Urban domestic sewage treatment device

Abstract

This invention relates to the field of wastewater treatment technology, and more particularly to an urban domestic wastewater treatment device including a treatment pump station. The top of the outer arc surface of the treatment pump station is provided with a flange inlet, and the bottom of the inner arc surface of the treatment pump station near the flange inlet is connected to a conical flow guide plate. The upper surface of the conical flow guide plate is provided with an inlet in the middle. The conical flow guide plate is a double-layered structure with an arched end inside. Through a special structural design, the water flow is guided to form a slow flow state, providing sufficient reaction time for the coalescence of tiny oil droplets. This promotes the fusion of emulsified oil droplets and dispersed oil droplets to form large oil droplets. Utilizing the physical property that the density of oil is less than that of water, the oil droplets can naturally float to the surface and form a stable floating oil layer. The entire oil-water separation process does not require additional power and can be completed solely by gravity, effectively improving the oil-water separation efficiency while reducing the energy consumption and maintenance costs of the device.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an urban domestic wastewater treatment device. Background Technology

[0002] In urban domestic sewage, grease and fibrous impurities are among the most widespread pollutants and have the most significant impact on subsequent treatment processes. Grease mainly comes from residential kitchen wastewater, floating oil and emulsified oil discharged from the catering industry, as well as saponified grease carried by washing wastewater. Fiber impurities mainly include hair, paper towel scraps, clothing fibers, and vegetable fibers, which are widely present in residential washing, kitchen drainage, and public service sewage. Currently, the pretreatment stage of existing urban domestic sewage treatment devices generally suffers from insufficient removal of grease and fibers, which has become one of the core bottlenecks restricting sewage treatment efficiency, causing frequent failures in subsequent processes, and making it difficult to consistently meet effluent quality standards.

[0003] Chinese patent application CN202511104264.6 discloses an urban domestic sewage treatment device, including a tank. An inlet is fixedly connected to the outside of the tank, and a gate is movably connected inside the inlet. A steel pipe is fixedly connected inside the tank, and a filter box is fixedly connected to the outside of the steel pipe. A filter plate is fixedly connected to the outside of the filter box. A feeding port is opened on the outside of the tank, and a storage tank is opened inside the tank. A drive motor is fixedly connected inside the storage tank. A support shell is fixedly connected inside the tank, and a bevel gear set and a drive shaft are movably connected inside the support shell. An impeller on a rotating rod rotates. During the rotation of the impeller, the sewage reacts more rapidly with the sewage treatment agent, making the chemical reaction more complete, thereby achieving rapid purification and disinfection and improving work efficiency.

[0004] However, the filter plate of this device can only achieve the most basic solid-liquid separation. It does not have a dedicated separation mechanism for oily pollutants and cannot effectively remove floating oil, emulsified oil and dispersed oil from sewage. Such oils are easy to coat the surface of sewage treatment agents, forming a barrier layer, which seriously hinders the full contact between the agent and the sewage, resulting in reduced chemical reaction efficiency and greatly reduced purification and disinfection effect. In addition, if the oil that is not removed is directly discharged with the effluent, it can easily cause eutrophication of water bodies and damage the aquatic ecological environment. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to propose an urban domestic sewage treatment device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The system includes a treatment pump station. The top of the outer arc surface of the treatment pump station is provided with a flange inlet. A conical flow guide plate is connected to the bottom of the inner arc surface of the treatment pump station near the flange inlet. An inlet is located in the middle of the upper surface of the conical flow guide plate. The conical flow guide plate is a double-layered structure, with an arched end inside. A lower cup filter body is connected to the conical flow guide plate via a threaded section on its lower surface. The upper surface of the lower cup filter body is provided with a threaded section, which is threaded to the conical flow guide plate. A straight drain pipe is located in the middle of the inner arc surface of the lower cup filter body. An interception cavity exists between the straight drain pipe and the top conical flow guide plate. An annular leak core is fitted onto the inner arc surface of the interception cavity.

[0007] Preferably, the top of the arched end is provided with an arc-shaped ball head, and there is a gap between the arc-shaped ball head and the top water inlet, and the lower surface of the conical flow guide plate is provided with a threaded section.

[0008] Preferably, a water-flowing cavity is formed between the arched end and the conical guide plate, a filter hole is formed on the inner arc surface of the arched end, a partition is provided at the bottom of the inner arc surface of the water-flowing cavity, and the bottom annular leakage core and the top arched end are in the same plane.

[0009] Preferably, the upper surface of the annular leaking core is provided with an upper segment, and the lower surface of the annular leaking core is provided with a lower segment, and the upper segment and the lower segment are placed in a cross arrangement.

[0010] Preferably, the annular leak core is placed on the top surface of the middle drain pipe, the bottom surface of the drain pipe is provided with a water passage section, the inner arc surface of the water passage section is provided with an inward concave bend, a filling cavity is opened between the inward concave bend and the water passage section, and one end of the filling cavity extends into the interior of the drain pipe.

[0011] Preferably, the lower cup filter body has a pointed tip in the middle of its inner bottom, the pointed tip is placed at the bottom of the drain pipe, and the lower cup filter body and the drain pipe are provided with a drain cavity.

[0012] Preferably, the upper surface of the lower cup filter body is provided with water holes, the drainage cavity is in communication with the water holes, a separation pipe is connected through one side of the interception cavity at the top of the lower cup filter body, and a spherical floating net is sleeved on the inner arc surface of the drain straight pipe.

[0013] Preferably, the inner arc surface of the spherical floating net is fitted with granular biochemical balls, and the spherical floating net floats up and down inside the straight drain pipe and contacts the annular leakage core at the top.

[0014] Preferably, an electrostatic adsorption mesh is fixedly connected to the lower surface of the lower cup filter body, and the surface of the electrostatic adsorption mesh is provided with adsorption holes. The electrostatic adsorption mesh is disposed inside the drainage cavity.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Through a special structural design, the water flow is guided to form a slow flow state, providing sufficient reaction time for the coalescence of tiny oil droplets. This promotes the fusion of emulsified oil droplets and dispersed oil droplets to form large oil droplets. Utilizing the physical property that oil density is less than that of water, the oil droplets can naturally float to the surface and form a stable floating oil layer. The entire oil-water separation process does not require additional power and can be completed solely by gravity. This effectively improves the oil-water separation efficiency while reducing the energy consumption and maintenance costs of the device.

[0016] 2. Relying on a gradient physical interception and deep purification structure, it can intercept and separate pollutants such as large particulate impurities, emulsified oil droplets, and colloidal particles in wastewater in stages. The primary interception structure can effectively block large particulate impurities and prevent them from impacting downstream treatment components. The secondary filtration structure can intercept tiny fibers and colloidal particles, while promoting the collision and aggregation of tiny oil droplets. The deep purification structure can capture residual fine pollutants, improve the quality of effluent, and solve the problem of removing fine pollutants by traditional treatment devices.

[0017] 3. The water flow buffer and pressure stabilization structure can guide the water flow to produce a turbulent initial flow followed by a gentler flow, reducing the water flow velocity and preventing high-speed water flow from causing impact wear or displacement deformation to the biochemical treatment components, thus extending their service life. At the same time, the stable flow pattern can provide a good environment for the biochemical degradation reaction, ensuring that the bacteria and sewage are in full contact, improving the degradation efficiency of organic pollutants, and avoiding the problem of unstable treatment effect caused by water flow fluctuations.

[0018] 4. By combining physical oil-water separation with biochemical degradation, the physical structure can effectively reduce the pollutant load of the biochemical treatment unit, while the biochemical degradation process can decompose emulsified oil and organic pollutants that are difficult to remove by physical means. The two methods work together to further improve the overall wastewater treatment effect, while reducing the limitations that may exist in a single treatment method. Attached Figure Description

[0019] Figure 1 This is a top view schematic diagram of the overall cup filter structure of an urban domestic sewage treatment device proposed in this invention; Figure 2 This is a partial cross-sectional view of the conical flow guide plate of an urban domestic sewage treatment device proposed in this invention; Figure 3 This is a schematic diagram of the overall multi-stage filtration structure of an urban domestic sewage treatment device proposed in this invention; Figure 4 This is a schematic diagram of the annular core structure of an urban domestic sewage treatment device proposed in this invention; Figure 5 This is a top view of an urban domestic sewage treatment device proposed in this invention; Figure 6 This is a cross-sectional view of the concave bend of an urban domestic sewage treatment device proposed in this invention. Figure 7 This is a schematic diagram of the overall plan view of an urban domestic sewage treatment device proposed in this invention. Figure 8 This is a cross-sectional view of the internal structure of the treatment pump station of an urban domestic sewage treatment device proposed in this invention.

[0020] In the diagram: 1. Treatment pump station; 2. Flange inlet pipe; 3. Conical baffle plate; 31. Arched end; 32. Arc-shaped ball head; 33. Water flow chamber; 34. Filter holes; 35. Baffle plate; 4. Lower cup filter body; 41. Straight drain pipe; 411. Water pipe section; 412. Concave bend; 413. Filling cavity; 42. Towards the tip; 43. Drainage chamber; 44. Water hole; 5. Interception cavity; 6. Annular leak core; 61. Upper segment; 62. Lower segment; 7. Separation tube; 8. Spherical floating net; 81. Granular biochemical ball; 9. Electrostatic adsorption net; 91. Adsorption pore. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0023] Reference Figures 1-8A municipal sewage treatment device includes a treatment pump station 1. The top of the outer arc surface of the treatment pump station 1 is provided with a flange inlet 2. The bottom of the inner arc surface of the treatment pump station 1 near the flange inlet 2 is connected to a conical flow guide plate 3. The upper surface of the conical flow guide plate 3 is provided with an inlet in the middle. The conical flow guide plate 3 is configured with inner and outer double layers. The inside of the conical flow guide plate 3 is provided with an arched end 31. The conical flow guide plate 3 is connected to a lower cup filter body 4 through a threaded section on its lower surface. The upper surface of the lower cup filter body 4 is provided with a threaded section and is threadedly connected to the conical flow guide plate 3. The middle of the inner arc surface of the lower cup filter body 4 is provided with a straight drain pipe 41. There is an interception cavity 5 between the straight drain pipe 41 and the top conical flow guide plate 3. The inner arc surface of the interception cavity 5 is fitted with an annular leakage core 6.

[0024] The top of the arched end 31 is provided with an arc-shaped ball head 32. There is a gap between the arc-shaped ball head 32 and the water inlet at the top. The lower surface of the cone-shaped flow guide plate 3 is provided with a threaded section. A water flow cavity 33 is opened between the arched end 31 and the cone-shaped flow guide plate 3. A filter hole 34 is opened on the inner arc surface of the arched end 31. A baffle 35 is provided at the bottom of the inner arc surface of the water flow cavity 33. The baffle 35 and the filter hole 34 at the top are adapted to the direction of water flow. The annular leakage core 6 at the bottom is in the same plane as the arched end 31 at the top.

[0025] In the embodiment of the above technical solution, domestic sewage enters the device through the flange inlet 2 at the top of the outer arc surface of the treatment pump station 1. The water flow impacts the surface of the cone-shaped flow guide plate 3 at the bottom of the inner arc surface of the pump station in a free-fall manner. The cone-shaped flow guide plate 3 adopts a double-layer cone-shaped nested structure. The top of the arched end 31 of the inner layer is provided with an arc-shaped ball head 32. A gap is reserved between the ball head and the inlet in the middle of the upper surface of the cone-shaped flow guide plate 3.

[0026] When the water flow impacts the arc-shaped ball head 32, the arc-shaped surface of the ball head can disperse the concentrated water flow in all directions, avoiding excessive local water flow velocity from causing impact wear on the filter holes 34. At the same time, the double-layer conical structure guides the water flow to flow slowly downward along the conical surface, reducing the degree of water flow turbulence and creating a stable flow state for subsequent interception.

[0027] The dispersed water flows along the conical surface of the conical guide plate 3 and enters the water flow chamber 33 between the arched end 31 and the conical guide plate 3. The water flow chamber 33 is an annular flow channel, and filter holes 34 are opened on the surface of the arched end 31 at the top. The diameter of the filter holes 34 can be designed according to the interception volume. It can directly intercept large particles of impurities in the sewage with a particle size larger than the filter hole diameter, such as food residue, sand particles or large fiber clumps. The intercepted impurities slide down the conical surface of the arched end 31 to the bottom of the water flow chamber 33 under the action of gravity.

[0028] For some particulate impurities with a diameter slightly smaller than the filter hole 34 that enter the water flow chamber 33 with the water flow and settle downwards, the baffle 35 set at the bottom of the inner arc surface of the water flow chamber 33 forms a water flow direction matching channel with the top filter hole 34. That is, the installation angle of the baffle 35 is consistent with the flow direction of the water in the water flow chamber 33. This not only does not hinder the smooth flow of sewage, but also retains the settled particulate impurities at the bottom of the water flow chamber 33 through physical blocking, preventing such impurities from entering the downstream interception chamber 5, thus achieving a graded interception effect.

[0029] The preferred technical solution in this embodiment is: Reference Figure 1 , Figure 3 and Figure 4 The annular leaking core 6 has an upper petal segment 61 on its upper surface and a lower petal segment 62 on its lower surface. The upper petal segment 61 and the lower petal segment 62 are placed in a cross arrangement.

[0030] After the sewage guided by the water flow chamber 33 enters the interception chamber 5, it first flows through the annular filter core 6 sleeved on the inner arc surface of the interception chamber 5. The upper surface of the annular filter core 6 is provided with an upper petal segment 61 and the lower surface is provided with a lower petal segment 62. The upper and lower petals are placed in a cross-staggered manner to form a three-dimensional mesh filter structure. The filter gap of this cross-structure is small and evenly distributed, which can intercept small impurities such as colloidal particles that have not been removed in the sewage. At the same time, the "maze effect" of the cross structure can prolong the residence time of impurities on the surface of the filter core, increase the interception probability, and make up for the insufficient interception capacity of the filter hole 34 at the arched end 31 for small impurities.

[0031] The intersecting upper segment 61 and lower segment 62 change the flow state of sewage in the interception chamber 5. Untreated sewage flows vertically downwards. When it flows through the annular core 6, the water flow needs to go around the intersecting gaps between the upper and lower segments. The flow direction changes from vertical to a spiral slow flow along the surface of the core.

[0032] The core principle of this flow guiding effect is to reduce the water flow velocity, so that the water flow changes from a turbulent state to a laminar state. On the one hand, this avoids the high-speed water flow from scouring downstream components, and on the other hand, it provides sufficient reaction time for the coalescence of tiny oil droplets in the sewage. Under the spiral slow flow state, when the emulsified oil droplets and dispersed oil droplets in the sewage flow with the water flow through the staggered petal surfaces of the annular leak core 6, multiple collisions, adsorption and fusion will occur. There is an interfacial tension difference between the oil droplets and the petal surface, and the oil droplets are easily adsorbed onto the petal surface. After the oil droplets that flow through the leak come into contact with the adsorbed oil droplets, they fuse due to intermolecular forces to form oil droplets with larger particle sizes. At the same time, the spiral slow flow state gives the oil droplets enough time to complete the coalescence process.

[0033] The coalesced oil droplets, being much less dense than water, naturally float to the surface within the interception chamber 5 and eventually gather at the top of the chamber.

[0034] Reference Figure 3and Figure 6 The annular core 6 is placed on the top surface of the middle drain pipe 41. The bottom surface of the drain pipe 41 is provided with a water passage section 411. The middle of the inner arc surface of the water passage section 411 is provided with an inwardly concave bend 412. A filling cavity 413 is opened between the inwardly concave bend 412 and the water passage section 411. One end of the filling cavity 413 extends into the interior of the drain pipe 41. The middle section of the inner bottom of the lower cup filter body 4 is provided with a pointed tip 42. The pointed tip 42 is placed at the bottom of the drain pipe 41. A drain cavity 43 is provided between the lower cup filter body 4 and the drain pipe 41.

[0035] After being treated by the annular leak core 6, the sewage seeps downward into the interior of the straight drain pipe 41 in which the annular leak core 6 is placed. A water passage section 411 is provided on the bottom surface of the straight drain pipe 41, and an integrally formed concave bend 412 is formed in the middle of its inner wall. The cavity 413 formed between the concave bend 412 and the water passage section 411 has the core function of buffering and stabilizing pressure by utilizing the effect of the water flow being turbulent at the front and slow at the back, rather than controlling the water flow rate.

[0036] When water flows through the concave bend 412, the concave curved surface structure causes the water to expand afterward. That is, after the water flows through the narrow channel of the concave bend 412, it will naturally diffuse in the cavity 413, and the flow velocity of the water will be further reduced, forming a stable slow flow state. The cavity 413 serves as a space to accommodate the expansion of the water flow, and can receive the expanded water flow, preventing the water flow from generating turbulent vortices due to sudden diffusion.

[0037] First, it provides buffer protection. After expansion and deceleration, the water flow becomes smooth, effectively preventing high-speed water flow from directly impacting downstream biochemical treatment components such as the spherical floating net 8 and granular biochemical balls 81. This prevents the components from being worn, displaced, or deformed due to impact, extending their service life. Second, it stabilizes pressure and guides flow. After the cavity 413 receives the expanded water flow, it can form a uniform and stable flow pattern, avoiding problems such as insufficient biochemical reaction and unstable filtration effect caused by water flow fluctuations. This provides stable water flow conditions for the downstream oil flotation and biochemical co-treatment stage.

[0038] Reference Figure 7 The inner arc surface of the spherical floating net 8 is fitted with a granular biochemical ball 81. The spherical floating net 8 floats up and down inside the drain straight pipe 41 and contacts the annular leakage core 6 at the top. The lower surface of the lower cup filter body 4 is fixedly connected with an electrostatic adsorption net 9. The surface of the electrostatic adsorption net 9 is provided with adsorption holes 91. The electrostatic adsorption net 9 is set inside the drain cavity 43.

[0039] The spherical floating net 8 is internally fitted with granular biochemical balls 81. These biochemical balls contain porous ceramic particles and other fillers. The surface of the fillers is covered with highly efficient degrading bacteria. When sewage flows through the granular biochemical balls 81, the emulsified oil, dissolved oil, and some organic pollutants such as proteins and carbohydrates in the sewage are adsorbed by the bacteria on the surface of the fillers. The bacteria decompose the organic pollutants into harmless substances such as carbon dioxide and water through their own metabolic activities, while decomposing the emulsified oil into floating oil droplets.

[0040] The granular biochemical balls 81 move synchronously with the spherical floating net 8, allowing for full contact with the wastewater. Oil droplets aggregated by the annular filter core 6 and captured by the spherical floating net 8 continuously rise to the top of the straight drain pipe 41 and the top area of ​​the interception chamber 5, forming a stable oil layer at the top of the interception chamber 5. Below the oil layer is a water layer, with a clear oil-water interface. A separation pipe 7 is connected to one side of the interception chamber 5 at the top of the lower cup filter 4. The inlet of the separation pipe 7 is located within the oil layer height range, and the lower edge of the inlet is flush with the oil-water interface, ensuring that only... As wastewater continues to enter the device, the oil in the oil layer rises continuously, and the thickness of the oil layer increases accordingly. When the oil layer level is higher than the inlet height of the separation pipe 7, the oil will automatically flow into the separation pipe 7 under the drive of gravity level difference. Since the outlet end of the separation pipe 7 is lower than the oil layer level in the interception chamber 5, the oil flows out at a constant speed along the separation pipe 7 under the action of continuous level difference. Meanwhile, the water layer in the interception chamber 5 is always lower than the lower edge of the inlet of the separation pipe 7.

[0041] Reference Figure 5 , After biochemical co-treatment, the wastewater flows downward into the drainage chamber 43 inside the lower cup filter body 4. The bottom middle section of the lower cup filter body 4 is provided with a pointed tip 42. The pointed tip has a conical structure. The water-dividing effect of the conical structure disperses the concentrated water flow entering the lower cup filter body 4 in all directions, so that the wastewater flows evenly through the water holes 44 opened on the upper surface of the lower cup filter body 4. This avoids the local water flow velocity being too high, which would cause uneven load on the electrostatic adsorption net 9. It ensures that the wastewater is in full contact with the electrostatic adsorption net 9. The water holes 44 and the drainage chamber 43 are interconnected. The evenly dispersed wastewater enters the drainage chamber 43 through the water holes 44.

[0042] An electrostatic adsorption net 9 is installed inside the drainage chamber 43. The adsorption net adopts a metal mesh structure. When energized, it can form a high-intensity electrostatic field around the net. When sewage flows through the electrostatic adsorption net 9, the fine colloidal particles, emulsified oil droplets, microfibers and other impurities remaining in the sewage undergo polarization under the action of the electrostatic field. The charged impurities are adsorbed into the adsorption holes 91 on the surface of the adsorption net. At the same time, the electrostatic field can destroy the double electric layer structure of the emulsified oil, causing the emulsified oil droplets to coalesce into large oil droplets. The large oil droplets float to the surface due to buoyancy, further improving the oil removal efficiency.

[0043] Reference Figure 8An electrostatic adsorption mesh 9 is fixedly connected to the lower surface of the lower cup filter body 4. The surface of the electrostatic adsorption mesh 9 has adsorption holes 91. The electrostatic adsorption mesh 9 is set inside the drainage chamber 43. The positive and negative electrode pins of the electrostatic adsorption mesh 9 pass through the sealed wiring port on the side wall of the lower cup filter body 4 through waterproof insulated cables and are connected to an external low-voltage DC power supply module. The output voltage of the power supply module can be adaptively adjusted within the range of 12V-36V, and the output current matches the rated working parameters of the electrostatic adsorption mesh 9 to meet the adsorption requirements of fine impurities under different water qualities.

[0044] Large particles of impurities intercepted by the filter holes 34 at the arched end 31 slide down along the conical surface of the arched end 31 under the action of gravity and are temporarily stored at the bottom of the water flow chamber 33. The particles of impurities that sink to the bottom blocked by the baffle 35 cannot pass over the baffle 35 due to their own gravity and accumulate on the front side of the baffle 35 in the water flow chamber 33, forming a stable temporary storage layer. The fine fibers and coalesced oil droplets trapped by the annular core 6 are partially attached to the interlaced gaps of the core and temporarily stored, while some float to the top of the interception chamber 5 due to density differences, forming a floating oil layer. The floating oil and fibers captured by the spherical floating net 8 are adsorbed and temporarily stored by the porous structure of the floating net, and will not fall off to the downstream as the floating net floats up and down. Fine impurities adsorbed by the electrostatic adsorption mesh 9 adhere firmly to the surface of the adsorption pores 91 under the action of electrostatic attraction. The conical flow guide plate 3 is threadedly connected to the lower cup filter body 4. Maintenance personnel can periodically open the port and discharge the temporarily stored impurities by manual cleaning or backwashing to ensure that the filtration, adsorption, and degradation performance of each component is not affected, and to achieve long-term stable operation of the device.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A municipal wastewater treatment device, comprising: The treatment pump station (1) is characterized in that a flange water inlet (2) is provided on the top of the outer arc surface of the treatment pump station (1), and a cone-shaped flow guide plate (3) is connected to the bottom of the inner arc surface of the treatment pump station (1) near the flange water inlet (2). The upper surface of the cone-shaped flow guide plate (3) is provided with an inlet. The cone-shaped flow guide plate (3) is provided with inner and outer double layers. The inside of the cone-shaped flow guide plate (3) is provided with an arched end (31). The cone-shaped flow guide plate (3) is connected to the lower cup filter body (4) through the threaded section of the lower surface. The upper surface of the lower cup filter body (4) is provided with a threaded section and is threadedly connected to the conical flow guide plate (3). The lower cup filter body (4) has a drain straight pipe (41) in the middle of its inner arc surface. The drain straight pipe (41) and the top conical flow guide plate (3) are connected to an interception cavity (5). The inner arc surface of the interception cavity (5) is fitted with an annular leakage core (6).

2. The urban domestic sewage treatment device according to claim 1, characterized in that, The top of the arched end (31) is provided with an arc-shaped ball head (32), and there is a gap between the arc-shaped ball head (32) and the top water inlet. The lower surface of the cone-shaped flow guide plate (3) is provided with a threaded section.

3. The urban domestic sewage treatment device according to claim 2, characterized in that, A water-flowing cavity (33) is provided between the arched end (31) and the conical guide plate (3). A filter hole (34) is provided on the inner arc surface of the arched end (31). A partition plate (35) is provided at the bottom of the inner arc surface of the water-flowing cavity (33). The bottom annular leakage core (6) and the top arched end (31) are in the same plane.

4. The urban domestic sewage treatment device according to claim 1, characterized in that, The annular leak core (6) has an upper petal segment (61) on its upper surface and a lower petal segment (62) on its lower surface. The upper petal segment (61) and the lower petal segment (62) are placed in a cross-shaped arrangement.

5. A municipal sewage treatment device according to claim 4, characterized in that, The annular core (6) is placed on the top surface of the middle drain pipe (41). The bottom surface of the drain pipe (41) is provided with a water passage section (411). The middle part of the inner arc surface of the water passage section (411) is provided with an inwardly concave bend (412). A cavity (413) is opened between the inwardly concave bend (412) and the water passage section (411). One end of the cavity (413) extends into the interior of the drain pipe (41).

6. A municipal sewage treatment device according to claim 1, characterized in that, The lower cup filter body (4) has a pointed tip (42) in the middle of its inner bottom. The pointed tip (42) is placed at the bottom of the drain pipe (41). The lower cup filter body (4) and the drain pipe (41) are provided with a drain cavity (43).

7. A municipal sewage treatment device according to claim 1, characterized in that, The upper surface of the lower cup filter body (4) is provided with water holes (44), the drainage cavity (43) is connected to the water holes (44), a separation pipe (7) is connected through one side of the top interception cavity (5) of the lower cup filter body (4), and a spherical floating net (8) is sleeved on the inner arc surface of the drain straight pipe (41).

8. A municipal sewage treatment device according to claim 7, characterized in that, The inner arc surface of the spherical floating net (8) is fitted with granular biochemical balls (81). The spherical floating net (8) floats up and down inside the drain straight pipe (41) and contacts the annular leakage core (6) at the top.

9. A municipal sewage treatment device according to claim 6, characterized in that, The lower surface of the lower cup filter (4) is fixedly connected to an electrostatic adsorption mesh (9), and the surface of the electrostatic adsorption mesh (9) is provided with adsorption holes (91). The electrostatic adsorption mesh (9) is located inside the drain cavity (43).

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