Double-filler mud membrane coupling system for enhancing nitrogen and phosphorus removal

Abstract

The utility model provides a double-filler mud membrane coupling system for enhancing nitrogen and phosphorus removal, and belongs to the technical field of sewage treatment. The double-filler mud membrane coupling system comprises a sedimentation tank module, a water inlet barrel, a filter, a biological tank, a water outlet barrel and a dosing module, the water inlet end of the water inlet barrel is used for inputting wastewater to be treated, the water outlet end of the water inlet barrel is connected with the water inlet end of the filter, the water inlet end of the biological tank is connected with the water outlet end of the filter, and the water outlet end of the biological tank is connected with the sedimentation tank module. The water outlet end of the sedimentation tank is connected with the water outlet bucket, a stirrer, an aeration mechanism and a filler module are arranged in the biological tank, and the dosing module is connected with the biological tank. The double-filler mud-membrane coupling system not only can enhance the removal of ammonia nitrogen, total nitrogen and refractory organic matters in wastewater, but also is green and economical.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and specifically relates to a dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal. Background Technology

[0002] Currently, local standards have imposed stricter requirements on pollutant emissions from wastewater treatment plants (facilities), especially for nitrogen and phosphorus levels. At present, urban wastewater treatment plants typically enhance nitrogen and phosphorus removal by adding treatment units and chemical agents, which inevitably increases investment and operating costs. Therefore, developing a wastewater treatment system that can enhance nitrogen and phosphorus removal while being green and economical is of great significance. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal, which can enhance the removal of ammonia nitrogen, total nitrogen and recalcitrant organic matter from wastewater.

[0004] The objective of this utility model can be achieved through the following technical solution: A dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal includes a sedimentation tank, an inlet tank, a filter, a biological tank, an outlet tank, and a dosing module. The inlet end of the inlet tank is used to input wastewater to be treated. The outlet end of the inlet tank is connected to the inlet end of the filter. The inlet end of the biological tank is connected to the outlet end of the filter. The outlet end of the biological tank is connected to the sedimentation tank. The outlet end of the sedimentation tank is connected to the outlet tank. The biological tank is equipped with a stirrer, an aeration mechanism, and a filler module. The dosing module is connected to the biological tank.

[0005] Preferably, the biological tank is composed of several biological sections connected in sequence, each biological section forming a separate reactor. The biological section at the end is connected to the biological section at the front end through an internal reflux pipe to achieve internal reflux. The sedimentation tank and the biological section at the front end are connected through an external reflux pipe.

[0006] Preferably, the biological tank comprises seven biological sections, wherein biological section one is an anaerobic section, biological sections two and three are anoxic sections, and biological sections four through seven are aerobic sections. Biological sections one, two, and three are each connected to the outlet of a filter via an inlet; biological sections two through seven are each connected to the preceding biological section via an inlet; biological section one is connected to an inner return pipe and an outer return pipe via a return inlet; biological sections two and three are each connected to an inner return pipe via a return inlet; biological section three is connected to biological section six via a bypass pipe equipped with a bypass valve; biological sections five and seven are each connected to an inner return pipe via a return outlet; and biological section seven is connected to a sedimentation tank via an outlet.

[0007] Preferably, the stirrer is installed in biological sections one through seven.

[0008] Preferably, the aeration mechanism is located in biological section three to biological section seven. The aeration mechanism includes an aeration disc and a blower connected to the aeration disc via an aeration pipe. An aeration valve is provided on the aeration pipe.

[0009] Preferably, the packing module includes: iron-carbon packing balls disposed in biological section one and polyurethane packing blocks disposed in biological section two and biological section three; a fixed frame is provided on the surface of biological section one, the fixed frame has positioning holes, and several iron-carbon packing balls are suspended in the positioning holes after being connected in series by steel wires; the polyurethane packing blocks are directly suspended in biological section two and biological section three.

[0010] Preferably, the iron-carbon filler ball is composed of a polypropylene hollow filler ball and iron-carbon small balls embedded in the polypropylene hollow filler ball. The size of the iron-carbon small ball is 8-12mm, and the size of the polypropylene hollow filler ball is 4-6cm. The polyurethane filler block has a cubic structure and a size of 1.5-2cm.

[0011] Preferably, the dosing module includes: a sodium acetate dosing unit connected to biological segment two and biological segment three respectively, and a PAC dosing unit connected to biological segment seven.

[0012] Preferably, the surfaces of the second and third biological sections are each equipped with an ultrasonic generator.

[0013] Preferably, a guide tube is provided above the middle part of the sedimentation tank, and the guide tube is connected to the inlet of the sedimentation tank. A trumpet-shaped baffle is provided below the guide tube. A ring of inclined plates is provided in the middle layer of the sedimentation tank. A sludge scraper is provided at the bottom of the sedimentation tank, and a sludge hopper is provided below the sludge scraper. The sludge hopper is connected to an external return pipe. A branch is provided on the external return pipe as a sludge discharge pipe. A sludge pump is provided on the external return pipe. An overflow weir is provided around the upper layer of the sedimentation tank. The supernatant in the sedimentation tank flows out of the sedimentation tank through the overflow weir and enters the effluent tank.

[0014] Compared with existing technologies, this enhanced nitrogen and phosphorus removal dual-filler mud-film coupling system has the following advantages: multi-point water inlet, multi-point internal recirculation, and the setting of bypass pipes allow for independent parameter control of each biological section of the system / multi-section combined parameter control; the system operates in a green and low-carbon manner, and the use of iron-carbon and polyurethane dual fillers can reduce the amount of wastewater treatment agents used and improve the removal efficiency of total phosphorus, total nitrogen, and organic matter. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal in the embodiment.

[0016] Figure 2 This is a schematic diagram of the main structure of biological segment one and biological segment two in the embodiment.

[0017] Figure 3 This is a top view of the structure of biological segment one in the embodiment.

[0018] Figure 4 This is a schematic diagram of the fixing structure of the iron-carbon filler balls in the embodiment.

[0019] Figure 5 This is a cross-sectional view of biological segment two and biological segment three in the embodiment.

[0020] Figure 6 This is a schematic diagram of the installation of the ultrasonic generator in biological segment two and biological segment three in the embodiment.

[0021] Figure 7 This is a schematic diagram of the main structure of biological segments three to seven in the embodiment.

[0022] Figure 8 This is a schematic diagram of the sedimentation tank in the embodiment.

[0023] 1. Sedimentation tank; 2. Inlet tank; 3. Filter; 4. Biological tank; 4a. Biological section one; 4b. Biological section two; 4c. Biological section three; 4d. Biological section four; 4e. Biological section five; 4f. Biological section six; 4g. Biological section seven; 5. Outlet tank; 6. Agitator; 7. Aeration mechanism; 8. Flow pipe; 9. Vent valve; 10. Internal return pipe; 11. External return pipe; 12. Overpass pipe; 13. Overpass valve; 14. Iron-carbon packing balls; 15. Polyurethane packing blocks; 16. Sodium acetate dosing unit; 17. PAC dosing unit; 18. Fixing frame; 19. Positioning hole; 20. Steel wire; 21. Ultrasonic generator; 22. Flow guide tube; 23. Baffle plate; 24. Inclined plate; 25. Sludge scraper; 26. Sludge hopper; 27. Overflow weir. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figure 1As shown, the enhanced nitrogen and phosphorus removal dual-filler mud-film coupling system provided by this utility model includes a sedimentation tank 1, an inlet tank 2, a filter 3, a biological tank 4, an outlet tank 5, and a dosing module. The inlet end of the inlet tank 2 is used to input the wastewater to be treated. The outlet end of the inlet tank 2 is connected to the inlet end of the filter 3. The inlet end of the biological tank 4 is connected to the outlet end of the filter 3. The outlet end of the biological tank 4 is connected to the sedimentation tank 1. The outlet end of the sedimentation tank 1 is connected to the outlet tank 5. The biological tank 4 is equipped with a stirrer 6, an aeration mechanism 7, and a filler module. The dosing module is connected to the biological tank 4. In this embodiment, the filter 3 is a self-cleaning filter 3. The wastewater between the units can be pumped by a water pump. The use of a water pump is a conventional technology for transporting liquids, so it will not be described in detail. The system operates as follows: the wastewater to be treated output from the sewage treatment plant flows into the inlet tank 2 by gravity. The sewage in the inlet tank 2 is pumped into the filter 3 by a water pump. The filter 3 removes some particulate matter and larger floating objects. The effluent from the filter 3 enters the biological tank 4.

[0026] The biological tank 4 used in this embodiment has seven biological sections. The first three biological sections can be equipped with valves to distribute the influent flow and internal recirculation flow. Each biological section is connected by a flow pipe 8, using a bottom-in, top-out design to avoid hydraulic short-circuiting. Each biological section has an vent valve 9, and the function of each biological section can be flexibly adjusted. The following is in conjunction with the appendix... Figure 1 The structure of biological pond 4 is described in detail:

[0027] like Figure 2 , 7As shown, biological section 4a of biological tank 4 is the anaerobic section, biological sections 4b and 4c are the anoxic sections, and biological sections 4d-4g are the aerobic sections. Biological sections 4a, 4b, and 4c are each connected to the outlet of filter 3 through an inlet. Biological sections 4b-4g are each connected to the previous biological section through an inlet. Biological section 4a is connected to the inner return pipe 10 and the outer return pipe 11 through a return inlet. Biological sections 4b and 4c are each connected to the inner return pipe 10 through a return inlet. Biological section 4c is connected to biological section 4f through an overpass pipe 12, and an overpass valve 13 is installed on the overpass pipe 12. Biological sections 4e and 4g are each connected to the inner return pipe 10 through a return outlet. Biological section 4g is connected to the sedimentation tank module 1 through an outlet. Agitator 6 is installed in biological sections 1-4a to 7-4g; aeration mechanism 7 is installed in biological sections 3-4c to 7-4g, and includes an aeration disc and a blower connected to the aeration disc via an aeration pipe, with an aeration valve installed on the aeration pipe; the packing module includes: iron-carbon packing balls 14 installed in biological section 1-4a and polyurethane packing blocks 15 installed in biological sections 2-4b and 3-4c; the dosing module includes: sodium acetate dosing unit 16 connected to biological sections 2-4b and 3-4c respectively, and PAC dosing unit 17 connected to biological section 7-4g. It should be noted that the aeration mechanism 7 in biological sections 3-4c to 7-4g ​​can be turned on or off according to actual working needs, allowing biological sections 3-4c to 7-4g ​​to switch between anoxic and aerobic environments and to regulate dissolved oxygen levels, further increasing the flexibility and applicability of system control.

[0028] Combination Figure 3 , 4 In biological section 4a, an internal recirculation path can be formed from the recirculation of biological section 5 (4e) or 7, or an external recirculation path can be formed from the recirculation of sedimentation tank 1. A fixed frame 18 is installed inside biological section 4a, with positioning holes 19. Several iron-carbon packing balls 14 are connected in series by steel wires 20 and suspended in the positioning holes 19, thus achieving a fixed packing setup. The iron-carbon packing balls 14 are composed of hollow polypropylene packing balls and iron-carbon small balls embedded in the hollow polypropylene packing balls. The size of the iron-carbon small balls is 8-12 mm, and the size of the hollow polypropylene packing balls is 4-6 cm. As a preferred embodiment, the size of the hollow polypropylene packing balls is 5.5 cm. The agitator 6 of biological section 4a operates at a speed of 40 r / min, ensuring sufficient contact between the mixed liquid and the packing. The iron-carbon material in the iron-carbon packing balls 14 creates electron donors in the water, further promoting the reduction of nitrate nitrogen, reducing the impact of nitrate on the biological phosphorus removal process, and further optimizing the phosphorus removal effect.

[0029] Combination Figure 5, 6 The effluent from biological section 4a flows into biological section 2 (4b), which can also form an internal reflux path from biological section 5 (4e) or 7. The polyurethane packing blocks 15 added to biological section 2 (4b) are suspended in the mixed liquid. These polyurethane packing blocks 15 have a cubic structure and a size of 1.5-2 cm. The agitator 6 in biological section 2 (4b) operates at 60 r / min to ensure uniform mixing of the packing and activated sludge. A set of ultrasonic generators 21 is also installed on the surface of biological section 2 (4b). Intermittent low-frequency ultrasonic waves eliminate air bubbles in the floating polyurethane packing, preventing packing accumulation on the surface. Simultaneously, it promotes the shedding of the biofilm from the polyurethane packing, promotes sludge granulation, and improves sludge settling performance. Biological section 2 (4b) also has a sodium acetate dosing port, which connects to the sodium acetate dosing unit 16 for dosing replenishment.

[0030] Reference Figure 5 , 6 The effluent from biological section 2 (4b) enters biological section 3 (4c). The polyurethane packing blocks 15 added to biological section 3 (4c) are the same as those in biological section 2 (4b), so their structure will not be described in detail. Since biological section 3 (4c) is equipped with a bypass pipe 12 leading to biological section 6 (4f), the bypass valve 13 can be opened directly during wastewater treatment to allow the effluent from biological section 3 (4c) to directly enter biological section 6 (4f), while biological sections 4d and 5 (4e) are vented. Furthermore, a set of ultrasonic generators 21 is also installed on the surface of biological section 3 (4c), with the same function and principle as in biological section 2 (4b).

[0031] The polyurethane packing block 15 in the above-mentioned biological segment 4b and biological segment 4c is a porous medium, which can create a better hypoxic environment for the growth of microorganisms and has a certain adsorption effect on pollutants in the water.

[0032] Combination Figure 7 In the biological segment 4d-7g, dissolved oxygen was maintained in the range of 1.0-3.0mg / L by aeration with a blower.

[0033] The biological segment 7 4g is also equipped with a PAC dosing port, which can be used to replenish the drug through the PAC dosing unit 17.

[0034] Combination Figure 8For example, 4g of effluent from the biological stage 7 enters sedimentation tank 1 for sedimentation and sludge-water separation. Sedimentation tank 1 can have two units. Sedimentation tank 1 adopts a central inlet and peripheral outlet design. A guide tube 22 is installed above the center of sedimentation tank 1, connected to the inlet. Below the guide tube 22 is a funnel-shaped baffle 23. A ring of inclined plates 24 is installed in the middle layer of the tank to promote sludge sedimentation. A sludge scraper 25 is located at the bottom of sedimentation tank 1 to scrape the sludge into a sludge hopper 26 below. The sludge hopper 26 is connected to an external return pipe 11, which is equipped with a sludge pump and has branches for sludge discharge. The sludge is transported back to the biological tank 4 by the sludge pump and directly discharged from the system through the sludge discharge pipe, ensuring a stable concentration of activated sludge within the system. An overflow weir 27 surrounds the upper layer of sedimentation tank 1, through which the supernatant flows out of sedimentation tank 1 and into the effluent tank 5.

[0035] This invention employs two different types of packing materials working together, cleverly integrating fixed iron-carbon packing balls 14 and suspended polyurethane packing blocks 15. Utilizing the micro-electrolysis effect of the iron-carbon material, complex organic pollutants in wastewater are broken down, disintegrating stubborn molecular structures and fully decomposing the pollutants. The polyurethane packing blocks 15, with their large specific surface area and porosity, are fully suspended in the water, achieving efficient adsorption and deep capture of various residual pollutants, further purifying the wastewater. The specific embodiments described herein are merely illustrative examples of the spirit of this invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal, comprising a sedimentation tank (1), an inlet tank (2), a filter (3), a biological tank (4), an outlet tank (5), and a dosing module, characterized in that, The inlet end of the inlet tank (2) is used to input the wastewater to be treated. The outlet end of the inlet tank (2) is connected to the inlet end of the filter (3). The inlet end of the biological tank (4) is connected to the outlet end of the filter (3). The outlet end of the biological tank (4) is connected to the sedimentation tank (1). The outlet end of the sedimentation tank (1) is connected to the outlet tank (5). The biological tank (4) is equipped with a stirrer (6), an aeration mechanism (7) and a packing module. The dosing module is connected to the biological tank (4).

2. The dual-packer mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 1, characterized in that, The biological pool (4) is composed of several biological segments connected in sequence. Each biological segment constitutes a reactor. The biological segment at the end is connected to the biological segment at the front end through an internal reflux pipe (10) to achieve internal reflux. The sedimentation tank (1) and the biological segment at the front end are connected through an external reflux pipe (11).

3. The dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 2, characterized in that, The biological tank (4) comprises seven biological sections, wherein biological section one (4a) is an anaerobic section, biological sections two (4b) and three (4c) are anoxic sections, and biological sections four (4d) to seven (4g) are aerobic sections. Biological sections one (4a), two (4b), and three (4c) are each connected to the outlet of the filter (3) through an inlet. Biological sections two (4b) to seven (4g) are each connected to the preceding biological section through an inlet. Biological section one (4a) is connected to the previous biological section through a return inlet. The biological section 2 (4b) and biological section 3 (4c) are connected to the internal return pipe (10) and the external return pipe (11), respectively. The biological section 3 (4c) is connected to the biological section 6 (4f) through the bypass pipe (12), and the bypass pipe (12) is equipped with a bypass valve (13). The biological section 5 (4e) and biological section 7 (4g) are connected to the internal return pipe (10) through the return outlet. The biological section 7 (4g) is connected to the sedimentation tank (1) through the outlet.

4. The dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 3, characterized in that, The stirrer (6) is placed in biological segment one (4a) to biological segment seven (4g).

5. A dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 3 or 4, characterized in that, The aeration mechanism (7) is located in biological segment three (4c) to biological segment seven (4g). The aeration mechanism (7) includes an aeration disc and a blower connected to the aeration disc via an aeration pipe. An aeration valve is provided on the aeration pipe.

6. The dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 5, characterized in that, The packing module includes: iron-carbon packing balls (14) disposed in biological section one (4a) and polyurethane packing blocks (15) disposed in biological section two (4b) and biological section three (4c); a fixed frame (18) is provided in the pool of biological section one (4a), the fixed frame (18) has positioning holes (19), and several iron-carbon packing balls (14) are connected in series by steel wires (20) and suspended in the positioning holes (19); the polyurethane packing blocks (15) are directly suspended in biological section two (4b) and biological section three (4c).

7. The dual-packing mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 6, characterized in that, The iron-carbon filler ball (14) is composed of a polypropylene hollow filler ball and iron-carbon small balls embedded in the polypropylene hollow filler ball. The size of the iron-carbon small ball is 8-12mm, and the size of the polypropylene hollow filler ball is 4-6cm. The polyurethane filler block (15) has a cubic structure and a size of 1.5-2cm.

8. The dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 5, characterized in that, The dosing module includes: a sodium acetate dosing unit (16) connected to biological segment two (4b) and biological segment three (4c) respectively, and a PAC dosing unit (17) connected to biological segment seven (4g).

9. A dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 3 or 4, characterized in that, The surfaces of biological section two (4b) and biological section three (4c) are each equipped with an ultrasonic generator (21).

10. A dual-filler mud-film coupling system for enhanced nitrogen and phosphorus removal according to claim 2, 3, or 4, characterized in that, A guide tube (22) is provided above the middle part of the sedimentation tank (1). The guide tube (22) is connected to the inlet of the sedimentation tank (1). A horn-shaped baffle (23) is provided below the guide tube (22). A ring of inclined plates (24) is provided in the middle layer of the sedimentation tank (1). A sludge scraper (25) is provided at the bottom of the sedimentation tank (1). A sludge hopper (26) is provided below the sludge scraper (25). The sludge hopper (26) is connected to the external return pipe (11). A sludge pump is provided on the external return pipe (11). A branch is provided on the external return pipe (11) as a sludge discharge pipe. An overflow weir (27) is provided around the upper layer of the sedimentation tank (1). The supernatant in the sedimentation tank (1) flows out of the sedimentation tank (1) through the overflow weir (27) and enters the effluent bucket (5).

Images