Multi-stage filtering device for municipal sewage treatment

Abstract

The utility model relates to the technical field of sewage filtration, in particular to a multi-stage filtering device for municipal sewage treatment, which comprises an aeration tank, a secondary sedimentation tank arranged at the rear end of the aeration tank, and a disinfection tank arranged at the rear end of the secondary sedimentation tank, a defoaming tank is additionally arranged between the aeration tank and the secondary sedimentation tank and further comprises an outer tank wall, inner tank walls are arranged on the inner side of the outer tank wall at intervals, a defoaming roller is arranged on the outer side of the upper end of each inner tank wall, a plurality of pricking needles A are uniformly arranged on the outer side wall of each defoaming roller, the defoaming rollers rotate automatically under the impact of water flow, and the pricking needles A are used for pricking foam floating objects; the defoaming tank is additionally arranged between the aeration tank and the secondary sedimentation tank, so that automatic defoaming is realized, electric driving is not needed, manual intervention is reduced, and the sewage treatment cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater filtration technology, and in particular to a multi-stage filtration device for municipal wastewater treatment. Background Technology

[0002] Municipal wastewater treatment typically includes pretreatment, biochemical treatment, advanced treatment, sludge treatment, and resource utilization. Among these processes, aeration tanks generate a lot of foam due to the influence of microbial activity, chemical reactions, and gas release.

[0003] The large amount of floating foam generated in the wastewater biological treatment tank often carries sludge particles, destroying the floc structure and making it difficult to separate sludge and water in the secondary sedimentation tank. This results in excessive suspended solids in the effluent. At the same time, foam covering the liquid surface reduces aeration efficiency, leading to insufficient dissolved oxygen and affecting the microbial activity of subsequent biological treatment units. Existing defoaming methods generally involve adding defoaming agents or using surface scraping equipment. However, defoaming agents are easily diluted or sheared and decomposed in dynamic water flow, resulting in insufficient foam suppression persistence and requiring frequent replenishment, which increases production costs. Furthermore, surface scraping equipment not only requires continuous electric drive but also manual monitoring and regular maintenance, leading to high operating costs.

[0004] Therefore, this application provides a multi-stage filtration device for municipal wastewater treatment to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage filtration device for municipal wastewater treatment, which solves the problems of high cost in existing foam elimination methods.

[0006] To solve the above-mentioned technical problems, this utility model provides a multi-stage filtration device for municipal sewage treatment, including an aeration tank, a secondary sedimentation tank at the rear end of the aeration tank, and a disinfection tank at the rear end of the secondary sedimentation tank; an antifoaming tank is added between the aeration tank and the secondary sedimentation tank, the antifoaming tank also includes an outer tank wall, an inner tank wall is provided at intervals on the inner side of the outer tank wall, an antifoaming roller is provided on the outer side of the upper end of the inner tank wall, and a plurality of needles A are evenly arranged on the outer side wall of the antifoaming roller. The antifoaming roller rotates by the impact of water flow, and the needles A are used to puncture the floating foam.

[0007] A further improvement of the present invention is that: a number of defoaming needles are respectively provided on the upper part of the inner side of the outer pool wall, and a number of needles B are provided on the body of the defoaming needles.

[0008] A further improvement of the present invention is that the outer pool wall also includes a first outer pool wall, which is disposed on both sides and the rear end of the defoaming pool, and a second outer pool wall is disposed between the defoaming pool and the aeration pool, the height of the second outer pool wall being lower than that of the first outer pool wall.

[0009] A further improvement of the present invention is that: an inner pool wall is provided at intervals on the inner sides of the first outer pool wall and the second outer pool wall, and the inner pool wall also includes a vertical pool wall at the lower end, and a guide wall is provided at the top of the vertical pool wall. The height of the guide wall is lower than that of the second outer pool wall, and the guide wall is inclined inward at 15 to 30 degrees.

[0010] A further improvement of this utility model is that a semi-circular groove is horizontally provided on the outer side of the guide wall body, and defoaming rollers are arranged at intervals inside the groove, with the defoaming rollers protruding from the groove.

[0011] A further improvement of this utility model is that the defoaming roller has a cylindrical structure, and several arc grooves are provided on the outer arc wall of the defoaming roller body along the central axis. The depth of the arc grooves is 5%-8% of the diameter of the defoaming roller. The arc grooves are used to increase the driving force of the water flow on the defoaming roller.

[0012] A further improvement of this utility model is that: the two ends of the defoaming roller are respectively connected to one end of the support frame through bearings, and the other end of the support frame is fixed to the inner side wall of the outer pool wall.

[0013] A further improvement of this utility model is that the inner pool walls form a cubic inner pool, and the space between the guide wall and the outer pool wall is a defoaming cavity.

[0014] A further improvement of this utility model is that: several through holes are provided at the lower end of the vertical pool wall, and the through holes connect the defoaming chamber and the inner pool.

[0015] A further improvement of this utility model is that the aeration tank, defoaming tank, secondary sedimentation tank, and disinfection tank are connected in series via a water pumping pipe.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] 1. This utility model provides a multi-stage filtration device for municipal sewage treatment. The biological treatment tank is equipped with a defoaming tank at the rear end. The height difference between the biological treatment tank and the outer tank wall forms a natural overflow (similar to the weir effect). The water overflowing into the defoaming tank passes through a dual-stage defoaming mechanism of dynamic defoaming rollers and static defoaming needles, which breaks the surface tension of the foam and eliminates the foam. Its efficiency is more than 40% higher than that of the traditional scraper-type defoaming method. At the same time, when the water flow impacts the arc groove of the defoaming roller, its kinetic energy is converted into rotational mechanical energy, which drives the defoaming needles to move continuously, realizing the self-circulation of energy, without the need for external power input, and reducing the cost of sewage treatment.

[0018] 2. The present invention provides a multi-stage filtration device for municipal sewage treatment. The design of the inner pool wall tilting inward further optimizes the foam accumulation path and guides the foam layer to accumulate in the contact area of ​​the defoaming roller. The water overflowing from the aeration tank to the defoaming chamber continuously impacts the arc groove of the defoaming roller. Combined with the flow guiding structure of the outer pool wall, a stable water flow can be maintained to repeatedly flow through the defoaming roller. The through hole allows water to enter the inner pool area from the defoaming chamber. The water flow in the inner pool flows into the defoaming chamber from the top of the flow guiding wall, forming an internal and external circulating water flow that continuously breaks the foam.

[0019] 3. The present invention provides a multi-stage filtration device for municipal sewage treatment, wherein the outer pool wall is provided with a static brush needle array, and the fixed brush needles at the top of the outer pool wall repeatedly puncture the foam, which complements the blind spot of the dynamic defoaming roller in removing bubbles. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a multi-stage filtration device for municipal wastewater treatment.

[0022] Figure 2 for Figure 1 Front sectional view in the middle;

[0023] Figure 3 This is a cross-sectional view of the defoaming tank;

[0024] Figure 4 This is a magnified view of the defoaming needle;

[0025] Figure 5 This is a schematic diagram of the defoaming roller structure;

[0026] Figure 6 This is a top-down, enlarged view of a portion of the defoaming tank.

[0027] Reference numerals in the attached drawings: 1. Aeration tank; 2. Defoaming tank; 21. Outer tank wall; 211. First outer tank wall; 212. Second outer tank wall; 22. Inner tank wall; 221. Vertical tank wall; 2211. Through hole; 222. Guide wall; 2221. Groove; 23. Defoaming roller; 231. Needle A; 232. Arc groove; 24. Defoaming needle; 241. Needle B; 25. Support frame; 26. Inner tank; 27. Defoaming chamber; 3. Secondary sedimentation tank; 4. Disinfection tank; 5. Pumping pipe. 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] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The present invention will be further explained below with reference to specific embodiments.

[0031] like Figures 1-6As shown in the figure, this embodiment provides a multi-stage filtration device for municipal sewage treatment, including an aeration tank 1, a secondary sedimentation tank 3 at the rear end of the aeration tank 1, and a disinfection tank 4 at the rear end of the secondary sedimentation tank 3; an antifoaming tank 2 is added between the aeration tank 1 and the secondary sedimentation tank 3, the antifoaming tank 2 also includes an outer tank wall 21, an inner tank wall 22 is provided at intervals on the inner side of the outer tank wall 21, an antifoaming roller 23 is provided on the outer side of the upper end of the inner tank wall 22, and a plurality of needles A231 are evenly arranged on the outer side wall of the antifoaming roller 23. The antifoaming roller 23 rotates by the impact of water flow, and the needles A231 are used to puncture the floating foam. Specifically, due to biochemical reactions, a large amount of floating foam appears on the water surface in aeration tank 1. The foam-containing water in the upper layer of aeration tank 1 overflows into defoaming tank 2 through the second outer tank wall 212. The overflowing water passes through defoaming needles 24 and impacts defoaming rollers 23. The arc grooves 232 of defoaming rollers 23 convert the kinetic energy of the water into the mechanical energy of the rotation of defoaming rollers 23. The rotating defoaming rollers 23 drive their own needles A231 to continuously puncture and break the foam, continuously eliminating the foam. This achieves energy self-circulation and utilization, without the need for external power input, thus reducing the cost of sewage treatment.

[0032] like Figures 2-4 As shown, in this embodiment, several defoaming needles 24 are respectively provided on the upper inner side of the outer pool wall 21, and several piercing needles B241 are provided on the body of the defoaming needle 24. Specifically, the defoaming needles 24 are vertically arranged on the inner side of the outer pool wall 21. The defoaming needles 24 are conical in shape, and several piercing needles B241 of different sizes are provided on the body of the defoaming needle 24 to facilitate the piercing of foam in different directions. During the process of the foamy water flowing from the aeration tank 1 to the defoaming tank 2, some of the foam is first pierced by the defoaming needles 24 in conjunction with the piercing needles B241. The water enters the inner pool 26 area from the defoaming chamber 27, and the water flow in the inner pool 26 flows into the defoaming chamber 27 from the top of the guide wall 222, forming an internal and external circulating water flow, continuously piercing the foam and improving the foam elimination efficiency.

[0033] like Figures 1-3As shown, in this embodiment, the outer pool wall 21 further includes a first outer pool wall 211, which is disposed on both sides and the rear end of the defoaming pool 2. A second outer pool wall 212 is disposed between the defoaming pool 2 and the aeration pool 1, and the height of the second outer pool wall 212 is lower than that of the first outer pool wall 211. An inner pool wall 22 is disposed between the inner sides of the first outer pool wall 211 and the second outer pool wall 212. The inner pool wall 22 also includes a vertical pool wall 221 at its lower end. A guide wall 222 is disposed at the top of the vertical pool wall 221, and the height of the guide wall 222 is lower than that of the second outer pool wall 212. The guide wall 222 is inclined inward at 15-30°. The inner pool walls 22 enclose a cubic inner pool 26, and the space between the guide wall 222 and the outer pool wall 21 is a defoaming cavity 27. Specifically, the height of the second outer pool wall 212 is 1 / 6 lower than that of the first outer pool wall 211, which facilitates the overflow of foam-containing water in the upper layer of the aeration tank 1 through the second outer pool wall 212 into the defoaming chamber 27. The water in the defoaming chamber 27 flows into the inner pool 26 through the through hole 2211. The height of the guide wall 222 is 4 / 5 of that of the second outer pool wall 212, which facilitates the outward diffusion of water in the inner pool 26 through the top of the guide wall 222 into the defoaming chamber 27, realizing the internal and external circulation of water in the inner pool 26 and the defoaming chamber 27, continuously breaking the foam. The distance between the inner pool wall 22 and the outer pool wall 21 is 1 / 8 of the width of the defoaming tank 2. The guide wall 222 is inclined inward at 20°, which optimizes the foam accumulation path and can guide the foam layer to accumulate within the defoaming chamber 27.

[0034] like Figure 3 , Figure 5 , Figure 6 As shown, in this embodiment, a semi-circular groove 2221 is horizontally arranged on the outer side of the guide wall 222 body. Defoaming rollers 23 are spaced apart within the groove 2221, protruding from the groove 2221. The defoaming rollers 23 have a near-cylindrical structure, and several arc grooves 232 are arranged along the central axis on the outer arc wall of the defoaming roller 23 body. The depth of the arc grooves 232 is 5%-8% of the diameter of the defoaming roller 23. The arc grooves 232 are used to increase the driving force of the water flow on the defoaming rollers 23. Both ends of the defoaming rollers 23 are respectively connected to one end of the support frame 25 via bearings, providing support. The other end of the frame 25 is fixed to the inner side wall of the outer pool wall 21. Specifically, the defoaming roller 23 protrudes from the groove 2221, which facilitates the overflowing water flow to impact the body of the defoaming roller 23. The depth of the arc groove 232 is 6% of the diameter of the defoaming roller 23. The arc groove 232 can increase the force-bearing area of ​​the defoaming roller 23. At the same time, the two ends of the defoaming roller 23 are nested with bearings (not shown in the figure), which facilitates the defoaming roller 23 to rotate on its own under the action of water force. The rotating defoaming roller 23 drives its own needles A231 to continuously puncture and break the foam, and continuously eliminate the foam.

[0035] like Figures 2-3As shown, in this embodiment, several through holes 2211 are provided at the lower end of the vertical pool wall 221, and the through holes 2211 connect the defoaming chamber 27 and the inner pool 26; the aeration pool 1, the defoaming pool 2, the secondary sedimentation pool 3 and the disinfection pool 4 are connected in series through the water pumping pipe 5; specifically, 3 to 5 through holes 2211 are provided at the lower end of the vertical pool wall 221, and the diameter of the through holes 2211 is 100mm, which facilitates the free flow of water between the inner pool 26 and the defoaming chamber 27. At the same time, the water pumping pipe 5 can continuously pump foam-free water from the middle of the inner pool 26 to the secondary sedimentation pool 3. In the secondary sedimentation pool 3, the water undergoes natural sedimentation to achieve a clear mud-water interface and the overall settling of flocs. The settled water is then pumped to the disinfection pool 4 through the water pumping pipe 5, and after chemical disinfection, it meets the discharge standards.

[0036] This utility model provides the working principle of a multi-stage filtration device for municipal sewage treatment: After pretreatment (physical filtration), municipal sewage is pumped to aeration tank 1. Due to biochemical reactions, a large amount of floating foam appears on the water surface in aeration tank 1. The foam-containing water in the upper layer of aeration tank 1 overflows into defoaming tank 2 through the second outer tank wall 212. The overflowing water passes through defoaming needles 24 and impacts defoaming rollers 23, overflowing into defoaming chamber 27. The arc grooves 232 of defoaming rollers 23 convert the kinetic energy of the water into the mechanical energy of the rotation of defoaming rollers 23. The rotating defoaming rollers 23 drive their own needles A231 to continuously puncture the foam film, destroy the surface tension, puncture and break the foam, and continuously eliminate the foam. The water in defoaming chamber 27 flows into inner tank 26 through through holes 2211. The water in inner tank 26 diffuses outward through the top of guide wall 222 to defoaming chamber 27, realizing the internal and external circulation of water between inner tank 26 and defoaming chamber 27, continuously puncturing the foam.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-stage filtering device for municipal sewage treatment, characterized by, The system includes an aeration tank (1), a secondary sedimentation tank (3) at the rear end of the aeration tank (1), and a disinfection tank (4) at the rear end of the secondary sedimentation tank (3). A defoaming tank (2) is added between the aeration tank (1) and the secondary sedimentation tank (3). The defoaming tank (2) also includes an outer tank wall (21). An inner tank wall (22) is provided at intervals on the inner side of the outer tank wall (21). A defoaming roller (23) is provided on the outer side of the upper end of the inner tank wall (22). Several needles A are evenly arranged on the outer side wall of the defoaming roller (23). (231), the defoaming roller (23) rotates by the impact of the water flow, and the needle A (231) is used to puncture the foam floating on the water flow.

2. The multi-stage filtering device for municipal sewage treatment according to claim 1, characterized in that, Several defoaming needles (24) are respectively provided on the upper inner side of the outer pool wall (21), and several needles B (241) are provided on the body of the defoaming needles (24).

3. The multi-stage filtering device for municipal sewage treatment according to claim 1, characterized in that, The outer pool wall (21) also includes a first outer pool wall (211), which is located on both sides and the rear end of the defoaming pool (2). A second outer pool wall (212) is located between the defoaming pool (2) and the aeration pool (1), and the height of the second outer pool wall (212) is lower than that of the first outer pool wall (211).

4. The multi-stage filtering device for municipal sewage treatment according to claim 3, characterized in that, Inner pool walls (22) are provided at intervals on the inner sides of the first outer pool wall (211) and the second outer pool wall (212). The inner pool wall (22) also includes a vertical pool wall (221) at the lower end. A guide wall (222) is provided at the top of the vertical pool wall (221). The height of the guide wall (222) is lower than that of the second outer pool wall (212). The guide wall (222) is inclined inward at 15 to 30 degrees.

5. The multi-stage filtering device for municipal sewage treatment according to claim 4, characterized in that, A semi-circular groove (2221) is horizontally provided on the outer side of the guide wall (222). Defoaming rollers (23) are provided at intervals inside the groove (2221), and the defoaming rollers (23) protrude from the groove (2221).

6. The multi-stage filtering device for municipal sewage treatment according to claim 1, characterized in that, The defoaming roller (23) has a cylindrical structure. Several arc grooves (232) are provided on the outer arc wall of the defoaming roller (23) body along the central axis. The depth of the arc grooves (232) is 5%-8% of the diameter of the defoaming roller (23). The arc grooves (232) are used to increase the driving force of the water flow on the defoaming roller (23).

7. The multi-stage filtering device for municipal sewage treatment according to claim 6, characterized in that, The two ends of the defoaming roller (23) are respectively connected to one end of the support frame (25) through bearings, and the other end of the support frame (25) is fixed to the inner side wall of the outer pool wall (21).

8. The multi-stage filtering device for municipal sewage treatment according to claim 1, characterized in that, The inner pool wall (22) forms a cubic inner pool (26), and the space between the flow guide wall (222) and the outer pool wall (21) is a defoaming cavity (27).

9. The multi-stage filtering device for municipal sewage treatment according to claim 4, characterized in that, Several through holes (2211) are provided at the lower end of the vertical pool wall (221), and the through holes (2211) connect the defoaming chamber (27) and the inner pool (26).

10. The multi-stage filtration device for municipal sewage treatment according to claim 1, characterized by The aeration tank (1), defoaming tank (2), secondary sedimentation tank (3) and disinfection tank (4) are connected in series through a water pumping pipe (5).

Images