4. One end of the scraping shaft 9 is connected to the output end of the scraping motor 8, and the other end passes through the infusion bend 6. The scraping plate 10 is mounted on the scraping shaft 9, and the bottom of the scraping plate 10 is in contact with the upper surface of the filter plate 4.

[0024] The scraper plate 10 is rod-shaped or arm-shaped. When the scraper motor 8 is started, the output end of the scraper motor 8 can drive the scraper shaft 9 to rotate. The rotation of the scraper shaft 9 can drive the scraper plate 10 to rotate. Through the rotation of the scraper plate 10, the filter residue on the filter plate 4 can be scraped to the edge.

[0025] By connecting the slag discharge box 5 to one side of the primary filter box 2, it can be used to collect the filter slag scraped by the slag scraper 10. A slag discharge opening and closing assembly 002 is provided on the side of the slag discharge box 5 away from the primary filter box 2 for periodically discharging the filter slag. The slag discharge opening and closing assembly 002 includes a slag discharge cylinder 12, such as a cylinder or hydraulic cylinder, and a slag discharge sealing block 13. The slag discharge cylinder 12 is installed on the slag discharge box 5, and the slag discharge sealing block 13 is located on the output end of the slag discharge cylinder 12. One end of the slag discharge sealing block 13 can extend to the side of the slag discharge box 5 away from the primary filter box 2 and make a sealed contact with the slag discharge box 5.

[0026] Specifically, in the normal working state, the discharge blocking block 13 is driven to shrink at the output end of the discharge cylinder 12, sealing the discharge port of the discharge box 5; when the discharge is needed, the discharge cylinder 12 ejects the piston rod to drive the discharge blocking block 13 to move, so that the discharge blocking block 13 is separated from the discharge box 5, thereby opening the discharge port, and the filtered residue is discharged under the action of gravity or water flow, and the discharged filtered residue can be collected and treated by setting a flow guide plate at the bottom of the discharge box 5.

[0027] The above-mentioned one end of the infusion bend pipe 6 is communicated and arranged at the bottom of the primary filter box 2, and the other end is communicated and arranged at the lower part of the flocculation tank 1, and the infusion bend pipe 6 is provided with a flocculant filling assembly 003; the sewage filtered by the primary filter box 2 can flow into the flocculation tank 1 through the infusion bend pipe 6 communicated between the bottom of the primary filter box 2 and the lower part of the flocculation tank 1; a flowmeter 20 is installed on the infusion bend pipe 6, which is used for real-time monitoring and metering the sewage flow into the flocculation tank 1, and providing data support for process control.

[0028] In addition, the spiral liquid discharge fan blade 14 is further arranged on the residue scraping shaft 9, which is located in the infusion bend pipe 6 and in contact with the inner wall of the infusion bend pipe 6. The core function is that when the residue scraping motor 8 drives the residue scraping shaft 9 to rotate in a specific direction, such as clockwise, the spiral liquid discharge fan blade 14 rotates synchronously, and the spiral structure can produce pumping effect, which can actively and stably transport the sewage at the bottom of the primary filter box 2 to the flocculation tank 1 in a controllable manner. Therefore, by controlling the forward rotation, reverse rotation, rotation speed and running time of the output end of the residue scraping motor 8, the rotation direction, speed and working time of the spiral liquid discharge fan blade 14 can be accurately controlled, and the instantaneous flow and cumulative capacity of the sewage in the primary filter box 2 into the infusion bend pipe 6 can be flexibly adjusted, so as to realize accurate matching and linkage control with the subsequent flocculation process.

[0029] The continuous rotation of the spiral liquid discharge fan blade 14 can effectively prevent the flocculant or fine particles from depositing in the infusion bend pipe 6, and keep the pipeline unobstructed.

[0030] The above-mentioned flocculant filling assembly 003 includes a Venturi tube 15 and a filler pipe 16. The Venturi tube 15 is communicated and arranged on the infusion bend pipe 6, and the filler pipe 16 is communicated and arranged on the throat of the Venturi tube 15. Specifically, the Venturi tube 15 is connected in series in the infusion bend pipe 6, the filler pipe 16 is communicated at the throat position of the Venturi tube 15, and the other end of the filler pipe 16 is connected to the external flocculant storage tank. When the sewage flows through the throat of the Venturi tube 15, the negative pressure is formed due to the increase of flow rate and the decrease of pressure, so that the flocculant solution can be automatically sucked into the pipeline through the filler pipe 16 and fully mixed with the sewage. This design does not need an additional dosing pump, which is energy-saving and efficient.

[0031] The centrifugal power assembly 004 is arranged in the flocculation tank 1, and the centrifugal power assembly 004 comprises a centrifugal motor 17, a centrifugal disc 18 and a centrifugal shaft 19. The centrifugal motor 17 is arranged on the flocculation tank 1, the centrifugal disc 18 is arranged on the inner top wall of the flocculation tank 1 in a rotating mode, the output end of the centrifugal motor 17 is connected with one end of the centrifugal disc 18, and the centrifugal shaft 19 is arranged at an eccentric position of the centrifugal disc 18 and located in the flocculation tank 1.

[0032] The core working principle and the essential difference from the prior art are that the rotation of the output end of the centrifugal motor 17 can drive the centrifugal disc 18 and the centrifugal shaft 19 to rotate at a low and controllable speed. The rotation speed of the centrifugal shaft 19 can be adjusted according to the size of the flocculation tank 1 and the content of the flocculation. The low-speed rotation of the centrifugal shaft 19 will not produce strong shear force to disperse the formed flocculation. The slow and gentle eccentric rotation can generate a slight inertial force field in the body, gently guide the flocculation with a larger density to slowly move and converge to the central axis area of the flocculation tank 1, form a high-concentration flocculation core area, and the clean liquid with a smaller density is “displaced” to the vicinity of the peripheral wall of the flocculation tank 1, so as to realize rapid solid-liquid separation.

[0033] Based on the principle, a clean liquid discharge pipe 7 is connected to the upper peripheral wall of the flocculation tank 1, used for guiding the clean water converged to the pipe, and a flocculation discharge gate valve is arranged at the center of the conical bottom of the flocculation tank 1, used for periodically discharging the concentrated flocculation sludge converged in the central area.

[0034] The specific working process is as follows: Primary filtration and residue discharge: The raw sewage enters the primary filter tank 2 through the water conveying pipe 21, is screened by the concave filter plate 4, and the large-particle impurities are intercepted on the filter plate 4. The filtered water enters the lower part of the tank through the conical filter hole 11, and the residue is scraped into the residue discharge tank 5 by the rotation of the residue scraping plate 10 driven by the activated residue scraping motor 8. When the residue accumulated in the residue discharge tank 5 reaches a certain amount, the residue discharge opening opening and closing assembly 002 is actuated to open the residue discharge opening.

[0035] Quantitative water conveying and automatic dosing: The control system instructs the residue scraping motor 8 to operate at a specific speed and direction according to the preset program, drives the spiral liquid discharging fan blade 14 to pump the quantitative filtered water to the flocculation tank 1 through the liquid conveying elbow pipe 6, and the flow rate data is fed back in real time through the flowmeter 20 to form a closed loop control. When the water flow passes through the Venturi tube 15, the flocculant is automatically sucked in to complete the dosing.

[0036] Flocculation and dynamic mild separation: after the sewage mixed with flocculant enters the flocculation tank 1, the centrifugal power assembly 004 is started to run in low speed mode, and the eccentric rotating centrifugal shaft 19 generates a mild force field to promote the flocculation body to gather, grow and settle in the central shaft area of the flocculation tank 1, and at the same time forces the clear liquid to move to the peripheral wall area.

[0037] Water recovery and sludge discharge: the clear liquid gathered near the peripheral wall of the flocculation tank 1 is discharged and recovered through the clear liquid discharge pipe 7, and the concentrated flocculation sludge gathered in the center and bottom of the flocculation tank 1 is periodically discharged through the flocculation discharge gate valve.

[0038] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A water conservancy sewage resource utilization grading purification and recovery device, comprising a flocculation tank (1), characterized in that, Also include: The primary filter box (2) is arranged on the flocculation tank (1) through the primary filter frame (3), the filter plate (4) is arranged in the primary filter box (2), the filter plate (4) is provided with a slag scraping assembly (001); The slag discharge box (5) is communicated on one side of the primary filter box (2), and the slag discharge box (5) is provided with a slag discharge opening and closing assembly (002) away from the primary filter box (2); The liquid transfer elbow (6) is communicated on one end of the bottom of the primary filter box (2) and the other end of the lower part of the flocculation tank (1), and the liquid transfer elbow (6) is provided with a flocculating agent filling assembly (003); The centrifugal power assembly (004) is arranged in the flocculation tank (1); The clear liquid discharge pipe (7) is communicated on one side of the upper part of the flocculation tank (1).

2. The device according to claim 1, characterized in that, The slag scraping assembly (001) comprises: The slag scraping motor (8) is installed on the primary filter box (2); The slag scraping shaft (9) is arranged on the filter plate (4), one end of the slag scraping shaft (9) is connected with the output end of the slag scraping motor (8), and the other end penetrates into the liquid transfer elbow (6); The slag scraping plate (10) is arranged on the slag scraping shaft (9), and the bottom of the slag scraping plate (10) is in contact with the upper surface of the filter plate (4).

3. The device according to claim 2, characterized in that, The upper surface of the filter plate (4) is concave, and a plurality of conical filter holes (11) are formed in the filter plate (4).

4. The device according to claim 3, characterized in that, The slag discharge opening and closing assembly (002) comprises: The slag discharge cylinder (12) is installed on the slag discharge box (5); The slag discharge cylinder (12) is installed on the slag discharge box (5); 5. The device according to claim 4, characterized in that, The spiral liquid discharge fan blade (14) is arranged on the slag scraping shaft (9), and the spiral liquid discharge fan blade (14) is located in the liquid transfer elbow (6) and in contact with the inner wall of the liquid transfer elbow (6).

6. The device according to claim 5, characterized in that, The flocculating agent filling assembly (003) comprises: The Venturi tube (15) is communicated on the liquid transfer elbow (6); The filler pipe (16) is communicated on the throat pipe of the Venturi tube (15).

7. The device according to claim 6, characterized in that, The centrifugal power assembly (004) comprises: The centrifugal motor (17) is installed on the flocculation tank (1); The centrifugal disc (18) is rotatably arranged on the inner top wall of the flocculation tank (1), and the output end of the centrifugal motor (17) is connected with one end of the centrifugal disc (18); The centrifugal shaft (19) is arranged at the eccentric position of the centrifugal disc (18), and the centrifugal shaft (19) is located in the flocculation tank (1).

8. The device according to claim 7, characterized in that, The bottom of the flocculation tank (1) is provided with a flocculation discharge gate valve, which can discharge the flocculation in the flocculation tank (1).

9. The device according to claim 8, characterized in that, The liquid transfer elbow (6) is provided with a flow meter (20), which can monitor the total amount of sewage entering the flocculation tank (1).

10. The device according to claim 9, characterized in that, The primary filter box (2) is also communicated with a water inlet pipe (21) for connecting the raw sewage to be treated.

Images