Rain and sewage confluence discharge treatment system

Abstract

The invention relates to the technical field of sewage treatment, and discloses a rainwater and sewage confluence discharge treatment system. The rainwater and sewage confluence discharge treatment system comprises a water inlet assembly, a water discharge assembly and a sewage treatment device, wherein the water inlet assembly comprises a rainwater and sewage confluence pipe; the drainage assembly comprises a first drainage pipe and a second drainage pipe, the first drainage pipe is connected with the sewage treatment plant, and the second drainage pipe is connected with a water body; the water inlet side of the sewage treatment device is connected with the rain-sewage collecting pipe, and the water outlet side is connected with the first drainage pipe and the second drainage pipe. By arranging the sewage treatment device, water discharged into a water body by the second drainage pipe can be treated, the water quality of the water body is prevented from being polluted, the water environment is prevented from being influenced, water discharged into a sewage treatment plant by the first drainage pipe can be pretreated, and the treatment pressure of the sewage treatment plant is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a rainwater-sewage combined discharge treatment system. Background Art

[0002] Urban sewage treatment requires centralized treatment and discharge of sewage generated by residents' daily lives, wastewater generated by industrial production activities, and rainwater during rainy weather to prevent pollution of surrounding water bodies. Sewage discharge systems can be divided into combined drainage systems and separate drainage systems. The combined drainage system is a drainage system that collects rainwater, domestic sewage, and industrial wastewater through the same pipe and then mixes and discharges them to the sewage treatment plant for treatment. The separate drainage system is a drainage system that discharges domestic sewage, industrial wastewater, and rainwater through independent pipes to the sewage treatment plant for treatment.

[0003] On sunny days, the combined sewer system only needs to discharge domestic sewage and industrial wastewater, and the amount of sewage is relatively small. All sewage can be discharged into the sewage treatment plant for treatment before being discharged. However, in rainy weather, especially when the rainfall is heavy, the rainwater flowing into the pipes will cause a sharp increase in sewage discharge in a short period of time. If the interception wells in the drainage system cannot intercept all the sewage, some sewage will overflow from the interception wells and directly flow into nearby water bodies. This part of sewage is not treated, so it will pollute the water body, causing the water quality of the water body to deteriorate, and causing serious impacts on the water environment. Summary of the invention

[0004] In view of this, the present invention provides a combined rainwater and sewage discharge treatment system to solve the problem that when the rainfall is heavy, some sewage in the combined sewer system will overflow from the interception well and be discharged directly into the water body, polluting the water quality and affecting the water environment.

[0005] In a first aspect, the present invention provides a combined rainwater and sewage discharge treatment system, comprising:

[0006] A water inlet assembly, the water inlet assembly comprising a rainwater and sewage manifold;

[0007] A drainage component, the drainage component comprising: a first drainage pipe and a second drainage pipe, the first drainage pipe is connected to a sewage treatment plant, and the second drainage pipe is connected to a water body;

[0008] A sewage treatment device, wherein the water inlet side of the sewage treatment device is connected to the rainwater and sewage confluence pipe, and the water outlet side is connected to the first drain pipe and the second drain pipe.

[0009] Beneficial Effects

[0010] On sunny days, sewage, i.e. domestic sewage, industrial sewage, etc., is discharged from the rainwater-sewage confluence pipe. On rainy days, rainwater is also discharged at the same time, i.e., rainwater and sewage are mixed. By setting up a sewage treatment device, the water discharged from the second drainage pipe to the water body can be treated to prevent it from polluting the water quality of the water body and affecting the water environment. The water discharged from the first drainage pipe to the sewage treatment plant can also be pre-treated, reducing the treatment pressure of the sewage treatment plant.

[0011] In an optional embodiment, the sewage treatment device includes a plurality of sewage treatment components arranged at intervals along the sewage flow direction in the rainwater and sewage conduit.

[0012] Beneficial Effects

[0013] Setting up multiple sets of sewage treatment components can improve the sewage treatment capacity of the combined rainwater and sewage discharge treatment system and meet the treatment needs of large-flow sewage.

[0014] In an optional embodiment, the sewage treatment component includes: a flow mechanism and a filtering mechanism, the flow mechanism is provided on at least one side of the filtering mechanism, the flow mechanism is connected to the rainwater and sewage junction and the first drain pipe, and the filtering mechanism is connected to the flow mechanism and the second drain pipe.

[0015] In an optional embodiment, the flow mechanism includes a plurality of flow grooves arranged in steps from high to low along the water inlet side to the water outlet side of the sewage treatment device, and adjacent flow grooves are connected by flow holes; the filtering device includes a plurality of filter grooves arranged in steps from high to low along the water inlet side to the water outlet side of the sewage treatment device, and adjacent filter grooves are connected by filter holes, the flow grooves are connected to the filter grooves accordingly, and filter plates are provided at the connections.

[0016] Beneficial Effects

[0017] The flow mechanism and filtering mechanism can overflow and filter the sewage for purification, and multiple flow slots and filtering slots are arranged in a stepped manner, thus realizing the stepped treatment of sewage, and the sewage treatment effect is better.

[0018] In an optional embodiment, the sewage treatment component also includes an impurity treatment mechanism, which includes: a storage device and a delivery pipe, the storage device stores flocculant inside, and the storage device is connected to the delivery pipe, the delivery pipe is arranged in the flow mechanism, and the delivery pipe section located in the flow groove is provided with a spray hole.

[0019] Beneficial Effects

[0020] The flocculant is supplied to the delivery pipe through the storage device, and then sprayed into the flow tank through the spray hole. The flocculant reacts with the impurities carried in the sewage to form sludge, which settles to the bottom of the flow tank. The impurities in the sewage can be further processed by setting up an impurity treatment mechanism to improve the sewage purification effect.

[0021] In an optional embodiment, the sewage treatment component also includes a sludge treatment mechanism.

[0022] In an optional embodiment, the sludge treatment mechanism includes: a sludge discharge trough, a sludge conveying member and a sludge collecting trough, the sludge discharge trough is located below the flow mechanism, the sludge collecting trough is located below one end of the sludge discharge trough close to the drainage component, and the sludge conveying member is arranged in the sludge discharge trough for transporting the sludge in the sludge discharge trough to the sludge discharge trough.

[0023] In an optional embodiment, the sludge treatment mechanism further includes a sludge discharge member, and the sludge discharge member is connected to the sludge concentration tank via a sludge transport pipe.

[0024] Beneficial Effects

[0025] The sludge in the flow trough can be discharged into the sludge discharge trough below, and then the sludge conveying device can convey the sludge at various positions in the sludge discharge trough to the sludge concentration trough for unified collection, so that the sludge discharge part can discharge the sludge in the sludge concentration trough. The sludge treatment mechanism can collect and treat the sludge generated by the impurity treatment mechanism, and cooperate with the impurity treatment mechanism to remove impurities in the sewage.

[0026] In an optional embodiment, it further includes a power generation mechanism, which includes a water wheel and a generator set. The water wheel is arranged in the flow channel, the water wheel is connected to the generator set, and the generator set is connected to the sludge conveying member and the sludge discharging member.

[0027] Beneficial Effects

[0028] When the sewage flows into the flow chute, the power generation mechanism can use the potential energy and kinetic energy of the sewage to generate and store electrical energy, and then supply it to the sludge conveying and sludge discharging parts in the sewage treatment system, which is equivalent to electrical equipment, thus achieving self-sufficiency in electrical energy without the need for external power supply.

[0029] In an optional embodiment, the water inlet assembly further includes: a rainwater discharge pipe and a sewage discharge pipe, and the rainwater discharge pipe and the sewage discharge pipe are connected to the rainwater and sewage junction pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the rainwater-sewage combined drainage treatment system of the present invention;

[0032] Figure 2 It is a schematic diagram of a sewage treatment device in the rainwater-sewage combined drainage treatment system of the present invention;

[0033] Figure 3 It is a schematic diagram of the impurity treatment mechanism and sludge treatment structure in the combined rainwater and sewage discharge treatment system of the present invention.

[0034] Description of reference numerals:

[0035] 11. Rainwater and sewage confluence pipe, 12. Rainwater discharge pipe, 13. Sewage discharge pipe, 14. Water inlet pipe, 15. Solenoid valve;

[0036] 21. first drainage pipe, 22. second drainage pipe, 23. first water outlet pipe, 24. second water outlet pipe;

[0037] 31. Sewage treatment component, 311. Flow mechanism, 3111. Flow slot, 3112. Flow hole, 312. Filter mechanism, 3121. Filter slot, 3122. Filter hole, 3123. Filter plate, 3131. Storage device, 3132. Delivery pipe, 3133. Spray hole, 3134. Check valve, 3141. Sludge discharge slot, 3142. Sludge delivery member, 31421. Motor, 31422. Reducer, 31423. Auger, 3143. Sludge concentration tank, 3144. Sludge discharge member, 3145. Sludge delivery pipe;

[0038] 41. Water wheel, 42. Generator set. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0041] According to an embodiment of the present invention, a combined rainwater and sewage discharge treatment system is provided, comprising: an inlet assembly, a drainage assembly and a sewage treatment device. The inlet assembly comprises a rainwater and sewage confluence pipe 11. The drainage assembly comprises: a first drainage pipe 21 and a second drainage pipe 22, the first drainage pipe 21 is connected to a sewage treatment plant, and the second drainage pipe 22 is connected to a water body. The water inlet side of the sewage treatment device is connected to the rainwater and sewage confluence pipe 11, and the water outlet side is connected to the first drainage pipe 21 and the second drainage pipe 22.

[0042] The rainwater-sewage confluence pipe 11 is a pipe for collecting the sewage to be discharged. Generally, on sunny days, the rainwater-sewage confluence pipe 11 contains domestic sewage, industrial wastewater, etc., and when it rains, the rainwater-sewage confluence pipe 11 contains both domestic sewage, industrial wastewater, and rainwater. That is to say, the amount of sewage discharged on sunny days is small, and the amount of sewage discharged on rainy days is large. The sewage enters the sewage treatment device from the water inlet component, is purified by the sewage treatment device, and then discharged through the drainage component.

[0043] The combined sewerage treatment system conducts preliminary purification of sewage through sewage treatment equipment. This can not only ensure that the sewage discharged into the water body is treated, will not pollute the water quality of the water body and affect the water environment, but also reduce the working pressure of the sewage treatment plant.

[0044] In one embodiment, the water inlet assembly further includes: a rainwater discharge pipe 12 and a sewage discharge pipe 13 , and the rainwater discharge pipe 12 and the sewage discharge pipe 13 are connected to the rainwater and sewage confluence pipe 11 .

[0045] The rainwater discharge pipe 12 is a pipe that collects rainwater from the road surface and other places on rainy days, and the sewage discharge pipe 13 is a pipe that collects domestic sewage, industrial wastewater, etc. The sewage discharge pipe 13 discharges domestic sewage and industrial wastewater all day long, while the rainwater discharge pipe 12 generally has no rainwater inside the pipe on sunny days, and only on rainy days will rainwater be collected into the pipe. The rainwater discharge pipe 12 and the sewage discharge pipe 13 are both connected to the rainwater and sewage confluence pipe 11, and rainwater and domestic sewage are discharged to the rainwater and sewage confluence pipe 11 on rainy days.

[0046] In one embodiment, the sewage treatment device includes a plurality of sewage treatment components 31 arranged at intervals along the sewage flow direction in the rainwater-sewage conduit 11 .

[0047] Providing multiple groups of sewage treatment components 31 can improve the sewage treatment capacity of the sewage treatment device, and can cope with rainy weather with heavy precipitation to meet the situation where the sewage discharge volume increases suddenly in a short period of time. In this embodiment, three groups of sewage treatment components 31 are provided. Of course, in other embodiments, other numbers of sewage treatment components 31 can be provided according to the demand for regional sewage discharge, such as four groups, six groups, etc. In other embodiments, if it can meet the use requirements, only one group of sewage treatment components 31 can be provided.

[0048] In one embodiment, the sewage treatment component 31 includes: a flow mechanism 311 and a filter mechanism 312, at least one side of the filter mechanism 312 is provided with the flow mechanism 311, the flow mechanism 311 is connected to the rainwater and sewage junction 11 and the first drain pipe 21, and the filter mechanism 312 is connected to the flow mechanism 311 and the second drain pipe 22.

[0049] The flow mechanism 311 is connected to the rainwater and sewage confluence pipe 11 through the water inlet pipe 14, that is, the sewage in the rainwater and sewage confluence pipe 11 will be discharged into the flow mechanism 311. In addition, a solenoid valve 15 is provided on the water inlet pipe 14, and the solenoid valve 15 can control the on and off of the water inlet pipe 14. Therefore, the corresponding solenoid valve 15 can be opened according to the actual discharge amount of sewage, and the corresponding number of sewage treatment components 31 can be selected to work. The sewage first enters the flow mechanism 311 and then enters the filtering mechanism 312 for treatment, and finally is discharged to the sewage treatment plant through the first drain pipe 21, and is discharged to the nearby water body through the second drain pipe 22.

[0050] In one embodiment, the flow mechanism 311 includes a plurality of flow grooves 3111 arranged in a step-by-step manner from high to low along the water inlet side to the water outlet side of the sewage treatment device, and adjacent flow grooves 3111 are connected through flow holes 3112; the filtering device includes a plurality of filter grooves 3121 arranged in a step-by-step manner from high to low along the water inlet side to the water outlet side of the sewage treatment device, and adjacent filter grooves 3121 are connected through filter holes 3122, the flow grooves 3111 are correspondingly connected to the filter grooves 3121, and a filter plate 3123 is provided at the connection.

[0051] The structures of the flow mechanism 311 and the filter mechanism 312 are similar, and the flow mechanism 311 can be set only on one side of the filter mechanism 312, or the flow mechanism 311 can be set on both sides of the filter mechanism 312. In this embodiment, the flow mechanism 311 is set on both sides of the filter mechanism 312. Specifically, the flow mechanism 311 includes five flow slots 3111, and the five flow slots 3111 are arranged from high to low from the side of the water inlet component to the side of the drainage component. The highest flow slot 3111 is connected to the water inlet pipe 14, and the lowest flow slot 3111 is connected to the first outlet pipe 23. The wall surface of two adjacent flow slots 3111 is provided with a flow hole 3112, that is, the sewage gradually accumulates in the previous flow slot 3111. When the water level reaches the flow hole 3112, the sewage will overflow into the next flow slot 3111, and the sewage overflows in the five flow slots 3111 in turn through the first outlet pipe 23 and finally enters the first drainage pipe 21. The filter mechanism 312 also includes five filter slots 3121, which are arranged from high to low from the water inlet component side to the drainage component side, and the lowest flow slot 3111 is connected to the second water outlet pipe 24. Each filter slot 3121 is connected to a corresponding flow slot 3111, and a filter plate 3123 is arranged at the connection, that is, the sewage in the flow slot 3111 overflows from the filter plate 3123 into the filter slot 3121, and the impurities carried by the sewage when passing through the filter plate 3123 can be filtered out by the filter plate 3123. The connection method between adjacent filter tanks 3121 is the same as the connection method between adjacent flow tanks 3111. The connection between adjacent filter tanks 3121 is provided with a filter hole 3122, that is, sewage gradually accumulates in the previous filter tank 3121. When the water level reaches the filter hole 3122, the sewage will overflow into the next filter tank 3121. The sewage overflows in the five filter tanks 3121 in turn through the second outlet pipe 24 and finally enters the second drain pipe 22.

[0052] In other embodiments, the number of the flow slots 3111 and the filter slots 3121 can be adaptively adjusted, for example, three, six, etc.

[0053] The sewage overflows and is filtered through the flow mechanism 311 and the filter mechanism 312, and the sewage is initially purified. And because the sewage in the first drain pipe 21 will be discharged into the sewage treatment plant for more process detection and treatment, it is only overflowed through the flow mechanism 311. The sewage in the second drain pipe 22 will be discharged into the nearby water body, so in addition to the overflow treatment, the sewage is also filtered through the filter plate 3123 for impurity treatment, so that the sewage will not cause water pollution after being discharged into the water body.

[0054] In one embodiment, the sewage treatment component 31 further includes an impurity treatment mechanism. The impurity treatment mechanism includes: a storage device 3131 and a delivery pipe 3132. The storage device 3131 stores flocculant inside, and the storage device 3131 is connected to the delivery pipe 3132. The delivery pipe 3132 is arranged in the flow mechanism 311, and the pipe section of the delivery pipe 3132 located in the flow slot 3111 is provided with a spray hole 3133.

[0055] The shape of the delivery pipe 3132 is similar to that of the flow mechanism 311, and is also stepped. The horizontal section of the delivery pipe 3132 is located at the bottom of the flow groove 3111, and the horizontal sections in two adjacent flow grooves 3111 are connected by a vertical section. In addition, the pipe section of the delivery pipe 3132 located in the flow groove 3111, that is, the horizontal section, is provided with a spray hole 3133, and a plurality of spray holes 3133 can be arranged along the outer wall of the delivery pipe 3132. The storage device 3131 is connected to the delivery pipe 3132 through an external pipeline to deliver flocculant to the delivery pipe 3132. A delivery pump and a one-way valve 3134 can be provided on the external pipeline, and the flocculant is pumped to the delivery pipe 3132 by the delivery pump, and the one-way valve 3134 can prevent the flocculant from flowing back.

[0056] The flocculant in the delivery pipe 3132 can be sprayed in the flow channel 3111 through the spray hole 3133, and the flocculant can purify the impurities in the sewage to form sludge, which settles to the bottom of the flow channel 3111. The impurity treatment mechanism is provided to further improve the purification effect of the sewage treatment component 31 on the sewage.

[0057] In one embodiment, the sewage treatment component 31 further includes a sludge treatment mechanism, which is mainly used to treat the sludge formed by the flocculant and impurities in the sludge to prevent the sludge from accumulating in the flow channel 3111 and affecting the flow of sewage.

[0058] In one embodiment, the sludge treatment mechanism includes: a sludge discharge trough 3141, a sludge conveying member 3142 and a sludge collecting trough 3143, the sludge discharge trough 3141 is located below the flow mechanism 311, the sludge collecting trough 3143 is located below the sludge discharge trough 3141 near one end of the drainage component, and the sludge conveying member 3142 is arranged in the sludge discharge trough 3141, and is used to transport the sludge in the sludge discharge trough 3141 to the sludge discharge trough 3141.

[0059] The sludge discharge trough 3141 is a relatively large trough, and the sludge in the flow trough 3111 can directly fall into the sludge discharge trough 3141. Specific implementation methods can install a gate on the bottom plate of the flow trough 3111 or make the bottom plate of the flow trough 3111 into two halves that can be flipped open, so that when sewage is discharged, sludge is continuously generated and accumulated in the flow trough 3111. After the sewage is discharged, the sludge can be directly discharged from the flow trough 3111 to the sludge discharge trough 3141 below. The sludge conveying member 3142 is used to collect all the sludge in the sludge discharge trough 3141 into the sludge collection tank 3143 for subsequent treatment. Specifically, the sludge conveying member 3142 includes: a motor 31421, a reducer 31422 and an auger 31423. The output shaft of the motor 31421 is connected to the reducer 31422, and the reducer 31422 is connected to the auger 31423. When the motor 31421 is started, the auger 31423 can be driven to rotate. The rotation of the auger 31423 can deliver the sludge to the sludge collection tank 3143.

[0060] In one embodiment, the sludge treatment mechanism further includes a sludge discharge member 3144 , which is connected to the sludge collection tank 3143 via a sludge transport pipe 3145 .

[0061] Specifically, the sludge discharge member 3144 is a centrifugal pump, which is connected to the sludge collection tank 3143 through a sludge transport pipe 3145. When the centrifugal pump is working, the sludge in the sludge collection tank 3143 can be pumped away. The sludge can be transported away by the centrifugal pump and can be made into fertilizer later. In this embodiment, multiple sludge collection tanks 3143 are connected through multiple sludge transport pipes 3145, and a centrifugal pump is used to discharge the sludge. In other embodiments, each sludge collection tank 3143 can also be equipped with a separate centrifugal pump.

[0062] The impurity treatment mechanism generates sludge when working, and settles at the bottom of the flow channel 3111. The sludge treatment mechanism can be set up to discharge the sludge and make use of it. The most important thing is to prevent the sludge from accumulating in the flow channel 3111 and affecting the flow of sewage.

[0063] In one embodiment, the combined sewerage treatment system further includes a power generation mechanism, which includes a water wheel 41 and a generator set 42. The water wheel 41 is disposed in the flow channel 3111, the water wheel 41 is connected to the generator set 42, and the generator set 42 is connected to the sludge conveying member 3142 and the sludge discharging member 3144.

[0064] The sewage entering the flow channel 3111 impacts the water wheel 41, which can drive the water wheel 41 to rotate, converting the kinetic energy and potential energy carried by the sewage into mechanical energy. The rotation of the water wheel 41 drives the generator set 42 to generate electricity, thereby converting the mechanical energy into electrical energy. The electrical energy generated by the generator set 42 can be supplied to various electrical equipment in the combined rainwater and sewage discharge treatment system. The system itself generates electrical energy for electrical equipment, and no additional power supply is required.

[0065] The working process of the combined rainwater and sewage discharge treatment system provided in this embodiment is described as follows:

[0066] On rainy days, rainwater enters the rainwater and sewage confluence pipe 11 through the rainwater discharge pipe 12, and sewage enters the rainwater and sewage confluence pipe 11 through the sewage discharge pipe 13, and then enters the sewage treatment component 31 from the confluence pipe. Sewage flows into the flow groove 3111 and impacts the water wheel 41, and then the water wheel 41 rotates to drive the generator set 42 to generate electricity. Sewage continues to be discharged into the flow groove 3111 and gradually overflows to the next flow groove 3111 through the flow hole 3112, and overflows into the filter tank 3121 through the filter plate 3123. Sewage flows through each flow groove 3111 in turn, then enters the first discharge pipe through the first outlet pipe 23, and finally is discharged to the sewage treatment plant. Sewage flows through each filter tank 3121 in turn, then enters the second drain pipe 22 through the second outlet pipe 24, and finally is discharged to the water body. When the sewage is in the flow channel 3111 , the flocculant sprayed from the spray hole 3133 on the delivery pipe 3132 will convert the impurities in the sewage into sludge and settle at the bottom of the flow channel 3111 .

[0067] When the rainy weather ends, the sludge in the flow channel 3111 can be discharged into the sludge discharge channel 3141 below, and then the motor 31421 is started to drive the auger 31423 to rotate and transport the sludge to the sludge concentration tank 3143. The sludge in the sludge concentration tank 3143 is then discharged by a centrifugal pump and can be made into fertilizer later.

[0068] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A combined rainwater and sewage discharge treatment system, characterized in that: include: A water inlet assembly, the water inlet assembly comprising a rainwater and sewage manifold (11); A drainage component, the drainage component comprising: a first drainage pipe (21) and a second drainage pipe (22), the first drainage pipe (21) being connected to a sewage treatment plant, and the second drainage pipe (22) being connected to a water body; A sewage treatment device, wherein the water inlet side of the sewage treatment device is connected to the rainwater and sewage confluence pipe (11), and the water outlet side is connected to the first drainage pipe (21) and the second drainage pipe (22).

2. The combined rainwater and sewage drainage treatment system according to claim 1 is characterized in that: The sewage treatment device comprises a plurality of sewage treatment components (31) arranged at intervals along the sewage flow direction in the rainwater and sewage confluence pipe (11).

3. The combined rainwater and sewage discharge treatment system according to claim 2 is characterized in that: The sewage treatment component (31) comprises: a flow mechanism (311) and a filter mechanism (312); the flow mechanism (311) is provided on at least one side of the filter mechanism (312); the flow mechanism (311) is connected to the rainwater and sewage confluence pipe (11) and the first drainage pipe (21); and the filter mechanism (312) is connected to the flow mechanism (311) and the second drainage pipe (22).

4. The combined rainwater and sewage drainage treatment system according to claim 3 is characterized in that: The flow mechanism (311) comprises a plurality of flow grooves (3111) arranged in a step-by-step manner from high to low along the water inlet side to the water outlet side of the sewage treatment device, and adjacent flow grooves (3111) are connected via flow holes (3112); the filtering mechanism (312) comprises a plurality of filter grooves (3121) arranged in a step-by-step manner from high to low along the water inlet side to the water outlet side of the sewage treatment device, and adjacent filter grooves (3121) are connected via filter holes (3122), and the flow grooves (3111) are correspondingly connected to the filter grooves (3121), and a filter plate (3123) is provided at the connection.

5. The rainwater and sewage combined drainage treatment system according to claim 4 is characterized in that: The sewage treatment component (31) also includes an impurity treatment mechanism, which includes: a storage device (3131) and a delivery pipe (3132), wherein the storage device (3131) stores flocculant inside, and the storage device (3131) is connected to the delivery pipe (3132), the delivery pipe (3132) is arranged in the flow mechanism (311), and the pipe section of the delivery pipe (3132) located in the flow groove (3111) is provided with a spray hole (3133).

6. The combined rainwater and sewage drainage treatment system according to claim 5, characterized in that: The sewage treatment component (31) also includes a sludge treatment mechanism.

7. The combined rainwater and sewage drainage treatment system according to claim 6, characterized in that: The sludge treatment mechanism comprises: a sludge discharge trough (3141), a sludge conveying member (3142) and a sludge collecting trough (3143); the sludge discharge trough (3141) is located below the flow-through mechanism (311); the sludge collecting trough (3143) is located below the sludge discharge trough (3141) near one end of the drainage component; the sludge conveying member (3142) is arranged in the sludge discharge trough (3141) and is used to transport the sludge in the sludge discharge trough (3141) to the sludge discharge trough (3141).

8. The combined rainwater and sewage drainage treatment system according to claim 7, characterized in that: The sludge treatment mechanism also includes a sludge discharge member (3144), and the sludge discharge member (3144) is connected to the sludge concentration tank (3143) through a sludge transport pipe (3145).

9. The rainwater-sewage combined drainage treatment system according to claim 8, characterized in that: It also includes a power generation mechanism, which includes a water wheel (41) and a generator set (42), wherein the water wheel (41) is arranged in the flow channel (3111), the water wheel (41) is connected to the generator set (42), and the generator set (42) is connected to the sludge conveying member (3142) and the sludge discharging member (3144).

10. The rainwater-sewage combined drainage treatment system according to any one of claims 1 to 9, characterized in that: The water inlet assembly further comprises: a rainwater discharge pipe (12) and a sewage discharge pipe (13), wherein the rainwater discharge pipe (12) and the sewage discharge pipe (13) are connected to the rainwater and sewage confluence pipe (11).

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