Rain sewage rapid treatment device and application method thereof

Abstract

The invention provides a rain sewage rapid treatment device which comprises a sewage discharge pipe, a first contraction part is arranged in the middle of the sewage discharge pipe, a chemical injection assembly is connected to the top of the sewage discharge pipe and communicates with the left side of the first contraction part, a second contraction part is arranged at the left end of the sewage discharge pipe, and an oscillation assembly is connected to the left end of the second contraction part. A reaction pipeline is fixedly mounted at the left end of the oscillation assembly, and a backflow assembly is connected to the right half part of the reaction pipeline. Through the arrangement of the blow-off pipe, the oscillation assembly and the reaction pipeline, the integration degree is high, the occupied area is small, the coagulation time of rain sewage is short, and the treatment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to a rain and sewage rapid treatment device and its application method. Background Art

[0002] Rain and sewage pollution often occurs in the initial stage of heavy rain, which is formed by rainwater scouring surface pollutants and sediment in rain and sewage drainage pipes. The rain and sewage mainly contain pollutants such as suspended particulate matter (SS), organic matter, nitrogen and phosphorus, and particulate organic matter and particulate phosphorus are the main forms of existence of the two pollutants in rain and sewage. During the rainy season, when the receiving capacity of the rain and sewage pipes is exceeded, rain and sewage pollution occurs, causing the surface water body to turn black and emit a stench after entering. Therefore, it is necessary to be equipped with rain and sewage treatment facilities such as storage ponds and intercepting ponds, but their construction and maintenance costs are relatively high.

[0003] Coagulation and precipitation is a common technology for removing suspended particulate matter and total phosphorus. By adding coagulants, small particulate matters are formed into large particle groups to achieve gravitational sedimentation, thereby removing particulate pollutants. At the same time, part of the dissolved phosphorus can be removed through chemical precipitation. However, for sewage with a large amount of suspended particulate matter, a large amount of coagulants often need to be added, and sometimes flocculants also need to be added. Moreover, the coagulation process requires a large structure (coagulation tank - sedimentation tank) to achieve mud-water separation, which takes a long time and occupies a large area, and it is difficult to deal with sudden and high-load overflow sewage or initial rainwater.

[0004] Therefore, how to rapidly treat overflow sewage or initial rainwater is one of the important measures to alleviate the blackening and stinking of river channels and reduce environmental risks. At the same time, it is also the key to the transformation of environmental governance from "passive response" to "active prevention and control". Summary of the Invention

[0005] The purpose of the present invention is to provide a rain and sewage rapid treatment device that can solve the problems of large space occupation and low treatment efficiency of traditional purification equipment.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A rain and sewage rapid treatment device for rapidly treating pollutants in rain and sewage, including a sewage discharge pipe, one end of the sewage discharge pipe is an inlet connected to rain and sewage, and the other end of the sewage discharge pipe is sequentially connected to an oscillation assembly and a reaction pipeline;

[0008] The outlet of the sewage discharge pipe is connected to the inlet of the oscillation assembly, and a contraction part is provided on the sewage discharge pipe, and the contraction part is used to increase the flow rate of the rain and sewage through the Venturi effect;

[0009] A medicine injection assembly communicating with the sewage discharge pipe is sleeved outside the sewage discharge pipe for providing coagulants for treating rain and sewage;

[0010] The outlet of the oscillation assembly is connected to the inlet of the reaction pipeline, and an annular treatment device is arranged in the reaction pipeline to enhance the mixing effect of rain and sewage and the coagulant;

[0011] The outlet of the reaction pipeline is connected to the ultrafiltration unit for further treatment. An extended reaction device is arranged in the reaction pipeline. The extended reaction device is used to ensure the reaction time of rain and sewage and the coagulant in the reaction pipeline, so that the solid particles in the rain and sewage are fully structured into coagulants under the action of the coagulant.

[0012] Preferably, the contraction part includes a first contraction part and a second contraction part, and the first contraction part and the second contraction part are respectively arranged in the middle and at the outlet of the sewage discharge pipe; when rain and sewage flow through the first contraction part, due to the reduction of the cross-section of the first contraction part, the flow rate of rain and sewage increases, and a low pressure is generated around the flow of rain and sewage, adsorbing the coagulant inside the medicine injection assembly, so that the coagulant enters the inside of the sewage discharge pipe and flows forward together with the rain and sewage; when rain and sewage flow through the second contraction part, the flow rate increases again and enters the oscillation assembly.

[0013] Preferably, spiral blades are arranged in an array on the inner wall of the sewage discharge pipe, and the spiral blades are arranged at a position close to the second contraction part. When the rain and sewage and the coagulant flow through the spiral blades, under the guiding action of the spiral blades, the rain and sewage and the coagulant flow in a spiral shape together, so as to be evenly mixed.

[0014] Preferably, the medicine injection assembly includes a medicine storage cylinder, a medicine injection pipe is connected to the bottom of the medicine storage cylinder, a flow control valve is arranged on the surface of the medicine injection pipe, the bottom end of the medicine injection pipe is connected to a conical shell, the conical shell is fixedly sleeved on the first contraction part, a diversion groove is opened in the upper half of the conical shell, the diversion groove is inclined downward, and the diversion groove is communicated with the medicine injection pipe;

[0015] A through hole is penetrated through the top of the sewage discharge pipe, and the through hole is located between the first contraction part and the spiral blades. The diversion groove is communicated with the through hole, and the coagulant inside the medicine storage cylinder enters the sewage discharge pipe after passing through the medicine injection pipe, the diversion groove and the through hole.

[0016] Preferably, a flow sensor is arranged on the sewage discharge pipe, and the flow sensor and the flow control valve are respectively connected to the controller in signal. By real-time monitoring the flow rate of the sewage inside the sewage discharge pipe and feeding back the flow rate data to the controller, the controller controls the flow control valve to regulate the amount of coagulant added to the sewage per unit volume.

[0017] Preferably, the annular treatment device includes a horizontal cylindrical shell, an annular boss, a partition board and a mounting pipe;

[0018] The annular boss is integrally formed on the inner wall of the horizontal cylindrical shell close to the outlet, and the center of the annular boss is connected to a flared opening as the outlet of the oscillation assembly to connect to the reaction pipeline;

[0019] A number of partition plates are fixedly arrayed on the inner wall of the horizontal cylindrical shell. The partition plates are connected by installation pipes, and the installation pipes are fixed on the horizontal cylindrical shell;

[0020] One end of the installation pipe close to the second contraction part is a conical part. One end of the partition plate adopts an inclined ribbed structure. The ribbed structures of the partition plates closely surround the outer wall of the installation pipe and are located around the conical part. The conical part is connected to the second contraction part as the inlet of the oscillation assembly, and the other end of the installation pipe is connected to the bell mouth;

[0021] A feedback flow channel is formed between adjacent partition plates on the installation pipe. The feedback flow channel is an inclined feedback flow channel according to the shape of the conical part and the inclination direction of the partition plate;

[0022] The installation pipe adopts a hollow structure to form a diffusion cavity, and the diffusion cavity communicates with the inclined feedback flow channel;

[0023] After the rain and sewage enter the oscillation assembly through the second contraction part, the water flow flows into the diffusion cavity of the installation pipe. At the other end of the diffusion cavity, due to the Coanda effect generated by the annular boss and the inclined ribbed structure at one end of the partition plate, part of the rain and sewage enters the feedback flow channel. After entering the feedback flow channel, it flows back into the inlet of the diffusion cavity of the installation pipe from the feedback flow channel and converges with the water flow directly flowing into the diffusion cavity, thereby forming an annular water flow inside the diffusion cavity, and the annular water flow deviates from the center of the diffusion cavity; Another part of the rain and sewage flows along the inner wall of the bell mouth at the outlet of the diffusion cavity into the reaction pipe and forms a self-excited and self-sustaining oscillating jet inside the reaction pipe.

[0024] Preferably, annular grooves are arrayed along the length direction of the inner wall of the installation pipe; through the setting of the annular grooves, it is used to increase the resistance of the inner wall of the installation pipe to the flow of rain and sewage.

[0025] Preferably, the reaction pipe includes a first connecting pipe and a square pipe. The first connecting pipe is used as the inlet of the reaction pipe and is connected to it. The square pipe is used as the outlet of the reaction pipe and is connected to the ultrafiltration unit for further treatment;

[0026] The extended reaction device includes serrated inner lining plates respectively fixed on the top wall and the bottom wall of the square pipe. There are two rows of parallel flow blocking plates between the inner lining plates on the top wall and the bottom wall;

[0027] The space between the inner lining plates on the top wall and the bottom wall close to the first connecting pipe forms a gathering part, and the width of the gathering part gradually decreases from right to left;

[0028] A row of L-shaped flow channels are formed between each row of the baffle plates and the adjacent inner lining plates, and a horizontal flow channel is formed between two rows of the baffle plates. Both ends of the L-shaped flow channels are communicated with the horizontal flow channel;

[0029] One side of the baffle plate close to the horizontal flow channel is a horizontal plane, the side of the baffle plate away from the horizontal flow channel is an inclined plane, and one end of the baffle plate where rain and sewage flow is an arc surface;

[0030] The sewage is gathered by the gathering part, so that part of the rain and sewage flows into the horizontal flow channel, and the other part of the rain and sewage enters the L-shaped flow channel and flows along the L-shaped flow channel. Then, it enters the inside of the horizontal flow channel again from the L-shaped flow channel, and the rain and sewage flowing out of the two groups of L-shaped flow channels distributed up and down form a convection, hindering the flow of sewage inside the horizontal flow channel, prolonging the flow velocity of rain and sewage inside the square pipe, ensuring the reaction time between rain and sewage and the coagulant, and enabling the solid particles in the rain and sewage to fully form coagulants;

[0031] A flow velocity deceleration device is further arranged inside the square pipe. The flow velocity deceleration device is arranged in front of the extended reaction device and includes diamond-shaped cavities arranged in an array along the length direction of the square pipe. The horizontal flow channel passes through the middle of the diamond-shaped cavities, which is used to further delay the flow velocity of rain and sewage inside the square pipe;

[0032] The reaction pipeline further includes a swing plate. The swing plate is in a water droplet shape, and its tip faces the horizontal flow channel. The swing plate is inside the gathering part; circular grooves are opened on both sides of the swing plate, a rotating shaft is fixedly installed at the center of the circular groove, shaft sleeves are respectively sleeved on both sides of the rotating shaft, and the two groups of shaft sleeves are respectively fixedly installed on the inner walls of both sides of the square pipe. A disc spring is fixedly installed between the outer wall of the shaft sleeve and the inner wall of the circular groove; due to the elasticity of the disc spring, the swing plate tends to be kept in the middle of the horizontal flow channel;

[0033] Under the action of the oscillating jet, the top or bottom of the swing plate is impacted, so that the swing plate continuously swings. After the swing plate swings, it guides the rain and sewage to enter the L-shaped flow channel.

[0034] Preferably, it further includes a reflux assembly. The reflux assembly is arranged on the reaction pipeline and includes a connecting pipe two connected to the bottom of the connecting pipe one. A rain and sewage pump is arranged on the connecting pipe two. The other end of the connecting pipe two is connected to a three-way pipe. The other two ends of the three-way pipe are both connected to a connecting pipe three. A plurality of connecting pipes four are equidistantly connected to the connecting pipe three. The other end of the connecting pipe four is connected to the square pipe;

[0035] The connecting pipe four corresponds to the L-shaped flow channel one by one. A plurality of inclined holes are penetrated through the inner lining plate. The connecting pipe four is communicated with the inclined holes, and the flowing direction of water inside the inclined holes is the same as the flowing direction of water inside the L-shaped flow channel.

[0036] The present invention also provides an application method of a rain and sewage rapid treatment device, including the following steps:

[0037] Step S1: Rain and sewage enter the treatment system

[0038] Step S11: The rain and sewage flow through the first contraction part. Due to the reduction of the pipe cross-section, the flow velocity increases, forming a Venturi effect and generating a low pressure around;

[0039] Step S12: Under the action of the low pressure, the coagulant inside the medicine injection assembly is adsorbed and enters the sewage pipe to be preliminarily mixed with the rain and sewage;

[0040] Step S13: The rain and sewage continue to flow through the second contraction part, and the flow velocity further increases, promoting the uniform dispersion of the coagulant;

[0041] Step S2: Preliminary mixing of rain and sewage with the coagulant

[0042] Step S21: The rain and sewage flow through the spiral blades and flow spirally under the guiding action of the blades, strengthening the mixing of the coagulant and the water flow and improving the coagulation reaction efficiency;

[0043] Step S3: Formation of annular water flow and oscillating jet

[0044] Step S31: After the rain and sewage enter the installation pipe, part of the water flow enters the feedback channel and returns to the diffusion cavity from the feedback channel to form an annular water flow;

[0045] Step S32: The annular water flow deviates from the center of the diffusion cavity, causing the water flow to enter the reaction pipe along the inner wall of the bell mouth and forming a self-excited and self-sustaining oscillating jet;

[0046] Step S33: The oscillating jet enters the first connecting pipe, further promoting the full mixing of the rain and sewage with the coagulant;

[0047] Step S4: Optimization of the coagulation process by multi-stage flow channels

[0048] Step S41: After the rain and sewage enter the square pipe, part of the water flow enters the L-shaped flow channel through the baffle, and the other part enters the horizontal flow channel;

[0049] Step S42: Through the converging part, the rain and sewage are guided to the horizontal flow channel, extending the water flow path and optimizing the coagulation reaction time;

[0050] Step S43: The water flow velocity is reduced through the rhombic cavity to improve the sedimentation effect of solid particles;

[0051] Step S5: Strengthening the flocculation effect by the swing plate

[0052] Step S51: Under the action of the oscillating jet, the swing plate continuously swings to disturb the flow state of the rain and sewage;

[0053] Step S52: Guide rain and sewage into the L-shaped flow channel through the swing of the swing plate, further strengthening the aggregation and sedimentation of solid particles;

[0054] Step S6: The reflux system enhances the treatment efficiency

[0055] Step S61: Extract part of the rain and sewage through the reflux component via the second connecting pipe and the rain and sewage pump;

[0056] Step S62: The rain and sewage are distributed to the fourth connecting pipe through the three-way pipe and reflux to the L-shaped flow channel through the inclined holes;

[0057] Step S63: The direction of the reflux water flow is the same as the internal water flow direction of the L-shaped flow channel, which helps to maintain a stable flow state and improve the effect of the coagulant.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. For this rain and sewage rapid treatment device, through the settings of the sewage discharge pipe, the oscillation component and the reaction pipeline, it has a high degree of integration, occupies a small area, and has a short coagulation time for rain and sewage, improving the treatment efficiency of rain and sewage;

[0060] 2. For this rain and sewage rapid treatment device, the rain and sewage flow through the sewage discharge pipe from right to left. When the rain and sewage flow through the first constriction part and the second constriction part, the flow rate of the rain and sewage increases. The coagulant inside the medicine storage cylinder passes through the injection pipe, the diversion groove and the inside of the through hole and enters the inside of the sewage discharge pipe. When the rain and sewage and the coagulant flow through the spiral blade together, under the guidance of the spiral blade, the sewage flows in a spiral shape, so that the rain and sewage and the coagulant are mixed; thus achieving the effect of automatically adding the coagulant and mixing the rain and sewage with the coagulant;

[0061] 3. For this rain and sewage rapid treatment device, the rain and sewage pass through the second constriction part and enter the inside of the horizontal cylindrical shell and enter the diffusion cavity inside the installation pipe. Part of the rain and sewage enters from the left end of the feedback flow channel and flows back into the diffusion cavity from the right end of the feedback flow channel, forming an annular water flow inside the diffusion cavity. After that, when the rain and sewage inside the diffusion cavity are discharged from the flared opening, a self-excited and self-sustained oscillating jet is formed inside the first connecting pipe, making the rain and sewage and the coagulant fully mixed; thus achieving the effect of automatically mixing the rain and sewage and the coagulant through the oscillating jet;

[0062] 4. For the rain and sewage rapid treatment device, the oscillating jet continuously impacts the swing plate, causing the swing plate to swing back and forth. After the swing plate swings, the rain and sewage flow into the L-shaped flow channel at the rightmost end, and part of the rain and sewage also flows along the horizontal flow channel. The rain and sewage inside the L-shaped flow channel then flows back into the horizontal flow channel from its left end, impacting the rain and sewage inside the horizontal flow channel, inhibiting the flow rate of the rain and sewage in the horizontal flow channel. Through the setting of the diamond-shaped cavity, the flow rate of the rain and sewage is further delayed, ensuring the reaction time between the rain and sewage and the coagulant.

[0063] In summary, through the highly integrated design, the present invention optimizes the treatment efficiency of rain and sewage. The device uses a sewage discharge pipe, an oscillation component, and a reaction pipeline to complete the coagulation treatment of rain and sewage in a short time. When the rain and sewage flow through the contraction part, the flow rate increases, and the coagulant is automatically added and mixed with the sewage. Through the diffusion cavity and self-excited oscillating jet inside the horizontal cylindrical shell, the mixing effect between the coagulant and the sewage is further enhanced. At the same time, the oscillating jet impacts the swing plate, causing the sewage to flow along the L-shaped flow channel and the horizontal flow channel, delaying the flow rate, ensuring sufficient reaction time, and thus effectively improving the treatment efficiency. Brief Description of the Drawings

[0064] Figure 1 It is a three-dimensional structural schematic diagram of a rain and sewage rapid treatment device proposed by the present invention;

[0065] Figure 2 It is a front view sectional structural schematic diagram of a rain and sewage rapid treatment device proposed by the present invention;

[0066] Figure 3 It is a three-dimensional sectional structural schematic diagram at the sewage discharge pipe of a rain and sewage rapid treatment device proposed by the present invention;

[0067] Figure 4 It is a three-dimensional structural schematic diagram of the oscillation component of a rain and sewage rapid treatment device proposed by the present invention;

[0068] Figure 5 It is a front view sectional structural schematic diagram of the oscillation component of a rain and sewage rapid treatment device proposed by the present invention;

[0069] Figure 6 It is a front view sectional structural schematic diagram of the reaction pipeline of a rain and sewage rapid treatment device proposed by the present invention;

[0070] Figure 7 It is a three-dimensional structural schematic diagram of the reaction pipeline of a rain and sewage rapid treatment device proposed by the present invention;

[0071] Figure 8 It is a three-dimensional structural schematic diagram of the reflux component of a rain and sewage rapid treatment device proposed by the present invention;

[0072] Figure 9 Process flow chart of an application method of a rain and sewage rapid treatment device proposed by the present invention.

[0073] In the figure: 100, sewage discharge pipe; 200, medicine injection assembly; 300, oscillation assembly; 400, reaction pipeline; 500, reflux assembly;

[0074] 101, first contraction part; 102, second contraction part; 103, spiral blade; 104, through hole;

[0075] 201, medicine storage cylinder; 202, medicine injection pipe; 203, flow control valve; 204, conical shell; 205, diversion groove;

[0076] 301, horizontal cylindrical shell; 302, annular boss; 303, flared opening; 304, partition board; 305, installation pipe; 306, annular groove;

[0077] 401, first connecting pipe; 402, square pipe; 403, inner lining plate; 404, flow blocking plate; 405, converging part; 406, L-shaped flow channel; 407, horizontal flow channel; 408, diamond-shaped cavity; 409, swing plate; 410, circular groove; 411, rotating shaft; 412, shaft sleeve; 413, disc spring;

[0078] 501, second connecting pipe; 502, sewage pump; 503, three-way pipe; 504, third connecting pipe; 505, fourth connecting pipe; 506, inclined hole. Specific embodiments

[0079] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0080] In this embodiment, it should be understood that the term "rain and sewage" refers to the overflow sewage of the combined sewer drainage network and the initial rainwater of the separate sewer drainage network.

[0081] Embodiment 1

[0082] As Figures 1 to 8 shown, a rain and sewage rapid treatment device provided in this embodiment includes a sewage discharge pipe 100. A first contraction part 101 is arranged in the middle of the sewage discharge pipe 100. The top of the sewage discharge pipe 100 is connected with a medicine injection assembly 200, and the medicine injection assembly 200 is communicated on the left side of the first contraction part 101.

[0083] Through the Venturi effect, when the rain and sewage flow through the first contraction part 101, due to the reduction of the cross-section of the first contraction part 101, the flow rate of the rain and sewage increases, and a low pressure is generated around the flow of the rain and sewage, adsorbing the coagulant inside the dosing assembly 200, causing the coagulant to enter the inside of the sewage discharge pipe 100 and flow leftward together with the rain and sewage. A second contraction part 102 is provided at the left end of the sewage discharge pipe 100. When the rain and sewage flow through the second contraction part 102, the flow rate increases again. The left end of the second contraction part 102 is connected to an oscillation assembly 300. A reaction pipe 400 is fixedly installed at the left end of the oscillation assembly 300. The right half of the reaction pipe 400 is connected to a reflux assembly 500. The rain and sewage and the coagulant react inside the reaction pipe 400, causing the solid particles in the rain and sewage to combine with each other to form solid particles with a larger particle size. The left end of the reaction pipe 400 is connected to an ultrafiltration unit. The ultrafiltration unit selects a high-flux dense ultrafiltration membrane to filter the rain and sewage.

[0084] Please refer to Figure 3 , on the inner wall of the left half of the sewage discharge pipe 100, spiral blades 103 are arranged in an array. A through hole 104 is formed through the top of the sewage discharge pipe 100. The through hole 104 is located between the first contraction part 101 and the spiral blades 103.

[0085] The dosing assembly 200 includes a medicine storage cylinder 201. A dosing pipe 202 is connected to the bottom of the medicine storage cylinder 201. A flow control valve 203 is arranged on the surface of the dosing pipe 202. The bottom end of the dosing pipe 202 is connected to a conical shell 204. The conical shell 204 is fixedly installed on the outer wall of the middle part of the sewage discharge pipe 100. A diversion groove 205 is formed in the upper half of the conical shell 204. The diversion groove 205 is inclined, with the left end lower and the right end higher. The right end of the diversion groove 205 is communicated with the dosing pipe 202, and the left end of the diversion groove 205 is communicated with the through hole 104.

[0086] A flow sensor can be arranged on the sewage discharge pipe 100. Both the flow sensor and the flow control valve 203 are signal-connected to the controller. The flow control valve 203 is controlled through the flow rate of the sewage inside the sewage discharge pipe 100 to regulate the amount of coagulant added to the sewage per unit volume.

[0087] After the coagulant inside the medicine storage cylinder 201 passes through the dosing pipe 202, the diversion groove 205 and the through hole 104, it enters the sewage discharge pipe 100.

[0088] When the rain and sewage and the coagulant flow through the spiral blades 103, under the guiding action of the spiral blades 103, the sewage flows in a spiral shape, causing the rain and sewage to be mixed with the coagulant.

[0089] Please refer to Figures 4 - 5, the oscillation assembly 300 includes a horizontal cylindrical shell 301 fixedly installed at the left end of the second contraction part 102. An annular boss 302 is integrally formed on the inner wall of the left end of the horizontal cylindrical shell 301. The inner side of the annular boss 302 is a spherical surface, and the outer side of the annular boss 302 is a conical surface. A flared opening 303 is penetrated at the center of the annular boss 302. The flared opening 303 penetrates the left end of the horizontal cylindrical shell 301, and the aperture of the flared opening 303 gradually increases from right to left. Partition plates 304 are fixedly arranged in an array on the inner wall of the horizontal cylindrical shell 301, and the partition plates 304 are connected by installation pipes 305. One end of the installation pipe 305 close to the second contraction part 102 is a conical part, and both the inner diameter and the outer diameter of the conical part gradually increase from right to left. The middle part of the partition plate 304 is horizontal, and its left end is an inclined ribbed structure.

[0090] The outer wall of the installation pipe 305 is closely attached to the partition plate 304, and the installation pipe 305 and the two adjacent partition plates 304 form a feedback flow channel. The feedback flow channel presents an inclined feedback flow channel according to the inclined structure at the left end of the partition plate 304 and the conical part of the installation pipe 305.

[0091] A diffusion cavity is formed inside the installation pipe 305, and the left end of the inclined feedback flow channel is inclined and communicated with the diffusion cavity. Annular grooves 306 are arranged in an array along the length direction of the inner wall of the installation pipe 305. Through the arrangement of the annular grooves 306, the resistance of the inner wall of the installation pipe 305 to the flow of rain and sewage is increased.

[0092] After the rain and sewage enter the oscillation assembly 300 through the second contraction part 102, the water flow flows into the diffusion cavity of the installation pipe 305. At the other end of the diffusion cavity, due to the Coanda effect generated by the annular boss 302 and the inclined ribbed structure at one end of the partition plate 304, a part of the rain and sewage enters the feedback flow channel. After entering the feedback flow channel, it then flows back into the inlet of the diffusion cavity of the installation pipe 305 from the feedback flow channel and converges with the water flow directly flowing into the diffusion cavity, thereby forming a circular water flow inside the diffusion cavity, and the circular water flow deviates from the center of the diffusion cavity; another part of the rain and sewage flows along the inner wall of the flared opening 303 at the outlet of the diffusion cavity into the reaction pipe 400 and forms a self-excited and self-sustaining oscillating jet inside the reaction pipe 400.

[0093] Please refer to Figures 6 - 7 , the reaction pipe 400 includes a first connecting pipe 401 fixedly installed at the left end of the horizontal cylindrical shell 301. The oscillating jet formed by the rain and sewage flows inside the first connecting pipe 401, and the rain and sewage and the coagulant are fully mixed. A square pipe 402 is connected to the left end of the first connecting pipe 401. Lining plates 403 are fixedly installed on both the top wall and the bottom wall of the right half of the square pipe 402. Two rows of flow blocking plates 404 are fixedly installed between the front inner wall and the rear inner wall of the right half of the square pipe 402. The two rows of flow blocking plates 404 are located between the two groups of lining plates 403.

[0094] A converging portion 405 is formed between the right ends of the two groups of inner lining plates 403, and the width of the converging portion 405 gradually decreases from right to left. A row of L-shaped flow channels 406 is formed between each row of baffle plates 404 and the inner lining plate 403, and a horizontal flow channel 407 is formed between the two rows of baffle plates 404. Both ends of the L-shaped flow channel 406 are communicated with the horizontal flow channel 407. The side of the baffle plate 404 facing the horizontal flow channel 407 is a horizontal plane, the side of the baffle plate 404 away from the horizontal flow channel 407 is an inclined plane, and the left end of the baffle plate 404 is an arc surface. Thus, the sewage is converged through the converging portion 405, so that part of the rain sewage flows into the horizontal flow channel 407, and the other part of the rain sewage enters the right end of the L-shaped flow channel 406 and flows along the L-shaped flow channel 406. Then, it enters the horizontal flow channel 407 again from the left end of the L-shaped flow channel 406. And the rain sewage flowing out from the left ends of the two groups of L-shaped flow channels 406 distributed up and down forms a convection, hindering the flow of the sewage in the horizontal flow channel 407, prolonging the flow velocity of the rain sewage in the square pipe 402, ensuring the reaction time of the rain sewage and the coagulant, and enabling the solid particles in the rain sewage to be fully structured into coagulants.

[0095] Diamond-shaped cavities 408 are arranged in the left half of the square pipe 402 in an array along its length direction, and the horizontal flow channel 407 passes through the middle of the diamond-shaped cavities 408. Through the arrangement of the diamond-shaped cavities 408, the flow velocity of the rain sewage in the square pipe 402 is further delayed.

[0096] The reaction pipeline 400 further includes a swing plate 409. The right half of the cross-section of the swing plate 409 is arc-shaped, and the left half is V-shaped. The swing plate 409 is located inside the converging portion 405, and the tip of the swing plate 409 faces the right end of the horizontal flow channel 407. Circular grooves 410 are opened on the front and rear sides of the right end of the swing plate 409, a rotating shaft 411 is fixedly installed at the center of the circular groove 410, a bushing 412 is sleeved outside the rotating shaft 411, and the two groups of bushings 412 are respectively fixedly installed on the front inner wall and the rear inner wall of the right end of the square pipe 402. A disc spring 413 is fixedly installed between the outer wall of the bushing 412 and the inner wall of the circular groove 410. Due to the elasticity of the disc spring 413, the left end of the swing plate 409 tends to remain in the middle of the horizontal flow channel 407. Under the action of the oscillating jet, the top or bottom of the swing plate 409 is impacted, causing the swing plate 409 to continuously swing. And after the swing plate 409 swings, it guides the rain sewage to enter the rightmost L-shaped flow channel 406.

[0097] Please refer to Figures 7 - 8, the reflux assembly 500 includes a second connecting pipe 501 connected to the bottom of the first connecting pipe 401. A rain and sewage pump 502 is provided on the second connecting pipe 501. The other end of the second connecting pipe 501 is connected to a tee 503. The other two ends of the tee 503 are both connected to a third connecting pipe 504. A plurality of fourth connecting pipes 505 are equidistantly connected to the third connecting pipe 504. The other end of the fourth connecting pipe 505 is connected to the square pipe 402. The fourth connecting pipes 505 correspond to the L-shaped flow channels 406 one by one. A plurality of inclined holes 506 are penetratingly formed in the lining plate 403. The inclined holes 506 are inclined towards the left. The fourth connecting pipes 505 are communicated with the inclined holes 506. The flowing direction of the water inside the inclined holes 506 is the same as the flowing direction of the water inside the L-shaped flow channels 406.

[0098] During use, rain and sewage flow through the sewage discharge pipe 100 from right to left. When the rain and sewage flow through the first contraction part 101 and the second contraction part 102, the flowing speed of the rain and sewage increases. The coagulant inside the medicine storage cylinder 201 passes through the medicine injection pipe 202, the diversion groove 205 and the inside of the through hole 104, and enters the inside of the sewage discharge pipe 100. When the rain and sewage and the coagulant flow through the spiral blade 103 together, under the guidance of the spiral blade 103, the rain and sewage flow in a spiral shape, so that the rain and sewage and the coagulant are mixed.

[0099] After that, the rain and sewage pass through the second contraction part 102 and enter the inside of the horizontal cylindrical shell 301 and then enter the diffusion cavity inside the installation pipe 305. Part of the water flow flows into the diffusion cavity of the installation pipe 305. Another part of the rain and sewage, due to the Coanda effect generated by the annular boss 302 and the ribbed structure with one end of the partition plate 304 being inclined, makes part of the rain and sewage enter the feedback flow channel. After entering the feedback flow channel, it then flows back into the diffusion cavity of the installation pipe 305 from the feedback flow channel, forming an annular water flow inside the diffusion cavity, and the annular water flow deviates from the center of the diffusion cavity. After that, when the rain and sewage inside the diffusion cavity are discharged from the flared mouth 303, a self-excited and self-sustaining oscillating jet is formed inside the first connecting pipe 401, so that the rain and sewage and the coagulant are fully mixed.

[0100] After that, the oscillating jet continuously impacts the swing plate 409, causing the swing plate 409 to swing back and forth. After the swing plate 409 swings, part of the rain and sewage flows into the rightmost L-shaped flow channel 406, and part of the rain and sewage also flows along the horizontal flow channel 407. The rain and sewage inside the L-shaped flow channel 406 then flows back into the horizontal flow channel 407 from its left end, impacting the rain and sewage inside the horizontal flow channel 407, inhibiting the flowing speed of the rain and sewage inside the horizontal flow channel 407. Through the setting of the diamond-shaped cavity 408, the flowing speed of the rain and sewage is further delayed, ensuring the reaction time between the sewage and the coagulant.

[0101] Then, the rain and sewage pump 502 and the second connecting pipe 501 cooperate to suck the rain and sewage from the inside of the first connecting pipe 401, and then convey the rain and sewage to the tee 503. The rain and sewage are diverted through two third connecting pipes 504, and then the rain and sewage enter the right end of the L-shaped flow channel 406 through the fourth connecting pipe 505 to impact the rain and sewage inside the L-shaped flow channel 406, preventing blockage inside the L-shaped flow channel 406.

[0102] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0103] In summary, through high-integration design, the present invention optimizes the treatment efficiency of rain and sewage. The device adopts a sewage discharge pipe, an oscillation assembly, and a reaction pipeline to complete the coagulation treatment of rain and sewage in a short time. When the rain and sewage flow through the contraction part, the flow rate increases, and the coagulant is automatically added and mixed with the sewage. Through the diffusion chamber and self-excited oscillating jet in the horizontal cylindrical shell, the mixing effect of the coagulant and the sewage is further enhanced. At the same time, the oscillating jet impacts the swing plate, causing the sewage to flow along the L-shaped flow channel and the horizontal flow channel, delaying the flow rate, ensuring sufficient reaction time, and thus effectively improving the treatment efficiency.

[0104] This embodiment also provides a rapid rain and sewage treatment process, and its process flow is shown in Figure 9 as follows. The main body of the process mainly includes an inlet unit, a rapid rain and sewage treatment unit, and an ultrafiltration unit. Among them, the inlet unit consists of an inlet pipeline, a pressure pump, and a valve assembly; the rapid rain and sewage treatment unit is composed of Figure 1 a rapid rain and sewage treatment device shown in the figure; the ultrafiltration unit consists of an inlet pipeline, a hollow fiber membrane module, a backwashing pipeline, a backwashing pump, a backwashing drainage pipeline, a water production pipeline, a water storage tank, and a valve assembly. The specific implementation steps of the rain and sewage treatment process of this embodiment are as follows:

[0105] (1) The rain and sewage to be treated are pumped into the sewage discharge pipe 100 by the pressure pump of the inlet unit and enter the rapid rain and sewage treatment unit;

[0106] (2) The rain and sewage complete rapid mixing and reaction with the coagulant in the rapid rain and sewage treatment unit, and the colloids and fine particulate substances in the water are destabilized and coagulated to form larger flocs;

[0107] (3) The pressurized mixed liquid enters the ultrafiltration unit through the reaction pipeline 400. The operation mode of the ultrafiltration unit is cross-flow filtration, the operation cycle is 30 min, and the operation pressure is controlled at 0.10 - 0.20 MPa. Flocs in the rain and sewage are first intercepted by the membrane, and at the same time, a filter cake layer is formed on the membrane surface to help intercept fine particulate matters. The clear liquid passes through the pores of the filter cake layer under the action of pressure, then enters the internal water collection area of the hollow fiber membrane through the ultrafiltration membrane pores, and finally is discharged through the water production pipeline. Part of the filter cake layer falls off under the scouring of the water flow and is discharged to the sludge storage tank through the backwash drainage pipeline;

[0108] (4) After the end of the periodic operation, close the inlet unit, close the inlet valve and the water production valve of the ultrafiltration unit, open the backwash valve, and perform backwashing at a pressure of 0.10 MPa for 1 min. The backwash water enters the sludge storage tank through the backwash drainage pipeline. After the backwashing is completed, close the backwash valve, open the inlet valve and the water production valve, and open the inlet unit to repeat the periodic operation.

[0109] The following describes this embodiment in more detail and clearly in combination with specific implementation parameters.

[0110] Example 2

[0111] For the initial rainwater of a separate sewer system, the COD concentration is 45.63 ± 2.32 mg / L, the TP concentration is 1.26 ± 0.20 mg / L, the turbidity is 305 ± 10 NTU, and the SS is 216.40 ± 10.20 mg / L. The process route in Example 1 is adopted, the inlet flow rate is 1.20 L / min, and the operation pressure of the ultrafiltration unit is 0.10 MPa.

[0112] After being treated by the rain and sewage rapid treatment process technology in this Example 1, the removal rates of COD, TP, and SS reach 70.86 ± 5.20%, 85.02 ± 2.44%, and 99.19 ± 0.22% respectively, and the effluent COD and TP can meet the Class IV water quality standard of the Environmental Quality Standards for Surface Water.

[0113] The coagulant used in the example is polyaluminum chloride (Al2O3 content ≥ 30%), and the dosing amount is 8 - 10 mg / L. The ultrafiltration unit uses a hollow fiber ultrafiltration membrane module with a pore size of 0.03 - 0.08 μm, the filtration method is external pressure type, and the initial water production rate is set at 95%.

[0114] Example 3

[0115] The overflow sewage of a combined sewer system has a COD of 65.53 ± 1.02 mg / L, a TP of 1.91 ± 0.07 mg / L, a turbidity of 715 ± 12 NTU, and an SS of 592 ± 20.0 mg / L. Using the process route in Example 1, with an influent flow rate of 1.20 L / min, after being treated by the rain and sewage rapid treatment process technology in this Example 1, the removal rates of COD, TP, and SS reach 77.38 ± 0.80%, 85.92 ± 1.04%, and 99.71 ± 0.18% respectively. The effluent COD and TP can meet the Class IV water quality standard of the Environmental Quality Standards for Surface Water.

[0116] Different from the water quality of Example 2, the overflow sewage in Example 3 has a relatively high content of colloids and macromolecular organic matter, which is effectively intercepted after coagulation and ultrafiltration. At the same time, to ensure the removal of phosphorus, the dosage of the coagulant is increased to 25 - 30 mg / L.

[0117] The coagulant used in Example 3 is polyaluminum chloride (with an Al2O3 content ≥ 30%), and the dosage is 25 - 30 mg / L. The ultrafiltration unit uses a hollow fiber ultrafiltration membrane with a pore size of 0.03 - 0.08 μm, the filtration method is external pressure type, and the initial water production rate is set at 95%.

[0118] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0119] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0120] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A rainwater and sewage rapid treatment device for rapidly treating pollutants in rainwater and sewage, comprising a sewage pipe (100), characterized in that: One end of the sewage pipe (100) is an inlet connected to rainwater and sewage, and the other end of the sewage pipe (100) is connected to the oscillation component (300) and the reaction pipeline (400) in sequence; The outlet of the sewage pipe (100) is connected to the inlet of the oscillating assembly (300), and a contraction portion is provided on the sewage pipe (100), and the contraction portion is used to increase the flow rate of the rainwater and sewage through the Venturi effect; The sewage pipe (100) is provided with a medicine injection assembly (200) in communication therewith, for providing a coagulant for treating rainwater and sewage; The outlet of the oscillating component (300) is connected to the inlet of the reaction pipe (400), and a ring-shaped treatment device is provided inside the oscillating component (300) to increase the mixing effect of rainwater, sewage and coagulant; The outlet of the reaction pipe (400) is connected to an ultrafiltration unit for the next step of treatment. The reaction pipe (400) is provided with an extended reaction device, which is used to ensure the reaction time of rainwater and sewage and coagulant in the reaction pipe (400) so that the solid particles in the rainwater and sewage can be fully structured into coagulants under the action of the coagulant.

2. A rainwater and sewage rapid treatment device according to claim 1, characterized in that: The contraction portion comprises a contraction portion 1 (101) and a contraction portion 2 (102), and the contraction portion 1 (101) and the contraction portion 2 (102) are respectively arranged at the middle part and the outlet of the sewage pipe (100); when rainwater and sewage flow through the contraction portion 1 (101), the cross-section of the contraction portion 1 (101) is reduced, so that the flow rate of the rainwater and sewage increases, and a low pressure is generated around the flow of rainwater and sewage, which adsorbs the coagulant inside the injection component (200), so that the coagulant enters the sewage pipe (100) and flows forward together with the rainwater and sewage; when the rainwater and sewage flow through the contraction portion 2 (102), the flow rate increases again and enters the oscillation component (300).

3. A rapid rainwater and sewage treatment device according to claim 2, characterized in that: The inner wall array of the sewage pipe (100) is provided with spiral blades (103), and the spiral blades (103) are arranged near the second contraction portion (102). When the rainwater, sewage and coagulant flow through the spiral blades (103), the rainwater, sewage and coagulant flow in a spiral shape under the guidance of the spiral blades (103), thereby being evenly mixed.

4. A rapid rainwater and sewage treatment device according to claim 2, characterized in that: The drug injection assembly (200) comprises a drug storage barrel (201), the bottom of the drug storage barrel (201) is connected to a drug injection tube (202), a flow control valve (203) is arranged on the surface of the drug injection tube (202), the bottom end of the drug injection tube (202) is connected to a conical shell (204), the conical shell (204) is fixedly sleeved on the contraction part (101), a guide groove (205) is opened in the upper half of the conical shell (204), the guide groove (205) is inclined downward, and the guide groove (205) is connected to the drug injection tube (202); A through hole (104) is provided through the top of the sewage pipe (100), and the through hole (104) is located between the contraction portion 101 and the spiral blade (103). The guide groove (205) is connected to the through hole (104). The coagulant inside the drug storage cylinder (201) passes through the drug injection tube (202), the guide groove (205) and the through hole (104) and then enters the sewage pipe (100).

5. A rainwater and sewage rapid treatment device according to claim 4, characterized in that: The sewage pipe (100) is provided with a flow sensor, and the flow sensor and the flow control valve (203) are respectively connected to the controller signal. The flow rate of the sewage inside the sewage pipe (100) is monitored in real time, and the flow rate data is fed back to the controller. The controller controls the flow control valve (203) to adjust the amount of coagulant added to the unit volume of sewage.

6. A rapid rainwater and sewage treatment device according to claim 2, characterized in that: The annular processing device comprises a horizontal cylindrical shell (301), an annular boss (302), a partition (304) and a mounting pipe (305); The annular boss (302) is integrally formed and arranged on the inner wall of the horizontal cylindrical shell (301) near the outlet, and the center of the annular boss (302) is connected to the bell mouth (303) as the outlet of the oscillation component (300) and connected to the reaction pipe (400); A plurality of partitions (304) are fixed to the inner wall array of the horizontal cylindrical shell (301), and the plurality of partitions (304) are connected by a mounting tube (305), and the mounting tube (305) is fixed to the horizontal cylindrical shell (301); One end of the mounting tube (305) close to the second contraction portion (102) is a conical portion, one end of the partition (304) adopts an inclined rib structure, a plurality of rib structures of the partition (304) are closely arranged on the outer wall of the mounting tube (305) and are located around the conical portion, the conical portion is connected to the second contraction portion (102) as the entrance of the oscillation component (300), and the other end of the mounting tube (305) is connected to the bell mouth (303); A feedback flow channel is formed between adjacent partitions (304) on the mounting tube (305), wherein the feedback flow channel is an inclined feedback flow channel according to the shape of the tapered portion and the inclination direction of the partition (304); The installation tube (305) adopts a hollow structure to form a diffusion cavity, and the diffusion cavity is connected to the inclined feedback flow channel; After the rainwater and sewage enter the oscillation assembly (300) through the second contraction portion (102), the water flows into the diffusion chamber of the installation tube (305). At the other end of the diffusion chamber, the annular boss (302) and the inclined rib-shaped structure at one end of the partition (304) produce a Coanda effect, causing a portion of the rainwater and sewage to enter the feedback flow channel. After entering the feedback flow channel, the rainwater and sewage flows back from the feedback flow channel into the inlet of the diffusion chamber of the installation tube (305) and merges with the water flow that directly flows into the diffusion chamber, thereby forming an annular water flow inside the diffusion chamber, and the annular water flow deviates from the center of the diffusion chamber; the other portion of the rainwater and sewage flows along the inner wall of the bell mouth (303) at the outlet of the diffusion chamber into the reaction pipe (400), and forms a self-excited and self-sustaining oscillating jet inside the reaction pipe (400).

7. The rainwater and sewage rapid treatment device according to claim 1 is characterized in that: The inner wall of the installation pipe (305) is provided with annular grooves (306) in an array along its length direction; the annular grooves (306) are provided to increase the resistance of the inner wall of the installation pipe (305) to the flow of rainwater and sewage.

8. The rainwater and sewage rapid treatment device according to claim 1 is characterized in that: The reaction pipeline (400) comprises a connecting pipe (401) and a square pipe (402), wherein the connecting pipe (401) is connected to the (303) as the inlet of the reaction pipeline (400), and the square pipe (402) is connected to the ultrafiltration unit as the outlet of the reaction pipeline (400) for the next step of processing; The extended reaction device comprises serrated inner lining plates (403) respectively fixed to the top wall and the bottom wall of the square tube (402), and two rows of parallel baffles (404) are arranged between the inner lining plates (403) of the top wall and the bottom wall; A gathering portion (405) is formed in the space between the inner lining plates (403) of the top wall and the bottom wall near the connecting pipe 1 (401), and the width of the gathering portion (405) gradually decreases from right to left; A row of L-shaped flow channels (406) is formed between each row of the baffles (404) and the adjacent inner lining plates (403), a horizontal flow channel (407) is formed between two rows of the baffles (404), and both ends of the L-shaped flow channel (406) are connected to the horizontal flow channel (404); The side of the baffle (404) close to the horizontal flow channel (407) is a horizontal surface, the side of the baffle (404) away from the horizontal flow channel (407) is an inclined surface, and one end of the baffle (404) through which rainwater and sewage flow is an arc-shaped surface; The sewage is gathered by the gathering part (405), so that part of the rainwater and sewage flows into the horizontal flow channel (407), and the other part of the rainwater and sewage enters the L-shaped flow channel (406) and flows along the L-shaped flow channel (406), and then enters the horizontal flow channel (407) again from the L-shaped flow channel (406), and the rainwater and sewage flowing out of the two groups of L-shaped flow channels (406) distributed up and down form convection, which hinders the flow of sewage in the horizontal flow channel (407), prolongs the flow speed of the rainwater and sewage in the square tube (402), ensures the reaction time between the rainwater and sewage and the coagulant, and makes the solid particles in the rainwater and sewage fully structure into coagulants; A flow velocity reduction device is also provided in the square tube (402), and the flow velocity reduction device is arranged in front of the extended reaction device, and comprises rhombus-shaped cavities (408) arranged in an array along the length direction of the square tube (402), and the horizontal flow channel (407) passes through the middle of the rhombus-shaped cavity (408), so as to further slow down the flow velocity of rainwater and sewage in the square tube (402); The reaction pipe (400) further comprises a swing plate (409), the swing plate (409) is in the shape of a water droplet, the tip of which faces the horizontal flow channel (407), and the swing plate (409) is located inside the gathering portion (405); circular grooves (410) are provided on both sides of the swing plate (409), a rotating shaft (411) is fixedly installed at the center of the circular groove (410), and shaft sleeves (412) are respectively sleeved on both sides of the rotating shaft (411), and two groups of shaft sleeves (412) are respectively fixedly installed on the inner walls of both sides of the square tube (402), and a coil spring (413) is fixedly installed between the outer wall of the shaft sleeve (412) and the inner wall of the circular groove (410); the elasticity of the coil spring (413) causes the swing plate (409) to tend to remain in the middle of the horizontal flow channel (407); Under the action of the oscillating jet, the top or bottom of the swing plate (409) is impacted, causing the swing plate (409) to swing continuously, and after the swing plate (409) swings, the rainwater and sewage are guided to enter the L-shaped flow channel (406).

9. A rapid rainwater and sewage treatment device according to claim 8, characterized in that: It also includes a reflux component (500), which is arranged on the reaction pipeline (400), including a connecting pipe (501) connected to the bottom of the connecting pipe (401), a rainwater and sewage pump (502) is arranged on the connecting pipe (501), the other end of the connecting pipe (501) is connected to a tee (503), the other two ends of the tee (503) are connected to a connecting pipe (504), a plurality of connecting pipes (505) are equidistantly connected to the connecting pipe (504), and the other end of the connecting pipe (505) is connected to the square pipe (402); The connecting pipe four (505) corresponds to the L-shaped flow channel (406) one by one, and a plurality of inclined holes (506) are penetrated through the inner lining plate (403). The connecting pipe four (505) is connected to the inclined hole (506), and the flow direction of water inside the inclined hole (506) is the same as the flow direction of water inside the L-shaped flow channel (406).

10. An application method of the rainwater and sewage rapid treatment device according to any one of claims 1 to 9, characterized in that: The steps include: Step S1: Rainwater and sewage enter the treatment system Step S11: The rainwater and sewage flow through the contraction part 1 (101). As the pipe cross section is reduced, the flow velocity increases, forming a Venturi effect and generating low pressure around it; Step S12: low pressure is used to absorb the coagulant inside the injection assembly (200) so that it enters the sewage pipe (100) and is initially mixed with the rainwater and sewage; Step S13: The rainwater and sewage continue to flow through the second contraction section (102), and the flow rate is further increased to promote uniform dispersion of the coagulant; Step S2: Preliminary mixing of rainwater, sewage and coagulant Step S21: the rainwater and sewage flow through the spiral blades (103) and flow in a spiral shape under the guidance of the blades, thereby enhancing the mixing of the coagulant and the water flow and improving the coagulation reaction efficiency; Step S3: Formation of annular water flow and oscillating jet Step S31: After the rainwater and sewage enter the installation pipe (305), part of the water flows into the feedback flow channel and flows back from the feedback flow channel to the diffusion chamber to form an annular water flow; Step S32: the annular water flow deviates from the center of the diffusion chamber, so that the water flow enters the reaction pipe (400) along the inner wall of the bell mouth (303) and forms a self-excited and self-sustaining oscillating jet; Step S33: the oscillating jet enters the connecting pipe 1 (401) to further promote the full mixing of rainwater, sewage and coagulant; Step S4: Multi-stage flow channel optimization coagulation process Step S41: After the rainwater and sewage enter the square pipe (402), part of the water flows through the baffle (404) into the L-shaped flow channel (406), and the other part enters the horizontal flow channel (407); Step S42: The rainwater and sewage are guided to the horizontal flow channel (407) through the gathering part (405), extending the water flow path and optimizing the coagulation reaction time; Step S43: reducing the water flow velocity through the diamond-shaped cavity (408) to improve the sedimentation effect of solid particles; Step S5: Swinging plate enhances flocculation effect Step S51: Under the action of the oscillating jet, the swing plate (409) is continuously oscillated to disturb the flow state of rainwater and sewage; Step S52: guiding rainwater and sewage into the L-shaped flow channel (406) by swinging the swing plate (409), so as to further enhance the aggregation and sedimentation of solid particles; Step S6: Reflux system enhances processing efficiency Step S61: extracting part of the rainwater and sewage through the return assembly (500) via the connecting pipe 2 (501) and the rainwater and sewage pump (502); Step S62: rainwater and sewage are distributed to the connecting pipe 4 (505) through the tee pipe (503), and flow back to the L-shaped flow channel (406) through the inclined hole (506); Step S63: The direction of the return water flow is the same as the direction of the water flow inside the L-shaped flow channel, which helps to maintain a stable flow state and improve the effect of the coagulant.

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