Multi-flocculation and sedimentation treatment device for sewage

Abstract

The application provides a multiple flocculation and sedimentation treatment device for sewage, which comprises a mixing unit, a first flocculation unit and a second flocculation unit. The mixing unit is provided with a plurality of mixing units, and each mixing unit can respectively stir the sewage and the flocculant entering the mixing cavity through the feeding port. The first flocculation unit has a first flocculation cavity communicated with the discharge port of each mixing unit. The first flocculation unit can receive the mixture of the sewage and the flocculant, and make the sewage and the flocculant mix again and sediment. The second flocculation unit has a second flocculation cavity communicated with the overflow port of the first flocculation unit, and the second flocculation unit can receive the upper layer sewage transferred from the first flocculation unit, and make the sewage sediment again through the negative pressure of the second flocculation cavity. The multiple flocculation and sedimentation treatment device for sewage can effectively ensure the sufficient mixing of the sewage and the flocculant, sufficient flocculation time, and the flocculation effect.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment equipment, specifically relating to a multi-stage flocculation and sedimentation treatment device for wastewater. Background Technology

[0002] Wastewater treatment employs flocculation purification, primarily removing suspended solids, colloidal substances, and some dissolved substances from water through flocculation and sedimentation. This process involves adding flocculants to wastewater, causing solid impurities to coagulate and settle. After adding flocculants, the colloidal and dispersed particles of suspended solids form flocs under the interaction of molecular forces. These flocs collide and agglomerate during sedimentation, continuously increasing in size and mass, and increasing the settling velocity, thus achieving solid-liquid separation.

[0003] In the existing technology, the flocculation purification process of sewage is usually carried out in a flocculation purification device. In order to improve the flocculation effect, simple stirring is usually used to make the flocculant and the settled impurities come into full contact. This method has low efficiency in promoting the mixing of sewage and flocculant, poor flocculation effect, and poor practicality. Summary of the Invention

[0004] This invention provides a multi-stage flocculation and sedimentation treatment device for wastewater, which aims to solve the problem of poor usability caused by the poor flocculation and purification effect of existing flocculation purification devices.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a multi-stage flocculation and sedimentation treatment device for wastewater, comprising:

[0006] The mixing unit comprises multiple units, each having a mixing chamber, a feed inlet and a discharge outlet communicating with the mixing chamber; each mixing unit is used to stir the wastewater and flocculant entering the mixing chamber through the feed inlet respectively.

[0007] The first flocculation unit has a first flocculation chamber connected to the discharge outlet of each of the mixing units, and the first flocculation unit has an overflow outlet at the top; the first flocculation unit is used to receive a mixture of sewage and flocculant, while simultaneously remixing the sewage and flocculant and allowing them to settle.

[0008] The second flocculation unit has a second flocculation chamber that is connected to the overflow port of the first flocculation unit. The second flocculation unit is used to receive the upper layer of sewage from the first flocculation unit and to make the sewage settle again by means of negative pressure in the second flocculation chamber.

[0009] In one possible implementation, each of the hybrid units includes:

[0010] A vertical mixing tank, the tank cavity being the mixing chamber; the feeding port is located at the top of the vertical mixing tank, and the discharge port is located at the bottom of the vertical mixing tank;

[0011] A stirring structure is provided on the vertical stirring tank for stirring the sewage and flocculant in the mixing chamber.

[0012] In one possible implementation, the stirring structure includes:

[0013] A connecting shaft is arranged collinearly with the vertical central axis of the mixing chamber and is rotatably connected to the vertical mixing tank. The bottom end of the connecting shaft extends into the mixing chamber.

[0014] The stirring blades are located in the mixing chamber and are evenly distributed on the connecting shaft;

[0015] The driver is fixed at the top of the vertical mixing tank and is poweredly connected to the connecting shaft.

[0016] In one possible implementation, the first flocculation unit includes:

[0017] First support;

[0018] The first flocculation box is fixed on the first support, and the inner cavity of the first flocculation box is the first flocculation chamber; the bottom end of the first flocculation box is provided with a first drain outlet; the overflow outlet is located at the top of the first flocculation box.

[0019] A ventilation structure is fixed in the first flocculation box and has a ventilation section extending into the first flocculation chamber. The ventilation structure is used to inject high-pressure air into the wastewater in the first flocculation chamber.

[0020] An overflow structure is located at the top of the first flocculation chamber and fixed on the inner wall of the first flocculation chamber. The overflow structure has an open mouth that connects the first flocculation chamber and the overflow outlet respectively. The overflow structure is used to allow the upper layer of sewage after sedimentation in the first flocculation chamber to enter and to intercept large fixed particles in the sewage so that the sewage carrying small fixed particles is discharged from the overflow outlet.

[0021] In one possible implementation, the ventilation structure includes:

[0022] An air pump is fixedly mounted on the first flocculation box;

[0023] A vent pipe is installed vertically on the first flocculation box. The top end of the vent pipe is connected to the air outlet of the air pump, and the bottom end is the venting section.

[0024] The partition cylinder is coaxially sleeved outside the vent pipe, forming an annular space with an open bottom with the vent pipe. The bottom of the partition cylinder is at a higher height than the bottom of the vent pipe.

[0025] In one possible implementation, the overflow structure includes:

[0026] The base plate is horizontally positioned and located below the overflow outlet;

[0027] The side plate is provided in two parts, which are located on both sides of the overflow outlet in a horizontal direction and are connected to the bottom plate.

[0028] The filter plate is connected to the bottom plate and the two side plates respectively, so as to form an open mouth with an open top in the first flocculation chamber;

[0029] Two floats are provided, which are respectively arranged on both sides of the filter plate in a vertical direction and connected to the side wall of the first flocculation chamber by elastic ropes.

[0030] A scraper, horizontally positioned and connected to the two floats, is used to follow the vertical movement of the floats to clean the particles attached to the filter plate.

[0031] In one possible implementation, the wastewater multi-flocculation sedimentation treatment device further includes a mounting frame for mounting each of the mixing units;

[0032] The height of each of the mixing chambers is higher than the height of the first flocculation chamber.

[0033] In one possible implementation, the second flocculation unit includes:

[0034] The second support has a maintenance platform;

[0035] The second flocculation box is fixed on the second support, and the inner cavity of the second flocculation box is the second flocculation chamber. The second flocculation chamber is provided with a plurality of vertically arranged partition plates, each partition plate dividing the second flocculation chamber into a plurality of sub-cavities with interconnected tops. The sub-cavity located at one end is connected to the overflow port, and the bottom end of the sub-cavity located at the other end is connected to the discharge port. The bottom end of the second flocculation box is provided with a plurality of second sewage outlets that are connected to each of the sub-cavities.

[0036] A vacuum pump is fixed on the second flocculation box and connected to an exhaust port located at the top of the second flocculation box, used to apply negative pressure to the second flocculation box.

[0037] In this implementation, multiple mixing units can operate independently, performing preliminary mixing of the added wastewater and flocculant to ensure improved mixing efficiency. The pre-mixed wastewater and flocculant mixture then enters the first flocculation chamber of the first flocculation unit. This first flocculation unit further mixes the wastewater and flocculant, enhancing the treatment effect and allowing fixed particles in the wastewater to settle. The upper layer of wastewater overflows into the second flocculation unit for further settling. This multi-stage wastewater treatment effectively ensures thorough mixing of wastewater and flocculant, sufficient flocculation time, and guaranteed flocculation results. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the wastewater multi-stage flocculation and sedimentation treatment device provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the main structure of a wastewater multi-flocculation sedimentation treatment device provided in an embodiment of the present invention;

[0040] Figure 3 A top view of the wastewater multi-flocculation sedimentation treatment device provided in an embodiment of the present invention;

[0041] Figure 4 This is a cross-sectional structural schematic diagram of a wastewater multi-flocculation sedimentation treatment device provided in an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the structure of the first flocculation unit of the wastewater multi-flocculation sedimentation treatment device provided in an embodiment of the present invention;

[0043] Figure 6 A schematic diagram of the overflow structure in the first flocculation unit of the wastewater multi-flocculation sedimentation treatment device provided in an embodiment of the present invention;

[0044] Figure 7 A schematic diagram of the mixing unit structure of the wastewater multi-flocculation sedimentation treatment device provided in an embodiment of the present invention;

[0045] Explanation of reference numerals in the attached figures:

[0046] 10. Mixing unit; 11. Vertical mixing tank; 12. Mixing structure; 121. Connecting shaft; 122. Mixing blades; 123. Driver;

[0047] 20. First flocculation unit; 21. First support frame; 22. First flocculation box; 23. Ventilation structure; 231. Air pump; 232. Ventilation pipe; 233. Partition cylinder; 24. Overflow structure; 241. Bottom plate; 242. Side plate; 243. Filter plate; 244. Float; 245. Scraper; 25. First flocculation chamber;

[0048] 30. Second flocculation unit; 31. Second support frame; 32. Second flocculation box; 33. Divider plate; 34. Vacuum pump;

[0049] 40. Mounting bracket. Detailed Implementation

[0050] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0051] Please refer to the following: Figures 1 to 4 The present invention will now describe the wastewater multi-stage flocculation and sedimentation treatment device. The wastewater multi-stage flocculation and sedimentation treatment device includes a mixing unit 10, a first flocculation unit 20, and a second flocculation unit 30. Multiple mixing units 10 are provided, each having a mixing chamber, a feed inlet, and a discharge outlet communicating with the mixing chamber. Each mixing unit 10 can respectively stir the wastewater and flocculant entering the mixing chamber through the feed inlet. The first flocculation unit 20 has a first flocculation chamber 25 communicating with the discharge outlet of each mixing unit 10, and an overflow outlet at the top of the first flocculation unit 20. The first flocculation unit 20 can receive the mixture of wastewater and flocculant, and simultaneously remix the wastewater and flocculant for sedimentation. The second flocculation unit 30 has a second flocculation chamber communicating with the overflow outlet of the first flocculation unit 20. The second flocculation unit 30 can receive the upper layer of wastewater transferred from the first flocculation unit 20, and cause the wastewater to settle again through negative pressure in the second flocculation chamber.

[0052] The wastewater multi-stage flocculation and sedimentation treatment device provided in this embodiment, compared with the prior art, allows multiple mixing units 10 to operate independently, performing preliminary stirring and mixing of the added wastewater and flocculant, thus ensuring improved mixing efficiency. The pre-mixed wastewater and flocculant mixture then enters the first flocculation chamber 25 of the first flocculation unit 20, where further mixing of the wastewater and flocculant enhances the treatment effect. Simultaneously, it allows fixed particles in the wastewater to settle, with the upper layer of wastewater overflowing into the second flocculation unit 30 for further sedimentation. This multi-stage wastewater treatment effectively ensures thorough mixing of wastewater and flocculant, sufficient flocculation time, and guaranteed flocculation effect.

[0053] It should be noted that wastewater may contain particulate matter, including suspended particles and colloids, which can be coagulated by flocculants to form larger fixed particles.

[0054] In some embodiments, the mixing unit 10 described above may employ, as follows: Figure 7 The structure shown. See also Figure 7 Each mixing unit 10 includes a vertical mixing tank 11 and a mixing structure 12. The chamber of the vertical mixing tank 11 is a mixing chamber. The feed inlet is located at the top of the vertical mixing tank 11, and the discharge outlet is located at the bottom of the vertical mixing tank 11. The mixing structure 12 is installed on the vertical mixing tank 11 and can mix the sewage and flocculant in the mixing chamber.

[0055] The vertical mixing tank 11 ensures the addition of wastewater and flocculant, while the mixing structure 12 ensures the mixing of the added wastewater and flocculant, thereby ensuring the initial coagulation of particulate matter in the wastewater and guaranteeing the wastewater treatment effect at the front end.

[0056] In some embodiments, the stirring structure 12 described above can be as follows: Figure 4 The structure shown. See also Figure 4 The stirring structure 12 includes a connecting shaft 121, stirring blades 122, and a driver 123. The connecting shaft 121 is collinear with the vertical axis of the mixing chamber and is rotatably connected to the vertical mixing tank 11. The bottom end of the connecting shaft 121 extends into the mixing chamber. The stirring blades 122 are located in the mixing chamber and are evenly distributed on the connecting shaft 121. The driver 123 is fixed to the top of the vertical mixing tank 11 and is poweredly connected to the connecting shaft 121.

[0057] The stirring structure 12 is simple in structure, easy to manufacture, and can also ensure the mixing effect.

[0058] In some embodiments, the first flocculation unit 20 described above may employ, for example... Figure 5 The structure shown. See also Figure 5 The first flocculation unit 20 includes a first support 21, a first flocculation box 22, a ventilation structure 23, and an overflow structure 24. The first flocculation box 22 is fixed to the first support 21, and its inner cavity is a first flocculation chamber 25. A first drain outlet is located at the bottom of the first flocculation box 22. The overflow outlet is located at the top of the first flocculation box 22. The ventilation structure 23 is fixed to the first flocculation box 22 and has a ventilation section extending into the first flocculation chamber 25, allowing high-pressure air to be injected into the wastewater within the first flocculation chamber 25. The overflow structure 24 is located at the top of the first flocculation chamber 25 and is fixed to the inner wall of the first flocculation chamber 25. The overflow structure 24 has an open cavity that connects to both the first flocculation chamber 25 and the overflow outlet. The overflow structure 24 allows the upper layer of wastewater after sedimentation in the first flocculation chamber 25 to enter and intercepts large fixed particles in the wastewater, allowing wastewater carrying small fixed particles to be discharged through the overflow outlet.

[0059] The first support 21 ensures the fixed installation of the first flocculation box 22, while the ventilation structure 23 allows high-pressure air to be introduced into the first flocculation chamber 25. Through the action of the air, bubbles are formed in the wastewater, and these bubbles quickly disperse, aiding in coarse shear flotation and bubble flocculation, thus improving the removal efficiency of solid particles. Furthermore, the bubbles tumble in the wastewater after ventilation, further agitating it and ensuring a better mixing effect. The overflow structure 24 intercepts large solid particles in the first flocculation chamber 25 while ensuring that the upper wastewater enters the open cavity and then flows out through the overflow outlet.

[0060] It should be noted that the first flocculation box 22 can be a rectangular structure at the top and a pyramidal funnel structure at the bottom, with the first sewage outlet located at the bottom to ensure the discharge of settled particles.

[0061] In some embodiments, the ventilation structure 23 described above can be as follows: Figure 4 The structure shown. See also Figure 4 The ventilation structure 23 includes an air pump 231, a ventilation pipe 232, and a partition cylinder 233. The air pump 231 is fixed on the first flocculation box 22. The ventilation pipe 232 is vertically arranged on the first flocculation box 22, with its top end connected to the air outlet of the air pump 231 and its bottom end serving as the ventilation section. The partition cylinder 233 is coaxially sleeved around the outside of the ventilation pipe 232, forming an annular space with an open bottom. The bottom of the partition cylinder 233 is at a higher height than the bottom of the ventilation pipe 232.

[0062] The air pump 231 and the air pipe 232 ensure that air is supplied to the first flocculation chamber 25. The partition cylinder 233, when air enters the sewage outlet, forms bubbles that rise into the annular space. Under the action of air pressure, the bubbles will move laterally to the outer edge of the bottom of the partition cylinder 233 and rise again. This increases the lateral movement distance of the bubbles in the sewage, thereby increasing the agitation range of the sewage and ensuring the agitation effect.

[0063] In some embodiments, the overflow structure 24 described above can be adopted as follows: Figure 6 The structure shown. See also Figure 6The overflow structure 24 includes a bottom plate 241, side plates 242, a filter plate 243, floats 244, and a scraper 245. The bottom plate 241 is horizontally positioned below the overflow outlet. Two side plates 242 are provided, positioned horizontally on either side of the overflow outlet and connected to the bottom plate 241. The filter plate 243 is connected to the bottom plate 241 and the two side plates 242, forming an open cavity with an open top within the first flocculation chamber 25. Two floats 244 are provided, positioned vertically on either side of the filter plate 243 and connected to the sidewall of the first flocculation chamber 25 via elastic ropes. The scraper 245 is horizontally positioned and connected to the two floats 244, moving vertically with the floats 244 to clean particles adhering to the filter plate 243.

[0064] In some embodiments, see Figure 1 The wastewater multi-stage flocculation and sedimentation treatment device also includes mounting brackets 40 for installing each mixing unit 10. The height of each mixing chamber is higher than the height of the first flocculation chamber 25. This structure ensures that the wastewater in the mixing chamber can enter the first flocculation chamber 25 by gravity alone.

[0065] It should be noted that each vertical mixing tank 11 has a drain outlet connected to a drain pipe, each drain pipe is equipped with a valve, and the end of each drain pipe is connected to a main connecting pipe, which is connected to the first flocculation unit 20.

[0066] In some embodiments, the second flocculation unit 30 described above may employ, for example... Figure 2 The structure shown. See also Figure 2 The second flocculation unit 30 includes a second support 31, a second flocculation box 32, and a vacuum pump 34. The second support 31 has a maintenance platform. The second flocculation box 32 is fixed on the second support 31, and its inner cavity is a second flocculation chamber. Multiple vertically arranged partition plates 33 are spaced apart in the second flocculation chamber, dividing it into multiple sub-cavities with interconnected tops. One sub-cavity is connected to an overflow port, and the bottom of the other sub-cavity is connected to a discharge port. The bottom of the second flocculation box 32 has multiple second drain ports connected to each sub-cavity. The vacuum pump 34 is fixed on the second flocculation box 32 and connected to an exhaust port located at the top of the second flocculation box 32, enabling it to apply negative pressure to the second flocculation box 32.

[0067] Wastewater entering one end of the sub-chamber of the second flocculation tank 32 will have its level rise. When the level rises to the height of the partition plate 33, it will flow into the adjacent sub-chamber, and so on, with the wastewater entering each sub-chamber separately. Multiple sedimentation and flocculation can effectively remove indicators such as color, turbidity, and suspended solids from the water, making the final effluent clearer and more transparent. Multiple sedimentation and flocculation can also effectively remove some heavy metals and organic pollutants from the water, reducing the pollution load in the final effluent. By setting multiple sub-chambers in the second flocculation tank and utilizing the sedimentation phenomenon of sediment settling and water rising, the treatment time of each sedimentation and flocculation can be shortened, reducing the overall wastewater treatment time and improving the treatment capacity.

[0068] In addition, the vacuum pump 34 can evacuate the second flocculation chamber. Through the operation of the vacuum pump 34, the top of the second flocculation chamber is in a negative pressure state, which means that air is injected into the wastewater in the second flocculation chamber. At this time, the gas in the wastewater will be drawn out and then released into the wastewater. The bubbles formed in the wastewater will quickly disperse in the wastewater, which helps coarse shear flotation and bubble flocculation, further improving the removal efficiency of solid particles.

[0069] It should be noted that multiple vacuum pumps 34 can be provided to ensure the efficiency and effectiveness of vacuuming.

[0070] Specifically, the wastewater multiple flocculation sedimentation treatment device provided in this embodiment removes most of the larger particles and suspended solids by sedimentation and flocculation in the first flocculation chamber 25. Subsequently, multiple sedimentation and flocculation in the second flocculation chamber can further remove finer particles and suspended solids, as well as residual flocculant. Furthermore, multiple sedimentation and flocculation can effectively remove colloidal substances in the water.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater treatment device using multiple flocculation and sedimentation processes, characterized in that, include: The mixing unit is provided in multiple ways, each mixing unit has a mixing chamber, and each mixing unit has a feeding port and a discharge port communicating with the mixing chamber; Each of the mixing units is used to stir the wastewater and flocculant that enter the mixing chamber through the feeding port; The first flocculation unit has a first flocculation chamber communicating with the outlets of each of the mixing units, and an overflow outlet at the top of the first flocculation unit. The first flocculation unit is used to receive a mixture of wastewater and flocculant, while simultaneously remixing and settling the wastewater and flocculant. The first flocculation unit includes a first support, a first flocculation box, a ventilation structure, and an overflow structure. The first flocculation box is fixed to the first support, and its inner cavity is the first flocculation chamber. A first drain outlet is provided at the bottom of the first flocculation box. The overflow outlet is located at the top of the first flocculation box. The ventilation structure is fixed in the first flocculation box and has a ventilation section extending into the first flocculation chamber. The ventilation structure is used to inject high-pressure air into the wastewater in the first flocculation chamber. The overflow structure is located at the top of the first flocculation chamber and fixed to the inner wall of the first flocculation chamber. The overflow structure has connections to the outlets of each mixing unit. The first flocculation chamber and the overflow outlet have an open cavity; the overflow structure is used to allow the upper layer of sewage after sedimentation in the first flocculation chamber to enter, and to intercept large solid particles in the sewage so that the sewage carrying small solid particles can be discharged from the overflow outlet; the ventilation structure includes an air pump, a ventilation pipe, and a partition cylinder; the air pump is fixed on the first flocculation chamber; the ventilation pipe is arranged vertically on the first flocculation chamber, the top end of the ventilation pipe is connected to the air outlet of the air pump, and the bottom end is the ventilation part; the partition cylinder is coaxially sleeved on the outside of the ventilation pipe, and the partition cylinder and the ventilation pipe enclose an annular space with an open bottom. The arrangement of the air pump and the ventilation pipe can introduce air into the first flocculation chamber, forming bubbles that rise into the annular space. Under the action of air pressure, the bubbles will move laterally to the outer edge of the bottom end of the partition cylinder and rise again. The height of the bottom end of the partition cylinder is higher than the height of the bottom end of the ventilation pipe. The second flocculation unit has a second flocculation chamber connected to the overflow port of the first flocculation unit. The second flocculation unit is used to receive the upper layer of sewage transferred from the first flocculation unit and to make the sewage settle again by creating a negative pressure in the second flocculation chamber. The second flocculation unit includes a second flocculation box and a vacuum pump. The inner cavity of the second flocculation box is the second flocculation chamber. The vacuum pump is fixed on the second flocculation box and connected to the exhaust port provided at the top of the second flocculation box, and is used to create a negative pressure in the second flocculation box.

2. The wastewater treatment device with multiple flocculation and sedimentation as described in claim 1, characterized in that, Each of the hybrid units includes: A vertical mixing tank, the tank cavity being the mixing chamber; the feeding port is located at the top of the vertical mixing tank, and the discharge port is located at the bottom of the vertical mixing tank; A stirring structure is provided on the vertical stirring tank for stirring the sewage and flocculant in the mixing chamber.

3. The wastewater treatment device with multiple flocculation and sedimentation as described in claim 2, characterized in that, The stirring structure includes: A connecting shaft is arranged collinearly with the vertical central axis of the mixing chamber and rotatably connected to the vertical stirring tank. The bottom end of the connecting shaft extends into the mixing chamber. The stirring blades are located in the mixing chamber and are evenly distributed on the connecting shaft; The driver is fixed at the top of the vertical mixing tank and is poweredly connected to the connecting shaft.

4. The wastewater treatment device with multiple flocculation and sedimentation as described in claim 1, characterized in that, The overflow structure includes: The base plate is horizontally positioned and located below the overflow outlet; The side plate is provided in two parts, which are located on both sides of the overflow outlet in a horizontal direction and are connected to the bottom plate. The filter plate is connected to the bottom plate and the two side plates respectively, so as to form an open mouth with an open top in the first flocculation chamber; Two floats are provided, which are respectively arranged on both sides of the filter plate in a vertical direction and connected to the side wall of the first flocculation chamber by elastic ropes. A scraper, horizontally positioned and connected to the two floats, is used to follow the vertical movement of the floats to clean the particles attached to the filter plate.

5. The wastewater treatment device with multiple flocculation and sedimentation as described in claim 1, characterized in that, The wastewater multi-stage flocculation sedimentation treatment device also includes a mounting frame for installing each of the mixing units; The height of each of the mixing chambers is higher than the height of the first flocculation chamber.

6. The wastewater treatment device with multiple flocculation and sedimentation as described in claim 1, characterized in that, The second flocculation unit includes: The second support has a maintenance platform; The second flocculation box is fixed on the second support; the second flocculation chamber is provided with a plurality of partition plates arranged vertically at intervals, and each partition plate divides the second flocculation chamber into a plurality of sub-cavities with interconnected tops; the sub-cavity located at one end is connected to the overflow port, and the bottom end of the sub-cavity located at the other end is connected to the discharge port; the bottom end of the second flocculation box is provided with a plurality of second sewage outlets connected to each of the sub-cavities.

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